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Fix for aliasing in device-independent ovals on Nexus 10. 

Switch to using two attributes so that dFdx and dFdy generate valid results.

R=robertphillips@google.com

Author: jvanverth@google.com

Review URL: https://chromiumcodereview.appspot.com/23992005

git-svn-id: http://skia.googlecode.com/svn/trunk@11137 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
commit-bot@chromium.org 2013-09-06 19:46:48 +00:00
Родитель 6485b0be74
Коммит 96a7a9623f
1 изменённых файлов: 24 добавлений и 14 удалений
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38
src/gpu/GrOvalRenderer.cpp
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@ -362,21 +362,27 @@ public:
SkAssertResult(builder->enableFeature(
GrGLShaderBuilder::kStandardDerivatives_GLSLFeature));
const char *vsOffsetName, *fsOffsetName;
vertexBuilder->addVarying(kVec4f_GrSLType, "EllipseOffsets",
&vsOffsetName, &fsOffsetName);
const char *vsOffsetName0, *fsOffsetName0;
vertexBuilder->addVarying(kVec2f_GrSLType, "EllipseOffsets0",
&vsOffsetName0, &fsOffsetName0);
const SkString* attr0Name =
vertexBuilder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]);
vertexBuilder->vsCodeAppendf("\t%s = %s;\n", vsOffsetName, attr0Name->c_str());
vertexBuilder->vsCodeAppendf("\t%s = %s;\n", vsOffsetName0, attr0Name->c_str());
const char *vsOffsetName1, *fsOffsetName1;
vertexBuilder->addVarying(kVec2f_GrSLType, "EllipseOffsets1",
&vsOffsetName1, &fsOffsetName1);
const SkString* attr1Name =
vertexBuilder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[1]);
vertexBuilder->vsCodeAppendf("\t%s = %s;\n", vsOffsetName1, attr1Name->c_str());
// for outer curve
builder->fsCodeAppendf("\tvec2 scaledOffset = %s.xy;\n", fsOffsetName);
builder->fsCodeAppendf("\tvec2 scaledOffset = %s.xy;\n", fsOffsetName0);
builder->fsCodeAppend("\tfloat test = dot(scaledOffset, scaledOffset) - 1.0;\n");
builder->fsCodeAppendf("\tvec4 duvdx = dFdx(%s);\n", fsOffsetName);
builder->fsCodeAppendf("\tvec4 duvdy = dFdy(%s);\n", fsOffsetName);
builder->fsCodeAppendf("\tvec2 duvdx = dFdx(%s);\n", fsOffsetName0);
builder->fsCodeAppendf("\tvec2 duvdy = dFdy(%s);\n", fsOffsetName0);
builder->fsCodeAppendf("\tvec2 grad = vec2(2.0*%s.x*duvdx.x + 2.0*%s.y*duvdx.y,\n"
"\t 2.0*%s.x*duvdy.x + 2.0*%s.y*duvdy.y);\n",
fsOffsetName, fsOffsetName, fsOffsetName, fsOffsetName);
fsOffsetName0, fsOffsetName0, fsOffsetName0, fsOffsetName0);
builder->fsCodeAppend("\tfloat grad_dot = dot(grad, grad);\n");
// we need to clamp the length^2 of the gradiant vector to a non-zero value, because
@ -394,11 +400,13 @@ public:
// for inner curve
if (kStroke == ellipseEffect.getMode()) {
builder->fsCodeAppendf("\tscaledOffset = %s.zw;\n", fsOffsetName);
builder->fsCodeAppendf("\tscaledOffset = %s.xy;\n", fsOffsetName1);
builder->fsCodeAppend("\ttest = dot(scaledOffset, scaledOffset) - 1.0;\n");
builder->fsCodeAppendf("\tgrad = vec2(2.0*%s.z*duvdx.z + 2.0*%s.w*duvdx.w,\n"
"\t 2.0*%s.z*duvdy.z + 2.0*%s.w*duvdy.w);\n",
fsOffsetName, fsOffsetName, fsOffsetName, fsOffsetName);
builder->fsCodeAppendf("\tduvdx = dFdx(%s);\n", fsOffsetName1);
builder->fsCodeAppendf("\tduvdy = dFdy(%s);\n", fsOffsetName1);
builder->fsCodeAppendf("\tgrad = vec2(2.0*%s.x*duvdx.x + 2.0*%s.y*duvdx.y,\n"
"\t 2.0*%s.x*duvdy.x + 2.0*%s.y*duvdy.y);\n",
fsOffsetName1, fsOffsetName1, fsOffsetName1, fsOffsetName1);
builder->fsCodeAppend("\tinvlen = inversesqrt(dot(grad, grad));\n");
builder->fsCodeAppend("\tedgeAlpha *= clamp(0.5+test*invlen, 0.0, 1.0);\n");
}
@ -423,7 +431,8 @@ public:
private:
DIEllipseEdgeEffect(Mode mode) : GrEffect() {
this->addVertexAttrib(kVec4f_GrSLType);
this->addVertexAttrib(kVec2f_GrSLType);
this->addVertexAttrib(kVec2f_GrSLType);
fMode = mode;
}
@ -589,7 +598,8 @@ extern const GrVertexAttrib gEllipseVertexAttribs[] = {
// position + offsets
extern const GrVertexAttrib gDIEllipseVertexAttribs[] = {
{kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding},
{kVec4f_GrVertexAttribType, sizeof(GrPoint), kEffect_GrVertexAttribBinding},
{kVec2f_GrVertexAttribType, sizeof(GrPoint), kEffect_GrVertexAttribBinding},
{kVec2f_GrVertexAttribType, 2*sizeof(GrPoint), kEffect_GrVertexAttribBinding},
};
bool GrOvalRenderer::drawEllipse(GrDrawTarget* target,