gpu/command_buffer/tests/gl_chromium_framebuffer_mixed_samples_unittest.cc - chromium/src - Git at Google

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 #include <stdint.h>
 #include <string.h>

 #include <memory>

 #include "base/command_line.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
 #include "gpu/command_buffer/tests/gl_manager.h"
 #include "gpu/command_buffer/tests/gl_test_utils.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"

 #define SHADER(Src) #Src

 namespace gpu {

 class CHROMIUMFramebufferMixedSamplesTest : public testing::Test {
  protected:
   const GLuint kWidth = 100;
   const GLuint kHeight = 100;

   void SetUp() override {
     gl_.Initialize(GLManager::Options());
   }

   void TearDown() override { gl_.Destroy(); }

   bool IsApplicable() const {
     return GLTestHelper::HasExtension(
                "GL_CHROMIUM_framebuffer_mixed_samples") &&
            GLTestHelper::HasExtension("GL_OES_rgb8_rgba8");
   }

   enum SetupFBOType {
     MixedSampleFBO,   // 1 color sample, N stencil samples.
     SingleSampleFBO,  // 1 color sample, 1 stencil sample.
   };

   void SetupState(SetupFBOType fbo_type) {
     // clang-format off
     static const char* kVertexShaderSource = SHADER(
         attribute mediump vec4 position;
         void main() {
           gl_Position = position;
         });
     static const char* kFragmentShaderSource = SHADER(
         uniform mediump vec4 color;
         void main() {
           gl_FragColor = color;
         });
     // clang-format on
     GLuint program =
         GLTestHelper::LoadProgram(kVertexShaderSource, kFragmentShaderSource);
     glUseProgram(program);
     GLuint position_loc = glGetAttribLocation(program, "position");
     color_loc_ = glGetUniformLocation(program, "color");

     GLuint vbo = 0;
     glGenBuffers(1, &vbo);
     glBindBuffer(GL_ARRAY_BUFFER, vbo);
     static float vertices[] = {
         1.0f,  1.0f, -1.0f, 1.0f,  -1.0f, -1.0f, -1.0f, 1.0f, -1.0f,
         -1.0f, 1.0f, -1.0f, -1.0f, -1.0f, 1.0f,  -1.0f, 1.0f, 1.0f,
     };
     glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
     glEnableVertexAttribArray(position_loc);
     glVertexAttribPointer(position_loc, 2, GL_FLOAT, GL_FALSE, 0, 0);
     glBindBuffer(GL_ARRAY_BUFFER, 0);

     GLuint texture = 0;
     glActiveTexture(GL_TEXTURE0);
     glGenTextures(1, &texture);
     glBindTexture(GL_TEXTURE_2D, texture);
     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_MIN_FILTER, GL_NEAREST);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
     glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kWidth, kHeight, 0, GL_RGBA,
                  GL_UNSIGNED_BYTE, nullptr);
     glBindTexture(GL_TEXTURE_2D, 0);

     GLuint stencil_rb = 0;
     glGenRenderbuffers(1, &stencil_rb);
     glBindRenderbuffer(GL_RENDERBUFFER, stencil_rb);

     if (fbo_type == MixedSampleFBO) {
       // Create a sample buffer.
       GLsizei num_samples = 8, max_samples = 0;
       glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
       num_samples = std::min(num_samples, max_samples);
       glRenderbufferStorageMultisampleCHROMIUM(
           GL_RENDERBUFFER, num_samples, GL_STENCIL_INDEX8, kWidth, kHeight);
       GLint param = 0;
       glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES,
                                    &param);
       EXPECT_GT(param, 1);
     } else {
       glRenderbufferStorage(GL_RENDERBUFFER, GL_STENCIL_INDEX8, kWidth,
                             kHeight);
     }
     glBindRenderbuffer(GL_RENDERBUFFER, 0);

