25 lines
655 B
GLSL
25 lines
655 B
GLSL
#version 450 core
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layout (location = 0) in vec2 aPos;
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layout (location = 1) in vec2 aTexCoord;
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out vec2 TexCoord;
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uniform vec2 u_position; //Position in scrren coordinates (pixel)
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uniform vec2 u_size; //size in pixels (width, height)
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uniform vec2 u_resolution; //window resolution
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void main(){
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//Covert from screen coordinated to normalized device corrdinates
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//Screen coordinates: origin at top-left , y down
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vec2 screen_pos = aPos * u_size + u_position;
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vec2 ndc;
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ndc.x = (screen_pos.x / u_resolution.x) * 2.0 - 1.0;
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ndc.y = 1.0 - (screen_pos.y / u_resolution.x) * 2.0;
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gl_Position = vec4(ndc, 0.0, 1.0);
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TexCoord = aTexCoord;
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} |