full removal of SDL

dropping `SDL2` requirement, opting for `glfw3` instead.

lib/glad/include/KHR/khrplatform.h

@@ -0,0 +1,311 @@
+#ifndef __khrplatform_h_
+#define __khrplatform_h_
+
+/*
+** Copyright (c) 2008-2018 The Khronos Group Inc.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a
+** copy of this software and/or associated documentation files (the
+** "Materials"), to deal in the Materials without restriction, including
+** without limitation the rights to use, copy, modify, merge, publish,
+** distribute, sublicense, and/or sell copies of the Materials, and to
+** permit persons to whom the Materials are furnished to do so, subject to
+** the following conditions:
+**
+** The above copyright notice and this permission notice shall be included
+** in all copies or substantial portions of the Materials.
+**
+** THE MATERIALS ARE PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+** EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+** MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+** IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+** CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+** MATERIALS OR THE USE OR OTHER DEALINGS IN THE MATERIALS.
+*/
+
+/* Khronos platform-specific types and definitions.
+ *
+ * The master copy of khrplatform.h is maintained in the Khronos EGL
+ * Registry repository at https://github.com/KhronosGroup/EGL-Registry
+ * The last semantic modification to khrplatform.h was at commit ID:
+ *      67a3e0864c2d75ea5287b9f3d2eb74a745936692
+ *
+ * Adopters may modify this file to suit their platform. Adopters are
+ * encouraged to submit platform specific modifications to the Khronos
+ * group so that they can be included in future versions of this file.
+ * Please submit changes by filing pull requests or issues on
+ * the EGL Registry repository linked above.
+ *
+ *
+ * See the Implementer's Guidelines for information about where this file
+ * should be located on your system and for more details of its use:
+ *    http://www.khronos.org/registry/implementers_guide.pdf
+ *
+ * This file should be included as
+ *        #include <KHR/khrplatform.h>
+ * by Khronos client API header files that use its types and defines.
+ *
+ * The types in khrplatform.h should only be used to define API-specific types.
+ *
+ * Types defined in khrplatform.h:
+ *    khronos_int8_t              signed   8  bit
+ *    khronos_uint8_t             unsigned 8  bit
+ *    khronos_int16_t             signed   16 bit
+ *    khronos_uint16_t            unsigned 16 bit
+ *    khronos_int32_t             signed   32 bit
+ *    khronos_uint32_t            unsigned 32 bit
+ *    khronos_int64_t             signed   64 bit
+ *    khronos_uint64_t            unsigned 64 bit
+ *    khronos_intptr_t            signed   same number of bits as a pointer
+ *    khronos_uintptr_t           unsigned same number of bits as a pointer
+ *    khronos_ssize_t             signed   size
+ *    khronos_usize_t             unsigned size
+ *    khronos_float_t             signed   32 bit floating point
+ *    khronos_time_ns_t           unsigned 64 bit time in nanoseconds
+ *    khronos_utime_nanoseconds_t unsigned time interval or absolute time in
+ *                                         nanoseconds
+ *    khronos_stime_nanoseconds_t signed time interval in nanoseconds
+ *    khronos_boolean_enum_t      enumerated boolean type. This should
+ *      only be used as a base type when a client API's boolean type is
+ *      an enum. Client APIs which use an integer or other type for
+ *      booleans cannot use this as the base type for their boolean.
+ *
+ * Tokens defined in khrplatform.h:
+ *
+ *    KHRONOS_FALSE, KHRONOS_TRUE Enumerated boolean false/true values.
+ *
+ *    KHRONOS_SUPPORT_INT64 is 1 if 64 bit integers are supported; otherwise 0.
+ *    KHRONOS_SUPPORT_FLOAT is 1 if floats are supported; otherwise 0.
+ *
+ * Calling convention macros defined in this file:
+ *    KHRONOS_APICALL
+ *    KHRONOS_APIENTRY
+ *    KHRONOS_APIATTRIBUTES
+ *
+ * These may be used in function prototypes as:
+ *
+ *      KHRONOS_APICALL void KHRONOS_APIENTRY funcname(
+ *                                  int arg1,
+ *                                  int arg2) KHRONOS_APIATTRIBUTES;
+ */
+
+#if defined(__SCITECH_SNAP__) && !defined(KHRONOS_STATIC)
+#   define KHRONOS_STATIC 1
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APICALL
+ *-------------------------------------------------------------------------
+ * This precedes the return type of the function in the function prototype.
+ */
+#if defined(KHRONOS_STATIC)
+    /* If the preprocessor constant KHRONOS_STATIC is defined, make the
+     * header compatible with static linking. */
+#   define KHRONOS_APICALL
+#elif defined(_WIN32)
+#   define KHRONOS_APICALL __declspec(dllimport)
+#elif defined (__SYMBIAN32__)
+#   define KHRONOS_APICALL IMPORT_C
+#elif defined(__ANDROID__)
+#   define KHRONOS_APICALL __attribute__((visibility("default")))
+#else
+#   define KHRONOS_APICALL
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIENTRY
+ *-------------------------------------------------------------------------
+ * This follows the return type of the function  and precedes the function
+ * name in the function prototype.
+ */
+#if defined(_WIN32) && !defined(_WIN32_WCE) && !defined(__SCITECH_SNAP__)
+    /* Win32 but not WinCE */
+#   define KHRONOS_APIENTRY __stdcall
+#else
+#   define KHRONOS_APIENTRY
+#endif
+
+/*-------------------------------------------------------------------------
+ * Definition of KHRONOS_APIATTRIBUTES
+ *-------------------------------------------------------------------------
+ * This follows the closing parenthesis of the function prototype arguments.
+ */
+#if defined (__ARMCC_2__)
+#define KHRONOS_APIATTRIBUTES __softfp
+#else
+#define KHRONOS_APIATTRIBUTES
+#endif
+
+/*-------------------------------------------------------------------------
+ * basic type definitions
+ *-----------------------------------------------------------------------*/
+#if (defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || defined(__GNUC__) || defined(__SCO__) || defined(__USLC__)
+
+
+/*
+ * Using <stdint.h>
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+/*
+ * To support platform where unsigned long cannot be used interchangeably with
+ * inptr_t (e.g. CHERI-extended ISAs), we can use the stdint.h intptr_t.
+ * Ideally, we could just use (u)intptr_t everywhere, but this could result in
+ * ABI breakage if khronos_uintptr_t is changed from unsigned long to
+ * unsigned long long or similar (this results in different C++ name mangling).
+ * To avoid changes for existing platforms, we restrict usage of intptr_t to
+ * platforms where the size of a pointer is larger than the size of long.
+ */
+#if defined(__SIZEOF_LONG__) && defined(__SIZEOF_POINTER__)
+#if __SIZEOF_POINTER__ > __SIZEOF_LONG__
+#define KHRONOS_USE_INTPTR_T
+#endif
+#endif
+
+#elif defined(__VMS ) || defined(__sgi)
+
+/*
+ * Using <inttypes.h>
+ */
+#include <inttypes.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(_WIN32) && !defined(__SCITECH_SNAP__)
+
+/*
+ * Win32
+ */
+typedef __int32                 khronos_int32_t;
+typedef unsigned __int32        khronos_uint32_t;
+typedef __int64                 khronos_int64_t;
+typedef unsigned __int64        khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif defined(__sun__) || defined(__digital__)
+
+/*
+ * Sun or Digital
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#if defined(__arch64__) || defined(_LP64)
+typedef long int                khronos_int64_t;
+typedef unsigned long int       khronos_uint64_t;
+#else
+typedef long long int           khronos_int64_t;
+typedef unsigned long long int  khronos_uint64_t;
+#endif /* __arch64__ */
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#elif 0
+
+/*
+ * Hypothetical platform with no float or int64 support
+ */
+typedef int                     khronos_int32_t;
+typedef unsigned int            khronos_uint32_t;
+#define KHRONOS_SUPPORT_INT64   0
+#define KHRONOS_SUPPORT_FLOAT   0
+
+#else
+
+/*
+ * Generic fallback
+ */
+#include <stdint.h>
+typedef int32_t                 khronos_int32_t;
+typedef uint32_t                khronos_uint32_t;
+typedef int64_t                 khronos_int64_t;
+typedef uint64_t                khronos_uint64_t;
+#define KHRONOS_SUPPORT_INT64   1
+#define KHRONOS_SUPPORT_FLOAT   1
+
+#endif
+
+
+/*
+ * Types that are (so far) the same on all platforms
+ */
+typedef signed   char          khronos_int8_t;
+typedef unsigned char          khronos_uint8_t;
+typedef signed   short int     khronos_int16_t;
+typedef unsigned short int     khronos_uint16_t;
+
+/*
+ * Types that differ between LLP64 and LP64 architectures - in LLP64,
+ * pointers are 64 bits, but 'long' is still 32 bits. Win64 appears
+ * to be the only LLP64 architecture in current use.
+ */
+#ifdef KHRONOS_USE_INTPTR_T
+typedef intptr_t               khronos_intptr_t;
+typedef uintptr_t              khronos_uintptr_t;
+#elif defined(_WIN64)
+typedef signed   long long int khronos_intptr_t;
+typedef unsigned long long int khronos_uintptr_t;
+#else
+typedef signed   long  int     khronos_intptr_t;
+typedef unsigned long  int     khronos_uintptr_t;
+#endif
+
+#if defined(_WIN64)
+typedef signed   long long int khronos_ssize_t;
+typedef unsigned long long int khronos_usize_t;
+#else
+typedef signed   long  int     khronos_ssize_t;
+typedef unsigned long  int     khronos_usize_t;
+#endif
+
+#if KHRONOS_SUPPORT_FLOAT
+/*
+ * Float type
+ */
+typedef          float         khronos_float_t;
+#endif
+
+#if KHRONOS_SUPPORT_INT64
+/* Time types
+ *
+ * These types can be used to represent a time interval in nanoseconds or
+ * an absolute Unadjusted System Time.  Unadjusted System Time is the number
+ * of nanoseconds since some arbitrary system event (e.g. since the last
+ * time the system booted).  The Unadjusted System Time is an unsigned
+ * 64 bit value that wraps back to 0 every 584 years.  Time intervals
+ * may be either signed or unsigned.
+ */
+typedef khronos_uint64_t       khronos_utime_nanoseconds_t;
+typedef khronos_int64_t        khronos_stime_nanoseconds_t;
+#endif
+
+/*
+ * Dummy value used to pad enum types to 32 bits.
+ */
+#ifndef KHRONOS_MAX_ENUM
+#define KHRONOS_MAX_ENUM 0x7FFFFFFF
+#endif
+
+/*
+ * Enumerated boolean type
+ *
+ * Values other than zero should be considered to be true.  Therefore
+ * comparisons should not be made against KHRONOS_TRUE.
+ */
+typedef enum {
+    KHRONOS_FALSE = 0,
+    KHRONOS_TRUE  = 1,
+    KHRONOS_BOOLEAN_ENUM_FORCE_SIZE = KHRONOS_MAX_ENUM
+} khronos_boolean_enum_t;
+
+#endif /* __khrplatform_h_ */

makefile

@@ -1,115 +1,86 @@
-# dependencies:
-#  - make
-#  - clang
-#  - bear (debug)
-#  - sdl2
-#  - git bash (windows)
-#
-# project name = the workspace directory name
-NAME := $(shell basename $(PWD))
-DEBUG ?= 0
-ARCH ?= 0
+SHELL = bash
+.SHELLFLAGS = -O globstar -c
+NAME    = tetris
+VERSION = 0.0.3
+DEBUG   ?= 0
+CC      ?= cc
+LD      ?= ld
+MARCH   ?= $(shell uname -m)
+KERNEL  ?= $(shell uname -s)
 
