viz: Add RG_16 resource format

This is needed for importing the UV plane of a P010/P016 texture into
GL/ANGLE.

Bug: 1116101
Change-Id: I32a008ddc0350858372d764de14998c930d48683
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626100
Auto-Submit: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843532}

cc/raster/raster_buffer_provider.cc

@@ -38,6 +38,7 @@ bool IsSupportedPlaybackToMemoryFormat(viz::ResourceFormat format) {
     case viz::RED_8:
     case viz::LUMINANCE_F16:
     case viz::R16_EXT:
+    case viz::RG16_EXT:
     case viz::BGR_565:
     case viz::RG_88:
     case viz::RGBX_8888:
@@ -137,6 +138,7 @@ void RasterBufferProvider::PlaybackToMemory(
     case viz::RED_8:
     case viz::LUMINANCE_F16:
     case viz::R16_EXT:
+    case viz::RG16_EXT:
     case viz::BGR_565:
     case viz::RG_88:
     case viz::RGBX_8888:

components/viz/common/resources/resource_format.h

@@ -23,6 +23,7 @@ enum ResourceFormat {
   LUMINANCE_F16,
   RGBA_F16,
   R16_EXT,
+  RG16_EXT,
   RGBX_8888,
   BGRX_8888,
   RGBA_1010102,

components/viz/common/resources/resource_format_utils.cc

@@ -58,6 +58,7 @@ SkColorType ResourceFormatToClosestSkColorType(bool gpu_compositing,
       return kGray_8_SkColorType;
     case LUMINANCE_F16:
     case R16_EXT:
+    case RG16_EXT:
     case BGR_565:
       return kN32_SkColorType;
     case RG_88:
@@ -82,6 +83,7 @@ int BitsPerPixel(ResourceFormat format) {
     case RGBA_1010102:
     case BGRA_1010102:
     case P010:
+    case RG16_EXT:
       return 32;
     case RGBA_4444:
     case RGB_565:
@@ -120,6 +122,7 @@ bool HasAlpha(ResourceFormat format) {
     case RG_88:
     case LUMINANCE_F16:
     case R16_EXT:
+    case RG16_EXT:
     case RGBX_8888:
     case BGRX_8888:
     case RGBA_1010102:
@@ -149,6 +152,7 @@ unsigned int GLDataType(ResourceFormat format) {
       GL_HALF_FLOAT_OES,                   // LUMINANCE_F16
       GL_HALF_FLOAT_OES,                   // RGBA_F16
       GL_UNSIGNED_SHORT,                   // R16_EXT
+      GL_UNSIGNED_SHORT,                   // RG16_EXT
       GL_UNSIGNED_BYTE,                    // RGBX_8888
       GL_ZERO,                             // BGRX_8888
       GL_UNSIGNED_INT_2_10_10_10_REV_EXT,  // RGBA_1010102
@@ -179,6 +183,7 @@ unsigned int GLDataFormat(ResourceFormat format) {
       GL_LUMINANCE,  // LUMINANCE_F16
       GL_RGBA,       // RGBA_F16
       GL_RED_EXT,    // R16_EXT
+      GL_RG_EXT,     // RG16_EXT
       GL_RGB,        // RGBX_8888
       GL_ZERO,       // BGRX_8888
       GL_RGBA,       // RGBA_1010102
@@ -198,16 +203,21 @@ unsigned int GLInternalFormat(ResourceFormat format) {
   // is true in GLES3, however it still holds for the BGRA extension.)
   // GL_EXT_texture_norm16 follows GLES3 semantics and only exposes a sized
   // internal format (GL_R16_EXT).
-  if (format == R16_EXT)
-    return GL_R16_EXT;
-  else if (format == RG_88)
-    return GL_RG8_EXT;
-  else if (format == ETC1)
-    return GL_ETC1_RGB8_OES;
-  else if (format == RGBA_1010102 || format == BGRA_1010102)
-    return GL_RGB10_A2_EXT;
-
-  return GLDataFormat(format);
+  switch (format) {
+    case R16_EXT:
+      return GL_R16_EXT;
+    case RG_88:
+      return GL_RG8_EXT;
+    case RG16_EXT:
+      return GL_RG16_EXT;
+    case ETC1:
+      return GL_ETC1_RGB8_OES;
+    case RGBA_1010102:
+    case BGRA_1010102:
+      return GL_RGB10_A2_EXT;
+    default:
+      return GLDataFormat(format);
+  }
 }
 