     GLuint sample_fbo = 0;
     glGenFramebuffers(1, &sample_fbo);
     glBindFramebuffer(GL_FRAMEBUFFER, sample_fbo);
     glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
                            texture, 0);
     glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
                               GL_RENDERBUFFER, stencil_rb);
     EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
               glCheckFramebufferStatus(GL_FRAMEBUFFER));

     glViewport(0, 0, kWidth, kHeight);
     glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
     glClearStencil(1);
     glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
     glEnable(GL_STENCIL_TEST);
     glEnable(GL_BLEND);
     glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
     glStencilMask(0xffffffff);
     glStencilFunc(GL_EQUAL, 1, 0xffffffff);
     glStencilOp(GL_KEEP, GL_KEEP, GL_ZERO);
   }

   GLManager gl_;
   GLint color_loc_;
 };

 TEST_F(CHROMIUMFramebufferMixedSamplesTest, Simple) {
   if (!IsApplicable()) {
     return;
   }
   GLint value = -1;
   glGetIntegerv(GL_COVERAGE_MODULATION_CHROMIUM, &value);
   EXPECT_EQ(0, value);
   GLenum kValues[] = {GL_NONE, GL_RGB, GL_RGBA, GL_ALPHA};
   for (auto expect : kValues) {
     glCoverageModulationCHROMIUM(expect);
     value = -1;
     glGetIntegerv(GL_COVERAGE_MODULATION_CHROMIUM, &value);
     EXPECT_EQ(expect, static_cast<GLenum>(value));
     EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
   }

   glCoverageModulationCHROMIUM(GL_BYTE);
   EXPECT_EQ(static_cast<GLenum>(GL_INVALID_ENUM), glGetError());
   value = -1;
   glGetIntegerv(GL_COVERAGE_MODULATION_CHROMIUM, &value);
   EXPECT_EQ(static_cast<GLenum>(GL_ALPHA), static_cast<GLenum>(value));
   EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
 }

 // The test pattern is as follows:
 // A green triangle (bottom left, top right, top left).
 // A blue triangle (top left, bottom right, bottom left).
 // The triangles will overlap but overlap only contains green pixels,
 // due to each draw erasing its area from stencil.
 // The blue triangle will fill only the area (bottom left, center,
 // bottom right).

 // The test tests that CoverageModulation call works.
 // The fractional pixels of both triangles end up being modulated
 // by the coverage of the fragment. Test that drawing with and without
 // CoverageModulation causes the result to be different.
 TEST_F(CHROMIUMFramebufferMixedSamplesTest, CoverageModulation) {
   if (!IsApplicable()) {
     return;
   }
   static const float kBlue[] = {0.0f, 0.0f, 1.0f, 1.0f};
   static const float kGreen[] = {0.0f, 1.0f, 0.0f, 1.0f};
   std::unique_ptr<uint8_t[]> results[3];
   const GLint kResultSize = kWidth * kHeight * 4;

   for (int pass = 0; pass < 3; ++pass) {
     SetupState(MixedSampleFBO);
     if (pass == 1) {
       glCoverageModulationCHROMIUM(GL_RGBA);
     }
     glUniform4fv(color_loc_, 1, kGreen);
     glDrawArrays(GL_TRIANGLES, 0, 3);

     glUniform4fv(color_loc_, 1, kBlue);
     glDrawArrays(GL_TRIANGLES, 3, 3);
     if (pass == 1) {
       glCoverageModulationCHROMIUM(GL_NONE);
     }

     results[pass].reset(new uint8_t[kResultSize]);
     memset(results[pass].get(), GLTestHelper::kCheckClearValue, kResultSize);
     glReadPixels(0, 0, kWidth, kHeight, GL_RGBA, GL_UNSIGNED_BYTE,
                  results[pass].get());
   }

   EXPECT_NE(0, memcmp(results[0].get(), results[1].get(), kResultSize));
   // Verify that rendering is deterministic, so that the pass above does not
   // come from non-deterministic rendering.
   EXPECT_EQ(0, memcmp(results[0].get(), results[2].get(), kResultSize));
 }

