44 lines
1011 B
GLSL
44 lines
1011 B
GLSL
#version 150
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uniform mat4 transform;
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in vec3 left_top;
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in vec2 right_bottom;
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in vec2 tex_left_top;
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in vec2 tex_right_bottom;
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in vec4 color;
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out vec2 f_tex_pos;
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out vec4 f_color;
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// generate positional data based on vertex ID
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void main() {
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vec2 pos = vec2(0.0);
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float left = left_top.x;
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float right = right_bottom.x;
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float top = left_top.y;
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float bottom = right_bottom.y;
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switch (gl_VertexID) {
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case 0:
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pos = vec2(left, top);
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f_tex_pos = tex_left_top;
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break;
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case 1:
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pos = vec2(right, top);
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f_tex_pos = vec2(tex_right_bottom.x, tex_left_top.y);
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break;
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case 2:
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pos = vec2(left, bottom);
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f_tex_pos = vec2(tex_left_top.x, tex_right_bottom.y);
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break;
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case 3:
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pos = vec2(right, bottom);
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f_tex_pos = tex_right_bottom;
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break;
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}
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f_color = color;
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gl_Position = transform * vec4(pos, left_top.z, 1.0);
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}
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