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

 // Copyright 2013 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 "gpu/command_buffer/tests/gl_manager.h"
 #include "gpu/command_buffer/tests/gl_test_utils.h"
 #include "testing/gtest/include/gtest/gtest.h"

 #define SHADER(src) #src

 namespace gpu {

 static const uint16_t kRedMask = 0xF800;
 static const uint16_t kGreenMask = 0x07E0;
 static const uint16_t kBlueMask = 0x001F;

 // Color palette in 565 format.
 static const uint16_t kPalette[] = {
     kGreenMask | kBlueMask,  // Cyan.
     kBlueMask | kRedMask,    // Magenta.
     kRedMask | kGreenMask,   // Yellow.
     0x0000,                  // Black.
     kRedMask,                // Red.
     kGreenMask,              // Green.
     kBlueMask,               // Blue.
     0xFFFF,                  // White.
 };
 static const unsigned kBlockSize = 4;
 static const unsigned kPaletteSize = sizeof(kPalette) / sizeof(kPalette[0]);
 static const unsigned kTextureWidth = kBlockSize * kPaletteSize;
 static const unsigned kTextureHeight = kBlockSize;

 static const char* extension(GLenum format) {
   switch(format) {
     case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
     case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
       return "GL_EXT_texture_compression_dxt1";
     case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
       return "GL_CHROMIUM_texture_compression_dxt3";
     case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
       return "GL_CHROMIUM_texture_compression_dxt5";
     default:
       NOTREACHED();
   }
   return NULL;
 }

 // Index that chooses the given colors (color_0 and color_1),
 // not the interpolated colors (color_2 and color_3).
 static const uint16_t kColor0 = 0x0000;
 static const uint16_t kColor1 = 0x5555;

 static GLuint LoadCompressedTexture(const void* data,
                                     GLsizeiptr size,
                                     GLenum format,
                                     GLsizei width,
                                     GLsizei height) {
   GLuint texture;
   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);
   glCompressedTexImage2D(
       GL_TEXTURE_2D, 0, format, width, height, 0, size, data);
   return texture;
 }

 GLuint LoadTextureDXT1(bool alpha) {
   const unsigned kStride = 4;
   uint16_t data[kStride * kPaletteSize];
   for (unsigned i = 0; i < kPaletteSize; ++i) {
     // Each iteration defines a 4x4 block of texture.
     unsigned j = kStride * i;
     data[j++] = kPalette[i];  // color_0.
     data[j++] = kPalette[i];  // color_1.
     data[j++] = kColor0;  // color index.
     data[j++] = kColor1;  // color index.
   }
   GLenum format = alpha ?
       GL_COMPRESSED_RGBA_S3TC_DXT1_EXT : GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
   return LoadCompressedTexture(
       data, sizeof(data), format, kTextureWidth, kTextureHeight);
 }

 GLuint LoadTextureDXT3() {
   const unsigned kStride = 8;
   const uint16_t kOpaque = 0xFFFF;
   uint16_t data[kStride * kPaletteSize];
   for (unsigned i = 0; i < kPaletteSize; ++i) {
     // Each iteration defines a 4x4 block of texture.
     unsigned j = kStride * i;
     data[j++] = kOpaque;  // alpha row 0.
     data[j++] = kOpaque;  // alpha row 1.
     data[j++] = kOpaque;  // alpha row 2.
     data[j++] = kOpaque;  // alpha row 3.
     data[j++] = kPalette[i];  // color_0.
     data[j++] = kPalette[i];  // color_1.
     data[j++] = kColor0;  // color index.
     data[j++] = kColor1;  // color index.
   }
   return LoadCompressedTexture(data,
                                sizeof(data),
                                GL_COMPRESSED_RGBA_S3TC_DXT3_EXT,
                                kTextureWidth,
                                kTextureHeight);
 }

