Add glCopyCompressedTextureCHROMIUM

gpu/command_buffer/tests/gl_compressed_copy_texture_CHROMIUM_unittest.cc

Index: gpu/command_buffer/tests/gl_compressed_copy_texture_CHROMIUM_unittest.cc
diff --git a/gpu/command_buffer/tests/gl_compressed_copy_texture_CHROMIUM_unittest.cc b/gpu/command_buffer/tests/gl_compressed_copy_texture_CHROMIUM_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..369d5ac0b2d10ddab9b9e0387cdf980739f0e728
--- /dev/null
+++ b/gpu/command_buffer/tests/gl_compressed_copy_texture_CHROMIUM_unittest.cc
@@ -0,0 +1,365 @@
+// 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.
+
+#ifndef GL_GLEXT_PROTOTYPES
+#define GL_GLEXT_PROTOTYPES
+#endif
+
+#include <GLES2/gl2.h>
+#include <GLES2/gl2ext.h>
+#include <GLES2/gl2extchromium.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 {
+
+namespace {
+
+const uint8 kCompressedImageColor[4] = { 255u, 0u, 0u, 255u };
+
+// Single compressed ATC block of source pixels all set to:
+// kCompressedImageColor.
+const uint8 kCompressedImageATC[8] = {
+    0x0, 0x7c, 0x0, 0xf8, 0x55, 0x55, 0x55, 0x55 };
+
+// Single compressed ATCIA block of source pixels all set to:
+// kCompressedImageColor.
+const uint8 kCompressedImageATCIA[16] = {
+    0xff, 0xff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0x7c, 0x0, 0xf8, 0x55, 0x55, 0x55, 0x55 };
+
+// Single compressed DXT1 block of source pixels all set to:
+// kCompressedImageColor.
+const uint8 kCompressedImageDXT1[8] = {
+    0x00, 0xf8, 0x00, 0xf8, 0xaa, 0xaa, 0xaa, 0xaa };
+
+// Single compressed DXT5 block of source pixels all set to:
+// kCompressedImageColor.
+const uint8 kCompressedImageDXT5[16] = {
+    0xff, 0xff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+    0xf8, 0x0, 0xf8, 0xaa, 0xaa, 0xaa, 0xaa };
+
+// Single compressed DXT1 block of source pixels all set to:
+// kCompressedImageColor.
+const uint8 kCompressedImageETC1[8] = {
+    0x0, 0x0, 0xf8, 0x2, 0xff, 0xff, 0x0, 0x0 };
+
+void glEnableDisable(GLint param, GLboolean value) {
+  if (value)
+    glEnable(param);
+  else
+    glDisable(param);
+}
+
+}  // unnamed namespace
+
+// A collection of tests that exercise the GL_CHROMIUM_copy_texture extension.
+class GLCompressedCopyTextureCHROMIUMTest
+    : public testing::Test {
+ protected:
+  void SetUp() override {
+    gl_.Initialize(GLManager::Options());
+
+    glGenTextures(2, textures_);
+  }
+
+  void TearDown() override {
+    glDeleteTextures(2, textures_);
+    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);
+  }
+
+  GLManager gl_;
+  GLuint textures_[2];
+  GLuint framebuffer_id_;
+};
+
+// Test to ensure that the basic functionality of the extension works.
+TEST_F(GLCompressedCopyTextureCHROMIUMTest, Basic) {
+  if (!GLTestHelper::HasExtension("GL_EXT_texture_compression_dxt1")) {
+    LOG(INFO) <<
+        "GL_EXT_texture_compression_dxt1 not supported. Skipping test...";
+    return;
+  }
+
+  glBindTexture(GL_TEXTURE_2D, textures_[0]);
+  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, GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
+                         4, 4, 0,
+                         sizeof(kCompressedImageDXT1), kCompressedImageDXT1);
+  EXPECT_TRUE(glGetError() == GL_NO_ERROR);
+
+  glBindTexture(GL_TEXTURE_2D, textures_[1]);
+  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameterf(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);
+  glCompressedCopyTextureCHROMIUM(GL_TEXTURE_2D, textures_[0], textures_[1]);
+  EXPECT_TRUE(glGetError() == GL_NO_ERROR);
+
+  // 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.
+  glActiveTexture(GL_TEXTURE0);
+  glBindTexture(GL_TEXTURE_2D, textures_[1]);
+  glUniform1i(texture_loc, 0);
+
+  // Draw.
