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/*
* Copyright 2021 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/SkBlender.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkCustomMesh.h"
#include "include/core/SkSurface.h"
#include "include/effects/SkGradientShader.h"
#include "src/core/SkCanvasPriv.h"
#include <memory>
namespace skiagm {
class CustomMeshGM : public skiagm::GM {
public:
CustomMeshGM() {}
protected:
using Attribute = SkCustomMeshSpecification::Attribute;
using Varying = SkCustomMeshSpecification::Varying;
SkISize onISize() override { return {435, 1180}; }
void onOnceBeforeDraw() override {
{
static const Attribute kAttributes[]{
{Attribute::Type::kFloat4, 8, SkString{"xuyv"}},
{Attribute::Type::kUByte4_unorm, 4, SkString{"brag"}},
};
static const Varying kVaryings[]{
{Varying::Type::kHalf4, SkString{"color"}},
{Varying::Type::kFloat2, SkString{"uv"} },
};
static constexpr char kVS[] = R"(
half4 unswizzle_color(half4 color) { return color.garb; }
float2 main(in Attributes attributes, out Varyings varyings) {
varyings.color = unswizzle_color(attributes.brag);
varyings.uv = attributes.xuyv.yw;
return attributes.xuyv.xz;
}
)";
static constexpr char kFS[] = R"(
float2 main(in Varyings varyings, out float4 color) {
color = varyings.color;
return varyings.uv;
}
)";
auto [spec, error] = SkCustomMeshSpecification::Make(
SkMakeSpan(kAttributes, SK_ARRAY_COUNT(kAttributes)),
sizeof(ColorVertex),
SkMakeSpan(kVaryings, SK_ARRAY_COUNT(kVaryings)),
SkString(kVS),
SkString(kFS));
if (!spec) {
SkDebugf("%s\n", error.c_str());
}
fSpecWithColor = std::move(spec);
}
{
static const Attribute kAttributes[]{
{Attribute::Type::kFloat4, 0, SkString{"xuyv"}},
};
static const Varying kVaryings[]{
{Varying::Type::kFloat2, SkString{"vux2"}},
};
static constexpr char kVS[] = R"(
float2 main(in Attributes a, out Varyings v) {
v.vux2 = 2*a.xuyv.wy;
return a.xuyv.xz;
}
)";
static constexpr char kFS[] = R"(
float2 helper(in float2 vux2) { return vux2.yx/2; }
float2 main(in Varyings varyings) {
return helper(varyings.vux2);
}
)";
auto [spec, error] = SkCustomMeshSpecification::Make(
SkMakeSpan(kAttributes, SK_ARRAY_COUNT(kAttributes)),
sizeof(NoColorVertex),
SkMakeSpan(kVaryings, SK_ARRAY_COUNT(kVaryings)),
SkString(kVS),
SkString(kFS));
if (!spec) {
SkDebugf("%s\n", error.c_str());
}
fSpecWithNoColor = std::move(spec);
}
static constexpr SkColor kColors[] = {SK_ColorTRANSPARENT, SK_ColorWHITE};
fShader = SkGradientShader::MakeRadial({10, 10},
3,
kColors,
nullptr,
2,
SkTileMode::kMirror);
}
SkString onShortName() override { return SkString("custommesh"); }
DrawResult onDraw(SkCanvas* canvas, SkString*) override {
int i = 0;
for (const sk_sp<SkBlender>& blender : {SkBlender::Mode(SkBlendMode::kDst),
SkBlender::Mode(SkBlendMode::kSrc),
SkBlender::Mode(SkBlendMode::kSaturation)}) {
canvas->save();
for (uint8_t alpha : {0xFF , 0x40})
for (bool colors : {false, true})
for (bool shader : {false, true}) {
SkCustomMesh cm;
cm.spec = colors ? fSpecWithColor : fSpecWithNoColor;
cm.bounds = kRect;
// Rather than pile onto the combinatorics we draw every other test case indexed.
