TextureSampling.cpp

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Author : Brandon Schade
Date : 2020-03-19 14:35:48
Hash : 8f6d1af9
Message : Vulkan: Implement EXT_texture_format_sRGB_override Implemented support for EXT_texture_format_sRGB_override This is done by creating new imageviews for textures with sRGB overridden that reinterpret the format to its sRGB counterpart. As preparation for this, textures that use this feature are reallocated with VK_IMAGE_CREATE_MUTABLE_FORMAT_BIT. This will have a performance cost for textures that use this feature, but should have no performance cost for regular textures, since they will not have this bit set. Bug: angleproject:4561 Test: angle_end2end_tests --gtest_filter=SRGBTextureTest.*Vulkan* Change-Id: Iba25f1f2b0a7227959c1cb4ba6e3ca8311c20d06 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2152145 Commit-Queue: Mohan Maiya <m.maiya@samsung.com> Reviewed-by: Tim Van Patten <timvp@google.com>
src/tests/perf_tests/TextureSampling.cpp
//
// Copyright 2015 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// TextureSamplingBenchmark:
//   Performance test for texture sampling. The test generates a texture containing random data
//   and then blurs it in a fragment shader using nearest neighbor sampling. The test is
//   specifically designed to test overhead of GLSL's builtin texture*() functions that may result
//   from how ANGLE translates them on each backend.
//

#include "ANGLEPerfTest.h"

#include <iostream>
#include <random>
#include <sstream>

#include "util/shader_utils.h"

using namespace angle;

namespace
{
constexpr unsigned int kIterationsPerStep = 4;

struct TextureSamplingParams final : public RenderTestParams
{
    TextureSamplingParams()
    {
        iterationsPerStep = kIterationsPerStep;

        // Common default params
        majorVersion = 2;
        minorVersion = 0;
        windowWidth  = 720;
        windowHeight = 720;

        numSamplers = 2;
        textureSize = 32;
        kernelSize  = 3;
    }

    std::string story() const override;
    unsigned int numSamplers;
    unsigned int textureSize;
    unsigned int kernelSize;
};

std::ostream &operator<<(std::ostream &os, const TextureSamplingParams &params)
{
    os << params.backendAndStory().substr(1);
    return os;
}

std::string TextureSamplingParams::story() const
{
    std::stringstream strstr;

    strstr << RenderTestParams::story() << "_" << numSamplers << "samplers";

    return strstr.str();
}

class TextureSamplingBenchmark : public ANGLERenderTest,
                                 public ::testing::WithParamInterface<TextureSamplingParams>
{
  public:
    TextureSamplingBenchmark();

    void initializeBenchmark() override;
    void destroyBenchmark() override;
    void drawBenchmark() override;

  protected:
    void initShaders();
    void initVertexBuffer();
    void initTextures();

    GLuint mProgram;
    GLuint mBuffer;
    std::vector<GLuint> mTextures;
};

TextureSamplingBenchmark::TextureSamplingBenchmark()
    : ANGLERenderTest("TextureSampling", GetParam()), mProgram(0u), mBuffer(0u)
{}

void TextureSamplingBenchmark::initializeBenchmark()
{
    const auto &params = GetParam();

    // Verify "numSamplers" is within MAX_TEXTURE_IMAGE_UNITS limit
    GLint maxTextureImageUnits;
    glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &maxTextureImageUnits);

    if (params.numSamplers > static_cast<unsigned int>(maxTextureImageUnits))
    {
        FAIL() << "Sampler count (" << params.numSamplers << ")"
               << " exceeds maximum texture count: " << maxTextureImageUnits << std::endl;
    }
    initShaders();
    initVertexBuffer();
    initTextures();
    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
    glViewport(0, 0, getWindow()->getWidth(), getWindow()->getHeight());

    ASSERT_GL_NO_ERROR();
}

void TextureSamplingBenchmark::initShaders()
{
    const auto &params = GetParam();

    std::stringstream vstrstr;
    vstrstr << "attribute vec2 aPosition;\n"
               "varying vec2 vTextureCoordinates;\n"
               "void main()\n"
               "{\n"
               "    vTextureCoordinates = (aPosition + vec2(1.0)) * 0.5;\n"
               "    gl_Position = vec4(aPosition, 0, 1.0);\n"
               "}";

    std::stringstream fstrstr;
    fstrstr << "precision mediump float;\n"
               "varying vec2 vTextureCoordinates;\n";
    for (unsigned int count = 0; count < params.numSamplers; count++)
    {
        fstrstr << "uniform sampler2D uSampler" << count << ";\n";
    }
    fstrstr << "void main()\n"
               "{\n"
               "    const float inverseTextureSize = 1.0 / "
            << params.textureSize
            << ".0;\n"
               "    vec4 colorOut = vec4(0.0, 0.0, 0.0, 1.0);\n";
    for (unsigned int count = 0; count < params.numSamplers; count++)
    {
        fstrstr << "    for (int x = 0; x < " << params.kernelSize
                << "; ++x)\n"
                   "    {\n"
                   "        for (int y = 0; y < "
                << params.kernelSize
                << "; ++y)\n"
                   "        {\n"
                   "            colorOut += texture2D(uSampler"
                << count
                << ", vTextureCoordinates + vec2(x, y) * inverseTextureSize) * 0.1;\n"
                   "        }\n"
                   "    }\n";
    }
    fstrstr << "    gl_FragColor = colorOut;\n"
               "}\n";

    mProgram = CompileProgram(vstrstr.str().c_str(), fstrstr.str().c_str());
    ASSERT_NE(0u, mProgram);

    // Use the program object
    glUseProgram(mProgram);
}

void TextureSamplingBenchmark::initVertexBuffer()
{
    std::vector<float> vertexPositions(12);
    {
        // Bottom left triangle
        vertexPositions[0] = -1.0f;
        vertexPositions[1] = -1.0f;
        vertexPositions[2] = 1.0f;
        vertexPositions[3] = -1.0f;
        vertexPositions[4] = -1.0f;
        vertexPositions[5] = 1.0f;

        // Top right triangle
        vertexPositions[6]  = -1.0f;
        vertexPositions[7]  = 1.0f;
        vertexPositions[8]  = 1.0f;
        vertexPositions[9]  = -1.0f;
        vertexPositions[10] = 1.0f;
        vertexPositions[11] = 1.0f;
    }

    glGenBuffers(1, &mBuffer);
    glBindBuffer(GL_ARRAY_BUFFER, mBuffer);
    glBufferData(GL_ARRAY_BUFFER, vertexPositions.size() * sizeof(float), &vertexPositions[0],
                 GL_STATIC_DRAW);

    GLint positionLocation = glGetAttribLocation(mProgram, "aPosition");
    ASSERT_NE(-1, positionLocation);

    glVertexAttribPointer(positionLocation, 2, GL_FLOAT, GL_FALSE, 0, nullptr);
    glEnableVertexAttribArray(positionLocation);
}

void TextureSamplingBenchmark::initTextures()
{
    const auto &params = GetParam();

    unsigned int dataSize = params.textureSize * params.textureSize;
    std::vector<unsigned int> randomTextureData;
    randomTextureData.resize(dataSize);

    unsigned int pseudoRandom = 1u;
    for (unsigned int i = 0; i < dataSize; ++i)
    {
        pseudoRandom         = pseudoRandom * 1664525u + 1013904223u;
        randomTextureData[i] = pseudoRandom;
    }

    mTextures.resize(params.numSamplers);
    glGenTextures(params.numSamplers, mTextures.data());
    for (unsigned int i = 0; i < params.numSamplers; ++i)
    {
        glActiveTexture(GL_TEXTURE0 + i);
        glBindTexture(GL_TEXTURE_2D, mTextures[i]);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, params.textureSize, params.textureSize, 0, GL_RGBA,
                     GL_UNSIGNED_BYTE, randomTextureData.data());
    }

    for (unsigned int count = 0; count < params.numSamplers; count++)
    {
        std::stringstream samplerstrstr;
        samplerstrstr << "uSampler" << count;
        GLint samplerLocation = glGetUniformLocation(mProgram, samplerstrstr.str().c_str());
        ASSERT_NE(-1, samplerLocation);

        glUniform1i(samplerLocation, count);
    }
}

void TextureSamplingBenchmark::destroyBenchmark()
{
    const auto &params = GetParam();

    glDeleteProgram(mProgram);
    glDeleteBuffers(1, &mBuffer);
    if (!mTextures.empty())
    {
        glDeleteTextures(params.numSamplers, mTextures.data());
    }
}

void TextureSamplingBenchmark::drawBenchmark()
{
    glClear(GL_COLOR_BUFFER_BIT);

    const auto &params = GetParam();

    for (unsigned int it = 0; it < params.iterationsPerStep; ++it)
    {
        glDrawArrays(GL_TRIANGLES, 0, 6);
    }

    ASSERT_GL_NO_ERROR();
}

// Identical to TextureSamplingBenchmark, but enables and then disables
// EXT_texture_format_sRGB_override during initialization. This should force the internal texture
// representation to use VK_IMAGE_CREATE_MUTABLE_FORMAT_BIT, which is expected to carry a
// performance penalty. This penalty can be quantified by comparing the results of this test with
// the results from TextureSamplingBenchmark
class TextureSamplingMutableFormatBenchmark : public TextureSamplingBenchmark
{
  public:
    void initializeBenchmark() override;

  protected:
    void initTextures();
};

void TextureSamplingMutableFormatBenchmark::initializeBenchmark()
{
    if (!IsGLExtensionEnabled("GL_EXT_texture_sRGB_override"))
    {
        FAIL() << "GL_EXT_texture_sRGB_override not supported!" << std::endl;
    }
    TextureSamplingBenchmark::initializeBenchmark();
    initTextures();
}

void TextureSamplingMutableFormatBenchmark::initTextures()
{
    TextureSamplingBenchmark::initTextures();

    for (unsigned int i = 0; i < mTextures.size(); ++i)
    {
        glActiveTexture(GL_TEXTURE0 + i);
        glBindTexture(GL_TEXTURE_2D, mTextures[i]);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_FORMAT_SRGB_OVERRIDE_EXT, GL_SRGB);
    }

    // Force a state update
    drawBenchmark();

    for (unsigned int i = 0; i < mTextures.size(); ++i)
    {
        glActiveTexture(GL_TEXTURE0 + i);
        glBindTexture(GL_TEXTURE_2D, mTextures[i]);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_FORMAT_SRGB_OVERRIDE_EXT, GL_NONE);
    }
}

TextureSamplingParams D3D11Params()
{
    TextureSamplingParams params;
    params.eglParameters = egl_platform::D3D11();
    return params;
}

TextureSamplingParams D3D9Params()
{
    TextureSamplingParams params;
    params.eglParameters = egl_platform::D3D9();
    return params;
}

TextureSamplingParams OpenGLOrGLESParams()
{
    TextureSamplingParams params;
    params.eglParameters = egl_platform::OPENGL_OR_GLES();
    return params;
}

TextureSamplingParams VulkanParams()
{
    TextureSamplingParams params;
    params.eglParameters = egl_platform::VULKAN();
    return params;
}

}  // anonymous namespace

TEST_P(TextureSamplingBenchmark, Run)
{
    run();
}

TEST_P(TextureSamplingMutableFormatBenchmark, Run)
{
    run();
}

ANGLE_INSTANTIATE_TEST(TextureSamplingBenchmark,
                       D3D11Params(),
                       D3D9Params(),
                       OpenGLOrGLESParams(),
                       VulkanParams());

ANGLE_INSTANTIATE_TEST(TextureSamplingMutableFormatBenchmark, VulkanParams());
kc3-lang/angle/src/tests/perf_tests/TextureSampling.cpp

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kc3-lang/angle /src/tests/perf_tests/TextureSampling.cpp
