Create new target to hold gpu test code, enable direct testing of GrEffects in GM.
R=robertphillips@google.com, jvanverth@google.com, egdaniel@google.com
Author: bsalomon@google.com
Review URL: https://chromiumcodereview.appspot.com/23352003
git-svn-id: http://skia.googlecode.com/svn/trunk@10866 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gm/beziereffects.cpp b/gm/beziereffects.cpp
new file mode 100644
index 0000000..60474da
--- /dev/null
+++ b/gm/beziereffects.cpp
@@ -0,0 +1,179 @@
+
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+// This test only works with the GPU backend.
+
+#include "gm.h"
+
+#if SK_SUPPORT_GPU && 0 // Can be enabled when cubic effect is checked in.
+
+#include "GrContext.h"
+#include "GrPathUtils.h"
+#include "GrTest.h"
+#include "SkColorPriv.h"
+#include "SkDevice.h"
+
+// Position & KLM line eq values. These are the vertex attributes for Bezier curves. The last value
+// of the Vec4f is ignored.
+extern const GrVertexAttrib kAttribs[] = {
+ {kVec2f_GrVertexAttribType, 0, kPosition_GrVertexAttribBinding},
+ {kVec4f_GrVertexAttribType, sizeof(GrPoint), kEffect_GrVertexAttribBinding}
+};
+
+static inline SkScalar eval_line(const SkPoint& p, const SkScalar lineEq[3], SkScalar sign) {
+ return sign * (lineEq[0] * p.fX + lineEq[1] * p.fY + lineEq[2]);
+}
+
+namespace skiagm {
+/**
+ * This GM directly exercises effects that draw Bezier curves in the GPU backend.
+ */
+class BezierEffects : public GM {
+public:
+ BezierEffects() {
+ this->setBGColor(0xFFFFFFFF);
+ }
+
+protected:
+ virtual SkString onShortName() SK_OVERRIDE {
+ return SkString("bezier_effects");
+ }
+
+ virtual SkISize onISize() SK_OVERRIDE {
+ return make_isize(800, 800);
+ }
+
+ virtual uint32_t onGetFlags() const SK_OVERRIDE {
+ // This is a GPU-specific GM.
+ return kGPUOnly_Flag;
+ }
+
+
+ virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
+ SkDevice* device = canvas->getTopDevice();
+ GrRenderTarget* rt = device->accessRenderTarget();
+ if (NULL == rt) {
+ return;
+ }
+ GrContext* context = rt->getContext();
+ if (NULL == context) {
+ return;
+ }
+
+ struct Vertex {
+ SkPoint fPosition;
+ float fKLM[4]; // The last value is ignored. The effect expects a vec4f.
+ };
+
+ static const int kNumCubics = 10;
+ SkMWCRandom rand;
+
+ int numCols = SkScalarCeilToInt(SkScalarSqrt(SkIntToScalar(kNumCubics)));
+ int numRows = SkScalarCeilToInt(SkIntToScalar(kNumCubics) / numCols);
+ SkScalar w = SkIntToScalar(rt->width()) / numCols;
+ SkScalar h = SkIntToScalar(rt->height()) / numRows;
+ int row = 0;
+ int col = 0;
+
+ for (int i = 0; i < kNumCubics; ++i) {
+ SkScalar x = SkScalarMul(col, w);
+ SkScalar y = SkScalarMul(row, h);
+ SkPoint controlPts[] = {
+ {x + rand.nextRangeF(0, w), y + rand.nextRangeF(0, h)},
+ {x + rand.nextRangeF(0, w), y + rand.nextRangeF(0, h)},
+ {x + rand.nextRangeF(0, w), y + rand.nextRangeF(0, h)},
+ {x + rand.nextRangeF(0, w), y + rand.nextRangeF(0, h)}
+ };
+ SkPoint chopped[10];
+ SkScalar klmEqs[9];
+ SkScalar klmSigns[3];
+ int cnt = GrPathUtils::chopCubicAtLoopIntersection(controlPts,
+ chopped,
+ klmEqs,
+ klmSigns,
+ controlPts);
+
+ SkPaint ctrlPtPaint;
+ ctrlPtPaint.setColor(rand.nextU() | 0xFF000000);
+ for (int i = 0; i < 4; ++i) {
+ canvas->drawCircle(controlPts[i].fX, controlPts[i].fY, 6.f, ctrlPtPaint);
+ }
+
+ SkPaint polyPaint;
+ polyPaint.setColor(0xffA0A0A0);
+ polyPaint.setStrokeWidth(0);
+ polyPaint.setStyle(SkPaint::kStroke_Style);
+ canvas->drawPoints(SkCanvas::kPolygon_PointMode, 4, controlPts, polyPaint);
+
+ SkPaint choppedPtPaint;
+ choppedPtPaint.setColor(~ctrlPtPaint.getColor() | 0xFF000000);
+
+ for (int c = 0; c < cnt; ++c) {
+ SkPoint* pts = chopped + 3 * c;
+
+ for (int i = 0; i < 4; ++i) {
+ canvas->drawCircle(pts[i].fX, pts[i].fY, 3.f, choppedPtPaint);
+ }
+
+ SkRect bounds;
+ bounds.set(pts, 4);
+
+ SkPaint boundsPaint;
+ boundsPaint.setColor(0xff808080);
+ boundsPaint.setStrokeWidth(0);
+ boundsPaint.setStyle(SkPaint::kStroke_Style);
+ canvas->drawRect(bounds, boundsPaint);
+
+ Vertex verts[4];
+ verts[0].fPosition.setRectFan(bounds.fLeft, bounds.fTop,
+ bounds.fRight, bounds.fBottom,
+ sizeof(Vertex));
+ for (int v = 0; v < 4; ++v) {
+ verts[v].fKLM[0] = eval_line(verts[v].fPosition, klmEqs + 0, klmSigns[c]);
+ verts[v].fKLM[1] = eval_line(verts[v].fPosition, klmEqs + 3, klmSigns[c]);
+ verts[v].fKLM[2] = eval_line(verts[v].fPosition, klmEqs + 6, 1.f);
+ }
+
+ GrTestTarget tt;
+ context->getTestTarget(&tt);
+ if (NULL == tt.target()) {
+ continue;
+ }
+ GrDrawState* drawState = tt.target()->drawState();
+ drawState->setVertexAttribs<kAttribs>(2);
+ SkAutoTUnref<GrEffectRef> effect(HairCubicEdgeEffect::Create());
+ if (!effect) {
+ continue;
+ }
+ drawState->addCoverageEffect(effect, 1);
+ drawState->setRenderTarget(rt);
+ drawState->setColor(0xff000000);
+
+ tt.target()->setVertexSourceToArray(verts, 4);
+ tt.target()->setIndexSourceToBuffer(context->getQuadIndexBuffer());
+ tt.target()->drawIndexed(kTriangleFan_GrPrimitiveType, 0, 0, 4, 6);
+ }
+ ++col;
+ if (numCols == col) {
+ col = 0;
+ ++row;
+ }
+ }
+ }
+
+private:
+ typedef GM INHERITED;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+
+DEF_GM( return SkNEW(BezierEffects); )
+
+}
+
+#endif