gpu: support R16 GPUMemoryBuffer

gpu/command_buffer/common/gpu_memory_buffer_support.cc

 // Copyright 2016 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/common/gpu_memory_buffer_support.h"
 
 #include <GLES2/gl2.h>
 #include <GLES2/gl2extchromium.h>
 
 #include "base/logging.h"
 #include "gpu/command_buffer/common/capabilities.h"
 
 namespace gpu {
 
 namespace {
 
 gfx::BufferFormat BufferFormatForInternalFormat(unsigned internalformat) {
   switch (internalformat) {
     case GL_RED_EXT:
       return gfx::BufferFormat::R_8;
+    case GL_R16_EXT:
+      return gfx::BufferFormat::R_16;
     case GL_RG_EXT:
       return gfx::BufferFormat::RG_88;
     case GL_RGB:
       return gfx::BufferFormat::BGRX_8888;
     case GL_RGBA:
       return gfx::BufferFormat::RGBA_8888;
     case GL_BGRA_EXT:
       return gfx::BufferFormat::BGRA_8888;
     case GL_ATC_RGB_AMD:
       return gfx::BufferFormat::ATC;
@@ skipping 24 matching lines @@
     gfx::BufferFormat format) {
   switch (format) {
     case gfx::BufferFormat::ATC:
     case gfx::BufferFormat::ATCIA:
     case gfx::BufferFormat::BGRA_8888:
     case gfx::BufferFormat::BGRX_8888:
     case gfx::BufferFormat::DXT1:
     case gfx::BufferFormat::DXT5:
     case gfx::BufferFormat::ETC1:
     case gfx::BufferFormat::R_8:
+    case gfx::BufferFormat::R_16:
     case gfx::BufferFormat::RG_88:
     case gfx::BufferFormat::RGBA_8888:
     case gfx::BufferFormat::YVU_420:
     case gfx::BufferFormat::YUV_420_BIPLANAR:
     case gfx::BufferFormat::UYVY_422:
       return format == BufferFormatForInternalFormat(internalformat);
     case gfx::BufferFormat::BGR_565:
     case gfx::BufferFormat::RGBX_8888:
       return internalformat == GL_RGB;
     case gfx::BufferFormat::RGBA_4444:
@@ skipping 14 matching lines @@
       return capabilities.texture_format_atc;
     case gfx::BufferFormat::BGRA_8888:
     case gfx::BufferFormat::BGRX_8888:
       return capabilities.texture_format_bgra8888;
     case gfx::BufferFormat::DXT1:
       return capabilities.texture_format_dxt1;
     case gfx::BufferFormat::DXT5:
       return capabilities.texture_format_dxt5;
     case gfx::BufferFormat::ETC1:
       return capabilities.texture_format_etc1;
+    case gfx::BufferFormat::R_16:
+      return capabilities.texture_norm16;
     case gfx::BufferFormat::R_8:
     case gfx::BufferFormat::RG_88:
       return capabilities.texture_rg;
     case gfx::BufferFormat::UYVY_422:
       return capabilities.image_ycbcr_422;
     case gfx::BufferFormat::BGR_565:
     case gfx::BufferFormat::RGBA_4444:
     case gfx::BufferFormat::RGBA_8888:
     case gfx::BufferFormat::RGBX_8888:
     case gfx::BufferFormat::YVU_420:
@@ skipping 19 matching lines @@
   switch (format) {
     case gfx::BufferFormat::ATC:
     case gfx::BufferFormat::ATCIA:
     case gfx::BufferFormat::DXT1:
     case gfx::BufferFormat::DXT5:
     case gfx::BufferFormat::ETC1:
       // Compressed images must have a width and height that's evenly divisible
       // by the block size.
       return size.width() % 4 == 0 && size.height() % 4 == 0;
     case gfx::BufferFormat::R_8:
+    case gfx::BufferFormat::R_16:
     case gfx::BufferFormat::RG_88:
     case gfx::BufferFormat::BGR_565:
     case gfx::BufferFormat::RGBA_4444:
     case gfx::BufferFormat::RGBA_8888:
     case gfx::BufferFormat::RGBX_8888:
     case gfx::BufferFormat::BGRA_8888:
     case gfx::BufferFormat::BGRX_8888:
     case gfx::BufferFormat::RGBA_F16:
       return true;
     case gfx::BufferFormat::YVU_420:
     case gfx::BufferFormat::YUV_420_BIPLANAR:
       // U and V planes are subsampled by a factor of 2.
       return size.width() % 2 == 0 && size.height() % 2 == 0;
     case gfx::BufferFormat::UYVY_422:
       return size.width() % 2 == 0;
   }
 
   NOTREACHED();
   return false;
 }
 
 }  // namespace gpu