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#version 440
layout(location = 0) in vec4 vCoord;
layout(location = 1) in vec2 tCoord;
layout(location = 0) out vec3 sampleNearLeft;
layout(location = 1) out vec3 sampleNearRight;
layout(std140, binding = 0) uniform buf {
mat4 matrix;
vec2 textureScale;
vec4 color;
float alphaMin;
float alphaMax;
// up to this point it must match distancefieldtext
float fontScale;
vec4 vecDelta;
} ubuf;
out gl_PerVertex { vec4 gl_Position; };
void main()
{
vec2 sampleCoord = tCoord * ubuf.textureScale;
gl_Position = ubuf.matrix * vCoord;
// Calculate neighbor pixel position in item space.
vec3 wDelta = gl_Position.w * ubuf.vecDelta.xyw;
vec3 nearLeft = vCoord.xyw - 0.25 * wDelta;
vec3 nearRight = vCoord.xyw + 0.25 * wDelta;
// Calculate neighbor texture coordinate.
vec2 scale = ubuf.textureScale / ubuf.fontScale;
vec2 base = sampleCoord - scale * vCoord.xy;
sampleNearLeft = vec3(base * nearLeft.z + scale * nearLeft.xy, nearLeft.z);
sampleNearRight = vec3(base * nearRight.z + scale * nearRight.xy, nearRight.z);
}
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