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26 lines
519 B
26 lines
519 B
#version 450
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// we use a mat4 since it uses the same size as mat3 due to
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// alignment. Easier to deal with (tighly-packed) mat4 though.
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layout(push_constant, row_major) uniform UBO {
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mat4 proj;
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vec2 uv_offset;
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vec2 uv_size;
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} data;
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layout(location = 0) out vec2 uv;
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// 4 outlining points and uv coords
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const vec2[] values = {
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{0, 0},
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{1, 0},
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{1, 1},
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{0, 1},
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};
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void main() {
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vec2 pos = values[gl_VertexIndex % 4];
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uv = data.uv_offset + pos * data.uv_size;
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gl_Position = data.proj * vec4(pos, 0.0, 1.0);
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}
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