diff options
Diffstat (limited to 'src/quick/scenegraph/shaders_ng/loqsubpixeldistancefieldtext.vert')
-rw-r--r-- | src/quick/scenegraph/shaders_ng/loqsubpixeldistancefieldtext.vert | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/src/quick/scenegraph/shaders_ng/loqsubpixeldistancefieldtext.vert b/src/quick/scenegraph/shaders_ng/loqsubpixeldistancefieldtext.vert new file mode 100644 index 0000000000..187c384959 --- /dev/null +++ b/src/quick/scenegraph/shaders_ng/loqsubpixeldistancefieldtext.vert @@ -0,0 +1,37 @@ +#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); +} |