-# compiler settings
-CC := clang
-STD := c17
-CFLAGS := -m32 -Wall -Wextra -Wpedantic -Wno-pointer-arith
-LDFLAGS := -m32 -lm
+CFLAGS  += -c -std=gnu99 -Wall -Wextra -Wpedantic -MMD -MP
+LDFLAGS += -flto
 
-ifneq ($(DEBUG),0)
-CFLAGS  += -g -Og -fsanitize=address,undefined
-LDFLAGS += -fsanitize=address,undefined
-PROF    := dbg
+ifeq ($(KERNEL),)
+ISWIN := $(if $(filter $(OS),Windows_NT),1,0)
+ifeq ($(ISWIN),1)
+KERNEL = mingw
+MARCH  = x86_64
 else
-CFLAGS  += -DNDEBUG -O2 -Werror
-PROF    := rel
+MARCH  := $(shell uname -m)
+KERNEL := $(shell uname -s | tr '[:upper:]' '[:lower:]')
 endif
-
-ifneq ($(MAKECMDGOALS),clean)
-ifeq      ($(ARCH),linux-x86)
-CFLAGS  += -target x86_64-pc-linux-gnu $(shell pkg-config --cflags sdl2 SDL2_ttf)
-LDFLAGS += -target x86_64-pc-linux-gnu $(shell pkg-config --libs sdl2 SDL2_ttf)
-else ifeq ($(ARCH),win-x86)
-CFLAGS  += -target x86_64-pc-windows-gnu
-LDFLAGS += -target x86_64-pc-windows-gnu -fuse-ld=lld
-EXT     := .exe
 else
-$(error you must set the ARCH environment variable to one of these: 'linux-x86' 'win-x86')
+ISWIN := $(if $(filter $(KERNEL),mingw),1,0)
 endif
+ifeq ($(MARCH),)
+$(error must also set MARCH when manually setting KERNEL)
 endif
 
-ifneq ($(ARCH),0)
-# dirs
-DIR_BIN := bin/$(ARCH)/$(PROF)
-DIR_OBJ := obj/$(ARCH)/$(PROF)
-TARGET := $(DIR_BIN)/$(NAME)$(EXT)
-
-# source files
-SRC := $(wildcard src/*.c) $(wildcard src/**/*.c) $(wildcard src/**/**/*.c) $(wildcard src/**/**/**/*.c) $(wildcard src/**/**/**/**/*.c)
-OBJ := $(patsubst src/%,$(DIR_OBJ)/%,$(SRC:.c=.o))
-DEP := $(OBJ:.o=.d)
-SRC_ASSETS := $(wildcard assets/*)
-ASSETS := $(patsubst assets/%,$(DIR_BIN)/%,$(SRC_ASSETS))
-
-COMPILE_COMMANDS := $(DIR_OBJ)/compile_commands.json
+ifeq ($(DEBUG),1)
+PROF = dbg
+CFLAGS  += -UNDEBUG -Og -g -Wextra -Wpedantic
+CFLAGS  += $(if $(filter 1,$(ISWIN)),,-fsanitize=address,undefined) -ftrapv
+LDFLAGS += $(if $(filter 1,$(ISWIN)),,-fsanitize=address,undefined) -ftrapv
+else
+PROF = rel
+CFLAGS += -DNDEBUG -O3
 endif
 
-define wr_colour
-	@printf '\033[%sm%s\033[0m\n' $(2) $(1)
-endef
+CFLAGS  += $(shell pkg-config --cflags glfw3) -Ilib/glad/include
+LDFLAGS += $(shell pkg-config --libs glfw3) -lm
 
-# compiles and execute the binary
+SRC := $(shell echo src/**/*.c) lib/glad/src/gl.c
+RES := $(shell echo res/**.glsl)
+
+NAME += $(if $(filter 1,$(ISWIN)),.exe,)
+DIR_BIN := bin/$(MARCH)-$(KERNEL)/$(VERSION)/$(PROF)
+DIR_OBJ := obj/$(MARCH)-$(KERNEL)/$(VERSION)/$(PROF)
+
+BIN := $(DIR_BIN)/$(NAME)
+OBJ := $(SRC:%.c=$(DIR_OBJ)/%.o) $(RES:%=$(DIR_OBJ)/%.o)
+DEP := $(OBJ:%.o=%.d)
+
+.PHONY:
 run: compile
-	cd $(dir $(TARGET)) && ./$(notdir $(TARGET))
-compile: compile_commands $(TARGET) $(ASSETS)
+	$(BIN)
 
-.NOTPARALLEL:
+.PHONY:
+compile: $(BIN)
+
+.PHONY .NOTPARALLEL:
 clean:
-	rm -rf obj/ bin/ compile_commands.json
+	@[ -d obj/ ] && rm -rv obj/ || true
+	@[ -d bin/ ] && rm -rv bin/ || true
 
-# create the binary (linking step)
-$(TARGET): $(OBJ)
-	@$(call wr_colour,"CC: '$(CC)'",94)
-	@$(call wr_colour,"CFLAGS: '$(CFLAGS)'",94)
-	@$(call wr_colour,"LDFLAGS: '$(LDFLAGS)'",94)
-	@$(call wr_colour,"linking to: '$@'",92)
 
-	@mkdir -p ${@D}
-	@$(CC) -o $(TARGET) $^ $(LDFLAGS)
-	@$(call wr_colour,"current profile: '$(PROF)'",93)
+$(BIN): $(OBJ)
+	$(info [CC/LD] $@)
+	@mkdir -p $(@D)
+	@$(CC) -o $@ $^ $(LDFLAGS)
 
-# create .o and .d files
-$(DIR_OBJ)/%.o: src/%.c
-	@$(call wr_colour,"compiling $(notdir $@) from $(notdir $<)",92)
-	@mkdir -p ${@D}
-	@$(CC) $(CFLAGS) -c -MD -MP -std=$(STD) -x c -o $@ $<
+$(DIR_OBJ)/%.o: %.c
+	$(info [CC] $@)
+	@mkdir -p $(@D)
+	@$(CC) $(CFLAGS) -o $@ $<
 
-# copy assets
-$(DIR_BIN)/%: assets/%
-	@mkdir -p ${@D}
-	@cp -v $< $@
+$(DIR_OBJ)/res/%.o: res/%
+	$(info [LD] $@)
+	@mkdir -p $(@D)
+	@$(LD) -r -b binary -o $@ $<
 
-# update compile commands if the makefile has been updated (for linting)
-compile_commands: # default, empty rule
-ifneq ($(shell which bear),)
-ifneq ($(COMPILE_COMMANDS),)
-ifeq ($(NOCMDS),)
-.NOTPARALLEL .PHONY:
-compile_commands: $(COMPILE_COMMANDS)
-	@[ "$(readlink compile_commands.json)" != "$<" ] && ln -sf $< compile_commands.json
+.PHONY: x86_64-linux-gnu-gcc x86_64-w64-mingw32-gcc
+x86_64-linux-gnu-gcc:;   $(MAKE) $(CALL) $(MAKEFLAGS) CC=$@ MARCH=x86_64 KERNEL=linux
+x86_64-w64-mingw32-gcc:; $(MAKE) $(CALL) $(MAKEFLAGS) CC=$@ MARCH=x86_64 KERNEL=mingw
 
-.NOTPARALLEL:
-$(COMPILE_COMMANDS): makefile
-	@$(call wr_colour,"regenerating compile_commands.json thus recompiling.",93)
-	@mkdir -p ${@D} # ensure the target directory exists
-	@touch $@       # create the file so it isn't retriggered (will just change modification time if already exists)
-	@bear --output $@ -- make -B compile NOCMDS=1 # rebuild the current target using bear, to create the compile commands
-endif
-endif
-endif
-
-# disable implicit rules
-.SUFFIXES:
-
-# include the dependencies
 -include $(DEP)

