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Update Alligned Rect Shader to match geometry version

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-Also update to combine width and height coverage using multiplication
 instead of using min

R=bsalomon@google.com, robertphillips@google.com

Author: egdaniel@google.com

Review URL: https://chromiumcodereview.appspot.com/16854012

git-svn-id: http://skia.googlecode.com/svn/trunk@9609 2bbb7eff-a529-9590-31e7-b0007b416f81
This commit is contained in:
commit-bot@chromium.org 2013-06-14 14:58:50 +00:00
parent 459104ceea
commit 99e0d08113
1 changed files with 19 additions and 14 deletions
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29
src/gpu/GrAARectRenderer.cpp
View File

@ -59,23 +59,28 @@ public:
builder->getEffectAttributeName(drawEffect.getVertexAttribIndices()[0]);
builder->vsCodeAppendf("\t%s = %s;\n", vsRectName, attr0Name->c_str());
// TODO: compute these scale factors in the VS
// These scale factors adjust the coverage for < 1 pixel wide/high rects
builder->fsCodeAppendf("\tfloat wScale = max(1.0, 2.0/(0.5+%s.z));\n",
fsRectName);
builder->fsCodeAppendf("\tfloat hScale = max(1.0, 2.0/(0.5+%s.w));\n",
fsRectName);
// TODO: compute all these offsets, spans, and scales in the VS
builder->fsCodeAppendf("\tfloat insetW = min(1.0, %s.z) - 0.5;\n", fsRectName);
builder->fsCodeAppendf("\tfloat insetH = min(1.0, %s.w) - 0.5;\n", fsRectName);
builder->fsCodeAppend("\tfloat outset = 0.5;\n");
// For rects > 1 pixel wide and tall the span's are noops (i.e., 1.0). For rects
// < 1 pixel wide or tall they serve to normalize the < 1 ramp to a 0 .. 1 range.
builder->fsCodeAppend("\tfloat spanW = insetW + outset;\n");
builder->fsCodeAppend("\tfloat spanH = insetH + outset;\n");
// For rects < 1 pixel wide or tall, these scale factors are used to cap the maximum
// value of coverage that is used. In other words it is the coverage that is
// used in the interior of the rect after the ramp.
builder->fsCodeAppend("\tfloat scaleW = min(1.0, 2*insetW/spanW);\n");
builder->fsCodeAppend("\tfloat scaleH = min(1.0, 2*insetH/spanH);\n");
// Compute the coverage for the rect's width
builder->fsCodeAppendf("\tfloat coverage = clamp(wScale*(%s.z-abs(%s.x)), 0.0, 1.0);\n",
fsRectName,
builder->fsCodeAppendf(
"\tfloat coverage = scaleW*clamp((%s.z-abs(%s.x))/spanW, 0.0, 1.0);\n", fsRectName,
fsRectName);
// Compute the coverage for the rect's height and merge with the width
builder->fsCodeAppendf(
"\tcoverage = min(coverage, clamp(hScale*(%s.w-abs(%s.y)), 0.0, 1.0));\n",
fsRectName,
fsRectName);
"\tcoverage = coverage*scaleH*clamp((%s.w-abs(%s.y))/spanH, 0.0, 1.0);\n",
fsRectName, fsRectName);
SkString modulate;
GrGLSLModulatef<4>(&modulate, inputColor, "coverage");