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/*
* Copyright 2019 Google LLC.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm/gm.h"
#include "include/core/SkBitmap.h"
#include "include/core/SkFont.h"
#include "include/effects/SkRuntimeEffect.h"
#include "src/core/SkCanvasPriv.h"
#include "src/gpu/ganesh/GrCanvas.h"
#include "src/gpu/ganesh/GrDirectContextPriv.h"
#include "src/gpu/ganesh/GrPaint.h"
#include "src/gpu/ganesh/SkGr.h"
#include "src/gpu/ganesh/SurfaceDrawContext.h"
#include "src/gpu/ganesh/effects/GrMatrixEffect.h"
#include "src/gpu/ganesh/effects/GrTextureEffect.h"
#include "src/gpu/ganesh/glsl/GrGLSLFragmentShaderBuilder.h"
#include "tools/ToolUtils.h"
#include "tools/fonts/FontToolUtils.h"
namespace {
// Samples child with a uniform matrix (functionally identical to GrMatrixEffect)
// Scales along Y
class UniformMatrixEffect : public GrFragmentProcessor {
public:
inline static constexpr GrProcessor::ClassID CLASS_ID = (GrProcessor::ClassID) 4;
UniformMatrixEffect(std::unique_ptr<GrFragmentProcessor> child)
: GrFragmentProcessor(CLASS_ID, kNone_OptimizationFlags) {
this->registerChild(std::move(child),
SkSL::SampleUsage::UniformMatrix(/*hasPerspective=*/false));
}
const char* name() const override { return "UniformMatrixEffect"; }
void onAddToKey(const GrShaderCaps&, skgpu::KeyBuilder*) const override {}
bool onIsEqual(const GrFragmentProcessor& that) const override { return this == &that; }
std::unique_ptr<GrFragmentProcessor> clone() const override { return nullptr; }
std::unique_ptr<ProgramImpl> onMakeProgramImpl() const override {
class Impl : public ProgramImpl {
public:
void emitCode(EmitArgs& args) override {
fMatrixVar =
args.fUniformHandler->addUniform(&args.fFp,
kFragment_GrShaderFlag,
SkSLType::kFloat3x3,
SkSL::SampleUsage::MatrixUniformName());
SkString sample = this->invokeChildWithMatrix(0, args);
args.fFragBuilder->codeAppendf("return %s;\n", sample.c_str());
}
private:
void onSetData(const GrGLSLProgramDataManager& pdman,
const GrFragmentProcessor& proc) override {
pdman.setSkMatrix(fMatrixVar, SkMatrix::Scale(1, 0.5f));
}
UniformHandle fMatrixVar;
};
return std::make_unique<Impl>();
}
};
// Samples child with explicit coords
// Translates along Y
class ExplicitCoordEffect : public GrFragmentProcessor {
public:
inline static constexpr GrProcessor::ClassID CLASS_ID = (GrProcessor::ClassID) 6;
ExplicitCoordEffect(std::unique_ptr<GrFragmentProcessor> child)
: GrFragmentProcessor(CLASS_ID, kNone_OptimizationFlags) {
this->registerChild(std::move(child), SkSL::SampleUsage::Explicit());
this->setUsesSampleCoordsDirectly();
}
const char* name() const override { return "ExplicitCoordEffect"; }
void onAddToKey(const GrShaderCaps&, skgpu::KeyBuilder*) const override {}
bool onIsEqual(const GrFragmentProcessor& that) const override { return this == &that; }
std::unique_ptr<GrFragmentProcessor> clone() const override { return nullptr; }
std::unique_ptr<ProgramImpl> onMakeProgramImpl() const override {
class Impl : public ProgramImpl {
public:
void emitCode(EmitArgs& args) override {
args.fFragBuilder->codeAppendf("float2 coord = %s + float2(0, 8);",
args.fSampleCoord);
SkString sample = this->invokeChild(0, args, "coord");
args.fFragBuilder->codeAppendf("return %s;\n", sample.c_str());
}
};
return std::make_unique<Impl>();
}
};
// Generates test pattern
class TestPatternEffect : public GrFragmentProcessor {
public:
inline static constexpr GrProcessor::ClassID CLASS_ID = (GrProcessor::ClassID) 7;
TestPatternEffect() : GrFragmentProcessor(CLASS_ID, kNone_OptimizationFlags) {
this->setUsesSampleCoordsDirectly();
}
const char* name() const override { return "TestPatternEffect"; }
void onAddToKey(const GrShaderCaps&, skgpu::KeyBuilder*) const override {}
bool onIsEqual(const GrFragmentProcessor& that) const override { return this == &that; }
std::unique_ptr<GrFragmentProcessor> clone() const override { return nullptr; }
std::unique_ptr<ProgramImpl> onMakeProgramImpl() const override {
