1 files changed, 170 insertions, 0 deletions
diff --git a/dom/canvas/WebGL2Context.cpp b/dom/canvas/WebGL2Context.cpp
new file mode 100644
index 0000000000..5168f20162
--- /dev/null
+++ b/dom/canvas/WebGL2Context.cpp
@@ -0,0 +1,170 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WebGL2Context.h"
+
+#include "mozilla/StaticPrefs_webgl.h"
+#include "GLContext.h"
+#include "mozilla/dom/WebGL2RenderingContextBinding.h"
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/Telemetry.h"
+#include "nsPrintfCString.h"
+#include "WebGLBuffer.h"
+#include "WebGLFormats.h"
+#include "WebGLTransformFeedback.h"
+
+namespace mozilla {
+
+UniquePtr<webgl::FormatUsageAuthority> WebGL2Context::CreateFormatUsage(
+    gl::GLContext* gl) const {
+  return webgl::FormatUsageAuthority::CreateForWebGL2(gl);
+}
+
+////////////////////////////////////////////////////////////////////////////////
+// WebGL 2 initialisation
+
+static const gl::GLFeature kRequiredFeatures[] = {
+    gl::GLFeature::blend_minmax,
+    gl::GLFeature::clear_buffers,
+    gl::GLFeature::copy_buffer,
+    gl::GLFeature::depth_texture,
+    gl::GLFeature::draw_instanced,
+    gl::GLFeature::element_index_uint,
+    gl::GLFeature::frag_color_float,
+    gl::GLFeature::frag_depth,
+    gl::GLFeature::framebuffer_object,
+    gl::GLFeature::get_integer_indexed,
+    gl::GLFeature::get_integer64_indexed,
+    gl::GLFeature::gpu_shader4,
+    gl::GLFeature::instanced_arrays,
+    gl::GLFeature::instanced_non_arrays,
+    gl::GLFeature::map_buffer_range,  // Used by GetBufferSubData.
+    gl::GLFeature::occlusion_query2,
+    gl::GLFeature::packed_depth_stencil,
+    gl::GLFeature::query_objects,
+    gl::GLFeature::sRGB,
+    gl::GLFeature::sampler_objects,
+    gl::GLFeature::standard_derivatives,
+    gl::GLFeature::texture_3D,
+    gl::GLFeature::texture_3D_compressed,
+    gl::GLFeature::texture_3D_copy,
+    gl::GLFeature::texture_float,
+    gl::GLFeature::texture_half_float,
+    gl::GLFeature::texture_half_float_linear,
+    gl::GLFeature::texture_non_power_of_two,
+    gl::GLFeature::texture_storage,
+    gl::GLFeature::transform_feedback2,
+    gl::GLFeature::uniform_buffer_object,
+    gl::GLFeature::uniform_matrix_nonsquare,
+    gl::GLFeature::vertex_array_object};
+
+bool WebGLContext::InitWebGL2(FailureReason* const out_failReason) {
+  MOZ_ASSERT(IsWebGL2(), "WebGLContext is not a WebGL 2 context!");
+
+  std::vector<gl::GLFeature> missingList;
+
+  const auto fnGatherMissing = [&](gl::GLFeature cur) {
+    if (!gl->IsSupported(cur)) {
+      missingList.push_back(cur);
+    }
+  };
+
+  const auto fnGatherMissing2 = [&](gl::GLFeature main, gl::GLFeature alt) {
+    if (!gl->IsSupported(main) && !gl->IsSupported(alt)) {
+      missingList.push_back(main);
+    }
+  };
+
+  ////
+
+  for (const auto& cur : kRequiredFeatures) {
+    fnGatherMissing(cur);
+  }
+
+  // On desktop, we fake occlusion_query_boolean with occlusion_query if
+  // necessary. (See WebGL2ContextQueries.cpp)
+  fnGatherMissing2(gl::GLFeature::occlusion_query_boolean,
+                   gl::GLFeature::occlusion_query);
+
+#ifdef XP_MACOSX
+  // On OSX, GL core profile is used. This requires texture swizzle
+  // support to emulate legacy texture formats: ALPHA, LUMINANCE,
+  // and LUMINANCE_ALPHA.
+  fnGatherMissing(gl::GLFeature::texture_swizzle);
+#endif
+
+  fnGatherMissing2(gl::GLFeature::prim_restart_fixed,
+                   gl::GLFeature::prim_restart);
+
+  ////
+
+  if (!missingList.empty()) {
+    nsAutoCString exts;
+    for (auto itr = missingList.begin(); itr != missingList.end(); ++itr) {
+      exts.AppendLiteral("\n  ");
+      exts.Append(gl::GLContext::GetFeatureName(*itr));
+    }
+
+    const nsPrintfCString reason(
+        "WebGL 2 requires support for the following"
+        " features: %s",
+        exts.BeginReading());
+    *out_failReason = FailureReason("FEATURE_FAILURE_WEBGL2_OCCL", reason);
+    return false;
+  }
+
+  mGLMinProgramTexelOffset =
+      gl->GetIntAs<uint32_t>(LOCAL_GL_MIN_PROGRAM_TEXEL_OFFSET);
+  mGLMaxProgramTexelOffset =
+      gl->GetIntAs<uint32_t>(LOCAL_GL_MAX_PROGRAM_TEXEL_OFFSET);
+
+  mIndexedUniformBufferBindings.resize(mLimits->maxUniformBufferBindings);
+
+  mDefaultTransformFeedback = new WebGLTransformFeedback(this, 0);
+  mBoundTransformFeedback = mDefaultTransformFeedback;
+
+  gl->fGenTransformFeedbacks(1, &mEmptyTFO);
+
+  ////
+
+  if (!gl->IsGLES()) {
+    // Desktop OpenGL requires the following to be enabled in order to
+    // support sRGB operations on framebuffers.
+    gl->fEnable(LOCAL_GL_FRAMEBUFFER_SRGB_EXT);
+  }
+
+  if (gl->IsSupported(gl::GLFeature::prim_restart_fixed)) {
+    gl->fEnable(LOCAL_GL_PRIMITIVE_RESTART_FIXED_INDEX);
+  } else {
+    MOZ_ASSERT(gl->IsSupported(gl::GLFeature::prim_restart));
+  }
+
+  //////
+
+  return true;
+}
+
+// -
+
+/*virtual*/
+bool WebGL2Context::IsTexParamValid(GLenum pname) const {
+  switch (pname) {
+    case LOCAL_GL_TEXTURE_BASE_LEVEL:
+    case LOCAL_GL_TEXTURE_COMPARE_FUNC:
+    case LOCAL_GL_TEXTURE_COMPARE_MODE:
+    case LOCAL_GL_TEXTURE_IMMUTABLE_FORMAT:
+    case LOCAL_GL_TEXTURE_IMMUTABLE_LEVELS:
+    case LOCAL_GL_TEXTURE_MAX_LEVEL:
+    case LOCAL_GL_TEXTURE_WRAP_R:
+    case LOCAL_GL_TEXTURE_MAX_LOD:
+    case LOCAL_GL_TEXTURE_MIN_LOD:
+      return true;
+
+    default:
+      return WebGLContext::IsTexParamValid(pname);
+  }
+}
+
+}  // namespace mozilla