Offscreen framebuffer creation on Mali-400 GPU

gpu/command_buffer/service/gles2_cmd_decoder.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.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 
 #include <stdio.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 2606 matching lines @@
       const bool rgb8_supported =
           context_->HasExtension("GL_OES_rgb8_rgba8");
       // The only available default render buffer formats in GLES2 have very
       // little precision.  Don't enable multisampling unless 8-bit render
       // buffer formats are available--instead fall back to 8-bit textures.
       if (rgb8_supported && offscreen_target_samples_ > 1) {
         offscreen_target_color_format_ = attrib_parser.alpha_size > 0 ?
             GL_RGBA8 : GL_RGB8;
       } else {
         offscreen_target_samples_ = 1;
-        offscreen_target_color_format_ = attrib_parser.alpha_size > 0 ?
-            GL_RGBA : GL_RGB;
+        offscreen_target_color_format_ =
+            attrib_parser.alpha_size > 0 || workarounds().disable_gl_rgb_format
+                ? GL_RGBA
+                : GL_RGB;
       }
 
       // ANGLE only supports packed depth/stencil formats, so use it if it is
       // available.
       const bool depth24_stencil8_supported =
           feature_info_->feature_flags().packed_depth24_stencil8;
       VLOG(1) << "GL_OES_packed_depth_stencil "
               << (depth24_stencil8_supported ? "" : "not ") << "supported.";
       if ((attrib_parser.depth_size > 0 || attrib_parser.stencil_size > 0) &&
           depth24_stencil8_supported) {
         offscreen_target_depth_format_ = GL_DEPTH24_STENCIL8;
         offscreen_target_stencil_format_ = 0;
       } else {
         // It may be the case that this depth/stencil combination is not
         // supported, but this will be checked later by CheckFramebufferStatus.
         offscreen_target_depth_format_ = attrib_parser.depth_size > 0 ?
             GL_DEPTH_COMPONENT16 : 0;
         offscreen_target_stencil_format_ = attrib_parser.stencil_size > 0 ?
             GL_STENCIL_INDEX8 : 0;
       }
     } else {
-      offscreen_target_color_format_ = attrib_parser.alpha_size > 0 ?
-          GL_RGBA : GL_RGB;
+      offscreen_target_color_format_ =
+          attrib_parser.alpha_size > 0 || workarounds().disable_gl_rgb_format
+              ? GL_RGBA
+              : GL_RGB;
 
       // If depth is requested at all, use the packed depth stencil format if
       // it's available, as some desktop GL drivers don't support any non-packed
       // formats for depth attachments.
       const bool depth24_stencil8_supported =
           feature_info_->feature_flags().packed_depth24_stencil8;
       VLOG(1) << "GL_EXT_packed_depth_stencil "
               << (depth24_stencil8_supported ? "" : "not ") << "supported.";
 
       if ((attrib_parser.depth_size > 0 || attrib_parser.stencil_size > 0) &&
           depth24_stencil8_supported) {
         offscreen_target_depth_format_ = GL_DEPTH24_STENCIL8;
         offscreen_target_stencil_format_ = 0;
       } else {
         offscreen_target_depth_format_ = attrib_parser.depth_size > 0 ?
             GL_DEPTH_COMPONENT : 0;
         offscreen_target_stencil_format_ = attrib_parser.stencil_size > 0 ?
             GL_STENCIL_INDEX : 0;
       }
     }
 
-    offscreen_saved_color_format_ = attrib_parser.alpha_size > 0 ?
-        GL_RGBA : GL_RGB;
+    offscreen_saved_color_format_ =
+        attrib_parser.alpha_size > 0 || workarounds().disable_gl_rgb_format
+            ? GL_RGBA
+            : GL_RGB;
 
     // Create the target frame buffer. This is the one that the client renders
     // directly to.
     offscreen_target_frame_buffer_.reset(new BackFramebuffer(this));
     offscreen_target_frame_buffer_->Create();
     // Due to GLES2 format limitations, either the color texture (for
     // non-multisampling) or the color render buffer (for multisampling) will be
     // attached to the offscreen frame buffer.  The render buffer has more
     // limited formats available to it, but the texture can't do multisampling.
     if (IsOffscreenBufferMultisampled()) {
@@ skipping 10055 matching lines @@
   }
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu