Automatically handle converting gl_FragCoord to Skia's y-down device coords.
NOTE: THIS WILL LIKELY REQUIRE GM REBASELINING.
R=robertphillips@google.com,senorblanco@chromium.org
Review URL: https://codereview.appspot.com/6744061
git-svn-id: http://skia.googlecode.com/svn/trunk@6030 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/GrGLProgram.cpp b/src/gpu/gl/GrGLProgram.cpp
index 066da35..8824114 100644
--- a/src/gpu/gl/GrGLProgram.cpp
+++ b/src/gpu/gl/GrGLProgram.cpp
@@ -77,6 +77,7 @@
fViewportSize.set(-1, -1);
fColor = GrColor_ILLEGAL;
fColorFilterColor = GrColor_ILLEGAL;
+ fRTHeight = -1;
for (int s = 0; s < GrDrawState::kNumStages; ++s) {
fProgramStage[s] = NULL;
@@ -234,56 +235,57 @@
}
bool GrGLProgram::genEdgeCoverage(SkString* coverageVar,
- GrGLShaderBuilder* segments) const {
+ GrGLShaderBuilder* builder) const {
if (fDesc.fVertexLayout & GrDrawTarget::kEdge_VertexLayoutBit) {
const char *vsName, *fsName;
- segments->addVarying(kVec4f_GrSLType, "Edge", &vsName, &fsName);
- segments->fVSAttrs.push_back().set(kVec4f_GrSLType,
- GrGLShaderVar::kAttribute_TypeModifier, EDGE_ATTR_NAME);
- segments->fVSCode.appendf("\t%s = " EDGE_ATTR_NAME ";\n", vsName);
+ builder->addVarying(kVec4f_GrSLType, "Edge", &vsName, &fsName);
+ builder->fVSAttrs.push_back().set(kVec4f_GrSLType,
+ GrGLShaderVar::kAttribute_TypeModifier,
+ EDGE_ATTR_NAME);
+ builder->fVSCode.appendf("\t%s = " EDGE_ATTR_NAME ";\n", vsName);
switch (fDesc.fVertexEdgeType) {
case GrDrawState::kHairLine_EdgeType:
- 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");
+ builder->fFSCode.appendf("\tfloat edgeAlpha = abs(dot(vec3(%s.xy,1), %s.xyz));\n", builder->fragmentPosition(), fsName);
+ builder->fFSCode.append("\tedgeAlpha = max(1.0 - edgeAlpha, 0.0);\n");
break;
case GrDrawState::kQuad_EdgeType:
- segments->fFSCode.append("\tfloat edgeAlpha;\n");
+ builder->fFSCode.append("\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);
+ builder->fFSCode.appendf("\tvec2 duvdx = dFdx(%s.xy);\n", fsName);
+ builder->fFSCode.appendf("\tvec2 duvdy = dFdy(%s.xy);\n", fsName);
+ builder->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.append("\t\tedgeAlpha = clamp(0.5 - edgeAlpha / length(gF), 0.0, 1.0);\n"
- "\t}\n");
+ builder->fFSCode.appendf("\t\tedgeAlpha = min(min(%s.z, %s.w) + 0.5, 1.0);\n", fsName, fsName);
+ builder->fFSCode.append ("\t} else {\n");
+ builder->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);
+ builder->fFSCode.appendf("\t\tedgeAlpha = (%s.x*%s.x - %s.y);\n", fsName, fsName, fsName);
+ builder->fFSCode.append("\t\tedgeAlpha = clamp(0.5 - edgeAlpha / length(gF), 0.0, 1.0);\n"
+ "\t}\n");
if (kES2_GrGLBinding == fContextInfo.binding()) {
- segments->fHeader.printf("#extension GL_OES_standard_derivatives: enable\n");
+ builder->fHeader.printf("#extension GL_OES_standard_derivatives: enable\n");
}
break;
case GrDrawState::kHairQuad_EdgeType:
- 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);
- segments->fFSCode.append("\tedgeAlpha = sqrt(edgeAlpha*edgeAlpha / dot(gF, gF));\n");
- segments->fFSCode.append("\tedgeAlpha = max(1.0 - edgeAlpha, 0.0);\n");
+ builder->fFSCode.appendf("\tvec2 duvdx = dFdx(%s.xy);\n", fsName);
+ builder->fFSCode.appendf("\tvec2 duvdy = dFdy(%s.xy);\n", fsName);
+ builder->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);
+ builder->fFSCode.appendf("\tfloat edgeAlpha = (%s.x*%s.x - %s.y);\n", fsName, fsName, fsName);
+ builder->fFSCode.append("\tedgeAlpha = sqrt(edgeAlpha*edgeAlpha / dot(gF, gF));\n");
+ builder->fFSCode.append("\tedgeAlpha = max(1.0 - edgeAlpha, 0.0);\n");
if (kES2_GrGLBinding == fContextInfo.binding()) {
- segments->fHeader.printf("#extension GL_OES_standard_derivatives: enable\n");
+ builder->fHeader.printf("#extension GL_OES_standard_derivatives: enable\n");
}
break;
case GrDrawState::kCircle_EdgeType:
- segments->fFSCode.append("\tfloat edgeAlpha;\n");
- segments->fFSCode.appendf("\tfloat d = distance(gl_FragCoord.xy, %s.xy);\n", fsName);
- segments->fFSCode.appendf("\tfloat outerAlpha = smoothstep(d - 0.5, d + 0.5, %s.z);\n", fsName);
- segments->fFSCode.appendf("\tfloat innerAlpha = %s.w == 0.0 ? 1.0 : smoothstep(%s.w - 0.5, %s.w + 0.5, d);\n", fsName, fsName, fsName);
- segments->fFSCode.append("\tedgeAlpha = outerAlpha * innerAlpha;\n");
+ builder->fFSCode.append("\tfloat edgeAlpha;\n");
+ builder->fFSCode.appendf("\tfloat d = distance(%s.xy, %s.xy);\n", builder->fragmentPosition(), fsName);
+ builder->fFSCode.appendf("\tfloat outerAlpha = smoothstep(d - 0.5, d + 0.5, %s.z);\n", fsName);
+ builder->fFSCode.appendf("\tfloat innerAlpha = %s.w == 0.0 ? 1.0 : smoothstep(%s.w - 0.5, %s.w + 0.5, d);\n", fsName, fsName, fsName);
+ builder->fFSCode.append("\tedgeAlpha = outerAlpha * innerAlpha;\n");
break;
default:
GrCrash("Unknown Edge Type!");
@@ -807,6 +809,7 @@
builder.finished(fProgramID);
this->initSamplerUniforms();
+ fUniforms.fRTHeight = builder.getRTHeightUniform();
return true;
}
@@ -964,7 +967,13 @@
return glStage;
}
-void GrGLProgram::setData(const GrDrawState& drawState) const {
+void GrGLProgram::setData(const GrDrawState& drawState) {
+ int rtHeight = drawState.getRenderTarget()->height();
+ if (GrGLUniformManager::kInvalidUniformHandle != fUniforms.fRTHeight &&
+ rtHeight != fRTHeight) {
+ fUniformManager.set1f(fUniforms.fRTHeight, GrIntToScalar(rtHeight));
+ fRTHeight = rtHeight;
+ }
for (int s = 0; s < GrDrawState::kNumStages; ++s) {
if (NULL != fProgramStage[s]) {
const GrSamplerState& sampler = drawState.getSampler(s);