michael@0: /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "WebGL2Context.h"
michael@0: #include "GLContext.h"
michael@0: #include "mozilla/dom/WebGL2RenderingContextBinding.h"
michael@0: #include "mozilla/Preferences.h"
michael@0: #include "mozilla/Telemetry.h"
michael@0: 
michael@0: using namespace mozilla;
michael@0: using namespace mozilla::gl;
michael@0: 
michael@0: // -----------------------------------------------------------------------------
michael@0: // CONSTRUCTOR & DESTRUCTOR
michael@0: 
michael@0: WebGL2Context::WebGL2Context()
michael@0:     : WebGLContext()
michael@0: {
michael@0:     MOZ_ASSERT(IsSupported(), "not supposed to create a WebGL2Context"
michael@0:                               "context when not supported");
michael@0: }
michael@0: 
michael@0: WebGL2Context::~WebGL2Context()
michael@0: {
michael@0: 
michael@0: }
michael@0: 
michael@0: 
michael@0: // -----------------------------------------------------------------------------
michael@0: // STATIC FUNCTIONS
michael@0: 
michael@0: bool
michael@0: WebGL2Context::IsSupported()
michael@0: {
michael@0:     return Preferences::GetBool("webgl.enable-prototype-webgl2", false);
michael@0: }
michael@0: 
michael@0: WebGL2Context*
michael@0: WebGL2Context::Create()
michael@0: {
michael@0:     return new WebGL2Context();
michael@0: }
michael@0: 
michael@0: 
michael@0: // -----------------------------------------------------------------------------
michael@0: // IMPLEMENT nsWrapperCache
michael@0: 
michael@0: JSObject*
michael@0: WebGL2Context::WrapObject(JSContext *cx)
michael@0: {
michael@0:     return dom::WebGL2RenderingContextBinding::Wrap(cx, this);
michael@0: }
michael@0: 
michael@0: 
michael@0: // -----------------------------------------------------------------------------
michael@0: // WebGL 2 initialisation
michael@0: 
michael@0: bool
michael@0: WebGLContext::InitWebGL2()
michael@0: {
michael@0:     MOZ_ASSERT(IsWebGL2(), "WebGLContext is not a WebGL 2 context!");
michael@0: 
michael@0:     const WebGLExtensionID sExtensionNativelySupportedArr[] = {
michael@0:         WebGLExtensionID::ANGLE_instanced_arrays,
michael@0:         WebGLExtensionID::OES_element_index_uint,
michael@0:         WebGLExtensionID::OES_standard_derivatives,
michael@0:         WebGLExtensionID::OES_texture_float,
michael@0:         WebGLExtensionID::OES_texture_float_linear,
michael@0:         WebGLExtensionID::OES_vertex_array_object,
michael@0:         WebGLExtensionID::WEBGL_depth_texture,
michael@0:         WebGLExtensionID::WEBGL_draw_buffers
michael@0:     };
michael@0:     const GLFeature sFeatureRequiredArr[] = {
michael@0:         GLFeature::blend_minmax,
michael@0:         GLFeature::instanced_non_arrays,
michael@0:         GLFeature::transform_feedback
michael@0:     };
michael@0: 
michael@0:     // check WebGL extensions that are supposed to be natively supported
michael@0:     for (size_t i = 0; i < size_t(MOZ_ARRAY_LENGTH(sExtensionNativelySupportedArr)); i++)
michael@0:     {
michael@0:         WebGLExtensionID extension = sExtensionNativelySupportedArr[i];
michael@0: 
michael@0:         if (!IsExtensionSupported(extension)) {
michael@0:             GenerateWarning("WebGL 2 requires %s!", GetExtensionString(extension));
michael@0:             return false;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     // check required OpenGL extensions
michael@0:     if (!gl->IsExtensionSupported(GLContext::EXT_gpu_shader4)) {
michael@0:         GenerateWarning("WebGL 2 requires GL_EXT_gpu_shader4!");
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     // check OpenGL features
michael@0:     if (!gl->IsSupported(GLFeature::occlusion_query) &&
michael@0:         !gl->IsSupported(GLFeature::occlusion_query_boolean))
michael@0:     {
michael@0:         /*
michael@0:          * on desktop, we fake occlusion_query_boolean with occlusion_query if
michael@0:          * necessary. See WebGLContextAsyncQueries.cpp.
michael@0:          */
michael@0:         GenerateWarning("WebGL 2 requires occlusion queries!");
michael@0:         return false;
michael@0:     }
michael@0: 
michael@0:     for (size_t i = 0; i < size_t(MOZ_ARRAY_LENGTH(sFeatureRequiredArr)); i++)
michael@0:     {
michael@0:         if (!gl->IsSupported(sFeatureRequiredArr[i])) {
michael@0:             GenerateWarning("WebGL 2 requires GLFeature::%s!", GLContext::GetFeatureName(sFeatureRequiredArr[i]));
michael@0:             return false;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     // ok WebGL 2 is compatible, we can enable natively supported extensions.
michael@0:     for (size_t i = 0; i < size_t(MOZ_ARRAY_LENGTH(sExtensionNativelySupportedArr)); i++) {
michael@0:         EnableExtension(sExtensionNativelySupportedArr[i]);
michael@0: 
michael@0:         MOZ_ASSERT(IsExtensionEnabled(sExtensionNativelySupportedArr[i]));
michael@0:     }
michael@0: 
michael@0:     // we initialise WebGL 2 related stuff.
michael@0:     gl->GetUIntegerv(LOCAL_GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS, &mGLMaxTransformFeedbackSeparateAttribs);
michael@0: 
michael@0:     return true;
michael@0: }