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#version 420 core
layout(location = 0) in vec4 inRect;
layout(location = 1) in vec4 inTexRect;
layout(push_constant) uniform PushConstants {
mat4 mvp;
vec4 clip_bounds;
vec4 clip_widths;
vec4 clip_heights;
} push;
layout(location = 0) out vec2 outPos;
layout(location = 1) out vec2 outTexCoord;
layout(location = 2) out flat vec4 outClipBounds;
layout(location = 3) out flat vec4 outClipWidths;
out gl_PerVertex {
vec4 gl_Position;
};
vec2 offsets[6] = { vec2(0.0, 0.0),
vec2(1.0, 0.0),
vec2(0.0, 1.0),
vec2(0.0, 1.0),
vec2(1.0, 0.0),
vec2(1.0, 1.0) };
vec4 intersect(vec4 a, vec4 b)
{
a = vec4(a.xy, a.xy + a.zw);
b = vec4(b.xy, b.xy + b.zw);
vec4 result = vec4(max(a.xy, b.xy), min(a.zw, b.zw));
if (any (greaterThanEqual (result.xy, result.zw)))
return vec4(0.0,0.0,0.0,0.0);
return vec4(result.xy, result.zw - result.xy);
}
void main() {
vec4 rect = intersect(inRect, push.clip_bounds);
vec2 pos = rect.xy + rect.zw * offsets[gl_VertexIndex];
gl_Position = push.mvp * vec4 (pos, 0.0, 1.0);
outPos = pos;
outClipBounds = push.clip_bounds;
outClipWidths = push.clip_widths;
vec4 texrect = vec4((rect.xy - inRect.xy) / inRect.zw,
rect.zw / inRect.zw);
texrect = vec4(inTexRect.xy + inTexRect.zw * texrect.xy,
inTexRect.zw * texrect.zw);
outTexCoord = texrect.xy + texrect.zw * offsets[gl_VertexIndex];
}
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