compose.vert RawHistoryFolder

1#version 450
2// One quad per draw: two triangles over the visible target rect.
3
4layout(push_constant) uniform Draw {
5    ivec4 rect;  // visible x0, y0, x1, y1 in target pixels
6    vec4 map;    // source texel = map.xy + fragment centre * map.zw
7    vec4 color;  // solid fills: premultiplied RGBA
8    uvec4 buf;   // buffer draws: first word, row width, height, unused
9    uvec4 misc;  // mode, flags, target width, target height
10} d;
11
12void main() {
13    const ivec2 corners[6] = ivec2[](ivec2(0, 0), ivec2(1, 0), ivec2(0, 1), ivec2(0, 1), ivec2(1, 0), ivec2(1, 1));
14    ivec2 c = corners[gl_VertexIndex];
15    vec2 p = vec2(c.x == 0 ? d.rect.x : d.rect.z, c.y == 0 ? d.rect.y : d.rect.w);
16    gl_Position = vec4(p / vec2(d.misc.zw) * 2.0 - 1.0, 0.0, 1.0);
17}