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19 lines
473 B
19 lines
473 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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void main() {
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vec2 pos = vec2(float((gl_VertexIndex + 1) & 2) * 0.5f,
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float(gl_VertexIndex & 2) * 0.5f);
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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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