if ((i & 1) == 0) {
cm.vb = colors ? static_cast<const void*>(kColorQuad)
: static_cast<const void*>(kNoColorQuad);
cm.vcount = 4;
cm.mode = SkCustomMesh::Mode::kTriangleStrip;
} else {
cm.vb = colors ? static_cast<const void*>(kColorIndexedQuad)
: static_cast<const void*>(kNoColorIndexedQuad);
cm.vcount = 6;
cm.icount = 6;
cm.indices = kIndices;
cm.mode = SkCustomMesh::Mode::kTriangles;
}
SkPaint paint;
paint.setColor(SK_ColorGREEN);
paint.setShader(shader ? fShader : nullptr);
paint.setAlpha(alpha);
SkCanvasPriv::DrawCustomMesh(canvas, std::move(cm), blender, paint);
canvas->translate(0, 150);
++i;
}
canvas->restore();
canvas->translate(150, 0);
}
return DrawResult::kOk;
}
private:
struct ColorVertex {
uint32_t pad;
uint32_t brag;
float xuyv[4];
};
struct NoColorVertex {
float xuyv[4];
};
static constexpr auto kRect = SkRect::MakeLTRB(20, 20, 120, 120);
static constexpr auto kUV = SkRect::MakeLTRB( 0, 0, 20, 20);
static constexpr ColorVertex kColorQuad[] {
{0, 0x00FFFF00, {kRect.left(), kUV.left(), kRect.top(), kUV.top() }},
{0, 0x00FFFFFF, {kRect.right(), kUV.right(), kRect.top(), kUV.top() }},
{0, 0xFFFF00FF, {kRect.left(), kUV.left(), kRect.bottom(), kUV.bottom()}},
{0, 0xFFFFFF00, {kRect.right(), kUV.right(), kRect.bottom(), kUV.bottom()}},
};
static constexpr NoColorVertex kNoColorQuad[]{
{{kRect.left(), kUV.left(), kRect.top(), kUV.top() }},
{{kRect.right(), kUV.right(), kRect.top(), kUV.top() }},
{{kRect.left(), kUV.left(), kRect.bottom(), kUV.bottom()}},
{{kRect.right(), kUV.right(), kRect.bottom(), kUV.bottom()}},
};
// The indexed quads draw the same as the non-indexed. They just have unused vertices that the
// index buffer skips over draw with triangles instead of a triangle strip.
static constexpr ColorVertex kColorIndexedQuad[] {
{0, 0x00FFFF00, {kRect.left(), kUV.left(), kRect.top(), kUV.top() }},
{0, 0x00000000, { 100.f, 0.f, 100.f, 5.f }}, // unused
{0, 0x00FFFFFF, {kRect.right(), kUV.right(), kRect.top(), kUV.top() }},
{0, 0x00000000, { 200.f, 10.f, 200.f, 10.f }}, // unused
{0, 0xFFFF00FF, {kRect.left(), kUV.left(), kRect.bottom(), kUV.bottom()}},
{0, 0xFFFFFF00, {kRect.right(), kUV.right(), kRect.bottom(), kUV.bottom()}},
};
static constexpr NoColorVertex kNoColorIndexedQuad[]{
{{kRect.left(), kUV.left(), kRect.top(), kUV.top() }},
{{ 100.f, 0.f, 100.f, 5.f }}, // unused
{{kRect.right(), kUV.right(), kRect.top(), kUV.top() }},
{{ 200.f, 10.f, 200.f, 10.f }}, // unused
{{kRect.left(), kUV.left(), kRect.bottom(), kUV.bottom()}},
{{kRect.right(), kUV.right(), kRect.bottom(), kUV.bottom()}},
};
static constexpr uint16_t kIndices[]{0, 2, 4, 2, 5, 4};
sk_sp<SkShader> fShader;
sk_sp<SkCustomMeshSpecification> fSpecWithColor;
sk_sp<SkCustomMeshSpecification> fSpecWithNoColor;
};
constexpr SkRect CustomMeshGM::kRect;
constexpr SkRect CustomMeshGM::kUV;
constexpr CustomMeshGM::ColorVertex CustomMeshGM::kColorQuad[];
constexpr CustomMeshGM::NoColorVertex CustomMeshGM::kNoColorQuad[];
constexpr CustomMeshGM::ColorVertex CustomMeshGM::kColorIndexedQuad[];
constexpr CustomMeshGM::NoColorVertex CustomMeshGM::kNoColorIndexedQuad[];
constexpr uint16_t CustomMeshGM::kIndices[];
DEF_GM( return new CustomMeshGM; )
class CustomMeshColorSpaceGM : public skiagm::GM {
public:
CustomMeshColorSpaceGM() {}
protected:
using Attribute = SkCustomMeshSpecification::Attribute;
using Varying = SkCustomMeshSpecification::Varying;
SkISize onISize() override { return {468, 258}; }
void onOnceBeforeDraw() override {
