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skia2/bench/GLVec4ScalarBench.cpp
Brian Osman f5beefd34d Fix shader linker errors on several GL benchmarks 
These were using an obsolete shader caps bit to manaully declare their
own FP output variable. That led to two outputs (after SkSL added
sk_FragColor), which led to errors about multiple outputs being declared
(without specifying location). SkSL handles all of this, so just use
sk_FragColor directly.

Bug: skia:
Change-Id: Id38657b6bf8c63c8f80d6ae3354a1507734a209f
Reviewed-on: https://skia-review.googlesource.com/73344
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
2017-11-17 20:52:26 +00:00

290 lines
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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkMatrix.h"
#include "SkPoint.h"
#include "SkString.h"
#if SK_SUPPORT_GPU
#include "GLBench.h"
#include "GrShaderCaps.h"
#include "GrShaderVar.h"
#include "gl/GrGLContext.h"
#include "gl/GrGLInterface.h"
#include "gl/GrGLUtil.h"
#include "../private/GrGLSL.h"
#include <stdio.h>
/**
* This is a GL benchmark for comparing the performance of using vec4 or float for coverage in GLSL.
* The generated shader code from this bench will draw several overlapping circles, one in each
* stage, to simulate coverage calculations. The number of circles (i.e. the number of stages) can
* be set as a parameter.
*/
class GLVec4ScalarBench : public GLBench {
public:
/*
* Use float or vec4 as GLSL data type for the output coverage
*/
enum CoverageSetup {
kUseScalar_CoverageSetup,
kUseVec4_CoverageSetup,
};
/*
* numStages determines the number of shader stages before the XP,
* which consequently determines how many circles are drawn
*/
GLVec4ScalarBench(CoverageSetup coverageSetup, uint32_t numStages)
: fCoverageSetup(coverageSetup)
, fNumStages(numStages)
, fVboId(0)
, fProgram(0) {
fName = NumStagesSetupToStr(coverageSetup, numStages);
}
protected:
const char* onGetName() override {
return fName.c_str();
}
void setup(const GrGLContext*) override;
void glDraw(int loops, const GrGLContext*) override;
void teardown(const GrGLInterface*) override;
private:
void setupSingleVbo(const GrGLInterface*, const SkMatrix*);
GrGLuint setupShader(const GrGLContext*);
static SkString NumStagesSetupToStr(CoverageSetup coverageSetup, uint32_t numStages) {
SkString name("GLVec4ScalarBench");
switch (coverageSetup) {
default:
case kUseScalar_CoverageSetup:
name.appendf("_scalar_%u_stage", numStages);
break;
case kUseVec4_CoverageSetup:
name.appendf("_vec4_%u_stage", numStages);
break;
}
return name;
}
static const GrGLuint kScreenWidth = 800;
static const GrGLuint kScreenHeight = 600;
static const uint32_t kNumTriPerDraw = 512;
static const uint32_t kVerticesPerTri = 3;
SkString fName;
CoverageSetup fCoverageSetup;
uint32_t fNumStages;
GrGLuint fVboId;
GrGLuint fProgram;
GrGLuint fFboTextureId;
};
///////////////////////////////////////////////////////////////////////////////////////////////////
GrGLuint GLVec4ScalarBench::setupShader(const GrGLContext* ctx) {
const GrShaderCaps* shaderCaps = ctx->caps()->shaderCaps();
const char* version = shaderCaps->versionDeclString();
// this shader draws fNumStages overlapping circles of increasing opacity (coverage) and
// decreasing size, with the center of each subsequent circle closer to the bottom-right
// corner of the screen than the previous circle.
// set up vertex shader; this is a trivial vertex shader that passes through position and color
GrShaderVar aPosition("a_position", kHalf2_GrSLType, GrShaderVar::kIn_TypeModifier);
GrShaderVar oPosition("o_position", kHalf2_GrSLType, GrShaderVar::kOut_TypeModifier);
GrShaderVar aColor("a_color", kHalf3_GrSLType, GrShaderVar::kIn_TypeModifier);
GrShaderVar oColor("o_color", kHalf3_GrSLType, GrShaderVar::kOut_TypeModifier);
SkString vshaderTxt(version);
aPosition.appendDecl(shaderCaps, &vshaderTxt);
vshaderTxt.append(";\n");
aColor.appendDecl(shaderCaps, &vshaderTxt);
vshaderTxt.append(";\n");
oPosition.appendDecl(shaderCaps, &vshaderTxt);
vshaderTxt.append(";\n");
oColor.appendDecl(shaderCaps, &vshaderTxt);
vshaderTxt.append(";\n");
vshaderTxt.append(
"void main()\n"
"{\n"
" sk_Position = float4(a_position, 0.0, 1.0);\n"
" o_position = a_position;\n"
" o_color = a_color;\n"
"}\n");
// set up fragment shader; this fragment shader will have fNumStages coverage stages plus an
// XP stage at the end. Each coverage stage computes the pixel's distance from some hard-
// coded center and compare that to some hard-coded circle radius to compute a coverage.
// Then, this coverage is mixed with the coverage from the previous stage and passed to the
// next stage.
SkString fshaderTxt(version);
oPosition.setTypeModifier(GrShaderVar::kIn_TypeModifier);
oPosition.appendDecl(shaderCaps, &fshaderTxt);
fshaderTxt.append(";\n");
oColor.setTypeModifier(GrShaderVar::kIn_TypeModifier);
oColor.appendDecl(shaderCaps, &fshaderTxt);
fshaderTxt.append(";\n");
fshaderTxt.appendf(
"void main()\n"
"{\n"
" half4 outputColor;\n"
" %s outputCoverage;\n"
" outputColor = half4(%s, 1.0);\n"
" outputCoverage = %s;\n",
fCoverageSetup == kUseVec4_CoverageSetup ? "half4" : "half",
oColor.getName().c_str(),
fCoverageSetup == kUseVec4_CoverageSetup ? "half4(1.0)" : "1.0"
);
float radius = 1.0f;
for (uint32_t i = 0; i < fNumStages; i++) {
float centerX = 1.0f - radius;
float centerY = 1.0f - radius;
fshaderTxt.appendf(
" {\n"
" half d = length(%s - half2(%f, %f));\n"
" half edgeAlpha = clamp(100.0 * (%f - d), 0.0, 1.0);\n"
" outputCoverage = 0.5 * outputCoverage + 0.5 * %s;\n"
" }\n",
oPosition.getName().c_str(), centerX, centerY,
radius,
fCoverageSetup == kUseVec4_CoverageSetup ? "half4(edgeAlpha)" : "edgeAlpha"
);
radius *= 0.8f;
}
fshaderTxt.append(
" {\n"
" sk_FragColor = outputColor * outputCoverage;\n"
" }\n"
"}\n");
return CreateProgram(ctx, vshaderTxt.c_str(), fshaderTxt.c_str());
}
template<typename Func>
static void setup_matrices(int numQuads, Func f) {
// We draw a really small triangle so we are not fill rate limited
for (int i = 0 ; i < numQuads; i++) {
SkMatrix m = SkMatrix::I();
m.setScale(0.01f, 0.01f);
f(m);
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
struct Vertex {
SkPoint fPositions;
GrGLfloat fColors[3];
};
void GLVec4ScalarBench::setupSingleVbo(const GrGLInterface* gl, const SkMatrix* viewMatrices) {
// triangles drawn will alternate between the top-right half of the screen and the bottom-left
// half of the screen
Vertex vertices[kVerticesPerTri * kNumTriPerDraw];
for (uint32_t i = 0; i < kNumTriPerDraw; i++) {
Vertex* v = &vertices[i * kVerticesPerTri];
if (i % 2 == 0) {
v[0].fPositions.set(-1.0f, -1.0f);
v[1].fPositions.set( 1.0f, -1.0f);
v[2].fPositions.set( 1.0f, 1.0f);
} else {
v[0].fPositions.set(-1.0f, -1.0f);
v[1].fPositions.set( 1.0f, 1.0f);
v[2].fPositions.set( -1.0f, 1.0f);
}
SkPoint* position = reinterpret_cast<SkPoint*>(v);
viewMatrices[i].mapPointsWithStride(position, sizeof(Vertex), kVerticesPerTri);
GrGLfloat color[3] = {1.0f, 0.0f, 1.0f};
for (uint32_t j = 0; j < kVerticesPerTri; j++) {
v->fColors[0] = color[0];
v->fColors[1] = color[1];
v->fColors[2] = color[2];
v++;
}
}
GR_GL_CALL(gl, GenBuffers(1, &fVboId));
GR_GL_CALL(gl, BindBuffer(GR_GL_ARRAY_BUFFER, fVboId));
GR_GL_CALL(gl, EnableVertexAttribArray(0));
GR_GL_CALL(gl, EnableVertexAttribArray(1));
GR_GL_CALL(gl, VertexAttribPointer(0, 2, GR_GL_FLOAT, GR_GL_FALSE, sizeof(Vertex),
(GrGLvoid*)0));
GR_GL_CALL(gl, VertexAttribPointer(1, 3, GR_GL_FLOAT, GR_GL_FALSE, sizeof(Vertex),
(GrGLvoid*)(sizeof(SkPoint))));
GR_GL_CALL(gl, BufferData(GR_GL_ARRAY_BUFFER, sizeof(vertices), vertices, GR_GL_STATIC_DRAW));
}
void GLVec4ScalarBench::setup(const GrGLContext* ctx) {
const GrGLInterface* gl = ctx->interface();
if (!gl) {
SK_ABORT("GL interface is nullptr in setup()!\n");
}
fFboTextureId = SetupFramebuffer(gl, kScreenWidth, kScreenHeight);
fProgram = this->setupShader(ctx);
int index = 0;
SkMatrix viewMatrices[kNumTriPerDraw];
setup_matrices(kNumTriPerDraw, [&index, &viewMatrices](const SkMatrix& m) {
viewMatrices[index++] = m;
});
this->setupSingleVbo(gl, viewMatrices);
GR_GL_CALL(gl, UseProgram(fProgram));
}
void GLVec4ScalarBench::glDraw(int loops, const GrGLContext* ctx) {
const GrGLInterface* gl = ctx->interface();
for (int i = 0; i < loops; i++) {
GR_GL_CALL(gl, DrawArrays(GR_GL_TRIANGLES, 0, kVerticesPerTri * kNumTriPerDraw));
}
// using -w when running nanobench will not produce correct images;
// changing this to #if 1 will write the correct images to the Skia folder.
#if 0
SkString filename("out");
filename.appendf("_%s.png", this->getName());
DumpImage(gl, kScreenWidth, kScreenHeight, filename.c_str());
#endif
}
void GLVec4ScalarBench::teardown(const GrGLInterface* gl) {
GR_GL_CALL(gl, BindBuffer(GR_GL_ARRAY_BUFFER, 0));
GR_GL_CALL(gl, BindTexture(GR_GL_TEXTURE_2D, 0));
GR_GL_CALL(gl, BindFramebuffer(GR_GL_FRAMEBUFFER, 0));
GR_GL_CALL(gl, DeleteTextures(1, &fFboTextureId));
GR_GL_CALL(gl, DeleteProgram(fProgram));
GR_GL_CALL(gl, DeleteBuffers(1, &fVboId));
}
///////////////////////////////////////////////////////////////////////////////
DEF_BENCH( return new GLVec4ScalarBench(GLVec4ScalarBench::kUseScalar_CoverageSetup, 1) )
DEF_BENCH( return new GLVec4ScalarBench(GLVec4ScalarBench::kUseVec4_CoverageSetup, 1) )
DEF_BENCH( return new GLVec4ScalarBench(GLVec4ScalarBench::kUseScalar_CoverageSetup, 2) )
DEF_BENCH( return new GLVec4ScalarBench(GLVec4ScalarBench::kUseVec4_CoverageSetup, 2) )
DEF_BENCH( return new GLVec4ScalarBench(GLVec4ScalarBench::kUseScalar_CoverageSetup, 4) )
DEF_BENCH( return new GLVec4ScalarBench(GLVec4ScalarBench::kUseVec4_CoverageSetup, 4) )
DEF_BENCH( return new GLVec4ScalarBench(GLVec4ScalarBench::kUseScalar_CoverageSetup, 6) )
DEF_BENCH( return new GLVec4ScalarBench(GLVec4ScalarBench::kUseVec4_CoverageSetup, 6) )
DEF_BENCH( return new GLVec4ScalarBench(GLVec4ScalarBench::kUseScalar_CoverageSetup, 8) )
DEF_BENCH( return new GLVec4ScalarBench(GLVec4ScalarBench::kUseVec4_CoverageSetup, 8) )
#endif
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