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Fetch and transform fewer vertices in the ECAA cover shader

This commit is contained in:
Patrick Walton 2017-10-05 13:30:32 -07:00
parent d4c7fa74bd
commit 28837f72a6
1 changed files with 5 additions and 18 deletions
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23
shaders/gles2/ecaa-cover.vs.glsl
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@ -29,7 +29,6 @@ varying vec2 vHorizontalExtents;
void main() {
// Fetch B-vertex positions.
// FIXME(pcwalton): This could be slightly optimized to fetch fewer positions.
ivec4 pointIndices = ivec4(unpackUInt32Attribute(aUpperPointIndices.xy),
unpackUInt32Attribute(aUpperPointIndices.zw),
unpackUInt32Attribute(aLowerPointIndices.xy),
@ -47,44 +46,32 @@ void main() {
pointIndices.w,
uBVertexPositionDimensions);
upperLeftPosition.y = min(upperLeftPosition.y, upperRightPosition.y);
lowerRightPosition.y = max(lowerLeftPosition.y, lowerRightPosition.y);
int pathID = fetchUInt16Data(uBVertexPathID, pointIndices.x, uBVertexPathIDDimensions);
vec4 hints = fetchFloat4Data(uPathHints, pathID, uPathHintsDimensions);
vec4 transform = fetchFloat4Data(uPathTransform, pathID, uPathTransformDimensions);
upperLeftPosition = hintPosition(upperLeftPosition, hints);
upperRightPosition = hintPosition(upperRightPosition, hints);
lowerLeftPosition = hintPosition(lowerLeftPosition, hints);
lowerRightPosition = hintPosition(lowerRightPosition, hints);
upperLeftPosition = transformVertexPositionST(upperLeftPosition, transform);
upperRightPosition = transformVertexPositionST(upperRightPosition, transform);
lowerLeftPosition = transformVertexPositionST(lowerLeftPosition, transform);
lowerRightPosition = transformVertexPositionST(lowerRightPosition, transform);
upperLeftPosition = transformVertexPositionST(upperLeftPosition, uTransformST);
upperRightPosition = transformVertexPositionST(upperRightPosition, uTransformST);
lowerLeftPosition = transformVertexPositionST(lowerLeftPosition, uTransformST);
lowerRightPosition = transformVertexPositionST(lowerRightPosition, uTransformST);
upperLeftPosition = convertClipToScreenSpace(upperLeftPosition, uFramebufferSize);
upperRightPosition = convertClipToScreenSpace(upperRightPosition, uFramebufferSize);
lowerLeftPosition = convertClipToScreenSpace(lowerLeftPosition, uFramebufferSize);
lowerRightPosition = convertClipToScreenSpace(lowerRightPosition, uFramebufferSize);
vec4 extents = vec4(min(upperLeftPosition.x, lowerLeftPosition.x),
min(min(upperLeftPosition.y, upperRightPosition.y),
min(lowerLeftPosition.y, lowerRightPosition.y)),
max(upperRightPosition.x, lowerRightPosition.x),
max(max(upperLeftPosition.y, upperRightPosition.y),
max(lowerLeftPosition.y, lowerRightPosition.y)));
vec4 roundedExtents = vec4(floor(extents.xy), ceil(extents.zw));
vec4 roundedExtents = vec4(floor(upperLeftPosition), ceil(lowerRightPosition));
vec2 position = mix(roundedExtents.xy, roundedExtents.zw, aQuadPosition);
position = convertScreenToClipSpace(position, uFramebufferSize);
float depth = convertPathIndexToViewportDepthValue(pathID);
gl_Position = vec4(position, depth, 1.0);
vHorizontalExtents = extents.xz;
vHorizontalExtents = vec2(upperLeftPosition.x, lowerRightPosition.x);
}