static const Attribute kAttributes[]{
{Attribute::Type::kFloat2, 0, SkString{"pos"} },
{Attribute::Type::kFloat4, 8, SkString{"color"}},
};
static const Varying kVaryings[]{
{Varying::Type::kHalf4, SkString{"color"}},
};
static constexpr char kPremulVS[] = R"(
float2 main(in Attributes attributes, out Varyings varyings) {
varyings.color = half4(attributes.color.a*attributes.color.rgb,
attributes.color.a);
return attributes.pos;
}
)";
static constexpr char kUnpremulVS[] = R"(
float2 main(in Attributes attributes, out Varyings varyings) {
varyings.color = attributes.color;
return attributes.pos;
}
)";
static constexpr char kFS[] = R"(
void main(in Varyings varyings, out half4 color) {
color = varyings.color;
}
)";
for (bool unpremul : {false, true}) {
auto at = unpremul ? kUnpremul_SkAlphaType : kPremul_SkAlphaType;
auto vs = unpremul ? kUnpremulVS : kPremulVS;
for (bool spin : {false, true}) {
auto cs = SkColorSpace::MakeSRGB();
if (spin) {
cs = cs->makeColorSpin();
}
auto [spec, error] = SkCustomMeshSpecification::Make(
SkMakeSpan(kAttributes, SK_ARRAY_COUNT(kAttributes)),
sizeof(Vertex),
SkMakeSpan(kVaryings, SK_ARRAY_COUNT(kVaryings)),
SkString(vs),
SkString(kFS),
std::move(cs),
at);
if (!spec) {
SkDebugf("%s\n", error.c_str());
}
fSpecs[SpecIndex(unpremul, spin)] = std::move(spec);
}
}
SkPoint pts[] = {{kRect.fLeft, 0}, {kRect.centerX(), 0}};
SkColor colors[] = {SK_ColorWHITE, SK_ColorTRANSPARENT};
fShader = SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kMirror);
}
SkString onShortName() override { return SkString("custommesh_cs"); }
DrawResult onDraw(SkCanvas* canvas, SkString* error) override {
// Force an intermediate surface if the canvas is in "legacy" mode
SkCanvas* c = canvas;
sk_sp<SkSurface> surface;
if (!c->imageInfo().colorSpace()) {
SkImageInfo info = canvas->imageInfo().makeColorSpace(SkColorSpace::MakeSRGB());
surface = canvas->makeSurface(info);
if (!surface) {
// This GM won't work on configs that use a recording canvas.
return DrawResult::kSkip;
}
c = surface->getCanvas();
c->clear(SK_ColorWHITE);
}
for (bool useShader : {false, true})
for (bool unpremul : {false, true}) {
c->save();
for (bool spin : {false, true}) {
SkCustomMesh cm;
cm.spec = fSpecs[SpecIndex(unpremul, spin)];
cm.bounds = kRect;
cm.vb = kQuad;
cm.vcount = 4;
cm.mode = SkCustomMesh::Mode::kTriangleStrip;
SkPaint paint;
paint.setShader(useShader ? fShader : nullptr);
SkBlendMode mode = useShader ? SkBlendMode::kModulate : SkBlendMode::kDst;
SkCanvasPriv::DrawCustomMesh(c,
std::move(cm),
SkBlender::Mode(mode),
paint);
c->translate(0, kRect.height() + 10);
}
c->restore();
c->translate(kRect.width() + 10, 0);
c->save();
}
if (surface) {
surface->draw(canvas, 0, 0);
}
return DrawResult::kOk;
}
private:
struct Vertex {
SkPoint pos;
SkColor4f color;
};
static int SpecIndex(bool spin, bool unpremul) {
return static_cast<int>(spin) + 2*static_cast<int>(unpremul);
}
static constexpr auto kRect = SkRect::MakeLTRB(20, 20, 120, 120);
static constexpr Vertex kQuad[] {
{{kRect.left() , kRect.top() }, {1, 0, 0, 1}},
{{kRect.right(), kRect.top() }, {0, 1, 0, 0}},
{{kRect.left() , kRect.bottom()}, {1, 1, 0, 0}},
{{kRect.right(), kRect.bottom()}, {0, 0, 1, 1}},
};
sk_sp<SkCustomMeshSpecification> fSpecs[4];
sk_sp<SkShader> fShader;
};
constexpr SkRect CustomMeshColorSpaceGM::kRect;
constexpr CustomMeshColorSpaceGM::Vertex CustomMeshColorSpaceGM::kQuad[];
DEF_GM( return new CustomMeshColorSpaceGM; )
} // namespace skiagm