+  glDrawArrays(GL_TRIANGLES, 0, 6);
+  glFlush();
+
+  GLTestHelper::CheckPixels(0, 0, 4, 4, 0, kCompressedImageColor);
+  EXPECT_TRUE(GL_NO_ERROR == glGetError());
+}
+
+TEST_F(GLCompressedCopyTextureCHROMIUMTest, InternalFormat) {
+  struct Image {
+    const GLint format;
+    const uint8* data;
+    const GLsizei data_size;
+  };
+  std::vector<Image> supported_formats;
+
+  if (GLTestHelper::HasExtension("GL_AMD_compressed_ATC_texture") ||
+      GLTestHelper::HasExtension("GL_ATI_texture_compression_atitc")) {
+    supported_formats.push_back({
+        GL_ATC_RGB_AMD,
+        kCompressedImageATC,
+        sizeof(kCompressedImageATC)});
+    supported_formats.push_back({
+        GL_ATC_RGBA_INTERPOLATED_ALPHA_AMD,
+        kCompressedImageATCIA,
+        sizeof(kCompressedImageATCIA)});
+  }
+  if (GLTestHelper::HasExtension("GL_EXT_texture_compression_dxt1")) {
+    supported_formats.push_back({
+        GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
+        kCompressedImageDXT1,
+        sizeof(kCompressedImageDXT1)});
+  }
+  if (GLTestHelper::HasExtension("GL_ANGLE_texture_compression_dxt5") ||
+      GLTestHelper::HasExtension("GL_EXT_texture_compression_s3tc")) {
+    supported_formats.push_back({
+        GL_COMPRESSED_RGBA_S3TC_DXT5_EXT,
+        kCompressedImageDXT5,
+        sizeof(kCompressedImageDXT5)});
+  }
+  if (GLTestHelper::HasExtension("GL_OES_compressed_ETC1_RGB8_texture")) {
+    supported_formats.push_back({
+        GL_ETC1_RGB8_OES,
+        kCompressedImageETC1,
+        sizeof(kCompressedImageETC1)});
+  }
+
+  for (const Image& image : supported_formats) {
+    glBindTexture(GL_TEXTURE_2D, textures_[0]);
+    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, image.format,
+                           4, 4, 0, image.data_size, image.data);
+    EXPECT_TRUE(GL_NO_ERROR == glGetError());
+
+    glBindTexture(GL_TEXTURE_2D, textures_[1]);
+    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+    glTexParameterf(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);
+    glCompressedCopyTextureCHROMIUM(GL_TEXTURE_2D, textures_[0], textures_[1]);
+    EXPECT_TRUE(GL_NO_ERROR == glGetError());
+  }
+}
+
+TEST_F(GLCompressedCopyTextureCHROMIUMTest, InternalFormatNotSupported) {
+  if (!GLTestHelper::HasExtension("GL_EXT_texture_compression_dxt1")) {
+    LOG(INFO) <<
+        "GL_EXT_texture_compression_dxt1 not supported. Skipping test...";
+    return;
+  }
+
+  const uint8 kUncompressedPixels[1 * 4] = { 255u, 0u, 0u, 255u };
+
+  glBindTexture(GL_TEXTURE_2D, textures_[0]);
+  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, 1, 1, 0, GL_RGBA, GL_UNSIGNED_BYTE,
+               kUncompressedPixels);
+  EXPECT_TRUE(glGetError() == GL_NO_ERROR);
+
+  glBindTexture(GL_TEXTURE_2D, textures_[1]);
+  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameterf(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);
+
+  // Check that the GL_RGBA format reports an error.
+  glCompressedCopyTextureCHROMIUM(GL_TEXTURE_2D, textures_[0], textures_[1]);
+  EXPECT_TRUE(GL_INVALID_OPERATION == glGetError());
+}
+
+// Validate that some basic GL state is not touched upon execution of
+// the extension.
+TEST_F(GLCompressedCopyTextureCHROMIUMTest, BasicStatePreservation) {
+  if (!GLTestHelper::HasExtension("GL_EXT_texture_compression_dxt1")) {
+    LOG(INFO) <<
+        "GL_EXT_texture_compression_dxt1 not supported. Skipping test...";
+    return;
+  }
+
+  glBindTexture(GL_TEXTURE_2D, textures_[0]);
+  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, GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
+                         4, 4, 0,
+                         sizeof(kCompressedImageDXT1), kCompressedImageDXT1);
+  EXPECT_TRUE(glGetError() == GL_NO_ERROR);
+
+  glBindTexture(GL_TEXTURE_2D, textures_[1]);
+  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameterf(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);
+
+  GLboolean reference_settings[2] = { GL_TRUE, GL_FALSE };
+  for (int x = 0; x < 2; ++x) {
+    GLboolean setting = reference_settings[x];
+    glEnableDisable(GL_DEPTH_TEST, setting);
+    glEnableDisable(GL_SCISSOR_TEST, setting);
+    glEnableDisable(GL_STENCIL_TEST, setting);
+    glEnableDisable(GL_CULL_FACE, setting);
+    glEnableDisable(GL_BLEND, setting);
+    glColorMask(setting, setting, setting, setting);
+    glDepthMask(setting);
+
+    glActiveTexture(GL_TEXTURE1 + x);
+
+    glCompressedCopyTextureCHROMIUM(GL_TEXTURE_2D, textures_[0], textures_[1]);
+    EXPECT_TRUE(glGetError() == GL_NO_ERROR);
+
+    EXPECT_EQ(setting, glIsEnabled(GL_DEPTH_TEST));
+    EXPECT_EQ(setting, glIsEnabled(GL_SCISSOR_TEST));
+    EXPECT_EQ(setting, glIsEnabled(GL_STENCIL_TEST));
+    EXPECT_EQ(setting, glIsEnabled(GL_CULL_FACE));
+    EXPECT_EQ(setting, glIsEnabled(GL_BLEND));
+
+    GLboolean bool_array[4] = { GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE };
+    glGetBooleanv(GL_DEPTH_WRITEMASK, bool_array);
+    EXPECT_EQ(setting, bool_array[0]);
+
+    bool_array[0] = GL_FALSE;
+    glGetBooleanv(GL_COLOR_WRITEMASK, bool_array);
+    EXPECT_EQ(setting, bool_array[0]);
+    EXPECT_EQ(setting, bool_array[1]);
+    EXPECT_EQ(setting, bool_array[2]);
+    EXPECT_EQ(setting, bool_array[3]);
+
+    GLint active_texture = 0;
+    glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
+    EXPECT_EQ(GL_TEXTURE1 + x, active_texture);
+  }
+
+  EXPECT_TRUE(GL_NO_ERROR == glGetError());
+};
+
+// Verify that invocation of the extension does not modify the bound
+// texture state.
+TEST_F(GLCompressedCopyTextureCHROMIUMTest, TextureStatePreserved) {
+  if (!GLTestHelper::HasExtension("GL_EXT_texture_compression_dxt1")) {
+    LOG(INFO) <<
+        "GL_EXT_texture_compression_dxt1 not supported. Skipping test...";
+    return;
+  }
+
+  glBindTexture(GL_TEXTURE_2D, textures_[0]);
+  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, GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
+                         4, 4, 0,
+                         sizeof(kCompressedImageDXT1), kCompressedImageDXT1);
+  EXPECT_TRUE(glGetError() == GL_NO_ERROR);
+
+  glBindTexture(GL_TEXTURE_2D, textures_[1]);
+  glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+  glTexParameterf(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);
+
+  GLuint texture_ids[2];
+  glGenTextures(2, texture_ids);
+
+  glActiveTexture(GL_TEXTURE0);
+  glBindTexture(GL_TEXTURE_2D, texture_ids[0]);
+
+  glActiveTexture(GL_TEXTURE1);
+  glBindTexture(GL_TEXTURE_2D, texture_ids[1]);
+
+  glCompressedCopyTextureCHROMIUM(GL_TEXTURE_2D, textures_[0], textures_[1]);
+  EXPECT_TRUE(GL_NO_ERROR == glGetError());
+
+  GLint active_texture = 0;
+  glGetIntegerv(GL_ACTIVE_TEXTURE, &active_texture);
+  EXPECT_EQ(GL_TEXTURE1, active_texture);
+
+  GLint bound_texture = 0;
+  glGetIntegerv(GL_TEXTURE_BINDING_2D, &bound_texture);
+  EXPECT_EQ(texture_ids[1], static_cast<GLuint>(bound_texture));
+  glBindTexture(GL_TEXTURE_2D, 0);
+
+  bound_texture = 0;
+  glActiveTexture(GL_TEXTURE0);
+  glGetIntegerv(GL_TEXTURE_BINDING_2D, &bound_texture);
+  EXPECT_EQ(texture_ids[0], static_cast<GLuint>(bound_texture));
+  glBindTexture(GL_TEXTURE_2D, 0);
+
+  glDeleteTextures(2, texture_ids);
+
+  EXPECT_TRUE(GL_NO_ERROR == glGetError());
+}
+
+}  // namespace gpu