class Impl : public ProgramImpl {
public:
void emitCode(EmitArgs& args) override {
auto fb = args.fFragBuilder;
fb->codeAppendf("float2 coord = %s / 64.0;", args.fSampleCoord);
fb->codeAppendf("coord = floor(coord * 4) / 3;");
fb->codeAppendf("return half2(coord).rg01;\n");
}
};
return std::make_unique<Impl>();
}
};
SkBitmap make_test_bitmap() {
SkBitmap bitmap;
bitmap.allocN32Pixels(64, 64);
SkCanvas canvas(bitmap);
SkFont font = ToolUtils::DefaultPortableFont();
const char* alpha = "ABCDEFGHIJKLMNOP";
for (int i = 0; i < 16; ++i) {
int tx = i % 4,
ty = i / 4;
int x = tx * 16,
y = ty * 16;
SkPaint paint;
paint.setColor4f({ tx / 3.0f, ty / 3.0f, 0.0f, 1.0f });
canvas.drawRect(SkRect::MakeXYWH(x, y, 16, 16), paint);
paint.setColor4f({ (3-tx) / 3.0f, (3-ty)/3.0f, 1.0f, 1.0f });
canvas.drawSimpleText(alpha + i, 1, SkTextEncoding::kUTF8, x + 3, y + 13, font, paint);
}
return bitmap;
}
enum EffectType {
kUniform,
kExplicit,
kDevice,
};
static std::unique_ptr<GrFragmentProcessor> wrap(std::unique_ptr<GrFragmentProcessor> fp,
EffectType effectType,
int drawX, int drawY) {
switch (effectType) {
case kUniform:
return std::make_unique<UniformMatrixEffect>(std::move(fp));
case kExplicit:
return std::make_unique<ExplicitCoordEffect>(std::move(fp));
case kDevice:
// Subtract out upper-left corner of draw so that device is effectively identity.
fp = GrMatrixEffect::Make(SkMatrix::Translate(-drawX, -drawY), std::move(fp));
return GrFragmentProcessor::DeviceSpace(std::move(fp));
}
SkUNREACHABLE;
}
} // namespace
namespace skiagm {
DEF_SIMPLE_GPU_GM_CAN_FAIL(fp_sample_chaining, rContext, canvas, errorMsg, 232, 306) {
auto sdc = skgpu::ganesh::TopDeviceSurfaceDrawContext(canvas);
if (!sdc) {
*errorMsg = GM::kErrorMsg_DrawSkippedGpuOnly;
return DrawResult::kSkip;
}
SkBitmap bmp = make_test_bitmap();
int x = 10, y = 10;
auto nextCol = [&] { x += (64 + 10); };
auto nextRow = [&] { x = 10; y += (64 + 10); };
auto draw = [&](std::initializer_list<EffectType> effects) {
// Enable TestPatternEffect to get a fully procedural inner effect. It's not quite as nice
// visually (no text labels in each box), but it avoids the extra GrMatrixEffect.
// Switching it on actually triggers *more* shader compilation failures.
#if 0
auto fp = std::unique_ptr<GrFragmentProcessor>(new TestPatternEffect());
#else
auto view = std::get<0>(GrMakeCachedBitmapProxyView(
rContext, bmp, /*label=*/"FpSampleChaining", skgpu::Mipmapped::kNo));
auto fp = GrTextureEffect::Make(std::move(view), bmp.alphaType());
#endif
for (EffectType effectType : effects) {
fp = wrap(std::move(fp), effectType, x, y);
}
GrPaint paint;
paint.setColorFragmentProcessor(std::move(fp));
sdc->drawRect(nullptr, std::move(paint), GrAA::kNo, SkMatrix::Translate(x, y),
SkRect::MakeIWH(64, 64));
nextCol();
};
// Reminder, in every case, the chain is more complicated than it seems, because the
// GrTextureEffect is wrapped in a GrMatrixEffect, which is subject to the same bugs that
// we're testing (particularly the bug about owner/base in UniformMatrixEffect).
// First row: no transform, then each one independently applied
draw({}); // Identity (4 rows and columns)
draw({ kUniform }); // Scale Y axis by 2x (2 visible rows)
draw({ kExplicit }); // Translate up by 8px
nextRow();
// Second row: transform duplicated
draw({ kUniform, kUniform }); // Scale Y axis by 4x (1 visible row)
draw({ kExplicit, kExplicit }); // Translate up by 16px
nextRow();
// Third row: Remember, these are applied inside out:
draw({ kUniform, kExplicit }); // Scale Y by 2x and translate up by 8px
draw({ kExplicit, kUniform }); // Scale Y by 2x and translate up by 16px
nextRow();
// Fourth row: device space.
draw({ kDevice, kUniform }); // Same as identity (uniform applied *before*
// device so ignored).
draw({ kExplicit, kUniform, kDevice }); // Scale Y by 2x and translate up by 16px
draw({ kDevice, kExplicit, kUniform, kDevice }); // Identity, again.
return DrawResult::kOk;
}
} // namespace skiagm