dom/canvas/WebGLExtensionCompressedTextureES3.cpp

   1 /* This Source Code Form is subject to the terms of the Mozilla Public
   2  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
   3  * You can obtain one at http://mozilla.org/MPL/2.0/. */
   4
   5 #include "WebGLExtensions.h"
   6
   7 #include "GLContext.h"
   8 #include "mozilla/dom/WebGLRenderingContextBinding.h"
   9 #include "WebGLContext.h"
  10 #include "WebGLFormats.h"
  11
  12 namespace mozilla {
  13
  14 WebGLExtensionCompressedTextureES3::WebGLExtensionCompressedTextureES3(
  15     WebGLContext* webgl)
  16     : WebGLExtensionBase(webgl) {
  17   // GLES 3.0.4, p147, table 3.19
  18   // GLES 3.0.4, p286+, $C.1 "ETC Compressed Texture Image Formats"
  19   // Note that all compressed texture formats are filterable:
  20   // GLES 3.0.4 p161:
  21   // "[A] texture is complete unless any of the following conditions hold true:
  22   //  [...]
  23   //  * The effective internal format specified for the texture arrays is a
  24   //    sized internal color format that is not texture-filterable (see table
  25   //    3.13) and [the mag filter requires filtering]."
  26   // Compressed formats are not sized internal color formats, and indeed they
  27   // are not listed in table 3.13.
  28
  29   RefPtr<WebGLContext> webgl_ = webgl;  // Bug 1201275
  30   const auto fnAdd = [&webgl_](GLenum sizedFormat,
  31                                webgl::EffectiveFormat effFormat) {
  32     auto& fua = webgl_->mFormatUsage;
  33
  34     auto usage = fua->EditUsage(effFormat);
  35     usage->isFilterable = true;
  36     fua->AllowSizedTexFormat(sizedFormat, usage);
  37   };
  38
  39 #define FOO(x) LOCAL_GL_##x, webgl::EffectiveFormat::x
  40
  41   fnAdd(FOO(COMPRESSED_R11_EAC));
  42   fnAdd(FOO(COMPRESSED_SIGNED_R11_EAC));
  43   fnAdd(FOO(COMPRESSED_RG11_EAC));
  44   fnAdd(FOO(COMPRESSED_SIGNED_RG11_EAC));
  45   fnAdd(FOO(COMPRESSED_RGB8_ETC2));
  46   fnAdd(FOO(COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2));
  47   fnAdd(FOO(COMPRESSED_RGBA8_ETC2_EAC));
  48
  49   // sRGB support is manadatory in GL 4.3 and GL ES 3.0, which are the only
  50   // versions to support ETC2.
  51   fnAdd(FOO(COMPRESSED_SRGB8_ALPHA8_ETC2_EAC));
  52   fnAdd(FOO(COMPRESSED_SRGB8_ETC2));
  53   fnAdd(FOO(COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2));
  54
  55 #undef FOO
  56 }
  57
  58 }  // namespace mozilla