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31 lines
997 B
GLSL
31 lines
997 B
GLSL
/* This file is part of MCA-Selector-lite,
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* and is licensed under GPL-2.0-only.
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* Copyright (C)2025 quinnthepigeon@proton.me Quinn
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* For further information, view COPYING and CONTRIBUTORS
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* at: www.github.com/thepigeongenerator/mcaselector-lite */
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#version 330 core
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layout(points) in;
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layout(triangle_strip, max_vertices = 4) out; // output the vertices of this rectangle
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void push_vert(float x, float y) {
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gl_Position = vec4(x, y, 0.0F, 1.0F);
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EmitVertex();
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}
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void main() {
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// position data is stored as (x,y,w,h)
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vec4 rect_a = gl_in[0].gl_Position; // get the rectangle data which will be our first point of the rectangle
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vec2 rect_d = vec2( // compute point D
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rect_a.x + rect_a.z,
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rect_a.y - rect_a.w);
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// A---B
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// C---D
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// triangle_strip will use the last two vertices to create a triangle
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push_vert(rect_a.x, rect_a.y); // A
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push_vert(rect_d.x, rect_a.y); // B
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push_vert(rect_a.x, rect_d.y); // C
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push_vert(rect_d.x, rect_d.y); // D
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EndPrimitive();
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}
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