 // The test tests that the stencil buffer can be multisampled, even though the
 // color buffer is single-sampled. Draws the same pattern with single-sample
 // stencil buffer and with multisample stencil buffer. The images should differ.
 TEST_F(CHROMIUMFramebufferMixedSamplesTest, MultisampleStencilEffective) {
   if (!IsApplicable()) {
     return;
   }

   static const float kBlue[] = {0.0f, 0.0f, 1.0f, 1.0f};
   static const float kGreen[] = {0.0f, 1.0f, 0.0f, 1.0f};

   std::unique_ptr<uint8_t[]> results[3];
   const GLint kResultSize = kWidth * kHeight * 4;

   for (int pass = 0; pass < 3; ++pass) {
     if (pass == 1) {
       SetupState(MixedSampleFBO);
     } else {
       SetupState(SingleSampleFBO);
     }
     glUniform4fv(color_loc_, 1, kGreen);
     glDrawArrays(GL_TRIANGLES, 0, 3);

     glUniform4fv(color_loc_, 1, kBlue);
     glDrawArrays(GL_TRIANGLES, 3, 3);

     results[pass].reset(new uint8_t[kResultSize]);
     memset(results[pass].get(), GLTestHelper::kCheckClearValue, kResultSize);
     glReadPixels(0, 0, kWidth, kHeight, GL_RGBA, GL_UNSIGNED_BYTE,
                  results[pass].get());
   }

   EXPECT_NE(0, memcmp(results[0].get(), results[1].get(), kResultSize));
   // Verify that rendering is deterministic, so that the pass above does not
   // come from non-deterministic rendering.
   EXPECT_EQ(0, memcmp(results[0].get(), results[2].get(), kResultSize));
 }

 }  // namespace gpu
	// Copyright (c) 2015 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include <GLES2/gl2.h>
	#include <GLES2/gl2ext.h>
	#include <GLES2/gl2extchromium.h>
	#include <stdint.h>
	#include <string.h>

	#include <memory>

	#include "base/command_line.h"
	#include "gpu/command_buffer/service/gpu_switches.h"
	#include "gpu/command_buffer/tests/gl_manager.h"
	#include "gpu/command_buffer/tests/gl_test_utils.h"
	#include "testing/gmock/include/gmock/gmock.h"
	#include "testing/gtest/include/gtest/gtest.h"

	#define SHADER(Src) #Src

	namespace gpu {

	class CHROMIUMFramebufferMixedSamplesTest : public testing::Test {
	protected:
	const GLuint kWidth = 100;
	const GLuint kHeight = 100;

	void SetUp() override {
	gl_.Initialize(GLManager::Options());
	}

	void TearDown() override { gl_.Destroy(); }

	bool IsApplicable() const {
	return GLTestHelper::HasExtension(
	"GL_CHROMIUM_framebuffer_mixed_samples") &&
	GLTestHelper::HasExtension("GL_OES_rgb8_rgba8");
	}

	enum SetupFBOType {
	MixedSampleFBO, // 1 color sample, N stencil samples.
	SingleSampleFBO, // 1 color sample, 1 stencil sample.
	};

	void SetupState(SetupFBOType fbo_type) {
	// clang-format off
	static const char* kVertexShaderSource = SHADER(
	attribute mediump vec4 position;
	void main() {
	gl_Position = position;
	});
	static const char* kFragmentShaderSource = SHADER(
	uniform mediump vec4 color;
	void main() {
	gl_FragColor = color;
	});
	// clang-format on
	GLuint program =
	GLTestHelper::LoadProgram(kVertexShaderSource, kFragmentShaderSource);
	glUseProgram(program);
	GLuint position_loc = glGetAttribLocation(program, "position");
	color_loc_ = glGetUniformLocation(program, "color");

