mirror of
https://github.com/mozilla/gecko-dev.git
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385 lines
15 KiB
C++
385 lines
15 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "WebGLContext.h"
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#include "WebGLContextUtils.h"
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#include "WebGLExtensions.h"
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#include "GLContext.h"
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#include "nsString.h"
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#include "mozilla/Preferences.h"
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#include "AccessCheck.h"
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using namespace mozilla;
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using namespace mozilla::gl;
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/* static */ const char*
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WebGLContext::GetExtensionString(WebGLExtensionID ext)
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{
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typedef EnumeratedArray<WebGLExtensionID, WebGLExtensionID::Max, const char*>
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names_array_t;
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static names_array_t sExtensionNamesEnumeratedArray;
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static bool initialized = false;
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if (!initialized) {
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initialized = true;
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#define WEBGL_EXTENSION_IDENTIFIER(x) \
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sExtensionNamesEnumeratedArray[WebGLExtensionID::x] = #x;
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WEBGL_EXTENSION_IDENTIFIER(ANGLE_instanced_arrays)
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WEBGL_EXTENSION_IDENTIFIER(EXT_blend_minmax)
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WEBGL_EXTENSION_IDENTIFIER(EXT_color_buffer_half_float)
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WEBGL_EXTENSION_IDENTIFIER(EXT_frag_depth)
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WEBGL_EXTENSION_IDENTIFIER(EXT_sRGB)
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WEBGL_EXTENSION_IDENTIFIER(EXT_shader_texture_lod)
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WEBGL_EXTENSION_IDENTIFIER(EXT_texture_filter_anisotropic)
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WEBGL_EXTENSION_IDENTIFIER(OES_element_index_uint)
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WEBGL_EXTENSION_IDENTIFIER(OES_standard_derivatives)
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WEBGL_EXTENSION_IDENTIFIER(OES_texture_float)
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WEBGL_EXTENSION_IDENTIFIER(OES_texture_float_linear)
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WEBGL_EXTENSION_IDENTIFIER(OES_texture_half_float)
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WEBGL_EXTENSION_IDENTIFIER(OES_texture_half_float_linear)
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WEBGL_EXTENSION_IDENTIFIER(OES_vertex_array_object)
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WEBGL_EXTENSION_IDENTIFIER(WEBGL_color_buffer_float)
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WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_atc)
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WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_etc1)
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WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_pvrtc)
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WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_s3tc)
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WEBGL_EXTENSION_IDENTIFIER(WEBGL_debug_renderer_info)
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WEBGL_EXTENSION_IDENTIFIER(WEBGL_debug_shaders)
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WEBGL_EXTENSION_IDENTIFIER(WEBGL_depth_texture)
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WEBGL_EXTENSION_IDENTIFIER(WEBGL_draw_buffers)
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WEBGL_EXTENSION_IDENTIFIER(WEBGL_lose_context)
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#undef WEBGL_EXTENSION_IDENTIFIER
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}
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return sExtensionNamesEnumeratedArray[ext];
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}
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bool
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WebGLContext::IsExtensionEnabled(WebGLExtensionID ext) const {
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return mExtensions[ext];
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}
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bool WebGLContext::IsExtensionSupported(JSContext *cx, WebGLExtensionID ext) const
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{
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bool allowPrivilegedExts = false;
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// Chrome contexts need access to debug information even when
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// webgl.disable-extensions is set. This is used in the graphics
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// section of about:support.
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if (xpc::AccessCheck::isChrome(js::GetContextCompartment(cx)))
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allowPrivilegedExts = true;
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if (Preferences::GetBool("webgl.enable-privileged-extensions", false))
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allowPrivilegedExts = true;
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if (allowPrivilegedExts) {
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switch (ext) {
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case WebGLExtensionID::WEBGL_debug_renderer_info:
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return true;
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case WebGLExtensionID::WEBGL_debug_shaders:
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return true;
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default:
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// For warnings-as-errors.
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break;
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}
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}
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return IsExtensionSupported(ext);
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}
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bool WebGLContext::IsExtensionSupported(WebGLExtensionID ext) const
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{
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if (mDisableExtensions) {
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return false;
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}
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switch (ext) {
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case WebGLExtensionID::OES_element_index_uint:
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return gl->IsSupported(GLFeature::element_index_uint);
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case WebGLExtensionID::OES_standard_derivatives:
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return gl->IsSupported(GLFeature::standard_derivatives);
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case WebGLExtensionID::WEBGL_lose_context:
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// We always support this extension.
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return true;
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case WebGLExtensionID::OES_texture_float:
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return gl->IsSupported(GLFeature::texture_float);
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case WebGLExtensionID::OES_texture_float_linear:
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return gl->IsSupported(GLFeature::texture_float_linear);
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case WebGLExtensionID::OES_texture_half_float:
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// If we have Feature::texture_half_float, we must not be on ES2
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// and need to translate HALF_FLOAT_OES -> HALF_FLOAT. We do that
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// right before making the relevant calls.
