WebGL: tex(Sub)Image(2D|3D) texImageSource support for RGB10_A2 textures.

third_party/WebKit/Source/platform/graphics/gpu/WebGLImageConversion.cpp

Index: third_party/WebKit/Source/platform/graphics/gpu/WebGLImageConversion.cpp
diff --git a/third_party/WebKit/Source/platform/graphics/gpu/WebGLImageConversion.cpp b/third_party/WebKit/Source/platform/graphics/gpu/WebGLImageConversion.cpp
index 48d109cf2fcb93745b9074e44e594fa9cc739ba9..eb983aae54ece40f4e73f2b4df320a44c69eb6d7 100644
--- a/third_party/WebKit/Source/platform/graphics/gpu/WebGLImageConversion.cpp
+++ b/third_party/WebKit/Source/platform/graphics/gpu/WebGLImageConversion.cpp
@@ -1618,6 +1618,24 @@ void Pack<WebGLImageConversion::kDataFormatRGBA32_S,
 
 template <>
 void Pack<WebGLImageConversion::kDataFormatRGBA2_10_10_10,
+          WebGLImageConversion::kAlphaDoNothing,
+          float,
+          uint32_t>(const float* source,
+                    uint32_t* destination,
+                    unsigned pixels_per_row) {
+  for (unsigned i = 0; i < pixels_per_row; ++i) {
+    uint32_t r = static_cast<uint32_t>(source[0] * 1023.0f);
+    uint32_t g = static_cast<uint32_t>(source[1] * 1023.0f);
+    uint32_t b = static_cast<uint32_t>(source[2] * 1023.0f);
+    uint32_t a = static_cast<uint32_t>(source[3] * 3.0f);
+    destination[0] = (a << 30) | (b << 20) | (g << 10) | r;
+    source += 4;
+    destination += 1;
+  }
+}
+
+template <>
+void Pack<WebGLImageConversion::kDataFormatRGBA2_10_10_10,
           WebGLImageConversion::kAlphaDoPremultiply,
           float,
           uint32_t>(const float* source,
@@ -1635,6 +1653,25 @@ void Pack<WebGLImageConversion::kDataFormatRGBA2_10_10_10,
 }
 
 template <>
+void Pack<WebGLImageConversion::kDataFormatRGBA2_10_10_10,
+          WebGLImageConversion::kAlphaDoUnmultiply,
+          float,
+          uint32_t>(const float* source,
+                    uint32_t* destination,
+                    unsigned pixels_per_row) {
+  for (unsigned i = 0; i < pixels_per_row; ++i) {
+    float scale_factor = source[3] ? 1023.0f / source[3] : 1023.0f;
+    uint32_t r = static_cast<uint32_t>(source[0] * scale_factor);
+    uint32_t g = static_cast<uint32_t>(source[1] * scale_factor);
+    uint32_t b = static_cast<uint32_t>(source[2] * scale_factor);
+    uint32_t a = static_cast<uint32_t>(source[3] * 3.0f);
+    destination[0] = (a << 30) | (b << 20) | (g << 10) | r;
+    source += 4;
+    destination += 1;
+  }
+}
+
+template <>
 void Pack<WebGLImageConversion::kDataFormatRG8,
           WebGLImageConversion::kAlphaDoNothing,
           uint8_t,
@@ -2405,7 +2442,8 @@ struct SupportsConversionFromDomElements {
       Format == WebGLImageConversion::kDataFormatR16F ||
       Format == WebGLImageConversion::kDataFormatRGBA5551 ||
       Format == WebGLImageConversion::kDataFormatRGBA4444 ||
-      Format == WebGLImageConversion::kDataFormatRGB565;
+      Format == WebGLImageConversion::kDataFormatRGB565 ||
+      Format == WebGLImageConversion::kDataFormatRGBA2_10_10_10;
 };
 
 template <WebGLImageConversion::DataFormat SrcFormat,