	GLuint vbo = 0;
	glGenBuffers(1, &vbo);
	glBindBuffer(GL_ARRAY_BUFFER, vbo);
	static float vertices[] = {
	1.0f, 1.0f, -1.0f, 1.0f, -1.0f, -1.0f, -1.0f, 1.0f, -1.0f,
	-1.0f, 1.0f, -1.0f, -1.0f, -1.0f, 1.0f, -1.0f, 1.0f, 1.0f,
	};
	glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
	glEnableVertexAttribArray(position_loc);
	glVertexAttribPointer(position_loc, 2, GL_FLOAT, GL_FALSE, 0, 0);
	glBindBuffer(GL_ARRAY_BUFFER, 0);

	GLuint texture = 0;
	glActiveTexture(GL_TEXTURE0);
	glGenTextures(1, &texture);
	glBindTexture(GL_TEXTURE_2D, texture);
	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_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, kWidth, kHeight, 0, GL_RGBA,
	GL_UNSIGNED_BYTE, nullptr);
	glBindTexture(GL_TEXTURE_2D, 0);

	GLuint stencil_rb = 0;
	glGenRenderbuffers(1, &stencil_rb);
	glBindRenderbuffer(GL_RENDERBUFFER, stencil_rb);

	if (fbo_type == MixedSampleFBO) {
	// Create a sample buffer.
	GLsizei num_samples = 8, max_samples = 0;
	glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
	num_samples = std::min(num_samples, max_samples);
	glRenderbufferStorageMultisampleCHROMIUM(
	GL_RENDERBUFFER, num_samples, GL_STENCIL_INDEX8, kWidth, kHeight);
	GLint param = 0;
	glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_SAMPLES,
	&param);
	EXPECT_GT(param, 1);
	} else {
	glRenderbufferStorage(GL_RENDERBUFFER, GL_STENCIL_INDEX8, kWidth,
	kHeight);
	}
	glBindRenderbuffer(GL_RENDERBUFFER, 0);

	GLuint sample_fbo = 0;
	glGenFramebuffers(1, &sample_fbo);
	glBindFramebuffer(GL_FRAMEBUFFER, sample_fbo);
	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
	texture, 0);
	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
	GL_RENDERBUFFER, stencil_rb);
	EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
	glCheckFramebufferStatus(GL_FRAMEBUFFER));

	glViewport(0, 0, kWidth, kHeight);
	glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
	glClearStencil(1);
	glClear(GL_COLOR_BUFFER_BIT \| GL_STENCIL_BUFFER_BIT);
	glEnable(GL_STENCIL_TEST);
	glEnable(GL_BLEND);
	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	glStencilMask(0xffffffff);
	glStencilFunc(GL_EQUAL, 1, 0xffffffff);
	glStencilOp(GL_KEEP, GL_KEEP, GL_ZERO);
	}

	GLManager gl_;
	GLint color_loc_;
	};

	TEST_F(CHROMIUMFramebufferMixedSamplesTest, Simple) {
	if (!IsApplicable()) {
	return;
	}
	GLint value = -1;
	glGetIntegerv(GL_COVERAGE_MODULATION_CHROMIUM, &value);
	EXPECT_EQ(0, value);
	GLenum kValues[] = {GL_NONE, GL_RGB, GL_RGBA, GL_ALPHA};
	for (auto expect : kValues) {
	glCoverageModulationCHROMIUM(expect);
	value = -1;
	glGetIntegerv(GL_COVERAGE_MODULATION_CHROMIUM, &value);
	EXPECT_EQ(expect, static_cast<GLenum>(value));
	EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
	}

	glCoverageModulationCHROMIUM(GL_BYTE);
	EXPECT_EQ(static_cast<GLenum>(GL_INVALID_ENUM), glGetError());
	value = -1;
	glGetIntegerv(GL_COVERAGE_MODULATION_CHROMIUM, &value);
	EXPECT_EQ(static_cast<GLenum>(GL_ALPHA), static_cast<GLenum>(value));
	EXPECT_EQ(static_cast<GLenum>(GL_NO_ERROR), glGetError());
	}

	// The test pattern is as follows:
	// A green triangle (bottom left, top right, top left).
	// A blue triangle (top left, bottom right, bottom left).
	// The triangles will overlap but overlap only contains green pixels,
	// due to each draw erasing its area from stencil.
	// The blue triangle will fill only the area (bottom left, center,
	// bottom right).