 GLuint LoadTextureDXT5() {
   const unsigned kStride = 8;
   const uint16_t kClear = 0x0000;
   const uint16_t kAlpha7 = 0xFFFF;  // Opaque alpha index.
   uint16_t data[kStride * kPaletteSize];
   for (unsigned i = 0; i < kPaletteSize; ++i) {
     // Each iteration defines a 4x4 block of texture.
     unsigned j = kStride * i;
     data[j++] = kClear;  // alpha_0 | alpha_1.
     data[j++] = kAlpha7;  // alpha index.
     data[j++] = kAlpha7;  // alpha index.
     data[j++] = kAlpha7;  // alpha index.
     data[j++] = kPalette[i];  // color_0.
     data[j++] = kPalette[i];  // color_1.
     data[j++] = kColor0;  // color index.
     data[j++] = kColor1;  // color index.
   }
   return LoadCompressedTexture(data,
                                sizeof(data),
                                GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,
                                kTextureWidth,
                                kTextureHeight);
 }

 static void ToRGB888(uint16_t rgb565, uint8_t rgb888[]) {
   uint8_t r5 = (rgb565 & kRedMask) >> 11;
   uint8_t g6 = (rgb565 & kGreenMask) >> 5;
   uint8_t b5 = (rgb565 & kBlueMask);
   // Replicate upper bits to lower empty bits.
   rgb888[0] = (r5 << 3) | (r5 >> 2);
   rgb888[1] = (g6 << 2) | (g6 >> 4);
   rgb888[2] = (b5 << 3) | (b5 >> 2);
 }

 class CompressedTextureTest : public ::testing::TestWithParam<GLenum> {
  protected:
   void SetUp() override {
     GLManager::Options options;
     options.size = gfx::Size(kTextureWidth, kTextureHeight);
     gl_.Initialize(options);
   }

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

   GLuint LoadProgram() {
     const char* v_shader_src = SHADER(
         attribute vec2 a_position;
         varying vec2 v_texcoord;
         void main() {
           gl_Position = vec4(a_position, 0.0, 1.0);
           v_texcoord = (a_position + 1.0) * 0.5;
         }
     );
     const char* f_shader_src = SHADER(
         precision mediump float;
         uniform sampler2D u_texture;
         varying vec2 v_texcoord;
         void main() {
           gl_FragColor = texture2D(u_texture, v_texcoord);
         }
     );
     return GLTestHelper::LoadProgram(v_shader_src, f_shader_src);
   }

   GLuint LoadTexture(GLenum format) {
     switch (format) {
       case GL_COMPRESSED_RGB_S3TC_DXT1_EXT: return LoadTextureDXT1(false);
       case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT: return LoadTextureDXT1(true);
       case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT: return LoadTextureDXT3();
       case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT: return LoadTextureDXT5();
       default: NOTREACHED();
     }
     return 0;
   }

  private:
   GLManager gl_;
 };

 // The test draws a texture in the given format and verifies that the drawn
 // pixels are of the same color as the texture.
 // The texture consists of 4x4 blocks of texels (same as DXT), one for each
 // color defined in kPalette.
 TEST_P(CompressedTextureTest, Draw) {
   GLenum format = GetParam();

   // This test is only valid if compressed texture extension is supported.
   const char* ext = extension(format);
   if (!GLTestHelper::HasExtension(ext))
     return;

   // Load shader program.
   GLuint program = LoadProgram();
   ASSERT_NE(program, 0u);
   GLint position_loc = glGetAttribLocation(program, "a_position");
   GLint texture_loc = glGetUniformLocation(program, "u_texture");
   ASSERT_NE(position_loc, -1);
   ASSERT_NE(texture_loc, -1);
   glUseProgram(program);

   // Load geometry.
   GLuint vbo = GLTestHelper::SetupUnitQuad(position_loc);
   ASSERT_NE(vbo, 0u);

   // Load texture.
   GLuint texture = LoadTexture(format);
   ASSERT_NE(texture, 0u);
   glActiveTexture(GL_TEXTURE0);
   glBindTexture(GL_TEXTURE_2D, texture);
   glUniform1i(texture_loc, 0);

   // Draw.
   glDrawArrays(GL_TRIANGLES, 0, 6);
   glFlush();

   // Verify results.
   int origin[] = {0, 0};
   uint8_t expected_rgba[] = {0, 0, 0, 255};
   for (unsigned i = 0; i < kPaletteSize; ++i) {
     origin[0] = kBlockSize * i;
     ToRGB888(kPalette[i], expected_rgba);
     EXPECT_TRUE(GLTestHelper::CheckPixels(origin[0], origin[1],
                                           kBlockSize, kBlockSize,
                                           0, expected_rgba));
   }
   GLTestHelper::CheckGLError("CompressedTextureTest.Draw", __LINE__);
 }

 static const GLenum kFormats[] = {
   GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
   GL_COMPRESSED_RGBA_S3TC_DXT1_EXT,
   GL_COMPRESSED_RGBA_S3TC_DXT3_EXT,
   GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
 };
 INSTANTIATE_TEST_CASE_P(Format,
                         CompressedTextureTest,
                         ::testing::ValuesIn(kFormats));