res/sh.frag.glsl

@@ -0,0 +1 @@
+#version 330 core

res/sh.vert.glsl

@@ -0,0 +1 @@
+#version 330 core

src/error.h

@@ -1,50 +0,0 @@
-#pragma once
-
-#include <stdint.h>
-#include <stdnoreturn.h>
-
-/* defines statuses in the 0..127, any higher/negative values are POSIX-reserved.
- * The max value (or -1) shall mean the application is running, anything else shall mean an exit code of some kind */
-enum gamestatus {
-	// clang-format off
-	STATUS_SUCCESS = 0,                // 0; successful exit
-	STATUS_ERROR   = 1,                // miscellaneous error
-	ERROR_INIT     = STATUS_ERROR | 2, // initialisation error
-
-	ERROR_STD             = STATUS_ERROR   | 64, // standard library error
-	ERROR_STD_INIT        = ERROR_INIT     | 64, // standard library initialisation error
-	ERROR_STD_MEMORY      = ERROR_STD      | 32, // memory error
-	ERROR_STD_MEMORY_INIT = ERROR_STD_INIT | 32, // memory initialization error
-
-	ERROR_SDL                = STATUS_ERROR   | 32, // SDL error
-	ERROR_SDL_INIT           = ERROR_INIT     | 32, // SDL initialization error
-	ERROR_SDL_RENDERING      = ERROR_SDL      | 16, // rendering error
-	ERROR_SDL_RENDERING_INIT = ERROR_SDL_INIT | 16, // rendering initialization error
-	ERROR_SDL_AUDIO          = ERROR_SDL      | 8,  // audio error
-	ERROR_SDL_AUDIO_INIT     = ERROR_SDL_INIT | 8,  // audio initialization error
-	ERROR_SDL_FONT           = ERROR_SDL      | 4,  // font error
-	ERROR_SDL_FONT_INIT      = ERROR_SDL_INIT | 4,  // font initialization error
-
-	STATUS_RUNNING = -1,
-	// clang-format on
-};
-
-#if __INCLUDE_LEVEL__ > 0
-#include <SDL_messagebox.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-#include "util/macro.h"
-#endif
-
-#define debug(s, ...) printf("\033[95m" __FILE__ ":" MACRO_STR2(__LINE__) ": [DBG]: " s "\033[0m\n" __VA_OPT__(, __VA_ARGS__))
-#define info(s, ...)  printf(__FILE__ ":" MACRO_STR2(__LINE__) ": [INF]: " s "\n", __VA_OPT__(, __VA_ARGS__))
-#define warn(s, ...)  fprintf(stderr, "\033[93m" __FILE__ ":" MACRO_STR2(__LINE__) ": [WAR]: " s "\033[0m\n" __VA_OPT__(, __VA_ARGS__))
-#define error(s, ...) fprintf(stderr, "\033[91m" __FILE__ ":" MACRO_STR2(__LINE__) ": [ERR]: " s "\033[0m\n" __VA_OPT__(, __VA_ARGS__))
-
-#define fatal(c, s, ...)                                                                                                                \
-	do {                                                                                                                            \
-		printf("\033[101m" __FILE__ ":" MACRO_STR2(__LINE__) ": [FAT]: " s "\033[0m\n" __VA_OPT__(, __VA_ARGS__));              \
-		SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "something went wrong! :O", "view stderr for full details: \n" s, NULL); \
-		exit(c);                                                                                                                \
-	} while (0)

src/game/game.c

@@ -1,76 +0,0 @@
-#include "game.h"
-
-#include <stdbool.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-#include <time.h>
-
-#include "../io/colour/colour8.h"
-#include "../io/input.h"
-#include "../io/window.h"
-#include "../util/types.h"
-#include "../util/vec.h"
-#include "./tetromino/shapes.h"
-#include "tetromino/placing.h"
-#include "time.h"
-
-static colour8 rowdat[COLUMNS * ROWS] = {0}; // contains the raw data of the rows, in no particular order
-static struct gamedata dat = {0};
-
-/* shuffle an array using the Fisher–Yates shuffle algorithm.
- * `nmemb` is the number of members.
- * `membs` is the byte size of each member */
-static void shuffle(void *restrict ptr, size_t nmemb, size_t membs) {
-	u8 dat[membs];
-
-	for (size_t i = 0; i < nmemb; i++) {
-		size_t j = i + rand() % (nmemb - i);
-		void *ptri = (u8 *)ptr + i * membs;
-		void *ptrj = (u8 *)ptr + j * membs;
-		memcpy(dat, ptri, membs);
-		memcpy(ptri, ptrj, membs);
-		memcpy(ptrj, dat, membs);
-	}
-}
-
-void next_shape(void) {
-	// as long as we're not at the last shape, we can just increment
-	dat.pdat.sel = (i8vec2){COLUMNS / 2 - SHAPE_WIDTH / 2, 0};
-	dat.pdat.cur = dat.pdat.nxt[dat.pdat.idx];
-	dat.pdat.idx++;
-	if (dat.pdat.idx < TETC) return;
-
-	// shuffle all next shapes, preserving the last
-	dat.pdat.idx = 0;
-	shuffle(dat.pdat.nxt, TETC, sizeof(u8));
-}
-
-struct gamedata *game_init(void) {
-	srand(time(NULL));
-
-	// populate the data arrays
-	for (int i = 0; i < ROWS; i++)
-		dat.rows[i] = rowdat + i * COLUMNS;
-	for (int i = 0; i < TETC; i++)
-		dat.pdat.nxt[i] = i;
-
-	// initialise the placing data correctly
-	dat.pdat.sel = (i8vec2){COLUMNS / 2 - SHAPE_WIDTH / 2, 0};
-	shuffle(dat.pdat.nxt, TETC, sizeof(u8));
-	dat.pdat.cur = dat.pdat.nxt[dat.pdat.idx];
-	dat.pdat.idx++;
-	return &dat;
-}
-
-// called every time the game's state is updated
-void game_update(int movdat, size_t time) {
-	static time_t drop_timeout = 0;
-	movdat |= MOVD & -!!time_poll(time, 200, &drop_timeout);
-
-	if (place_update(&dat, movdat))
-		window_close();
-}
-
-void game_free(void) {
-}

src/game/game.h

@@ -1,43 +0,0 @@
-#pragma once
-#include <math.h>
-#include <stdbool.h>
-#include <stdint.h>
-#include <stdlib.h>
-
-#include "../io/colour/colour8.h"
-#include "../util/types.h"
-#include "../util/vec.h"
-#include "tetromino/shapes.h"
-
-// constants for pi(π) and tau(τ)
-#define PI   (M_PI)         // π constant
-#define TAU  (M_PI * 2.0)   // τ constant
-#define PIf  (M_PIf)        // π constant as a 32-bit floating point
-#define TAUf (M_PIf * 2.0F) // τ constant as a 32-bit floating point
-
-// stores the data used in the game
-#define COLUMNS 10
-#define ROWS    24
-
-/* contains the placement data */
-struct pdat {
-	u8 nxt[TETC]; // shuffled data representing the next shapes
-	i8vec2 sel;   // position of the current shape
-	u8 idx;       // the index of the current shape
-	u8 cur;       // the current id of the shape
-};
-
-/* contains game data that's commonly shared */
-struct gamedata {
-	struct pdat pdat;
-	colour8 *rows[ROWS];
-	u16 pnts;
-};
-
-
-/* increments to the next shape, shuffling the next shapes, if there isn't a next shape immediately after the current one. */
-void next_shape(void);
-
-struct gamedata *game_init(void);
-void game_update(int movdat, size_t time);
-void game_free(void);

src/game/tetromino/placing.c

@@ -1,95 +0,0 @@
-#include "placing.h"
-
-#include <stdint.h>
-#include <string.h>
-#include <sys/cdefs.h>
-
-#include "../../io/audio.h"
-#include "../../io/input.h"
-#include "../../util/types.h"
-#include "../../util/vec.h"
-#include "../game.h"
-#include "shapes.h"
-
-
-static int clear_rows(u8 *restrict *restrict rows) {
-	int count = 0;
-	u8 *cache[4]; /* the maximum amount of rows the user can clear at once is four */
-
-	for (int y = ROWS - 1; y >= 0; y--) {
-		int x = 0;
-		while (x < COLUMNS && rows[y][x] && count < 4) x++;
-		if (x >= COLUMNS) cache[count++] = rows[y];
-		else rows[y + count] = rows[y];
-	}
-
-	if (count) {
-		for (int i = 0; i < count; i++) {
-			memset(cache[i], 0, COLUMNS);
-			rows[i] = cache[i];
-		}
-	}
-	return count;
-}
-
-/* writes a shape to the screen */
-static void plcmnt_place(u8 *restrict const *restrict row, u8 id, i8vec2 pos) {
-	u8 colour = colour_from_id(id);
-
-	i8vec2 bpos[4];
-	shape_getblocks(id, bpos);
-	bpos[0] += pos;
-	bpos[1] += pos;
-	bpos[2] += pos;
-	bpos[3] += pos;
-
-	row[bpos[0][VY]][bpos[0][VX]] = colour;
-	row[bpos[1][VY]][bpos[1][VX]] = colour;
-	row[bpos[2][VY]][bpos[2][VX]] = colour;
-	row[bpos[3][VY]][bpos[3][VX]] = colour;
-}
-
-static int plcmnt_valid(u8 *restrict const *restrict const rows, i8vec2 pos) {
-	return pos[VX] >= 0 && pos[VX] < COLUMNS &&
-		pos[VY] >= 0 && pos[VY] < ROWS &&
-		!rows[pos[VY]][pos[VX]];
-}
-
-static int plcmnt_intersect(u8 *restrict const *restrict const rows, const u8 id, i8vec2 pos) {
-	i8vec2 bpos[4];
-	shape_getblocks(id, bpos);
-	return !(plcmnt_valid(rows, pos + bpos[0]) &&
-		plcmnt_valid(rows, pos + bpos[1]) &&
-		plcmnt_valid(rows, pos + bpos[2]) &&
-		plcmnt_valid(rows, pos + bpos[3]));
-}
-
-int place_update(struct gamedata *gdat, int movdat) {
-	// store the current index and ID, only changes when placed (which yields no movement) and rotation (which occurs last)
-	int tmp;
-	u8 id = gdat->pdat.cur;
-
-	// update Y axis
-	tmp = !!(movdat & MOVD);
-	gdat->pdat.sel[VY] += tmp;
-	tmp = tmp && plcmnt_intersect(gdat->rows, id, gdat->pdat.sel);
-	if (tmp) {
-		gdat->pdat.sel[VY]--;
-		plcmnt_place(gdat->rows, id, gdat->pdat.sel);
-		gdat->pnts += clear_rows(gdat->rows) << 4; // clear the rows that have been completed
-		next_shape();
-		audio_play(AUDIO_ID_PLACE);
-
-		if (plcmnt_intersect(gdat->rows, gdat->pdat.cur, gdat->pdat.sel))
-			return 1;
-	}
-
-	// update X axis
-	tmp = !!(movdat & MOVR) - !!(movdat & MOVL);
-	gdat->pdat.sel[VX] += (tmp && !plcmnt_intersect(gdat->rows, id, (i8vec2){gdat->pdat.sel[VX] + tmp, gdat->pdat.sel[VY]})) * tmp;
-
-	// update roll
-	tmp = id ^ (((!!(movdat & MOVRR) - !!(movdat & MOVRL)) * 8 + id) & 31);
-	gdat->pdat.cur ^= (tmp && !plcmnt_intersect(gdat->rows, id ^ tmp, gdat->pdat.sel)) * tmp;
-	return 0;
-}

