dom/canvas/WebGL2Context.cpp

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "WebGL2Context.h"
   7
   8 #include "mozilla/StaticPrefs_webgl.h"
   9 #include "GLContext.h"
  10 #include "mozilla/dom/WebGL2RenderingContextBinding.h"
  11 #include "mozilla/ArrayUtils.h"
  12 #include "mozilla/Telemetry.h"
  13 #include "nsPrintfCString.h"
  14 #include "WebGLBuffer.h"
  15 #include "WebGLFormats.h"
  16 #include "WebGLTransformFeedback.h"
  17
  18 namespace mozilla {
  19
  20 UniquePtr<webgl::FormatUsageAuthority> WebGL2Context::CreateFormatUsage(
  21     gl::GLContext* gl) const {
  22   return webgl::FormatUsageAuthority::CreateForWebGL2(gl);
  23 }
  24
  25 ////////////////////////////////////////////////////////////////////////////////
  26 // WebGL 2 initialisation
  27
  28 static const gl::GLFeature kRequiredFeatures[] = {
  29     gl::GLFeature::blend_minmax,
  30     gl::GLFeature::clear_buffers,
  31     gl::GLFeature::copy_buffer,
  32     gl::GLFeature::depth_texture,
  33     gl::GLFeature::draw_instanced,
  34     gl::GLFeature::element_index_uint,
  35     gl::GLFeature::frag_color_float,
  36     gl::GLFeature::frag_depth,
  37     gl::GLFeature::framebuffer_object,
  38     gl::GLFeature::get_integer_indexed,
  39     gl::GLFeature::get_integer64_indexed,
  40     gl::GLFeature::gpu_shader4,
  41     gl::GLFeature::instanced_arrays,
  42     gl::GLFeature::instanced_non_arrays,
  43     gl::GLFeature::map_buffer_range,  // Used by GetBufferSubData.
  44     gl::GLFeature::occlusion_query2,
  45     gl::GLFeature::packed_depth_stencil,
  46     gl::GLFeature::query_objects,
  47     gl::GLFeature::sRGB,
  48     gl::GLFeature::sampler_objects,
  49     gl::GLFeature::standard_derivatives,
  50     gl::GLFeature::texture_3D,
  51     gl::GLFeature::texture_3D_compressed,
  52     gl::GLFeature::texture_3D_copy,
  53     gl::GLFeature::texture_float,
  54     gl::GLFeature::texture_half_float,
  55     gl::GLFeature::texture_half_float_linear,
  56     gl::GLFeature::texture_non_power_of_two,
  57     gl::GLFeature::texture_storage,
  58     gl::GLFeature::transform_feedback2,
  59     gl::GLFeature::uniform_buffer_object,
  60     gl::GLFeature::uniform_matrix_nonsquare,
  61     gl::GLFeature::vertex_array_object};
  62
  63 bool WebGLContext::InitWebGL2(FailureReason* const out_failReason) {
  64   MOZ_ASSERT(IsWebGL2(), "WebGLContext is not a WebGL 2 context!");
  65
  66   std::vector<gl::GLFeature> missingList;
  67
  68   const auto fnGatherMissing = [&](gl::GLFeature cur) {
  69     if (!gl->IsSupported(cur)) {
  70       missingList.push_back(cur);
  71     }
  72   };
  73
  74   const auto fnGatherMissing2 = [&](gl::GLFeature main, gl::GLFeature alt) {
  75     if (!gl->IsSupported(main) && !gl->IsSupported(alt)) {
  76       missingList.push_back(main);
  77     }
  78   };
  79
  80   ////
  81
  82   for (const auto& cur : kRequiredFeatures) {
  83     fnGatherMissing(cur);
  84   }
  85
  86   // On desktop, we fake occlusion_query_boolean with occlusion_query if
  87   // necessary. (See WebGL2ContextQueries.cpp)
  88   fnGatherMissing2(gl::GLFeature::occlusion_query_boolean,
  89                    gl::GLFeature::occlusion_query);
  90
  91 #ifdef XP_MACOSX
  92   // On OSX, GL core profile is used. This requires texture swizzle
  93   // support to emulate legacy texture formats: ALPHA, LUMINANCE,
  94   // and LUMINANCE_ALPHA.
  95   fnGatherMissing(gl::GLFeature::texture_swizzle);
  96 #endif
  97
  98   fnGatherMissing2(gl::GLFeature::prim_restart_fixed,
  99                    gl::GLFeature::prim_restart);
 100
 101   ////
 102
 103   if (!missingList.empty()) {
 104     nsAutoCString exts;
 105     for (auto itr = missingList.begin(); itr != missingList.end(); ++itr) {
 106       exts.AppendLiteral("\n  ");
 107       exts.Append(gl::GLContext::GetFeatureName(*itr));
 108     }
 109
 110     const nsPrintfCString reason(
 111         "WebGL 2 requires support for the following"
 112         " features: %s",
 113         exts.BeginReading());
 114     *out_failReason = FailureReason("FEATURE_FAILURE_WEBGL2_OCCL", reason);
 115     return false;
 116   }
 117
 118   mGLMinProgramTexelOffset =
 119       gl->GetIntAs<uint32_t>(LOCAL_GL_MIN_PROGRAM_TEXEL_OFFSET);
 120   mGLMaxProgramTexelOffset =
 121       gl->GetIntAs<uint32_t>(LOCAL_GL_MAX_PROGRAM_TEXEL_OFFSET);
 122
 123   mIndexedUniformBufferBindings.resize(mLimits->maxUniformBufferBindings);
 124
 125   mDefaultTransformFeedback = new WebGLTransformFeedback(this, 0);
 126   mBoundTransformFeedback = mDefaultTransformFeedback;
 127
 128   gl->fGenTransformFeedbacks(1, &mEmptyTFO);
 129
 130   ////
 131
 132   if (!gl->IsGLES()) {
 133     // Desktop OpenGL requires the following to be enabled in order to
 134     // support sRGB operations on framebuffers.
 135     gl->fEnable(LOCAL_GL_FRAMEBUFFER_SRGB_EXT);
 136   }
 137
 138   if (gl->IsSupported(gl::GLFeature::prim_restart_fixed)) {
 139     gl->fEnable(LOCAL_GL_PRIMITIVE_RESTART_FIXED_INDEX);
 140   } else {
 141     MOZ_ASSERT(gl->IsSupported(gl::GLFeature::prim_restart));
 142   }
 143
 144   //////
 145
 146   return true;
 147 }
 148
 149 // -
 150
 151 /*virtual*/
 152 bool WebGL2Context::IsTexParamValid(GLenum pname) const {
 153   switch (pname) {
 154     case LOCAL_GL_TEXTURE_BASE_LEVEL:
 155     case LOCAL_GL_TEXTURE_COMPARE_FUNC:
 156     case LOCAL_GL_TEXTURE_COMPARE_MODE:
 157     case LOCAL_GL_TEXTURE_IMMUTABLE_FORMAT:
 158     case LOCAL_GL_TEXTURE_IMMUTABLE_LEVELS:
 159     case LOCAL_GL_TEXTURE_MAX_LEVEL:
 160     case LOCAL_GL_TEXTURE_WRAP_R:
 161     case LOCAL_GL_TEXTURE_MAX_LOD:
 162     case LOCAL_GL_TEXTURE_MIN_LOD:
 163       return true;
 164
 165     default:
 166       return WebGLContext::IsTexParamValid(pname);
 167   }
 168 }
 169
 170 }  // namespace mozilla