Get ReadPixels to work with INT and UNSIGNED_INT format.

gpu/command_buffer/common/gles2_cmd_utils.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.
 
 // This file is here so other GLES2 related files can have a common set of
 // includes where appropriate.
 
 #include <sstream>
 #include <GLES2/gl2.h>
 #include <GLES2/gl2ext.h>
@@ skipping 435 matching lines @@
 }
 
 // Return the number of bytes per element, based on the element type.
 int BytesPerElement(int type) {
   switch (type) {
     case GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
       return 8;
     case GL_FLOAT:
     case GL_UNSIGNED_INT_24_8_OES:
     case GL_UNSIGNED_INT:
+    case GL_INT:
     case GL_UNSIGNED_INT_2_10_10_10_REV:
     case GL_UNSIGNED_INT_10F_11F_11F_REV:
     case GL_UNSIGNED_INT_5_9_9_9_REV:
       return 4;
     case GL_HALF_FLOAT:
     case GL_HALF_FLOAT_OES:
     case GL_UNSIGNED_SHORT:
     case GL_SHORT:
     case GL_UNSIGNED_SHORT_5_6_5:
     case GL_UNSIGNED_SHORT_4_4_4_4:
@@ skipping 612 matching lines @@
       return GL_PIXEL_UNPACK_BUFFER_BINDING;
     case GL_TRANSFORM_FEEDBACK_BUFFER:
       return GL_TRANSFORM_FEEDBACK_BUFFER_BINDING;
     case GL_UNIFORM_BUFFER:
       return GL_UNIFORM_BUFFER_BINDING;
     default:
       return 0;
   }
 }
 
+// static
+bool GLES2Util::IsUnsignedIntegerFormat(uint32_t internal_format) {
+  switch (internal_format) {
+    case GL_R8UI:
+    case GL_R16UI:
+    case GL_R32UI:
+    case GL_RG8UI:
+    case GL_RG16UI:
+    case GL_RG32UI:
+    case GL_RGBA8UI:
+    case GL_RGB10_A2UI:
+    case GL_RGBA16UI:
+    case GL_RGBA32UI:
+      return true;
+    default:
+      return false;
+  }
+}
+
+// static
+bool GLES2Util::IsSignedIntegerFormat(uint32_t internal_format) {
+  switch (internal_format) {
+    case GL_R8I:
+    case GL_R16I:
+    case GL_R32I:
+    case GL_RG8I:
+    case GL_RG16I:
+    case GL_RG32I:
+    case GL_RGBA8I:
+    case GL_RGBA16I:
+    case GL_RGBA32I:
+      return true;
+    default:
+      return false;
+  }
+}
+
+// static
+bool GLES2Util::IsIntegerFormat(uint32_t internal_format) {
+  return (IsUnsignedIntegerFormat(internal_format) ||
+          IsSignedIntegerFormat(internal_format));
+}
+
 
 namespace {
 
 // WebGraphicsContext3DCommandBufferImpl configuration attributes. Those in
 // the 16-bit range are the same as used by EGL. Those outside the 16-bit range
 // are unique to Chromium. Attributes are matched using a closest fit algorithm.
 
 // From <EGL/egl.h>.
 const int32 kAlphaSize       = 0x3021;  // EGL_ALPHA_SIZE
 const int32 kBlueSize        = 0x3022;  // EGL_BLUE_SIZE
@@ skipping 142 matching lines @@
   }
 
   return true;
 }
 
 #include "gpu/command_buffer/common/gles2_cmd_utils_implementation_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu