gpu: fix CopyTextureCHROMIUM for immutable texture.

gpu/command_buffer/tests/gl_copy_texture_CHROMIUM_unittest.cc

 // 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>
@@ skipping 58 matching lines @@
   EXPECT_EQ(framebuffer_id_, fb_id);
 
   // Check that FB is complete.
   EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
             glCheckFramebufferStatus(GL_FRAMEBUFFER));
 
   GLTestHelper::CheckPixels(0, 0, 1, 1, 0, pixels);
   EXPECT_TRUE(GL_NO_ERROR == glGetError());
 }
 
+TEST_F(GLCopyTextureCHROMIUMTest, ImmutableTexture) {
+  if (!GLTestHelper::HasExtension("GL_EXT_texture_storage")) {

[no sievers, 2014/11/21 18:39:49]

nit: can you put LOG(INFO) << "GL_EXT_texture_storage not supported. Skipping
test..."?

+    return;
+  }
+
+  uint8 pixels[1 * 4] = {255u, 0u, 0u, 255u};
+
+  glBindTexture(GL_TEXTURE_2D, textures_[0]);
+  glTexStorage2DEXT(GL_TEXTURE_2D, 1, GL_RGBA8_OES, 1, 1);
+  glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 1, 1, GL_RGBA, GL_UNSIGNED_BYTE,
+                  pixels);
+
+  glBindTexture(GL_TEXTURE_2D, textures_[1]);
+  glTexStorage2DEXT(GL_TEXTURE_2D, 1, GL_RGBA8_OES, 1, 1);
+  glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D,
+                         textures_[1], 0);
+  EXPECT_TRUE(glGetError() == GL_NO_ERROR);
+
+  glCopyTextureCHROMIUM(GL_TEXTURE_2D, textures_[0], textures_[1], 0, GL_RGBA,
+                        GL_UNSIGNED_BYTE);
+  EXPECT_TRUE(glGetError() == GL_NO_ERROR);
+
+  // Check the FB is still bound.
+  GLint value = 0;
+  glGetIntegerv(GL_FRAMEBUFFER_BINDING, &value);
+  GLuint fb_id = value;
+  EXPECT_EQ(framebuffer_id_, fb_id);
+
+  // Check that FB is complete.
+  EXPECT_EQ(static_cast<GLenum>(GL_FRAMEBUFFER_COMPLETE),
+            glCheckFramebufferStatus(GL_FRAMEBUFFER));
+
+  GLTestHelper::CheckPixels(0, 0, 1, 1, 0, pixels);
+  EXPECT_TRUE(GL_NO_ERROR == glGetError());
+}
+
 TEST_F(GLCopyTextureCHROMIUMTest, InternalFormat) {
   GLint src_formats[] = {GL_ALPHA,     GL_RGB,             GL_RGBA,
                          GL_LUMINANCE, GL_LUMINANCE_ALPHA, GL_BGRA_EXT};
   GLint dest_formats[] = {GL_RGB, GL_RGBA};
 
   for (size_t src_index = 0; src_index < arraysize(src_formats); src_index++) {
     for (size_t dest_index = 0; dest_index < arraysize(dest_formats);
          dest_index++) {
       glBindTexture(GL_TEXTURE_2D, textures_[0]);
       glTexImage2D(GL_TEXTURE_2D,
@@ skipping 534 matching lines @@
       EXPECT_EQ(0, pixels[y][x][1]);
       EXPECT_EQ(0, pixels[y][x][2]);
       EXPECT_EQ(0, pixels[y][x][3]);
     }
   }
 
   EXPECT_TRUE(GL_NO_ERROR == glGetError());
 }
 
 }  // namespace gpu