src/game/tetromino/placing.h

@@ -1,10 +0,0 @@
-#pragma once
-
-#include <stdbool.h>
-#include <stdint.h>
-
-#include "../game.h"
-
-/* updates the movement of the `pdat` structure, updating the rows when colliding downwards.
- * returns `0` if we successfully updated. Returns 1 if we couldn't update. (e.g. when a next block immediately collides) */
-int place_update(struct gamedata *gdat, int movdat);

src/game/tetromino/shapes.c

@@ -1,83 +0,0 @@
-#include "shapes.h"
-
-#include "../../io/colour/colour8.h"
-#include "../../util/types.h"
-#include "../../util/vec.h"
-#include "../../error.h"
-
-void shape_getblocks(u8 id, i8vec2 *restrict out) {
-	struct blockdat {
-		u8 ax : 2, ay : 2;
-		u8 bx : 2, by : 2;
-		u8 cx : 2, cy : 2;
-		u8 dx : 2, dy : 2;
-	} dat;
-
-	switch (id) {
-	// O tetromino
-	case TET_O | TET_R0:
-	case TET_O | TET_R90:
-	case TET_O | TET_R180:
-	case TET_O | TET_R270: dat = (struct blockdat){1, 1, 2, 1, 1, 2, 2, 2}; break;
-
-	// I tetromino
-	case TET_I | TET_R0:   dat = (struct blockdat){0, 1, 1, 1, 2, 1, 3, 1}; break;
-	case TET_I | TET_R90:  dat = (struct blockdat){2, 0, 2, 1, 2, 2, 2, 3}; break;
-	case TET_I | TET_R180: dat = (struct blockdat){0, 2, 1, 2, 2, 2, 3, 2}; break;
-	case TET_I | TET_R270: dat = (struct blockdat){1, 0, 1, 1, 1, 2, 1, 3}; break;
-
-	// S tetromino
-	case TET_S | TET_R0:   dat = (struct blockdat){1, 0, 2, 0, 0, 1, 1, 1}; break;
-	case TET_S | TET_R90:  dat = (struct blockdat){1, 0, 1, 1, 2, 1, 2, 2}; break;
-	case TET_S | TET_R180: dat = (struct blockdat){1, 1, 2, 1, 0, 2, 1, 2}; break;
-	case TET_S | TET_R270: dat = (struct blockdat){0, 0, 0, 1, 1, 1, 1, 2}; break;
-
-	// Z tetromino
-	case TET_Z | TET_R0:   dat = (struct blockdat){0, 0, 1, 0, 1, 1, 2, 1}; break;
-	case TET_Z | TET_R90:  dat = (struct blockdat){2, 0, 1, 1, 2, 1, 1, 2}; break;
-	case TET_Z | TET_R180: dat = (struct blockdat){0, 1, 1, 1, 1, 2, 2, 2}; break;
-	case TET_Z | TET_R270: dat = (struct blockdat){1, 0, 0, 1, 1, 1, 0, 2}; break;
-
-	// T tetromino
-	case TET_T | TET_R0:   dat = (struct blockdat){0, 1, 1, 1, 2, 1, 1, 2}; break;
-	case TET_T | TET_R90:  dat = (struct blockdat){1, 0, 0, 1, 1, 1, 1, 2}; break;
-	case TET_T | TET_R180: dat = (struct blockdat){1, 0, 0, 1, 1, 1, 2, 1}; break;
-	case TET_T | TET_R270: dat = (struct blockdat){1, 0, 1, 1, 2, 1, 1, 2}; break;
-
-	// L tetromino
-	case TET_L | TET_R0:   dat = (struct blockdat){1, 0, 1, 1, 1, 2, 2, 2}; break;
-	case TET_L | TET_R90:  dat = (struct blockdat){0, 1, 1, 1, 2, 1, 0, 2}; break;
-	case TET_L | TET_R180: dat = (struct blockdat){0, 0, 1, 0, 1, 1, 1, 2}; break;
-	case TET_L | TET_R270: dat = (struct blockdat){2, 0, 0, 1, 1, 1, 2, 1}; break;
-
-	// J tetromino
-	case TET_J | TET_R0:   dat = (struct blockdat){1, 0, 1, 1, 0, 2, 1, 2}; break;
-	case TET_J | TET_R90:  dat = (struct blockdat){0, 0, 0, 1, 1, 1, 2, 1}; break;
-	case TET_J | TET_R180: dat = (struct blockdat){1, 0, 2, 0, 1, 1, 1, 2}; break;
-	case TET_J | TET_R270: dat = (struct blockdat){0, 1, 1, 1, 2, 1, 2, 2}; break;
-
-	default:
-#ifndef NDEBUG
-		fatal(1, "something went wrong; couldn't reconise the ID.", );
-#endif
-		break;
-	}
-
-	out[0] = (i8vec2){dat.ax, dat.ay};
-	out[1] = (i8vec2){dat.bx, dat.by};
-	out[2] = (i8vec2){dat.cx, dat.cy};
-	out[3] = (i8vec2){dat.dx, dat.dy};
-}
-
-colour8 colour_from_id(u8 id) {
-	switch (id & 7) {
-	case TET_O: return COLOUR8_YELLOW;
-	case TET_I: return COLOUR8_CYAN;
-	case TET_S: return COLOUR8_GREEN;
-	case TET_Z: return COLOUR8_RED;
-	case TET_T: return COLOUR8_MAGENTA;
-	case TET_L: return COLOUR8_ORANGE;
-	case TET_J: return COLOUR8_BLUE;
-	default:    return COLOUR8_BLACK;
-	}
-}

src/game/tetromino/shapes.h

@@ -1,28 +0,0 @@
-#pragma once
-#include <stdbool.h>
-#include <stdint.h>
-
-#include "../../io/colour/colour8.h"
-#include "../../util/types.h"
-#include "../../util/vec.h"
-
-enum tetromino {
-	TET_O = 0,
-	TET_I = 1,
-	TET_S = 2,
-	TET_Z = 3,
-	TET_T = 4,
-	TET_L = 5,
-	TET_J = 6,
-	TET_R0 = 0,
-	TET_R90 = 8,
-	TET_R180 = 16,
-	TET_R270 = 24,
-};
-
-#define SHAPE_WIDTH  4
-#define SHAPE_HEIGHT 4
-#define TETC         7
-
-void shape_getblocks(u8 id, i8vec2 *out);
-colour8 colour_from_id(u8 id);

src/game/time.c

@@ -1,39 +0,0 @@
-#include "time.h"
-
-#include <stdbool.h>
-#include <time.h>
-
-#if __has_include(<features.h>)
-#include <features.h>
-#endif
-#if __has_include(<features.h>) && _POSIX_C_SOURCE >= 199309L
-#include <bits/time.h>
-static void gettime(struct timespec *ts) {
-	clock_gettime(CLOCK_MONOTONIC, ts);
-}
-#elif defined(_WIN32)
-#include <profileapi.h>
-#include <windows.h>
-#include <winnt.h>
-static void gettime(struct timespec *ts) {
-	LARGE_INTEGER cnt, frq;
-	QueryPerformanceCounter(&cnt);
-	QueryPerformanceFrequency(&frq);
-	ts->tv_sec = (time_t)(cnt.QuadPart / frq.QuadPart);
-	ts->tv_nsec = (time_t)((cnt.QuadPart % frq.QuadPart) * 1000000000 / frq.QuadPart);
-}
-#else
-#error no implementation of a monotonic clock was available
-#endif
-
-time_t time_pull(void) {
-	struct timespec ts;
-	gettime(&ts);
-	return ts.tv_sec * 1000 + ts.tv_nsec / 1000000;
-}
-
-int time_poll(time_t curr, time_t delta, time_t *restrict proj) {
-	bool tpass = curr >= *proj;
-	*proj += tpass * ((curr + delta) - *proj); // adds 0, or the difference to proj
-	return tpass;
-}

src/game/time.h

@@ -1,12 +0,0 @@
-#pragma once
-
-#include <sys/cdefs.h>
-#include <time.h>
-
-/* gets the current time in milliseconds */
-time_t time_pull(void);
-
-/* Polls the time whether a given timeout has passed, comparing against `curr` as the current time.
- * if `curr` ≥ `*proj`, `curr` + `delta` is written to `*proj`. `1` is returned.
- * otherwise, we just return `0`. */
-__nonnull((3)) int time_poll(time_t curr, time_t delta, time_t *restrict proj);

