diff options
Diffstat (limited to 'src/quick/scenegraph/shaders/hiqsubpixeldistancefieldtext.vert')
-rw-r--r-- | src/quick/scenegraph/shaders/hiqsubpixeldistancefieldtext.vert | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/quick/scenegraph/shaders/hiqsubpixeldistancefieldtext.vert b/src/quick/scenegraph/shaders/hiqsubpixeldistancefieldtext.vert new file mode 100644 index 0000000000..62768e88e1 --- /dev/null +++ b/src/quick/scenegraph/shaders/hiqsubpixeldistancefieldtext.vert @@ -0,0 +1,34 @@ +uniform highp mat4 matrix; +uniform highp vec2 textureScale; +uniform highp float fontScale; +uniform highp vec4 vecDelta; + +attribute highp vec4 vCoord; +attribute highp vec2 tCoord; + +varying highp vec2 sampleCoord; +varying highp vec3 sampleFarLeft; +varying highp vec3 sampleNearLeft; +varying highp vec3 sampleNearRight; +varying highp vec3 sampleFarRight; + +void main() +{ + sampleCoord = tCoord * textureScale; + gl_Position = matrix * vCoord; + + // Calculate neighbor pixel position in item space. + highp vec3 wDelta = gl_Position.w * vecDelta.xyw; + highp vec3 farLeft = vCoord.xyw - 0.667 * wDelta; + highp vec3 nearLeft = vCoord.xyw - 0.333 * wDelta; + highp vec3 nearRight = vCoord.xyw + 0.333 * wDelta; + highp vec3 farRight = vCoord.xyw + 0.667 * wDelta; + + // Calculate neighbor texture coordinate. + highp vec2 scale = textureScale / fontScale; + highp vec2 base = sampleCoord - scale * vCoord.xy; + sampleFarLeft = vec3(base * farLeft.z + scale * farLeft.xy, farLeft.z); + sampleNearLeft = vec3(base * nearLeft.z + scale * nearLeft.xy, nearLeft.z); + sampleNearRight = vec3(base * nearRight.z + scale * nearRight.xy, nearRight.z); + sampleFarRight = vec3(base * farRight.z + scale * farRight.xy, farRight.z); +}
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