 }  // namespace gpu
	// Copyright 2013 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 "gpu/command_buffer/tests/gl_manager.h"
	#include "gpu/command_buffer/tests/gl_test_utils.h"
	#include "testing/gtest/include/gtest/gtest.h"

	#define SHADER(src) #src

	namespace gpu {

	static const uint16_t kRedMask = 0xF800;
	static const uint16_t kGreenMask = 0x07E0;
	static const uint16_t kBlueMask = 0x001F;

	// Color palette in 565 format.
	static const uint16_t kPalette[] = {
	kGreenMask \| kBlueMask, // Cyan.
	kBlueMask \| kRedMask, // Magenta.
	kRedMask \| kGreenMask, // Yellow.
	0x0000, // Black.
	kRedMask, // Red.
	kGreenMask, // Green.
	kBlueMask, // Blue.
	0xFFFF, // White.
	};
	static const unsigned kBlockSize = 4;
	static const unsigned kPaletteSize = sizeof(kPalette) / sizeof(kPalette[0]);
	static const unsigned kTextureWidth = kBlockSize * kPaletteSize;
	static const unsigned kTextureHeight = kBlockSize;

	static const char* extension(GLenum format) {
	switch(format) {
	case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
	case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
	return "GL_EXT_texture_compression_dxt1";
	case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
	return "GL_CHROMIUM_texture_compression_dxt3";
	case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
	return "GL_CHROMIUM_texture_compression_dxt5";
	default:
	NOTREACHED();
	}
	return NULL;
	}

	// Index that chooses the given colors (color_0 and color_1),
	// not the interpolated colors (color_2 and color_3).
	static const uint16_t kColor0 = 0x0000;
	static const uint16_t kColor1 = 0x5555;

	static GLuint LoadCompressedTexture(const void* data,
	GLsizeiptr size,
	GLenum format,
	GLsizei width,
	GLsizei height) {
	GLuint texture;
	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);
	glCompressedTexImage2D(
	GL_TEXTURE_2D, 0, format, width, height, 0, size, data);
	return texture;
	}

	GLuint LoadTextureDXT1(bool alpha) {
	const unsigned kStride = 4;
	uint16_t data[kStride * kPaletteSize];
	for (unsigned i = 0; i < kPaletteSize; ++i) {
	// Each iteration defines a 4x4 block of texture.
	unsigned j = kStride * i;
	data[j++] = kPalette[i]; // color_0.
	data[j++] = kPalette[i]; // color_1.
	data[j++] = kColor0; // color index.
	data[j++] = kColor1; // color index.
	}
	GLenum format = alpha ?
	GL_COMPRESSED_RGBA_S3TC_DXT1_EXT : GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
	return LoadCompressedTexture(
	data, sizeof(data), format, kTextureWidth, kTextureHeight);
	}

	GLuint LoadTextureDXT3() {
	const unsigned kStride = 8;
	const uint16_t kOpaque = 0xFFFF;
	uint16_t data[kStride * kPaletteSize];
	for (unsigned i = 0; i < kPaletteSize; ++i) {
	// Each iteration defines a 4x4 block of texture.
	unsigned j = kStride * i;
	data[j++] = kOpaque; // alpha row 0.
	data[j++] = kOpaque; // alpha row 1.
	data[j++] = kOpaque; // alpha row 2.
	data[j++] = kOpaque; // alpha row 3.
	data[j++] = kPalette[i]; // color_0.
	data[j++] = kPalette[i]; // color_1.
	data[j++] = kColor0; // color index.
	data[j++] = kColor1; // color index.
	}
	return LoadCompressedTexture(data,
	sizeof(data),
	GL_COMPRESSED_RGBA_S3TC_DXT3_EXT,
	kTextureWidth,
	kTextureHeight);
	}