	// The test tests that CoverageModulation call works.
	// The fractional pixels of both triangles end up being modulated
	// by the coverage of the fragment. Test that drawing with and without
	// CoverageModulation causes the result to be different.
	TEST_F(CHROMIUMFramebufferMixedSamplesTest, CoverageModulation) {
	if (!IsApplicable()) {
	return;
	}
	static const float kBlue[] = {0.0f, 0.0f, 1.0f, 1.0f};
	static const float kGreen[] = {0.0f, 1.0f, 0.0f, 1.0f};
	std::unique_ptr<uint8_t[]> results[3];
	const GLint kResultSize = kWidth * kHeight * 4;

	for (int pass = 0; pass < 3; ++pass) {
	SetupState(MixedSampleFBO);
	if (pass == 1) {
	glCoverageModulationCHROMIUM(GL_RGBA);
	}
	glUniform4fv(color_loc_, 1, kGreen);
	glDrawArrays(GL_TRIANGLES, 0, 3);

	glUniform4fv(color_loc_, 1, kBlue);
	glDrawArrays(GL_TRIANGLES, 3, 3);
	if (pass == 1) {
	glCoverageModulationCHROMIUM(GL_NONE);
	}

	results[pass].reset(new uint8_t[kResultSize]);
	memset(results[pass].get(), GLTestHelper::kCheckClearValue, kResultSize);
	glReadPixels(0, 0, kWidth, kHeight, GL_RGBA, GL_UNSIGNED_BYTE,
	results[pass].get());
	}

	EXPECT_NE(0, memcmp(results[0].get(), results[1].get(), kResultSize));
	// Verify that rendering is deterministic, so that the pass above does not
	// come from non-deterministic rendering.
	EXPECT_EQ(0, memcmp(results[0].get(), results[2].get(), kResultSize));
	}

	// The test tests that the stencil buffer can be multisampled, even though the
	// color buffer is single-sampled. Draws the same pattern with single-sample
	// stencil buffer and with multisample stencil buffer. The images should differ.
	TEST_F(CHROMIUMFramebufferMixedSamplesTest, MultisampleStencilEffective) {
	if (!IsApplicable()) {
	return;
	}

	static const float kBlue[] = {0.0f, 0.0f, 1.0f, 1.0f};
	static const float kGreen[] = {0.0f, 1.0f, 0.0f, 1.0f};

	std::unique_ptr<uint8_t[]> results[3];
	const GLint kResultSize = kWidth * kHeight * 4;

	for (int pass = 0; pass < 3; ++pass) {
	if (pass == 1) {
	SetupState(MixedSampleFBO);
	} else {
	SetupState(SingleSampleFBO);
	}
	glUniform4fv(color_loc_, 1, kGreen);
	glDrawArrays(GL_TRIANGLES, 0, 3);

	glUniform4fv(color_loc_, 1, kBlue);
	glDrawArrays(GL_TRIANGLES, 3, 3);

	results[pass].reset(new uint8_t[kResultSize]);
	memset(results[pass].get(), GLTestHelper::kCheckClearValue, kResultSize);
	glReadPixels(0, 0, kWidth, kHeight, GL_RGBA, GL_UNSIGNED_BYTE,
	results[pass].get());
	}

	EXPECT_NE(0, memcmp(results[0].get(), results[1].get(), kResultSize));
	// Verify that rendering is deterministic, so that the pass above does not
	// come from non-deterministic rendering.
	EXPECT_EQ(0, memcmp(results[0].get(), results[2].get(), kResultSize));
	}

	} // namespace gpu