Adds support for compressed textures. DXT1 only.

This is a temporary implementation. The real implementation
will require

*) glGetString to return "GL_EXT_texture_compression_dxt1"

*) CommandBufferEnable("GL_EXT_texture_compression_dxt1") 
to dynamically modify the validation after it has made
sure the "GL_EXT_texture_compression_dxt1" is returned
from the system level GL

TEST=none
BUG=none

Review URL: http://codereview.chromium.org/2136003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@47417 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 30 insertions, 22 deletions

diff --git a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
index 1cbc45f..25394d0 100644
--- a/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
+++ b/gpu/command_buffer/client/gles2_cmd_helper_autogen.h
@@ -175,6 +175,14 @@
     c.Init(target, level, internalformat, width, height, border, imageSize);
   }
 
+  void CompressedTexImage2DBucket(
+      GLenum target, GLint level, GLenum internalformat, GLsizei width,
+      GLsizei height, GLint border, GLuint bucket_id) {
+    gles2::CompressedTexImage2DBucket& c =
+        GetCmdSpace<gles2::CompressedTexImage2DBucket>();
+    c.Init(target, level, internalformat, width, height, border, bucket_id);
+  }
+
   void CompressedTexSubImage2D(
       GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
       GLsizei height, GLenum format, GLsizei imageSize, uint32 data_shm_id,
@@ -196,6 +204,14 @@
     c.Init(target, level, xoffset, yoffset, width, height, format, imageSize);
   }
 
+  void CompressedTexSubImage2DBucket(
+      GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width,
+      GLsizei height, GLenum format, GLuint bucket_id) {
+    gles2::CompressedTexSubImage2DBucket& c =
+        GetCmdSpace<gles2::CompressedTexSubImage2DBucket>();
+    c.Init(target, level, xoffset, yoffset, width, height, format, bucket_id);
+  }
+
   void CopyTexImage2D(
       GLenum target, GLint level, GLenum internalformat, GLint x, GLint y,
       GLsizei width, GLsizei height, GLint border) {
diff --git a/gpu/command_buffer/client/gles2_implementation.cc b/gpu/command_buffer/client/gles2_implementation.cc
index f460329..a74d2982 100644
--- a/gpu/command_buffer/client/gles2_implementation.cc
+++ b/gpu/command_buffer/client/gles2_implementation.cc
@@ -892,17 +892,13 @@ void GLES2Implementation::CompressedTexImage2D(
   if (height == 0 || width == 0) {
     return;
   }
-  // TODO(gman): Switch to use buckets always or at least if no room in shared
-  //    memory.
-  DCHECK_LE(image_size,
-            static_cast<GLsizei>(
-                transfer_buffer_.GetLargestFreeOrPendingSize()));
-  void* buffer = transfer_buffer_.Alloc(image_size);
-  memcpy(buffer, data, image_size);
-  helper_->CompressedTexImage2D(
-      target, level, internalformat, width, height, border, image_size,
-      transfer_buffer_id_, transfer_buffer_.GetOffset(buffer));
-  transfer_buffer_.FreePendingToken(buffer, helper_->InsertToken());
+  SetBucketContents(kResultBucketId, data, image_size);
+  helper_->CompressedTexImage2DBucket(
+      target, level, internalformat, width, height, border, kResultBucketId);
+  // Free the bucket. This is not required but it does free up the memory.
+  // and we don't have to wait for the result so from the client's perspective
+  // it's cheap.
+  helper_->SetBucketSize(kResultBucketId, 0);
 }
 
 void GLES2Implementation::CompressedTexSubImage2D(
@@ -912,17 +908,13 @@ void GLES2Implementation::CompressedTexSubImage2D(
     SetGLError(GL_INVALID_VALUE, "glCompressedTexSubImage2D dimension < 0");
     return;
   }
-  // TODO(gman): Switch to use buckets always or at least if no room in shared
-  //    memory.
-  DCHECK_LE(image_size,
-            static_cast<GLsizei>(
-                transfer_buffer_.GetLargestFreeOrPendingSize()));
-  void* buffer = transfer_buffer_.Alloc(image_size);
-  memcpy(buffer, data, image_size);
-  helper_->CompressedTexSubImage2D(
-      target, level, xoffset, yoffset, width, height, format, image_size,
-      transfer_buffer_id_, transfer_buffer_.GetOffset(buffer));
-  transfer_buffer_.FreePendingToken(buffer, helper_->InsertToken());
+  SetBucketContents(kResultBucketId, data, image_size);
+  helper_->CompressedTexSubImage2DBucket(
+      target, level, xoffset, yoffset, width, height, format, kResultBucketId);
+  // Free the bucket. This is not required but it does free up the memory.
+  // and we don't have to wait for the result so from the client's perspective
+  // it's cheap.
+  helper_->SetBucketSize(kResultBucketId, 0);
 }
 
 void GLES2Implementation::TexImage2D(