 unsigned int GLCopyTextureInternalFormat(ResourceFormat format) {
@@ -232,6 +242,7 @@ unsigned int GLCopyTextureInternalFormat(ResourceFormat format) {
       GL_LUMINANCE,  // LUMINANCE_F16
       GL_RGBA,       // RGBA_F16
       GL_LUMINANCE,  // R16_EXT
+      GL_RGBA,       // RG16_EXT
       GL_RGB,        // RGBX_8888
       GL_RGB,        // BGRX_8888
       GL_ZERO,       // RGBA_1010102
@@ -284,6 +295,7 @@ gfx::BufferFormat BufferFormat(ResourceFormat format) {
     case LUMINANCE_8:
     case RGB_565:
     case LUMINANCE_F16:
+    case RG16_EXT:
       // These types not allowed by IsGpuMemoryBufferFormatSupported(), so
       // give a default value that will not be used.
       break;
@@ -319,6 +331,8 @@ unsigned int TextureStorageFormat(ResourceFormat format) {
       return GL_LUMINANCE16F_EXT;
     case R16_EXT:
       return GL_R16_EXT;
+    case RG16_EXT:
+      return GL_RG16_EXT;
     case RGBX_8888:
     case ETC1:
       return GL_RGB8_OES;
@@ -342,6 +356,7 @@ bool IsGpuMemoryBufferFormatSupported(ResourceFormat format) {
     case BGRA_8888:
     case RED_8:
     case R16_EXT:
+    case RG16_EXT:
     case RGBA_4444:
     case RGBA_8888:
     case RGBA_1010102:
@@ -382,6 +397,7 @@ bool IsBitmapFormatSupported(ResourceFormat format) {
     case LUMINANCE_F16:
     case RGBA_F16:
     case R16_EXT:
+    case RG16_EXT:
     case BGR_565:
     case RG_88:
     case RGBX_8888:
@@ -459,6 +475,7 @@ bool HasVkFormat(ResourceFormat format) {
     case RG_88:
     case RGBA_F16:
     case R16_EXT:
+    case RG16_EXT:
     case RGBX_8888:
     case BGRX_8888:
     case RGBA_1010102:
@@ -494,6 +511,8 @@ VkFormat ToVkFormat(ResourceFormat format) {
       return VK_FORMAT_R16G16B16A16_SFLOAT;
     case R16_EXT:
       return VK_FORMAT_R16_UNORM;
+    case RG16_EXT:
+      return VK_FORMAT_R16G16_UNORM;
     case RGBX_8888:
       return VK_FORMAT_R8G8B8A8_UNORM;
     case BGRX_8888:
@@ -543,6 +562,7 @@ wgpu::TextureFormat ToDawnFormat(ResourceFormat format) {
     case RGB_565:
     case BGR_565:
     case R16_EXT:
+    case RG16_EXT:
     case BGRA_1010102:
     case YVU_420:
     case YUV_420_BIPLANAR:

gpu/command_buffer/service/external_vk_image_backing.cc

@@ -70,6 +70,7 @@ static const struct {
     {GL_RED, GL_HALF_FLOAT_OES, 2},                // LUMINANCE_F16
     {GL_RGBA, GL_HALF_FLOAT_OES, 8},               // RGBA_F16
     {GL_RED, GL_UNSIGNED_SHORT, 2},                // R16_EXT
+    {GL_RG, GL_UNSIGNED_SHORT, 4},                 // RG16_EXT
     {GL_RGBA, GL_UNSIGNED_BYTE, 4},                // RGBX_8888
     {GL_BGRA, GL_UNSIGNED_BYTE, 4},                // BGRX_8888
     {GL_RGBA, GL_UNSIGNED_INT_2_10_10_10_REV, 4},  // RGBA_1010102

ui/gl/gl_image.cc

@@ -29,7 +29,9 @@ unsigned GLImage::GetDataFormat() {
   unsigned internalformat = GetInternalFormat();
   switch (internalformat) {
     case GL_R16_EXT:
-      return GL_RED;
+      return GL_RED_EXT;
+    case GL_RG16_EXT:
+      return GL_RG_EXT;
     case GL_RGB10_A2_EXT:
       return GL_RGBA;
     case GL_RGB_YCRCB_420_CHROMIUM: