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https://github.com/curioustorvald/Terrarum.git
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32 lines
795 B
GLSL
32 lines
795 B
GLSL
#version 150
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in vec4 a_position;
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in vec2 a_texCoord0;
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uniform vec2 u_textureSize;
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out vec4 v_texCoord[4];
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void main() {
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gl_Position = a_position;
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vec2 ps = 1.0/u_textureSize;
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float dx = ps.x;
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float dy = ps.y;
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// +----+----+----+
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// | | | |
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// | w1 | w2 | w3 |
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// +----+----+----+
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// | | | |
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// | w4 | w5 | w6 |
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// +----+----+----+
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// | | | |
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// | w7 | w8 | w9 |
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// +----+----+----+
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v_texCoord[0].zw = ps;
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v_texCoord[0].xy = a_texCoord0.xy;
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v_texCoord[1] = a_texCoord0.xxxy + vec4(-dx, 0, dx, -dy); // w1 | w2 | w3
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v_texCoord[2] = a_texCoord0.xxxy + vec4(-dx, 0, dx, 0); // w4 | w5 | w6
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v_texCoord[3] = a_texCoord0.xxxy + vec4(-dx, 0, dx, dy); // w7 | w8 | w9
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} |