src/io/audio.c

@@ -1,150 +0,0 @@
-#include "audio.h"
-
-#include <SDL_audio.h>
-#include <SDL_error.h>
-#include <SDL_stdinc.h>
-#include <assert.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "../error.h"
-#include "../util/compat.h"
-#include "../util/types.h"
-
-struct audioplayer {
-	const u8 *buf;
-	int len;
-};
-
-static struct audiodevice {
-	struct audioplayer audio[AUDIO_MAX];
-	u32 id;
-	SDL_AudioSpec spec;
-} dev;
-
-struct audiodata audio_dat[AUDIO_ID_COUNT] = {0}; // contains pointers to audio buffers.
-
-static const char *const audio_path[AUDIO_ID_COUNT] = {
-	"korobeiniki.wav",
-	"place.wav",
-};
-
-/* mixes the audio output stream, using the different audio as sources */
-static void audiomixer(void *const userdata, u8 *const stream, const int len) {
-	(void)userdata;
-	memset(stream, 0, len); // clear the playing audio
-
-	// update the counts for the audio array
-	for (unsigned i = 0; i < AUDIO_MAX; i++) {
-		if (dev.audio[i].len > 0) {
-			unsigned mixlen = SDL_min(len, dev.audio[i].len);
-			SDL_MixAudioFormat(stream, dev.audio[i].buf, dev.spec.format, mixlen, SDL_MIX_MAXVOLUME);
-			dev.audio[i].len -= mixlen;
-			dev.audio[i].buf += mixlen;
-		}
-	}
-}
-
-/* converts input audio buffer to one that matches the buffer of dev.
- * `len` is a pointer to the current size, the new size will be written to this location.
- * returns the pointer to the audio buffer to use, or NULL, when something went wrong.
- * NULL will never be returned after the conversion */
-static u8 *audio_cvt(const SDL_AudioSpec *spec, u8 *bufptr, unsigned *len) {
-	if (!bufptr) return NULL;
-
-	// init the converter
-	SDL_AudioCVT cvt;
-	if (SDL_BuildAudioCVT(&cvt, spec->format, spec->channels, spec->freq, dev.spec.format, dev.spec.channels, dev.spec.freq) < 0) {
-		error("could not build the audio converter! SDL Error: %s", SDL_GetError());
-		return NULL;
-	}
-	if (!cvt.needed) return bufptr; // ensure the conversion is necessary
-
-	// grow the inputted buffer for the conversion
-	cvt.len = *len;
-	cvt.buf = realloc(bufptr, cvt.len * cvt.len_mult);
-	if (!cvt.buf) {
-		warn("failed to grow the audio buffer to the new size of %u bytes! audio may be bugged", cvt.len);
-		return bufptr;
-	}
-
-	// convert the audio to the new format
-	if (SDL_ConvertAudio(&cvt) < 0) {
-		warn("couldn't convert an audio buffer to the set format, audio may be bugged! SDL Error: %s", SDL_GetError());
-		assert(cvt.buf);
-		return cvt.buf;
-	}
-	assert(cvt.buf);
-
-	// shrink to reduce memory footprint
-	*len = cvt.len_cvt;
-	bufptr = realloc(cvt.buf, *len);
-	return bufptr ? bufptr : cvt.buf;
-}
-
-/* computes the time in milliseconds of the audio fragment by dividing
- * the audio byte length by the format's bit size, which is divided by
- * the audio device's channels and frequency */
-static inline u32 audio_btoms(u32 len) {
-	return (((1000 * len) / (SDL_AUDIO_BITSIZE(dev.spec.format) / 8)) / dev.spec.channels / dev.spec.freq);
-}
-
-/* loads a `struct audiodata` from `fpat` to `out`. */
-static void audio_wav_load(const char *restrict fpat, struct audiodata *restrict out) {
-	debug("loading audio file '%s'...", fpat);
-	if (faccess(fpat, FA_R)) {
-		error("audio file either isn't readable or doesn't exist. path: '%s'!", fpat);
-		return;
-	}
-
-	// load the audio
-	u32 len;
-	u8 *ptr, *tmp;
-	SDL_AudioSpec spec;
-	SDL_LoadWAV(fpat, &spec, &ptr, &len);
-
-	// convert the audio data to the format reflecting dev
-	tmp = audio_cvt(&spec, ptr, &len);
-	if (!tmp) free(ptr); // free the buffer if NULL was returned; failure
-
-	*out = (struct audiodata){tmp, len, audio_btoms(len)};
-}
-
-/* loads the audio data into the buffer */
-static inline void audio_load(void) {
-	for (size_t i = 0; i < AUDIO_ID_COUNT; i++)
-		audio_wav_load(audio_path[i], &audio_dat[i]);
-}
-
-void audio_play(u32 audio_id) {
-	if (!dev.id) return;
-	size_t i = 0;
-	while (i < AUDIO_MAX && dev.audio[i].len > 0) i++;
-	if (i >= AUDIO_MAX) return;
-
-	dev.audio[i] = (struct audioplayer){
-		audio_dat[audio_id].buf,
-		audio_dat[audio_id].len,
-	};
-}
-
-int audio_init(int freq, SDL_AudioFormat fmt, u8 ch, u16 samples) {
-	// initialise the audio device + specification
-	SDL_AudioSpec spec = {freq, fmt, ch, 0, samples, 0, 0, audiomixer, NULL};
-	unsigned id = SDL_OpenAudioDevice(NULL, 0, &spec, &spec, 0);
-	dev = (struct audiodevice){{0}, id, spec};
-
-	if (!id) return 1;
-	SDL_PauseAudioDevice(id, 0);
-	audio_load();
-	return 0;
-}
-
-void audio_free(void) {
-	SDL_CloseAudioDevice(dev.id);
-	dev = (struct audiodevice){0};
-
-	for (size_t i = 0; i < AUDIO_ID_COUNT; i++)
-		free((void *)audio_dat[i].buf);
-}

src/io/audio.h

@@ -1,33 +0,0 @@
-#pragma once
-
-#include <SDL_audio.h>
-#include <stdint.h>
-
-#include "../util/types.h"
-
-#define AUDIO_MAX 4 // maximum number of sound effects that are allowed to play at once
-
-struct audiodata {
-	const u8 *buf; // pointer to the audio buffer
-	u32 len;       // length in bytes of the audio buffer
-	u32 ms;        // length in miliseconds of the audio buffer
-};
-
-enum audio_id {
-	AUDIO_ID_MUSIC,
-	AUDIO_ID_PLACE,
-
-	// leave at end, will contain count
-	AUDIO_ID_COUNT,
-};
-
-extern struct audiodata audio_dat[AUDIO_ID_COUNT];
-
-/* loads the audio to be played, unless `AUDIO_MAX` has been reached, then this call will fail */
-void audio_play(u32);
-
-/* initialises the audio device, then loads the audio data */
-int audio_init(int freq, SDL_AudioFormat fmt, u8 ch, u16 samples);
-
-/* frees up resources held by the audio device and audio buffers */
-void audio_free(void);

src/io/colour/colour32.h

@@ -1,42 +0,0 @@
-#pragma once
-#include <stdint.h>
-
-#include "SDL_render.h"
-
-// stores colour in a rgba format, each channel being a 8 bits wide.
-typedef union {
-	uint32_t packed;
-	struct {
-		uint8_t a;
-		uint8_t b;
-		uint8_t g;
-		uint8_t r;
-	};
-} colour32;
-
-#define COLOUR32_BLACK   ((colour32){0x000000FF})
-#define COLOUR32_RED     ((colour32){0xFF0000FF})
-#define COLOUR32_YELLOW  ((colour32){0xFFFF00FF})
-#define COLOUR32_ORANGE  ((colour32){0xFF6D00FF})
-#define COLOUR32_GREEN   ((colour32){0x00FF00FF})
-#define COLOUR32_CYAN    ((colour32){0x00FFFFFF})
-#define COLOUR32_BLUE    ((colour32){0x0000FFFF})
-#define COLOUR32_MAGENTA ((colour32){0xFF00FFFF})
-#define COLOUR32_WHITE   ((colour32){0xFFFFFFFF})
-
-// sets the render colour to a colour32 value
-static inline void set_colour32(SDL_Renderer *const renderer, const colour32 c) {
-	(void)SDL_SetRenderDrawColor(renderer, c.r, c.g, c.b, c.a);
-}
-
-// american macros:
-#define color32         colour32
-#define COLOR32_BLACK   COLOUR32_BLACK
-#define COLOR32_RED     COLOUR32_RED
-#define COLOR32_YELLOW  COLOUR32_YELLOW
-#define COLOR32_ORANGE  COLOUR32_ORANGE
-#define COLOR32_GREEN   COLOUR32_GREEN
-#define COLOR32_CYAN    COLOUR32_CYAN
-#define COLOR32_BLUE    COLOUR32_BLUE
-#define COLOR32_MAGENTA COLOUR32_MAGENTA
-#define COLOR32_WHITE   COLOUR32_WHITE

src/io/colour/colour8.h

@@ -1,53 +0,0 @@
-#pragma once
-#include <stdint.h>
-
-#include "SDL_render.h"
-
-// stores colour in a rrrgggbb format, which maps exactly to 8 bits
-typedef uint8_t colour8;
-
-/*                                         rrrg ggbb */
-#define COLOUR8_BLACK   ((colour8)0x00) // 0000 0000
-#define COLOUR8_RED     ((colour8)0xE0) // 1110 0000
-#define COLOUR8_YELLOW  ((colour8)0xFC) // 1111 1100
-#define COLOUR8_ORANGE  ((colour8)0xEC) // 1111 1100
-#define COLOUR8_GREEN   ((colour8)0x1C) // 0001 1100
-#define COLOUR8_CYAN    ((colour8)0x1F) // 0001 1111
-#define COLOUR8_BLUE    ((colour8)0x03) // 0000 0011
-#define COLOUR8_MAGENTA ((colour8)0xE3) // 1110 0011
-#define COLOUR8_WHITE   ((colour8)0xFF) // 1111 1111
-
-// gets the red channel in 32 bit colour space
-static inline uint8_t colour8_red32(const colour8 colour) {
-	return (colour >> 5) * (255 / 7);
-}
-
-// gets the green channel in 32 bit colour space
-static inline uint8_t colour8_green32(const colour8 colour) {
-	return ((colour >> 2) & 7) * (255 / 7);
-}
-
-// gets the blue channel in 32 bit colour space
-static inline uint8_t colour8_blue32(const colour8 colour) {
-	return (colour & 3) * (255 / 3);
-}
-
-// sets the render colour to a colour8 value
-static inline void set_colour8(SDL_Renderer *const renderer, const colour8 c) {
-	(void)SDL_SetRenderDrawColor(renderer, colour8_red32(c), colour8_green32(c), colour8_blue32(c), 0xFF);
-}
-
-// american macros:
-#define color8         colour8
-#define color8_red32   colour8_red32
-#define color8_green32 colour8_green32
-#define color8_blue32  colour8_blue32
-#define COLOR8_BLACK   COLOUR8_BLACK
-#define COLOR8_RED     COLOUR8_RED
-#define COLOR8_YELLOW  COLOUR8_YELLOW
-#define COLOR8_ORANGE  COLOUR8_ORANGE
-#define COLOR8_GREEN   COLOUR8_GREEN
-#define COLOR8_CYAN    COLOUR8_CYAN
-#define COLOR8_BLUE    COLOUR8_BLUE
-#define COLOR8_MAGENTA COLOUR8_MAGENTA
-#define COLOR8_WHITE   COLOUR8_WHITE

src/io/input.c

@@ -1,82 +1,8 @@
-#include "input.h"
-
-#include <SDL_events.h>
-#include <SDL_scancode.h>
-#include <time.h>
-
-#include "../game/time.h"
-#include "../util/types.h"
-#include "window.h"
-
-/* processes an incoming scancode, returns the associated movement data, or performs the close action directly
- * NOTE: if the action is mapped to multiple keys, pressing both and then releasing one, disables the action. Minor issue, won't fix. */
-__attribute__((const)) static int procscancode(SDL_Scancode code) {
-	switch (code) {
-	case SDL_SCANCODE_Q:
-		return MOVRL;
-
-	case SDL_SCANCODE_E:
-		return MOVRR;
-
-	case SDL_SCANCODE_LEFT:
-	case SDL_SCANCODE_A:
-	case SDL_SCANCODE_H:
-		return MOVL;
-
-	case SDL_SCANCODE_RIGHT:
-	case SDL_SCANCODE_D:
-	case SDL_SCANCODE_L:
-		return MOVR;
-
-	case SDL_SCANCODE_DOWN:
-	case SDL_SCANCODE_S:
-	case SDL_SCANCODE_J:
-	case SDL_SCANCODE_SPACE:
-		return MOVD;
-
-	case SDL_SCANCODE_ESCAPE:
-		window_close();
-		return 0;
-	default: return 0;
-	}
-}
-
-static int timeout_mask(time_t time) {
-	static time_t timeout = 0, timeout_roll = 0;
-	int msk = 0;
-	// only add to the mask if time_poll returns `1`, negating becomes `-1`; 0b1111...
-	// this is masked with the desired movement action.
-	msk |= ((MOVR | MOVL | MOVD) & -!!time_poll(time, 64, &timeout));
-	msk |= ((MOVRL | MOVRR) & -!!time_poll(time, 100, &timeout_roll));
-	return msk;
-}
-
-int input_getdat(time_t time) {
-	static u8 movdat = 0, nmovdat = 0, lmovdat = 0;   // stores the static movement data
-	int mov = movdat, nmov = nmovdat, lmov = lmovdat; // stores the runtime movement data for easy register access
-
-	// process the events
-	SDL_Event e;
-	while (SDL_PollEvent(&e)) {
-		switch (e.type) {
-		case SDL_QUIT:    window_close(); break;
-		case SDL_KEYDOWN: mov |= procscancode(e.key.keysym.scancode); break;
-		case SDL_KEYUP:   nmov |= procscancode(e.key.keysym.scancode); break;
-		}
-	}
-
-	// compute the current movement
-	int mask = timeout_mask(time);
-
-	// handle releasing of keys
-	mov &= ~(nmov & lmov & mask);         // only remove the keys that have been pressed since lmov
-	lmov = (mov & mask) | (lmov & ~mask); // set the value of lmov to the new value mov
-	nmov &= mov;                          // set nmov to only those in mov
-	int cmov = mov & mask;
-
-	// write to static variables (shrinking the values, and memory usage)
-	movdat = mov;
-	lmovdat = lmov;
-	nmovdat = nmov;
-	return cmov;
+#include <GLFW/glfw3.h>
+void key_callback(GLFWwindow *win, int key, int scancode, int action, int mods) {
+	(void)win, (void)key, (void)scancode, (void)action, (void)mods;
+#ifndef NDEBUG
+	if (key == GLFW_KEY_ESCAPE && action == GLFW_PRESS)
+		glfwSetWindowShouldClose(win, 1);
+#endif
 }

src/io/input.h

@@ -1,17 +1,5 @@
-#pragma once
-
-#include <time.h>
-
-/* 8 bit enumeration storing the movement data */
-enum movdat {
-	MOVL = 1,   // move left
-	MOVR = 2,   // move right
-	MOVD = 4,   // move down
-	MOVRL = 8,  // move roll left
-	MOVRR = 16, // move roll right
-	MOVPL = 32, // move place
-};
-
-/* returns an OR'd string from `enum movdat`, containing the movement data.
- * assumes that SDL has been initialized and a window has successfully been created. */
-__attribute__((__pure__)) int input_getdat(time_t time);
+#ifndef INPUT_H
+#define INPUT_H 1
+#include <GLFW/glfw3.h>
+void key_callback(GLFWwindow *win, int key, int scancode, int action, int mods);
+#endif

src/io/render.c

@@ -1,125 +1,30 @@
 #include "render.h"
 
-#include <SDL_error.h>
-#include <SDL_pixels.h>
-#include <SDL_rect.h>
-#include <SDL_render.h>
-#include <SDL_surface.h>
-#include <SDL_ttf.h>
-#include <SDL_video.h>
-#include <assert.h>
-#include <stdint.h>
-#include <stdio.h>
-#include <time.h>
+#include <glad/gl.h>
 
-#include "../error.h"
-#include "../game/game.h"
-#include "../game/tetromino/shapes.h"
-#include "../util/types.h"
-#include "../util/vec.h"
-#include "colour/colour32.h"
-#include "colour/colour8.h"
+#include <GLFW/glfw3.h>
 
-#define COLOUR_SCORE COLOUR32_YELLOW
+#include "shader.h"
+#include "../util/error.h"
 
-SDL_Renderer *rend = NULL;
-TTF_Font *font = NULL;
-struct gamedata const *gdat = NULL;
+GLuint pipe;
 
-static SDL_Surface *score_surface = NULL;
-static SDL_Texture *score_texture = NULL;
+int render_init(void) {
+	pipe = glCreateProgram();
+	shader_init(pipe);
+	glLinkProgram(pipe);
+	glValidateProgram(pipe);
 
-static inline i32 colpos(uint column) {
-	return column * BLOCK_WIDTH + 1 + TET_PADDING;
-}
-
-static inline i32 rowpos(uint row) {
-	return row * BLOCK_HEIGHT + 1 + TET_PADDING;
-}
-
-static void draw_score_text(void) {
-	static u16 prev_pts = 0xFFFF; // initialise to maximum, so the code below is triggered on first run
-
-	if (prev_pts ^ gdat->pnts) {
-		char score_text[6] = "0"; // max (base 10) digits of a u16 + null terminator
-		prev_pts = gdat->pnts;
-		if (gdat->pnts) sprintf(score_text, "%hu0", gdat->pnts);
-
-		SDL_FreeSurface(score_surface);
-		SDL_DestroyTexture(score_texture);
-		score_surface = TTF_RenderText_Solid(font, score_text, (SDL_Colour){COLOUR_SCORE.r, COLOUR_SCORE.g, COLOUR_SCORE.b, COLOUR_SCORE.a});
-		score_texture = SDL_CreateTextureFromSurface(rend, score_surface);
+	int len;
+	glGetProgramiv(pipe, GL_INFO_LOG_LENGTH, &len);
+	if (len > 0) {
+		char log[len];
+		glGetProgramInfoLog(pipe, len, &len, log);
+		log[len - 1] = '\0'; // terminate the string one character sooner since the log includes a newline
+		fatal("error whilst linking the pipe: '%s'", log);
 	}
-
-	assert(score_surface && score_texture);
-	SDL_Rect text_rect = {colpos(COLUMNS + 1), rowpos(0), score_surface->w, score_surface->h};
-	SDL_RenderCopy(rend, score_texture, NULL, &text_rect);
+	return 1;
 }
 
-static inline int draw_block(SDL_Renderer *const renderer, i8vec2 pos) {
-	const SDL_Rect block = {colpos(pos[VX]), rowpos(pos[VY]), BLOCK_WIDTH - 1, BLOCK_HEIGHT - 1};
-	return SDL_RenderFillRect(renderer, &block);
-}
-
-static void draw_shape(const u8 id, i8vec2 pos) {
-	set_colour8(rend, colour_from_id(id));
-	i8vec2 bpos[4];
-	shape_getblocks(id, bpos);
-	draw_block(rend, pos + bpos[0]);
-	draw_block(rend, pos + bpos[1]);
-	draw_block(rend, pos + bpos[2]);
-	draw_block(rend, pos + bpos[3]);
-}
-
-static void render_level(void) {
-	for (int y = 0; y < ROWS; y++) {
-		const u8 *row = gdat->rows[y];
-
-		for (int x = 0; x < COLUMNS; x++) {
-			if (row[x] != 0) {
-				set_colour8(rend, row[x]);
-				draw_block(rend, (i8vec2){x, y});
-			}
-		}
-	}
-}
-
-void render_init(SDL_Window *win, struct gamedata const *game_data) {
-	rend = SDL_CreateRenderer(win, -1, SDL_RENDERER_PRESENTVSYNC | SDL_RENDERER_ACCELERATED);
-	if (rend == NULL) fatal(ERROR_SDL_RENDERING_INIT, "Renderer failed to be created! SDL Error: %s", SDL_GetError());
-
-	font = TTF_OpenFont("pixeldroid_botic-regular.ttf", PX_DENS);
-	if (font == NULL) error("Failed to open font! TTF Error: %s", TTF_GetError());
-
-	gdat = game_data;
-}
-
-void render_update(void) {
-	set_colour32(rend, COLOUR32_BLACK);
-	SDL_RenderClear(rend);
-	set_colour32(rend, COLOUR32_WHITE);
-
-	static const SDL_Rect field_size = {TET_PADDING, TET_PADDING, TET_WIDTH + 1, TET_HEIGHT + 1};
-	SDL_RenderDrawRect(rend, &field_size);
-
-	if (font) draw_score_text();
-
-	render_level();
-	draw_shape(gdat->pdat.cur, gdat->pdat.sel);
-	draw_shape(gdat->pdat.nxt[gdat->pdat.idx], (i8vec2){COLUMNS + 1, 3});
-
-	SDL_RenderPresent(rend);
-}
-
-void render_free(void) {
-	assert(rend);
-	SDL_DestroyRenderer(rend);
-	rend = NULL;
-
-	TTF_CloseFont(font);
-	SDL_FreeSurface(score_surface);
-	SDL_DestroyTexture(score_texture);
-	font = NULL;
-	score_surface = NULL;
-	score_texture = NULL;
+void render_update(GLFWwindow *win) {
 }

src/io/render.h

@@ -1,20 +1,8 @@
-#pragma once
+#ifndef RENDER_H
+#define RENDER_H 1
+#include <glad/gl.h>
+#include <GLFW/glfw3.h>
 
