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#version 440
layout(location = 0) in vec4 vertex;
layout(location = 1) in vec4 vertexColor;
layout(location = 2) in vec4 vertexOffset;
layout(location = 0) out vec4 color;
layout(std140, binding = 0) uniform buf {
#if QSHADER_VIEW_COUNT >= 2
mat4 matrix[QSHADER_VIEW_COUNT];
#else
mat4 matrix;
#endif
vec2 pixelSize;
float opacity;
};
void main()
{
#if QSHADER_VIEW_COUNT >= 2
vec4 pos = matrix[gl_ViewIndex] * vertex;
vec4 m0 = matrix[gl_ViewIndex][0];
vec4 m1 = matrix[gl_ViewIndex][1];
#else
vec4 pos = matrix * vertex;
vec4 m0 = matrix[0];
vec4 m1 = matrix[1];
#endif
gl_Position = pos;
if (vertexOffset.x != 0.) {
vec4 delta = m0 * vertexOffset.x;
vec2 dir = delta.xy * pos.w - pos.xy * delta.w;
vec2 ndir = .5 * pixelSize * normalize(dir / pixelSize);
dir -= ndir * delta.w * pos.w;
float numerator = dot(dir, ndir * pos.w * pos.w);
float scale = 0.0;
if (numerator < 0.0)
scale = 1.0;
else
scale = min(1.0, numerator / dot(dir, dir));
gl_Position += scale * delta;
}
if (vertexOffset.y != 0.) {
vec4 delta = m1 * vertexOffset.y;
vec2 dir = delta.xy * pos.w - pos.xy * delta.w;
vec2 ndir = .5 * pixelSize * normalize(dir / pixelSize);
dir -= ndir * delta.w * pos.w;
float numerator = dot(dir, ndir * pos.w * pos.w);
float scale = 0.0;
if (numerator < 0.0)
scale = 1.0;
else
scale = min(1.0, numerator / dot(dir, dir));
gl_Position += scale * delta;
}
color = vertexColor * opacity;
}
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