Add half-float IOSurface GpuMemoryBuffer support

gpu/command_buffer/common/gpu_memory_buffer_support.cc

Index: gpu/command_buffer/common/gpu_memory_buffer_support.cc
diff --git a/gpu/command_buffer/common/gpu_memory_buffer_support.cc b/gpu/command_buffer/common/gpu_memory_buffer_support.cc
index 68237a08fd255e6ffc020f530493d662ffad0290..b6d10c2a25e23d7bd97837ee1a7a4214173a19e4 100644
--- a/gpu/command_buffer/common/gpu_memory_buffer_support.cc
+++ b/gpu/command_buffer/common/gpu_memory_buffer_support.cc
@@ -84,6 +84,7 @@ bool IsImageFormatCompatibleWithGpuMemoryBufferFormat(
     case gfx::BufferFormat::RGBX_8888:
       return internalformat == GL_RGB;
     case gfx::BufferFormat::RGBA_4444:
+    case gfx::BufferFormat::RGBA_F16:
       return internalformat == GL_RGBA;
   }
 
@@ -117,6 +118,8 @@ bool IsGpuMemoryBufferFormatSupported(gfx::BufferFormat format,
     case gfx::BufferFormat::RGBX_8888:
     case gfx::BufferFormat::YVU_420:
       return true;
+    case gfx::BufferFormat::RGBA_F16:
+      return capabilities.texture_half_float_linear;

[reveman, 2017/03/31 09:13:55]

This looks fine but we should probably rename this function in a separate patch
to not have it confused with GMB support. The function answers the question; is
GMB backed GLImage support for the given format supported given a set of GLES
decode capabilities. Maybe "IsImageForGpuMemoryBufferFormatSupported".

[ccameron, 2017/04/11 07:45:11]

Thanks for the clarification -- I've gone ahead and updated the name in this
patch.

     case gfx::BufferFormat::YUV_420_BIPLANAR:
 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARM_FAMILY)
       // TODO(dcastagna): Determine ycbcr_420v_image on CrOS at runtime
@@ -150,6 +153,7 @@ bool IsImageSizeValidForGpuMemoryBufferFormat(const gfx::Size& size,
     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: