gecko-dev/dom/canvas/WebGL2Context.cpp

130 строки
3.9 KiB
C++

/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "GLContext.h"
#include "mozilla/dom/WebGL2RenderingContextBinding.h"
#include "mozilla/Preferences.h"
#include "mozilla/Telemetry.h"
using namespace mozilla;
using namespace mozilla::gl;
// -----------------------------------------------------------------------------
// CONSTRUCTOR & DESTRUCTOR
WebGL2Context::WebGL2Context()
: WebGLContext()
{
MOZ_ASSERT(IsSupported(), "not supposed to create a WebGL2Context"
"context when not supported");
}
WebGL2Context::~WebGL2Context()
{
}
// -----------------------------------------------------------------------------
// STATIC FUNCTIONS
bool
WebGL2Context::IsSupported()
{
return Preferences::GetBool("webgl.enable-prototype-webgl2", false);
}
WebGL2Context*
WebGL2Context::Create()
{
return new WebGL2Context();
}
// -----------------------------------------------------------------------------
// IMPLEMENT nsWrapperCache
JSObject*
WebGL2Context::WrapObject(JSContext *cx)
{
return dom::WebGL2RenderingContextBinding::Wrap(cx, this);
}
// -----------------------------------------------------------------------------
// WebGL 2 initialisation
bool
WebGLContext::InitWebGL2()
{
MOZ_ASSERT(IsWebGL2(), "WebGLContext is not a WebGL 2 context!");
const WebGLExtensionID sExtensionNativelySupportedArr[] = {
WebGLExtensionID::ANGLE_instanced_arrays,
WebGLExtensionID::EXT_blend_minmax,
WebGLExtensionID::OES_element_index_uint,
WebGLExtensionID::OES_standard_derivatives,
WebGLExtensionID::OES_texture_float,
WebGLExtensionID::OES_texture_float_linear,
WebGLExtensionID::OES_vertex_array_object,
WebGLExtensionID::WEBGL_depth_texture,
WebGLExtensionID::WEBGL_draw_buffers
};
const GLFeature sFeatureRequiredArr[] = {
GLFeature::instanced_non_arrays,
GLFeature::transform_feedback2
};
// check WebGL extensions that are supposed to be natively supported
for (size_t i = 0; i < size_t(MOZ_ARRAY_LENGTH(sExtensionNativelySupportedArr)); i++)
{
WebGLExtensionID extension = sExtensionNativelySupportedArr[i];
if (!IsExtensionSupported(extension)) {
GenerateWarning("WebGL 2 requires %s!", GetExtensionString(extension));
return false;
}
}
// check required OpenGL extensions
if (!gl->IsExtensionSupported(GLContext::EXT_gpu_shader4)) {
GenerateWarning("WebGL 2 requires GL_EXT_gpu_shader4!");
return false;
}
// check OpenGL features
if (!gl->IsSupported(GLFeature::occlusion_query) &&
!gl->IsSupported(GLFeature::occlusion_query_boolean))
{
/*
* on desktop, we fake occlusion_query_boolean with occlusion_query if
* necessary. See WebGLContextAsyncQueries.cpp.
*/
GenerateWarning("WebGL 2 requires occlusion queries!");
return false;
}
for (size_t i = 0; i < size_t(MOZ_ARRAY_LENGTH(sFeatureRequiredArr)); i++)
{
if (!gl->IsSupported(sFeatureRequiredArr[i])) {
GenerateWarning("WebGL 2 requires GLFeature::%s!", GLContext::GetFeatureName(sFeatureRequiredArr[i]));
return false;
}
}
// ok WebGL 2 is compatible, we can enable natively supported extensions.
for (size_t i = 0; i < size_t(MOZ_ARRAY_LENGTH(sExtensionNativelySupportedArr)); i++) {
EnableExtension(sExtensionNativelySupportedArr[i]);
MOZ_ASSERT(IsExtensionEnabled(sExtensionNativelySupportedArr[i]));
}
// we initialise WebGL 2 related stuff.
gl->GetUIntegerv(LOCAL_GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS, &mGLMaxTransformFeedbackSeparateAttribs);
return true;
}