16 bpp video stream capture, render and WebGL usage - Realsense R200 & SR300 support.

gpu/command_buffer/service/gles2_cmd_copy_texture_chromium.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_copy_texture_chromium.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 401 matching lines @@
     bool unpremultiply_alpha) {
   bool premultiply_alpha_change = premultiply_alpha ^ unpremultiply_alpha;
   // GL_INVALID_OPERATION is generated if the currently bound framebuffer's
   // format does not contain a superset of the components required by the base
   // format of internalformat.
   // https://www.khronos.org/opengles/sdk/docs/man/xhtml/glCopyTexImage2D.xml
   bool source_format_contain_superset_of_dest_format =
       (source_internal_format == dest_internal_format &&
        source_internal_format != GL_BGRA_EXT) ||
       (source_internal_format == GL_RGBA && dest_internal_format == GL_RGB);
+  if (!source_format_contain_superset_of_dest_format) {
+    using GL = gles2::GLES2Util;
+    uint32_t source_channels = GL::GetChannelsForFormat(source_internal_format);
+    uint32_t dest_channels = GL::GetChannelsForFormat(dest_internal_format);
+    const gles2::FeatureInfo* info = decoder->GetFeatureInfo();
+    source_format_contain_superset_of_dest_format =
+        (GL::IsIntegerFormat(dest_internal_format) ==
+         GL::IsIntegerFormat(source_internal_format)) &&
+        (source_channels == dest_channels) &&
+        (((dest_channels == GL::kRed || dest_channels == GL::kAlpha ||
+           dest_channels == (GL::kRed | GL::kGreen)) &&
+          info->IsES3Capable()) ||
+         (dest_channels == GL::kRed && info->feature_flags().ext_texture_rg &&
+          !GL::IsIntegerFormat(dest_internal_format)));

[Ken Russell (switch to Gerrit), 2016/09/30 23:01:29]

This addition to the code is very highly specialized to your use case. Can you
simplify and generalize it, and still keep it working for your uses?

[aleksandar.stojiljkovic, 2016/10/03 10:56:52]

Done. This would be useful later - edited out from this patch as not WebGL1
related.

+  }
   // GL_TEXTURE_RECTANGLE_ARB on FBO is supported by OpenGL, not GLES2,
   // so restrict this to GL_TEXTURE_2D.
   if (source_target == GL_TEXTURE_2D && dest_target == GL_TEXTURE_2D &&
       !flip_y && !premultiply_alpha_change &&
       source_format_contain_superset_of_dest_format) {
     DoCopyTexImage2D(decoder,
                      source_target,
                      source_id,
                      dest_target,
                      dest_id,
@@ skipping 320 matching lines @@
   decoder->RestoreTextureState(dest_id);
   decoder->RestoreTextureUnitBindings(0);
   decoder->RestoreActiveTexture();
   decoder->RestoreProgramBindings();
   decoder->RestoreBufferBindings();
   decoder->RestoreFramebufferBindings();
   decoder->RestoreGlobalState();
 }
 
 }  // namespace gpu