wlroots-hyprland/render/vulkan/shaders/common.vert

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