Add OES_texture_half_float extension support in Chromium for desktop GL implementation.

gpu/command_buffer/tests/gl_oes_texture_half_float_unittest.cc

Index: gpu/command_buffer/tests/gl_oes_texture_half_float_unittest.cc
diff --git a/gpu/command_buffer/tests/gl_oes_texture_half_float_unittest.cc b/gpu/command_buffer/tests/gl_oes_texture_half_float_unittest.cc
new file mode 100755
index 0000000000000000000000000000000000000000..a5203a45dd559f3dcb5b2eadd30c413da2aca40b
--- /dev/null
+++ b/gpu/command_buffer/tests/gl_oes_texture_half_float_unittest.cc
@@ -0,0 +1,130 @@
+// Copyright (c) 2012 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 "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 {
+
+static const char* v_shader_str = SHADER(
+  attribute vec4 a_position;
+  void main() {
+    gl_Position = a_position;
+  }
+);
+
+static const char* f_shader_str = SHADER(
+  uniform sampler2D u_texture;
+  void main() {
+    gl_FragColor = texture2D(u_texture, vec2(0.5, 0.5)) *
+                             vec4(4.0, 2.0, 0.5, 0.25);
+  }
+);
+
+class GLOesTextureHalfFloatTest : public testing::Test {
+ protected:
+  virtual void SetUp() {
+    gl_.Initialize(GLManager::Options());
+
+    glGenTextures(2, textures);
+    glActiveTexture(GL_TEXTURE0);
+    glBindTexture(GL_TEXTURE_2D, textures[1]);
+
+    // Some drivers (NVidia/SGX) require texture settings to be a certain way or
+    // they won't report FRAMEBUFFER_COMPLETE.
+    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);
+
+    glGenFramebuffers(1, &fbo);
+    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+                           textures[1], 0);
+  }
+
+  virtual void TearDown() {
+    glDeleteTextures(2, textures);
+    glDeleteFramebuffers(1, &fbo);
+    gl_.Destroy();
+  }
+
+  GLManager gl_;
+  GLuint textures[2];
+  GLuint fbo;
+};
+
+TEST_F(GLOesTextureHalfFloatTest, TexImage2DAndTexSubImage2D) {
+  if (!GLTestHelper::HasExtension("GL_OES_texture_half_float")) {
+    return;
+  }
+
+  // (0.25, 0.5, 2.0, 4.0)
+  static int16 pixels[1 * 4] = { 0x3400, 0x3800, 0x4000, 0x4400 };
+  glBindTexture(GL_TEXTURE_2D, textures[0]);
+
+  GLenum formats[5] = { GL_RGBA, GL_RGB, GL_LUMINANCE_ALPHA,
+                          GL_LUMINANCE, GL_ALPHA };
+  for (unsigned int i = 0; i < 5; i++) {
+    glTexImage2D(GL_TEXTURE_2D, 0, formats[i], 1, 1, 0, formats[i],
+                 GL_HALF_FLOAT_OES, pixels);
+    EXPECT_TRUE(glGetError() == GL_NO_ERROR);
+    glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1, 1, formats[i],
+                    GL_HALF_FLOAT_OES, pixels);
+    EXPECT_TRUE(glGetError() == GL_NO_ERROR);
+  }
+}
+
+TEST_F(GLOesTextureHalfFloatTest, OesTextureHalfFloatTest) {
+  if (!GLTestHelper::HasExtension("GL_OES_texture_half_float")) {
+    return;
+  }
+
+  GLuint program = GLTestHelper::LoadProgram(v_shader_str, f_shader_str);
+  glUseProgram(program);
+  EXPECT_TRUE(glGetError() == GL_NO_ERROR);
+
+  GLint position_loc = glGetAttribLocation(program, "a_position");
+  GLTestHelper::SetupUnitQuad(position_loc);
+  EXPECT_TRUE(glGetError() == GL_NO_ERROR);
+
+  glBindTexture(GL_TEXTURE_2D, textures[1]);
+  glTexImage2D(
+      GL_TEXTURE_2D, 0, GL_RGBA, 4, 4,
+      0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
+  EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
+            glCheckFramebufferStatus(GL_FRAMEBUFFER));
+
+  // (0.25, 0.5, 2.0, 4.0)
+  static int16 pixels[1 * 4] = { 0x3400, 0x3800, 0x4000, 0x4400 };
+  glBindTexture(GL_TEXTURE_2D, textures[0]);
+  glTexImage2D(
+      GL_TEXTURE_2D, 0, GL_RGBA, 1, 1,
+      0, GL_RGBA, GL_HALF_FLOAT_OES, pixels);
+  glDrawArrays(GL_TRIANGLES, 0, 6);
+  // check pixels
+  uint8 expect_pixels[1 * 4] = { 255, 255, 255, 255 };
+  GLTestHelper::CheckPixels(0, 0, 4, 4, 0, expect_pixels);
+
+  glTexSubImage2D(
+      GL_TEXTURE_2D, 0, 0, 0, 1, 1,
+      GL_RGBA, GL_HALF_FLOAT_OES, pixels);
+  glDrawArrays(GL_TRIANGLES, 0, 6);
+  // check pixels
+  GLTestHelper::CheckPixels(0, 0, 1, 1, 0, expect_pixels);
+  EXPECT_TRUE(glGetError() == GL_NO_ERROR);
+}
+
+}  // namespace gpu