fix interior issues in convex path renderer
git-svn-id: http://skia.googlecode.com/svn/trunk@3078 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/GrGLProgram.cpp b/src/gpu/GrGLProgram.cpp
index ce5a284..610446d 100644
--- a/src/gpu/GrGLProgram.cpp
+++ b/src/gpu/GrGLProgram.cpp
@@ -528,23 +528,34 @@
if (GrDrawState::kHairLine_EdgeType == fProgramDesc.fVertexEdgeType) {
segments->fFSCode.appendf("\tfloat edgeAlpha = abs(dot(vec3(gl_FragCoord.xy,1), %s.xyz));\n", fsName);
segments->fFSCode.append("\tedgeAlpha = max(1.0 - edgeAlpha, 0.0);\n");
+ } else if (GrDrawState::kQuad_EdgeType == fProgramDesc.fVertexEdgeType) {
+ segments->fFSCode.appendf("\tfloat edgeAlpha;\n");
+ // keep the derivative instructions outside the conditional
+ segments->fFSCode.appendf("\tvec2 duvdx = dFdx(%s.xy);\n", fsName);
+ segments->fFSCode.appendf("\tvec2 duvdy = dFdy(%s.xy);\n", fsName);
+ segments->fFSCode.appendf("\tif (%s.z > 0.0 && %s.w > 0.0) {\n", fsName, fsName);
+ // today we know z and w are in device space. We could use derivatives
+ segments->fFSCode.appendf("\t\tedgeAlpha = min(min(%s.z, %s.w) + 0.5, 1.0);\n", fsName, fsName);
+ segments->fFSCode.append ("\t} else {\n");
+ segments->fFSCode.appendf("\t\tvec2 gF = vec2(2.0*%s.x*duvdx.x - duvdx.y,\n"
+ "\t\t 2.0*%s.x*duvdy.x - duvdy.y);\n",
+ fsName, fsName);
+ segments->fFSCode.appendf("\t\tedgeAlpha = (%s.x*%s.x - %s.y);\n", fsName, fsName, fsName);
+ segments->fFSCode.appendf("\t\tedgeAlpha = clamp(0.5 - edgeAlpha / length(gF), 0.0, 1.0);\n"
+ "\t}\n");
+ if (gl->supportsES2()) {
+ segments->fHeader.printf("#extension GL_OES_standard_derivatives: enable\n");
+ }
} else {
- GrAssert(GrDrawState::kHairQuad_EdgeType == fProgramDesc.fVertexEdgeType ||
- GrDrawState::kQuad_EdgeType == fProgramDesc.fVertexEdgeType);
- // for now we know we're not in perspective, so we could compute this
- // per-quadratic rather than per pixel
+ GrAssert(GrDrawState::kHairQuad_EdgeType == fProgramDesc.fVertexEdgeType);
segments->fFSCode.appendf("\tvec2 duvdx = dFdx(%s.xy);\n", fsName);
segments->fFSCode.appendf("\tvec2 duvdy = dFdy(%s.xy);\n", fsName);
segments->fFSCode.appendf("\tvec2 gF = vec2(2.0*%s.x*duvdx.x - duvdx.y,\n"
"\t 2.0*%s.x*duvdy.x - duvdy.y);\n",
fsName, fsName);
segments->fFSCode.appendf("\tfloat edgeAlpha = (%s.x*%s.x - %s.y);\n", fsName, fsName, fsName);
- if (GrDrawState::kQuad_EdgeType == fProgramDesc.fVertexEdgeType) {
- segments->fFSCode.append("\tedgeAlpha = clamp(0.5 - edgeAlpha / length(gF), 0.0, 1.0);\n");
- } else {
- segments->fFSCode.append("\tedgeAlpha = sqrt(edgeAlpha*edgeAlpha / dot(gF, gF));\n");
- segments->fFSCode.append("\tedgeAlpha = max(1.0 - edgeAlpha, 0.0);\n");
- }
+ segments->fFSCode.append("\tedgeAlpha = sqrt(edgeAlpha*edgeAlpha / dot(gF, gF));\n");
+ segments->fFSCode.append("\tedgeAlpha = max(1.0 - edgeAlpha, 0.0);\n");
if (gl->supportsES2()) {
segments->fHeader.printf("#extension GL_OES_standard_derivatives: enable\n");
}