-#include <SDL_video.h>
-#include <stdint.h>
-#include <sys/cdefs.h>
-
-#include "../game/game.h"
-
-#define PX_DENS       25                                     // pixel density; pixels per block
-#define TET_PADDING   10                                     // padding around the tetris playing field
-#define TET_WIDTH     (COLUMNS * PX_DENS - TET_PADDING)      // tetris playing field width
-#define TET_HEIGHT    (TET_WIDTH / COLUMNS * ROWS)           // tetris playing field height
-#define SCREEN_WIDTH  ((COLUMNS + 6) * PX_DENS)              // window width
-#define SCREEN_HEIGHT ((COLUMNS) * PX_DENS / COLUMNS * ROWS) // window height
-#define BLOCK_WIDTH   (TET_WIDTH / COLUMNS)                  // width of a block
-#define BLOCK_HEIGHT  (TET_HEIGHT / ROWS)                    // height of a block
-
-__nonnull((1, 2)) void render_init(SDL_Window *, struct gamedata const *);
-void render_update(void); // causes a draw to occur, will also determine update rate
-void render_free(void);   // frees the memory allocated to the renderer in render_data
+int render_init(void);
+void render_update(GLFWwindow *win);
+#endif

src/io/shader.c

@@ -0,0 +1,50 @@
+#include "shader.h"
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "../util/error.h"
+
+
+/* for compiling a shader */
+static GLuint shader_compile(GLenum type, const char *src, size_t len) {
+	int ilen = len;
+	GLuint shader = glCreateShader(type);
+	glShaderSource(shader, 1, &src, &ilen);
+	glCompileShader(shader);
+
+	/* Repurposing ilen for the max length of the shader log */
+	glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &ilen);
+	if (ilen > 0) {
+		char log[ilen];
+		glGetShaderInfoLog(shader, ilen, &ilen, log);
+		log[ilen - 1] = '\0'; // terminate the string one character sooner since the log includes a newline
+		error("error whilst compiling shader type '0X%X': '%s'", type, log);
+	}
+
+	return shader;
+}
+
+#define NAME_START(name) _binary_res_##name##_start /* name of a start variable */
+#define NAME_END(name)   _binary_res_##name##_end   /* name of an end variable */
+
+/* wrapper for calling `shader_compile`, but with some more sane parameters. */
+#define ADD_SHADER(_type, _name, _store)                                                                                  \
+	do {                                                                                                              \
+		extern const char NAME_START(_name)[];                                                                    \
+		extern const char NAME_END(_name)[];                                                                      \
+		(_store) = shader_compile(_type, NAME_START(_name), (size_t)NAME_END(_name) - (size_t)NAME_START(_name)); \
+	} while (0)
+
+int shader_init(GLuint pipe) {
+	GLuint vs, fs;
+	ADD_SHADER(GL_VERTEX_SHADER, sh_vert_glsl, vs);
+	ADD_SHADER(GL_FRAGMENT_SHADER, sh_frag_glsl, fs);
+
+	glAttachShader(pipe, vs);
+	glAttachShader(pipe, fs);
+
+	glDeleteShader(vs);
+	glDeleteShader(fs);
+	return 1;
+}

src/io/shader.h

@@ -0,0 +1,5 @@
+#ifndef SHADER_H
+#define SHADER_H 1
+#include <glad/gl.h>
+int shader_init(GLuint pipe);
+#endif

src/io/window.c

@@ -1,60 +1,64 @@
 #include "window.h"
 
-#include <SDL.h>
-#include <SDL_audio.h>
-#include <SDL_error.h>
-#include <SDL_video.h>
 #include <assert.h>
-#include <time.h>
+#include <glad/gl.h>
+#include <GLFW/glfw3.h>
 
-#include "../error.h"
-#include "../game/game.h"
-#include "../game/time.h"
-#include "SDL_ttf.h"
-#include "audio.h"
+#include "../tetris.h"
+#include "../util/error.h"
 #include "input.h"
 #include "render.h"
 
-static SDL_Window *win = NULL;
-static bool close = false;
+#define WIN_DPI    32
+#define WIN_WIDTH  (WIN_DPI * (TET_WIDTH + 3))
+#define WIN_HEIGHT (WIN_DPI * TET_HEIGHT)
 
-void window_init(struct gamedata const *gdat) {
-	assert(!win && !close);
-	if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0)
-		fatal(ERROR_SDL_INIT, "SDL could not initialize! SDL Error: %s", SDL_GetError());
-	if (TTF_Init() < 0)
-		fatal(ERROR_SDL_INIT, "TTF could not initialize! TTF Error: %s", TTF_GetError());
+static GLFWwindow *win = NULL;
 
-	win = SDL_CreateWindow("tetris clone", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
-	if (win == NULL)
-		fatal(ERROR_SDL_RENDERING_INIT, "Window failed to be created! SDL Error: %s", SDL_GetError());
+int window_init(void) {
+#ifndef NDEBUG
+	glfwWindowHint(GLFW_OPENGL_DEBUG_CONTEXT, GLFW_TRUE);
+#endif
+	glfwWindowHint(GLFW_RESIZABLE, GLFW_FALSE);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
+	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
+	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
+	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE);
+	glfwWindowHint(GLFW_RED_BITS, 3);
+	glfwWindowHint(GLFW_GREEN_BITS, 3);
+	glfwWindowHint(GLFW_BLUE_BITS, 2);
+	glfwWindowHint(GLFW_ALPHA_BITS, 0);
+	win = glfwCreateWindow(WIN_WIDTH, WIN_HEIGHT, "Quinn's tetris", NULL, NULL);
+	if (!win) return 1;
 
-	render_init(win, gdat);
-	audio_init(32000, AUDIO_S16, 1, 4096);
+	glfwMakeContextCurrent(win);
+	if (!gladLoadGL(glfwGetProcAddress)) return 1;
+	glfwSwapInterval(1); /* Wait one screen update for redraw. A.k.a. "vsync" */
+
+	glfwSetKeyCallback(win, key_callback);
+
+	debug(
+		"version info:\n"
+		"\tvendor:       %s\n"
+		"\trenderer:     %s\n"
+		"\tversion:      %s\n"
+		"\tshading lang: %s\n",
+		glGetString(GL_VENDOR),
+		glGetString(GL_RENDERER),
+		glGetString(GL_VERSION),
+		glGetString(GL_SHADING_LANGUAGE_VERSION));
+
+	return 0; //render_init();
 }
 
-void window_free(void) {
-	assert(win);
-	render_free();
-	SDL_DestroyWindow(win);
-	win = NULL;
-	close = false;
+void window_loop(void) {
+	assert(win != NULL);
+	while (!glfwWindowShouldClose(win)) {
+		glfwWaitEventsTimeout(1.0 / 60.0);
 
-	audio_free();
-}
-
-void window_open(void) {
-	while (!close) {
-		size_t time = time_pull();
-		game_update(input_getdat(time), time);
-		render_update();
-
-		static time_t timeout = 0;
-		if (time_poll(time, audio_dat[AUDIO_ID_MUSIC].ms, &timeout))
-			audio_play(AUDIO_ID_MUSIC);
+		// render_update(win);
+		glfwSwapBuffers(win);
 	}
-}
 
-void window_close(void) {
-	close = true;
+	glfwDestroyWindow(win);
 }

src/io/window.h

@@ -1,12 +1,5 @@
-#pragma once
-
-#include "../game/game.h"
-
-#define PX_DENS       25                                     // pixel density; pixels per block
-#define SCREEN_WIDTH  ((COLUMNS + 6) * PX_DENS)              // window width
-#define SCREEN_HEIGHT ((COLUMNS) * PX_DENS / COLUMNS * ROWS) // window height
-
-void window_init(struct gamedata const *);
-void window_open(void);
-void window_close(void);
-void window_free(void);
+#ifndef WINDOW_H
+#define WINDOW_H 1
+int window_init(void);
+void window_loop(void);
+#endif

src/main.c

@@ -1,25 +1,33 @@
-#include <SDL.h>
+#include <GLFW/glfw3.h>
+#include <stdio.h>
 #include <stdlib.h>
-
-#include "error.h"
-#include "game/game.h"
 #include "io/window.h"
+#include "util/error.h"
 
-static void stop(void) {
-	debug("stopping...", );
-	window_close();
-	window_free();
-	SDL_Quit();
+/* callback for GLFW errors */
+static void error_callback(int err, const char *const msg) {
+	error("glfw (%i); \"%s\"", err, msg);
 }
 
-// entry-point of the application
-int main(int argc, char **argv) {
-	(void)argc, (void)argv;
-	// register stop as exit function
-	atexit(stop);
-
-	window_init(game_init());
-	window_open();
+static int init(void) {
+	glfwSetErrorCallback(error_callback);
+	glfwInitHint(GLFW_JOYSTICK_HAT_BUTTONS, GLFW_FALSE); // disable joystick buttons
 
+	if (!glfwInit()) return 1;
+	if (window_init()) return 1;
 	return 0;
 }
+
+void quit(void) {
+	glfwTerminate();
+}
+
+int main(int argc, char **argv) {
+	(void)argc, (void)argv;
+	printf("debug: [DBG], info: [INF], warning: [WAR], error: [ERR], fatal: [FAT]\n");
+	atexit(quit);
+	if (init()) fatal("failed to initialise the programme!");
+	window_loop();
+	quit();
+	return EXIT_SUCCESS;
+}

src/tetris.c

@@ -0,0 +1,81 @@
+#include "tetris.h"
+
+#include <string.h>
+#include "util/intdef.h"
+
+/* Board co-ordinates:
+ * 0 1 2 3
+ * 4 5 6 7
+ * 8 9 A B
+ * C D E F */
+const u16 tetromino_shapes[7][4] = {
+	/*         NONE    CW_90   CW_180  CW_270 */
+	[TET_I] = {0x159D, 0x89AB, 0x26AE, 0x4567},
+	[TET_O] = {0x569A, 0x569A, 0x569A, 0x569A},
+	[TET_T] = {0x1456, 0x1569, 0x4569, 0x1459},
+	[TET_J] = {0x0456, 0x1259, 0x456A, 0x1589},
+	[TET_L] = {0x4536, 0x159A, 0x4568, 0x0159},
+	[TET_S] = {0x1245, 0x156A, 0x5689, 0x0459},
+	[TET_Z] = {0x0156, 0x2569, 0x459A, 0x1458},
+};
+
+void tetris_get_blocks(u8 tetromino, uint *restrict positions) {
+	uint shape = tetromino_shapes[tetromino & 7][tetromino >> 3];
+	uint *end = positions + 8;
+	while (positions < end) {
+		*positions += shape & 3;
+		shape >>= 2;
+		positions++;
+	}
+}
+
+void tetris_init_rows(const u8 *restrict data, const u8 *restrict *restrict out) {
+	const u8 *restrict *end = out + TET_HEIGHT;
+	while (out < end) {
+		*out = data;
+		data += TET_WIDTH;
+		out++;
+	}
+}
+
+int tetris_clear_rows(u8 *restrict *restrict rows) {
+	int count = 0;
+	u8 *cache[4]; /* the maximum amount of rows the user can clear at once is four */
+
+	for (int y = 0; y < TET_HEIGHT; y++) {
+		int x = 0;
+		while (x < TET_WIDTH && rows[y][x] && count < 4) x++;
+		if (x >= TET_WIDTH) cache[count++] = rows[y];
+		else rows[y - count] = rows[y];
+	}
+
+	if (count) {
+		for (int i = 0; i < count; i++) {
+			memset(cache[i], 0, TET_WIDTH);
+			rows[TET_HEIGHT - 1 - i] = cache[i];
+		}
+	}
+	return count;
+}
+
+int tetris_intersect(const u8 *restrict const *restrict rows, u8 tetromino, uint x, uint y) {
+	uint *pos = (uint[8]){x, y, x, y, x, y, x, y};
+	uint *end = pos + 8;
+	tetris_get_blocks(tetromino, pos);
+	for (; pos < end; pos += 2) {
+		if (*(pos + 0) >= TET_WIDTH) return 2;
+		if (*(pos + 1) >= TET_HEIGHT) return 2;
+		if (rows[*(pos + 1)][*pos]) break;
+	}
+	return pos < end;
+}
+
+void tetris_place(u8 *restrict *restrict rows, u8 tetromino, uint x, uint y) {
+	uint *pos = (uint[8]){x, y, x, y, x, y, x, y};
+	uint *end = pos + 8;
+	tetris_get_blocks(tetromino, pos);
+	tetromino &= 7;    /* strip rotation data */
+	tetromino |= TET_NON_EMPTY;
+	for (; pos < end; pos += 2)
+		rows[*(pos + 1)][*pos] = tetromino;
+}

src/tetris.h

@@ -0,0 +1,59 @@
+#ifndef TETRIS_H
+#define TETRIS_H 1
+#include "util/intdef.h"
+#include "util/atrb.h"
+
+#define TET_WIDTH  10
+#define TET_HEIGHT 24 /* height may be 16—24 */
+
+/* Defines tetromino indices.
+ * The `TET_R*` definitions specify various rotations.
+ * This is designed to be OR'd with the tetromino shape index.
+ * Shape index can be obtained via `val & 7`, and rotation index is
+ * obtained via `val >> 3`. */
+enum tetromino {
+	TET_I = 0x00,
+	TET_O = 0x01,
+	TET_T = 0x02,
+	TET_J = 0x03,
+	TET_L = 0x04,
+	TET_S = 0x05,
+	TET_Z = 0x06,
+	TET_R0 = 0x00,
+	TET_R90 = 0x08,
+	TET_R180 = 0x10,
+	TET_R270 = 0x18,
+
+	/* Used when storing blocks to the board;
+	 * allows to identify non-empty indices from empty ones.
+	 * This value should not be used during general computation. */
+	TET_NON_EMPTY = 0x80,
+};
+
+/* Stores the co-ordinates of the four blocks in a 4x4 plane.
+ * Each co-ordinate is 4 bits wide in total. (2 bits for each axis).
+ * This is done over encoding the shape directly within the 16 bits (4²),
+ * since this is more easily parsed in practice. */
+extern const u16 tetromino_shapes[7][4];
+
+/* Adds the block position data to the numbers in `positions`.
+ * it is assumed `positions` has at least eight members and is initialised. `(X,Y)*4 = 8` */
+void tetris_get_blocks(u8 tetromino, uint *restrict positions) NONNULL((2));
+
+/* Initialises the rows of the Tetris play field.
+ * `data` is assumed to point to data of at least `TET_WIDTH * TET_HEIGHT` members.
+ * `out` is assumed to point to data of at least `TET_HEIGHT` members; the row pointers shall be outputted here. */
+void tetris_init_rows(const u8 *restrict data, const u8 *restrict *restrict out) NONNULL((1, 2));
+
+/* Finds up to 4 filled rows in `rows`, moving succeeding rows down and adding the cleared row on top.
+ * It is assumed `rows[0]` is the bottom row and `rows[TET_WIDTH-1]` is the top row.
+ * Returns the amount of rows cleared. */
+int tetris_clear_rows(u8 *restrict *restrict rows) NONNULL((1));
+
+/* Checks if `tetromino` intersects at (`x`, `y`) in the data within `rows` or is out-of-bounds,
+ * returns `1` if it overlaps within `rows`, `2` if it is out-of-bounds, `0` if no intersection is found. */
+int tetris_intersect(const u8 *restrict const *restrict rows, u8 tetromino, uint x, uint y) NONNULL((1));
+
+/* Writes the blocks of `tetromino` to `rows` at position `x` and `y`. */
+void tetris_place(u8 *restrict *restrict rows, u8 tetromino, uint x, uint y) NONNULL((1));
+#endif

src/util/compat.h

@@ -1,57 +0,0 @@
-#pragma once
-
-#if defined __unix__
-#include <features.h>
-#include <unistd.h>
-#elif defined _WIN32
-#include <io.h>
-#else
-#error platform not supported!
-#endif
-
-#ifdef _WIN32
-#define PATH_SEP        '\\' // contains the path separator as a character. Yes it is extremely annoying that this has to exist.
-#define PATH_SEP_STR    "\\" // contains the path separator as a string, useful for concatenation. Yes it is extremely annoying that this has to exist.
-
-#define unixonly(_exec)       // (no-op) executes inline code when __unix__ is defined, otherwise is no-op
-#define winonly(_exec)  _exec // executes inline code when _WIN32 is defined, otherwise is no-op
-#else
-#define PATH_SEP        '/' // contains the path separator as a character. Yes it is extremely annoying that this has to exist.
-#define PATH_SEP_STR    "/" // contains the path separator as a string, useful for concatenation. Yes it is extremely annoying that this has to exist.
-
-#define unixonly(_exec) _exec // executes inline code when __unix__ is defined, otherwise is no-op
-#define winonly(_exec)        // (no-op) executes inline code when _WIN32 is defined, otherwise is no-op
-#endif
-
-// define the constants if they haven't been
-#ifndef F_OK
-#define F_OK 0
-#endif
-#ifndef X_OK
-#define X_OK 1
-#endif
-#ifndef W_OK
-#define W_OK 2
-#endif
-#ifndef R_OK
-#define R_OK 4
-#endif
-
-enum faccess_perms {
-	FA_F = F_OK, // test for file's existence
-	FA_X = X_OK, // test for executing permission
-	FA_W = W_OK, // test for write permissions
-	FA_R = R_OK, // test for read permissions
-};
-
-/* tests a files access with F_OK, X_OK, R_OK, W_OK OR'd together
-   returns 0 upon success. -1 when errno is set and anything else when one or more of the permissions isn't set */
-static inline int faccess(const char *restrict fname, int perms) {
-#if defined __unix__ && _POSIX_C_SOURCE >= 200809L
-	return access(fname, perms);
-#elif defined _WIN32
-	return _access(fname, perms);
-#else
-#error platform unsupported!
-#endif
-}

src/util/error.c

@@ -0,0 +1,51 @@
+#include "error.h"
+
+#include <stdarg.h>
+#include <stdio.h>
+
+#include "intdef.h"
+
+static void error_log(FILE *restrict stream, const char *restrict pfx, uint ln, const char *restrict file, const char *restrict fmt, va_list ap) {
+	fprintf(stream, "(%s:%u) [%s] '", file, ln, pfx);
+
+	vfprintf(stream, fmt, ap);
+
+	fprintf(stream, "'\n");
+}
+
+void error_dbg(uint ln, const char *restrict file, const char *restrict fmt, ...) {
+	va_list ap;
+	va_start(ap, fmt);
+	error_log(stdout, "\033[95mDBG\033[0m", ln, file, fmt, ap);
+	va_end(ap);
+}
+
+void error_inf(uint ln, const char *restrict file, const char *restrict fmt, ...) {
+	va_list ap;
+	va_start(ap, fmt);
+	error_log(stdout, "\033[93mINF\033[0m", ln, file, fmt, ap);
+	va_end(ap);
+}
+
+void error_war(uint ln, const char *restrict file, const char *restrict fmt, ...) {
+	va_list ap;
+	va_start(ap, fmt);
+	error_log(stdout, "\033[91mWAR\033[0m", ln, file, fmt, ap);
+	va_end(ap);
+}
+
+void error_err(uint ln, const char *restrict file, const char *restrict fmt, ...) {
+	va_list ap;
+	va_start(ap, fmt);
+	error_log(stdout, "\033[mFAT\033[0m", ln, file, fmt, ap);
+	va_end(ap);
+}
+
+void error_fat(uint ln, const char *restrict file, const char *restrict fmt, ...) {
+	va_list ap;
+	va_start(ap, fmt);
+	error_log(stdout, "\033[mFAT\033[0m", ln, file, fmt, ap);
+	va_end(ap);
+
+	exit(EXIT_FAILURE);
+}

src/util/error.h

@@ -0,0 +1,22 @@
+
+/* Copyright (c) 2025 Quinn
+ * Licensed under the MIT Licence. See LICENSE for details */
+#pragma once
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "atrb.h"
+#include "intdef.h"
+
+void error_dbg(uint ln, const char *restrict file, const char *restrict fmt, ...);
+void error_inf(uint ln, const char *restrict file, const char *restrict fmt, ...);
+void error_war(uint ln, const char *restrict file, const char *restrict fmt, ...);
+void error_err(uint ln, const char *restrict file, const char *restrict fmt, ...);
+void error_fat(uint ln, const char *restrict file, const char *restrict fmt, ...) NORET;
+
+#define debug(s, ...) error_dbg(__LINE__, __FILE__, s, ##__VA_ARGS__)
+#define info(s, ...)  error_inf(__LINE__, __FILE__, s, ##__VA_ARGS__)
+#define warn(s, ...)  error_war(__LINE__, __FILE__, s, ##__VA_ARGS__)
+#define error(s, ...) error_err(__LINE__, __FILE__, s, ##__VA_ARGS__)
+#define fatal(s, ...) error_fat(__LINE__, __FILE__, s, ##__VA_ARGS__)