	GLuint LoadTextureDXT5() {
	const unsigned kStride = 8;
	const uint16_t kClear = 0x0000;
	const uint16_t kAlpha7 = 0xFFFF; // Opaque alpha index.
	uint16_t data[kStride * kPaletteSize];
	for (unsigned i = 0; i < kPaletteSize; ++i) {
	// Each iteration defines a 4x4 block of texture.
	unsigned j = kStride * i;
	data[j++] = kClear; // alpha_0 \| alpha_1.
	data[j++] = kAlpha7; // alpha index.
	data[j++] = kAlpha7; // alpha index.
	data[j++] = kAlpha7; // alpha index.
	data[j++] = kPalette[i]; // color_0.
	data[j++] = kPalette[i]; // color_1.
	data[j++] = kColor0; // color index.
	data[j++] = kColor1; // color index.
	}
	return LoadCompressedTexture(data,
	sizeof(data),
	GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,
	kTextureWidth,
	kTextureHeight);
	}

	static void ToRGB888(uint16_t rgb565, uint8_t rgb888[]) {
	uint8_t r5 = (rgb565 & kRedMask) >> 11;
	uint8_t g6 = (rgb565 & kGreenMask) >> 5;
	uint8_t b5 = (rgb565 & kBlueMask);
	// Replicate upper bits to lower empty bits.
	rgb888[0] = (r5 << 3) \| (r5 >> 2);
	rgb888[1] = (g6 << 2) \| (g6 >> 4);
	rgb888[2] = (b5 << 3) \| (b5 >> 2);
	}

	class CompressedTextureTest : public ::testing::TestWithParam<GLenum> {
	protected:
	void SetUp() override {
	GLManager::Options options;
	options.size = gfx::Size(kTextureWidth, kTextureHeight);
	gl_.Initialize(options);
	}

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

	GLuint LoadProgram() {
	const char* v_shader_src = SHADER(
	attribute vec2 a_position;
	varying vec2 v_texcoord;
	void main() {
	gl_Position = vec4(a_position, 0.0, 1.0);
	v_texcoord = (a_position + 1.0) * 0.5;
	}
	);
	const char* f_shader_src = SHADER(
	precision mediump float;
	uniform sampler2D u_texture;
	varying vec2 v_texcoord;
	void main() {
	gl_FragColor = texture2D(u_texture, v_texcoord);
	}
	);
	return GLTestHelper::LoadProgram(v_shader_src, f_shader_src);
	}

	GLuint LoadTexture(GLenum format) {
	switch (format) {
	case GL_COMPRESSED_RGB_S3TC_DXT1_EXT: return LoadTextureDXT1(false);
	case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT: return LoadTextureDXT1(true);
	case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT: return LoadTextureDXT3();
	case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT: return LoadTextureDXT5();
	default: NOTREACHED();
	}
	return 0;
	}

	private:
	GLManager gl_;
	};

	// The test draws a texture in the given format and verifies that the drawn
	// pixels are of the same color as the texture.
	// The texture consists of 4x4 blocks of texels (same as DXT), one for each
	// color defined in kPalette.
	TEST_P(CompressedTextureTest, Draw) {
	GLenum format = GetParam();

	// This test is only valid if compressed texture extension is supported.
	const char* ext = extension(format);
	if (!GLTestHelper::HasExtension(ext))
	return;

	// Load shader program.
	GLuint program = LoadProgram();
	ASSERT_NE(program, 0u);
	GLint position_loc = glGetAttribLocation(program, "a_position");
	GLint texture_loc = glGetUniformLocation(program, "u_texture");
	ASSERT_NE(position_loc, -1);
	ASSERT_NE(texture_loc, -1);
	glUseProgram(program);

	// Load geometry.
	GLuint vbo = GLTestHelper::SetupUnitQuad(position_loc);
	ASSERT_NE(vbo, 0u);

	// Load texture.
	GLuint texture = LoadTexture(format);
	ASSERT_NE(texture, 0u);
	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_2D, texture);
	glUniform1i(texture_loc, 0);

	// Draw.
	glDrawArrays(GL_TRIANGLES, 0, 6);
	glFlush();

	// Verify results.
	int origin[] = {0, 0};
	uint8_t expected_rgba[] = {0, 0, 0, 255};
	for (unsigned i = 0; i < kPaletteSize; ++i) {
	origin[0] = kBlockSize * i;
	ToRGB888(kPalette[i], expected_rgba);
	EXPECT_TRUE(GLTestHelper::CheckPixels(origin[0], origin[1],
	kBlockSize, kBlockSize,
	0, expected_rgba));
	}
	GLTestHelper::CheckGLError("CompressedTextureTest.Draw", __LINE__);
	}

	static const GLenum kFormats[] = {
	GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
	GL_COMPRESSED_RGBA_S3TC_DXT1_EXT,
	GL_COMPRESSED_RGBA_S3TC_DXT3_EXT,
	GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
	};
	INSTANTIATE_TEST_CASE_P(Format,
	CompressedTextureTest,
	::testing::ValuesIn(kFormats));

	} // namespace gpu