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skia2/gm/vertices.cpp
Brian Osman ffd11f4ab3 Adding attribute types to SkVertices 
Adds structure to the per-vertex (now custom) data.
Attributes currently just have a type, but the next
step is to augment that with semantic flags to handle
transformation logic in the vertex shader.

Added unit tests and GMs that exercise attributes of
varying float counts, as well as normalized bytes.

Bug: skia:9984
Change-Id: I02402d40b66a6e15b39f71125004efb98bc06295
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/280338
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2020-04-01 23:23:26 +00:00

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/*
* Copyright 2013 Google Inc.
*
* 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/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkMatrix.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkShader.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypes.h"
#include "include/core/SkVertices.h"
#include "include/effects/SkGradientShader.h"
#include "include/effects/SkRuntimeEffect.h"
#include "include/private/SkTDArray.h"
#include "include/utils/SkRandom.h"
#include "src/core/SkVerticesPriv.h"
#include "src/shaders/SkLocalMatrixShader.h"
#include "src/utils/SkPatchUtils.h"
#include "tools/Resources.h"
#include "tools/ToolUtils.h"
#include <initializer_list>
#include <utility>
static constexpr SkScalar kShaderSize = 40;
static sk_sp<SkShader> make_shader1(SkScalar shaderScale) {
const SkColor colors[] = {
SK_ColorRED, SK_ColorCYAN, SK_ColorGREEN, SK_ColorWHITE,
SK_ColorMAGENTA, SK_ColorBLUE, SK_ColorYELLOW,
};
const SkPoint pts[] = {{kShaderSize / 4, 0}, {3 * kShaderSize / 4, kShaderSize}};
const SkMatrix localMatrix = SkMatrix::MakeScale(shaderScale, shaderScale);
sk_sp<SkShader> grad = SkGradientShader::MakeLinear(pts, colors, nullptr,
SK_ARRAY_COUNT(colors),
SkTileMode::kMirror, 0,
&localMatrix);
// Throw in a couple of local matrix wrappers for good measure.
return shaderScale == 1
? grad
: sk_make_sp<SkLocalMatrixShader>(
sk_make_sp<SkLocalMatrixShader>(std::move(grad), SkMatrix::MakeTrans(-10, 0)),
SkMatrix::MakeTrans(10, 0));
}
static sk_sp<SkShader> make_shader2() {
return SkShaders::Color(SK_ColorBLUE);
}
static sk_sp<SkColorFilter> make_color_filter() {
return SkColorFilters::Blend(0xFFAABBCC, SkBlendMode::kDarken);
}
static constexpr SkScalar kMeshSize = 30;
// start with the center of a 3x3 grid of vertices.
static constexpr uint16_t kMeshFan[] = {
4,
0, 1, 2, 5, 8, 7, 6, 3, 0
};
static const int kMeshIndexCnt = (int)SK_ARRAY_COUNT(kMeshFan);
static const int kMeshVertexCnt = 9;
static void fill_mesh(SkPoint pts[kMeshVertexCnt], SkPoint texs[kMeshVertexCnt],
SkColor colors[kMeshVertexCnt], SkScalar shaderScale) {
pts[0].set(0, 0);
pts[1].set(kMeshSize / 2, 3);
pts[2].set(kMeshSize, 0);
pts[3].set(3, kMeshSize / 2);
pts[4].set(kMeshSize / 2, kMeshSize / 2);
pts[5].set(kMeshSize - 3, kMeshSize / 2);
pts[6].set(0, kMeshSize);
pts[7].set(kMeshSize / 2, kMeshSize - 3);
pts[8].set(kMeshSize, kMeshSize);
const auto shaderSize = kShaderSize * shaderScale;
texs[0].set(0, 0);
texs[1].set(shaderSize / 2, 0);
texs[2].set(shaderSize, 0);
texs[3].set(0, shaderSize / 2);
texs[4].set(shaderSize / 2, shaderSize / 2);
texs[5].set(shaderSize, shaderSize / 2);
texs[6].set(0, shaderSize);
texs[7].set(shaderSize / 2, shaderSize);
texs[8].set(shaderSize, shaderSize);
SkRandom rand;
for (size_t i = 0; i < kMeshVertexCnt; ++i) {
colors[i] = rand.nextU() | 0xFF000000;
}
}
class VerticesGM : public skiagm::GM {
SkPoint fPts[kMeshVertexCnt];
SkPoint fTexs[kMeshVertexCnt];
SkColor fColors[kMeshVertexCnt];
sk_sp<SkShader> fShader1;
sk_sp<SkShader> fShader2;
sk_sp<SkColorFilter> fColorFilter;
SkScalar fShaderScale;
public:
VerticesGM(SkScalar shaderScale) : fShaderScale(shaderScale) {}
protected:
void onOnceBeforeDraw() override {
fill_mesh(fPts, fTexs, fColors, fShaderScale);
fShader1 = make_shader1(fShaderScale);
fShader2 = make_shader2();
fColorFilter = make_color_filter();
}
SkString onShortName() override {
SkString name("vertices");
if (fShaderScale != 1) {
name.append("_scaled_shader");
}
return name;
}
SkISize onISize() override {
return SkISize::Make(975, 1175);
}
void onDraw(SkCanvas* canvas) override {
const SkBlendMode modes[] = {
SkBlendMode::kClear,
SkBlendMode::kSrc,
SkBlendMode::kDst,
SkBlendMode::kSrcOver,
SkBlendMode::kDstOver,
SkBlendMode::kSrcIn,
SkBlendMode::kDstIn,
SkBlendMode::kSrcOut,
SkBlendMode::kDstOut,
SkBlendMode::kSrcATop,
SkBlendMode::kDstATop,
SkBlendMode::kXor,
SkBlendMode::kPlus,
SkBlendMode::kModulate,
SkBlendMode::kScreen,
SkBlendMode::kOverlay,
SkBlendMode::kDarken,
SkBlendMode::kLighten,
SkBlendMode::kColorDodge,
SkBlendMode::kColorBurn,
SkBlendMode::kHardLight,
SkBlendMode::kSoftLight,
SkBlendMode::kDifference,
SkBlendMode::kExclusion,
SkBlendMode::kMultiply,
SkBlendMode::kHue,
SkBlendMode::kSaturation,
SkBlendMode::kColor,
SkBlendMode::kLuminosity,
};
SkPaint paint;
canvas->translate(4, 4);
int x = 0;
for (auto mode : modes) {
canvas->save();
for (float alpha : {1.0f, 0.5f}) {
for (const auto& cf : {sk_sp<SkColorFilter>(nullptr), fColorFilter}) {
for (const auto& shader : {fShader1, fShader2}) {
static constexpr struct {
bool fHasColors;
bool fHasTexs;
} kAttrs[] = {{true, false}, {false, true}, {true, true}};
for (auto attrs : kAttrs) {
paint.setShader(shader);
paint.setColorFilter(cf);
paint.setAlphaf(alpha);
const SkColor* colors = attrs.fHasColors ? fColors : nullptr;
const SkPoint* texs = attrs.fHasTexs ? fTexs : nullptr;
auto v = SkVertices::MakeCopy(SkVertices::kTriangleFan_VertexMode,
kMeshVertexCnt, fPts, texs, colors,
kMeshIndexCnt, kMeshFan);
canvas->drawVertices(v, mode, paint);
canvas->translate(40, 0);
++x;
}
}
}
}
canvas->restore();
canvas->translate(0, 40);
}
}
private:
typedef skiagm::GM INHERITED;
};
/////////////////////////////////////////////////////////////////////////////////////
DEF_GM(return new VerticesGM(1);)
DEF_GM(return new VerticesGM(1 / kShaderSize);)
static void draw_batching(SkCanvas* canvas) {
// Triangle fans can't batch so we convert to regular triangles,
static constexpr int kNumTris = kMeshIndexCnt - 2;
SkVertices::Builder builder(SkVertices::kTriangles_VertexMode, kMeshVertexCnt, 3 * kNumTris,
SkVertices::kHasColors_BuilderFlag |
SkVertices::kHasTexCoords_BuilderFlag);
SkPoint* pts = builder.positions();
SkPoint* texs = builder.texCoords();
SkColor* colors = builder.colors();
fill_mesh(pts, texs, colors, 1);
SkTDArray<SkMatrix> matrices;
matrices.push()->reset();
matrices.push()->setTranslate(0, 40);
SkMatrix* m = matrices.push();
m->setRotate(45, kMeshSize / 2, kMeshSize / 2);
m->postScale(1.2f, .8f, kMeshSize / 2, kMeshSize / 2);
m->postTranslate(0, 80);
auto shader = make_shader1(1);
uint16_t* indices = builder.indices();
for (size_t i = 0; i < kNumTris; ++i) {
indices[3 * i] = kMeshFan[0];
indices[3 * i + 1] = kMeshFan[i + 1];
indices[3 * i + 2] = kMeshFan[i + 2];
}
canvas->save();
canvas->translate(10, 10);
for (bool useShader : {false, true}) {
for (bool useTex : {false, true}) {
for (const auto& m : matrices) {
canvas->save();
canvas->concat(m);
SkPaint paint;
paint.setShader(useShader ? shader : nullptr);
const SkPoint* t = useTex ? texs : nullptr;
auto v = SkVertices::MakeCopy(SkVertices::kTriangles_VertexMode, kMeshVertexCnt,
pts, t, colors, kNumTris * 3, indices);
canvas->drawVertices(v, SkBlendMode::kModulate, paint);
canvas->restore();
}
canvas->translate(0, 120);
}
}
canvas->restore();
}
// This test exists to exercise batching in the gpu backend.
DEF_SIMPLE_GM(vertices_batching, canvas, 100, 500) {
draw_batching(canvas);
canvas->translate(50, 0);
draw_batching(canvas);
}
using AttrType = SkVertices::Attribute::Type;
DEF_SIMPLE_GM(vertices_data, canvas, 512, 256) {
for (auto attrType : {AttrType::kFloat4, AttrType::kByte4_unorm}) {
SkRect r = SkRect::MakeWH(256, 256);
int vcount = 4; // just a quad
int icount = 0;
SkVertices::Attribute attrs[] = { attrType };
SkVertices::Builder builder(SkVertices::kTriangleFan_VertexMode, vcount, icount, attrs, 1);
r.toQuad(builder.positions());
if (attrType == AttrType::kFloat4) {
SkV4* col = (SkV4*)builder.customData();
col[0] = {1, 0, 0, 1}; // red
col[1] = {0, 1, 0, 1}; // green
col[2] = {0, 0, 1, 1}; // blue
col[3] = {0.5, 0.5, 0.5, 1}; // gray
} else {
uint32_t* col = (uint32_t*)builder.customData();
col[0] = 0xFF0000FF;
col[1] = 0xFF00FF00;
col[2] = 0xFFFF0000;
col[3] = 0xFF7F7F7F;
}
SkPaint paint;
const char* gProg = R"(
varying float4 vtx_color;
void main(float2 p, inout half4 color) {
color = half4(vtx_color);
}
)";
auto[effect, errorText] = SkRuntimeEffect::Make(SkString(gProg));
paint.setShader(effect->makeShader(nullptr, nullptr, 0, nullptr, true));
canvas->drawVertices(builder.detach(), paint);
canvas->translate(r.width(), 0);
}
}
// Test case for skbug.com/10069. We need to draw the vertices twice (with different matrices) to
// trigger the bug.
DEF_SIMPLE_GM(vertices_perspective, canvas, 256, 256) {
SkPaint paint;
paint.setShader(ToolUtils::create_checkerboard_shader(SK_ColorBLACK, SK_ColorWHITE, 32));
SkRect r = SkRect::MakeWH(128, 128);
SkPoint pos[4];
r.toQuad(pos);
auto verts = SkVertices::MakeCopy(SkVertices::kTriangleFan_VertexMode, 4, pos, pos, nullptr);
SkMatrix persp;
persp.setPerspY(SK_Scalar1 / 100);
canvas->save();
canvas->concat(persp);
canvas->drawRect(r, paint);
canvas->restore();
canvas->save();
canvas->translate(r.width(), 0);
canvas->concat(persp);
canvas->drawRect(r, paint);
canvas->restore();
canvas->save();
canvas->translate(0, r.height());
canvas->concat(persp);
canvas->drawVertices(verts, paint);
canvas->restore();
canvas->save();
canvas->translate(r.width(), r.height());
canvas->concat(persp);
canvas->drawVertices(verts, paint);
canvas->restore();
}
DEF_SIMPLE_GM(vertices_data_lerp, canvas, 256, 256) {
SkPoint pts[12] = {{0, 0}, {85, 0}, {171, 0}, {256, 0}, {256, 85}, {256, 171},
{256, 256}, {171, 256}, {85, 256}, {0, 256}, {0, 171}, {0, 85}};
auto patchVerts = SkPatchUtils::MakeVertices(pts, nullptr, nullptr, 12, 12);
SkVerticesPriv pv(patchVerts->priv());
SkVertices::Attribute attrs[1] = { AttrType::kFloat };
SkVertices::Builder builder(pv.mode(), pv.vertexCount(), pv.indexCount(), attrs, 1);
memcpy(builder.positions(), pv.positions(), pv.vertexCount() * sizeof(SkPoint));
memcpy(builder.indices(), pv.indices(), pv.indexCount() * sizeof(uint16_t));
SkRandom rnd;
float* lerpData = (float*)builder.customData();
for (int i = 0; i < pv.vertexCount(); ++i) {
lerpData[i] = rnd.nextBool() ? 1.0f : 0.0f;
}
auto verts = builder.detach();
SkPaint paint;
const char* gProg = R"(
in fragmentProcessor c0;
in fragmentProcessor c1;
varying float vtx_lerp;
void main(float2 p, inout half4 color) {
half4 col0 = sample(c0, p);
half4 col1 = sample(c1, p);
color = mix(col0, col1, half(vtx_lerp));
}
)";
auto [effect, errorText] = SkRuntimeEffect::Make(SkString(gProg));
SkMatrix scale = SkMatrix::MakeScale(2);
sk_sp<SkShader> children[] = {
GetResourceAsImage("images/mandrill_256.png")->makeShader(),
GetResourceAsImage("images/color_wheel.png")->makeShader(scale),
};
paint.setShader(effect->makeShader(nullptr, children, 2, nullptr, false));
canvas->drawVertices(verts, paint);
}
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