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return gl->IsExtensionSupported(GLContext::OES_texture_half_float) ||
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gl->IsSupported(GLFeature::texture_half_float);
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case WebGLExtensionID::OES_texture_half_float_linear:
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return gl->IsSupported(GLFeature::texture_half_float_linear);
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case WebGLExtensionID::OES_vertex_array_object:
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return WebGLExtensionVertexArray::IsSupported(this);
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case WebGLExtensionID::EXT_texture_filter_anisotropic:
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return gl->IsExtensionSupported(GLContext::EXT_texture_filter_anisotropic);
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case WebGLExtensionID::WEBGL_compressed_texture_s3tc:
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if (gl->IsExtensionSupported(GLContext::EXT_texture_compression_s3tc)) {
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return true;
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}
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else if (gl->IsExtensionSupported(GLContext::EXT_texture_compression_dxt1) &&
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gl->IsExtensionSupported(GLContext::ANGLE_texture_compression_dxt3) &&
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gl->IsExtensionSupported(GLContext::ANGLE_texture_compression_dxt5))
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{
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return true;
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}
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return false;
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case WebGLExtensionID::WEBGL_compressed_texture_atc:
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return gl->IsExtensionSupported(GLContext::AMD_compressed_ATC_texture);
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case WebGLExtensionID::WEBGL_compressed_texture_etc1:
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return gl->IsExtensionSupported(GLContext::OES_compressed_ETC1_RGB8_texture);
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case WebGLExtensionID::WEBGL_compressed_texture_pvrtc:
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return gl->IsExtensionSupported(GLContext::IMG_texture_compression_pvrtc);
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case WebGLExtensionID::WEBGL_depth_texture:
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// WEBGL_depth_texture supports DEPTH_STENCIL textures
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if (!gl->IsSupported(GLFeature::packed_depth_stencil)) {
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return false;
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}
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return gl->IsSupported(GLFeature::depth_texture) ||
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gl->IsExtensionSupported(GLContext::ANGLE_depth_texture);
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case WebGLExtensionID::ANGLE_instanced_arrays:
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return WebGLExtensionInstancedArrays::IsSupported(this);
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case WebGLExtensionID::EXT_sRGB:
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return WebGLExtensionSRGB::IsSupported(this);
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case WebGLExtensionID::WEBGL_draw_buffers:
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return WebGLExtensionDrawBuffers::IsSupported(this);
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case WebGLExtensionID::EXT_frag_depth:
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return WebGLExtensionFragDepth::IsSupported(this);
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case WebGLExtensionID::EXT_shader_texture_lod:
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return gl->IsExtensionSupported(GLContext::EXT_shader_texture_lod);
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default:
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// For warnings-as-errors.
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break;
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}
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if (Preferences::GetBool("webgl.enable-draft-extensions", false) || IsWebGL2()) {
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switch (ext) {
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case WebGLExtensionID::EXT_blend_minmax:
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return WebGLExtensionBlendMinMax::IsSupported(this);
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case WebGLExtensionID::EXT_color_buffer_half_float:
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return WebGLExtensionColorBufferHalfFloat::IsSupported(this);
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case WebGLExtensionID::WEBGL_color_buffer_float:
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return WebGLExtensionColorBufferFloat::IsSupported(this);
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default:
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// For warnings-as-errors.
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break;
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}
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}
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return false;
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}
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static bool
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CompareWebGLExtensionName(const nsACString& name, const char *other)
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{
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return name.Equals(other, nsCaseInsensitiveCStringComparator());
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}
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void
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WebGLContext::GetExtension(JSContext *cx, const nsAString& aName,
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JS::MutableHandle<JSObject*> aRetval,
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ErrorResult& rv)
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{
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if (IsContextLost()) {
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aRetval.set(nullptr);
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return;
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}
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NS_LossyConvertUTF16toASCII name(aName);
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WebGLExtensionID ext = WebGLExtensionID::Unknown;
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// step 1: figure what extension is wanted
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for (size_t i = 0; i < size_t(WebGLExtensionID::Max); i++)
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{
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WebGLExtensionID extension = WebGLExtensionID(i);
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if (CompareWebGLExtensionName(name, GetExtensionString(extension))) {
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ext = extension;
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break;
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}
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}
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if (ext == WebGLExtensionID::Unknown)
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{
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/**
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* We keep backward compatibility for these deprecated vendor-prefixed
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* alias. Do not add new ones anymore. Hide it behind the
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* webgl.enable-draft-extensions flag instead.
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*/
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if (CompareWebGLExtensionName(name, "MOZ_WEBGL_lose_context")) {
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ext = WebGLExtensionID::WEBGL_lose_context;
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}
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else if (CompareWebGLExtensionName(name, "MOZ_WEBGL_compressed_texture_s3tc")) {
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ext = WebGLExtensionID::WEBGL_compressed_texture_s3tc;
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}
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else if (CompareWebGLExtensionName(name, "MOZ_WEBGL_compressed_texture_atc")) {
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ext = WebGLExtensionID::WEBGL_compressed_texture_atc;
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}
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else if (CompareWebGLExtensionName(name, "MOZ_WEBGL_compressed_texture_pvrtc")) {
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ext = WebGLExtensionID::WEBGL_compressed_texture_pvrtc;
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}
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else if (CompareWebGLExtensionName(name, "MOZ_WEBGL_depth_texture")) {
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ext = WebGLExtensionID::WEBGL_depth_texture;
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}
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if (ext != WebGLExtensionID::Unknown) {
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GenerateWarning("getExtension('%s'): MOZ_ prefixed WebGL extension strings are deprecated. "
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"Support for them will be removed in the future. Use unprefixed extension strings. "
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"To get draft extensions, set the webgl.enable-draft-extensions preference.",
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name.get());
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}
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}
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if (ext == WebGLExtensionID::Unknown) {
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aRetval.set(nullptr);
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return;
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}
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// step 2: check if the extension is supported
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if (!IsExtensionSupported(cx, ext)) {
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aRetval.set(nullptr);
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return;
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}
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// step 3: if the extension hadn't been previously been created, create it now, thus enabling it
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if (!IsExtensionEnabled(ext)) {
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EnableExtension(ext);
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}
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aRetval.set(WebGLObjectAsJSObject(cx, mExtensions[ext].get(), rv));
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}
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void
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WebGLContext::EnableExtension(WebGLExtensionID ext)
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{
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MOZ_ASSERT(IsExtensionEnabled(ext) == false);
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WebGLExtensionBase* obj = nullptr;
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switch (ext) {
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case WebGLExtensionID::OES_element_index_uint:
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obj = new WebGLExtensionElementIndexUint(this);
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break;
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case WebGLExtensionID::OES_standard_derivatives:
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obj = new WebGLExtensionStandardDerivatives(this);
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break;
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case WebGLExtensionID::EXT_texture_filter_anisotropic:
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obj = new WebGLExtensionTextureFilterAnisotropic(this);
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break;
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case WebGLExtensionID::WEBGL_lose_context:
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obj = new WebGLExtensionLoseContext(this);
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break;
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case WebGLExtensionID::WEBGL_compressed_texture_s3tc:
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obj = new WebGLExtensionCompressedTextureS3TC(this);
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break;
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case WebGLExtensionID::WEBGL_compressed_texture_atc:
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obj = new WebGLExtensionCompressedTextureATC(this);
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break;
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case WebGLExtensionID::WEBGL_compressed_texture_etc1:
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obj = new WebGLExtensionCompressedTextureETC1(this);
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break;
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case WebGLExtensionID::WEBGL_compressed_texture_pvrtc:
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obj = new WebGLExtensionCompressedTexturePVRTC(this);
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break;
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case WebGLExtensionID::WEBGL_debug_renderer_info:
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obj = new WebGLExtensionDebugRendererInfo(this);
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break;
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case WebGLExtensionID::WEBGL_debug_shaders:
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obj = new WebGLExtensionDebugShaders(this);
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break;
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case WebGLExtensionID::WEBGL_depth_texture:
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obj = new WebGLExtensionDepthTexture(this);
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break;
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case WebGLExtensionID::OES_texture_float:
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obj = new WebGLExtensionTextureFloat(this);
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break;
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case WebGLExtensionID::OES_texture_float_linear:
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obj = new WebGLExtensionTextureFloatLinear(this);
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break;
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case WebGLExtensionID::OES_texture_half_float:
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obj = new WebGLExtensionTextureHalfFloat(this);
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break;
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case WebGLExtensionID::OES_texture_half_float_linear:
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obj = new WebGLExtensionTextureHalfFloatLinear(this);
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break;
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case WebGLExtensionID::WEBGL_color_buffer_float:
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obj = new WebGLExtensionColorBufferFloat(this);
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break;
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case WebGLExtensionID::EXT_color_buffer_half_float:
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obj = new WebGLExtensionColorBufferHalfFloat(this);
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break;
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case WebGLExtensionID::WEBGL_draw_buffers:
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obj = new WebGLExtensionDrawBuffers(this);
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break;
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case WebGLExtensionID::OES_vertex_array_object:
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obj = new WebGLExtensionVertexArray(this);
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break;
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case WebGLExtensionID::ANGLE_instanced_arrays:
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obj = new WebGLExtensionInstancedArrays(this);
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break;
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case WebGLExtensionID::EXT_sRGB:
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obj = new WebGLExtensionSRGB(this);
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break;
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case WebGLExtensionID::EXT_frag_depth:
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obj = new WebGLExtensionFragDepth(this);
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break;
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case WebGLExtensionID::EXT_blend_minmax:
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obj = new WebGLExtensionBlendMinMax(this);
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break;
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case WebGLExtensionID::EXT_shader_texture_lod:
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obj = new WebGLExtensionShaderTextureLod(this);
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break;
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default:
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MOZ_ASSERT(false, "should not get there.");
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}
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mExtensions[ext] = obj;
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}
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void
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WebGLContext::GetSupportedExtensions(JSContext *cx, Nullable< nsTArray<nsString> > &retval)
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{
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retval.SetNull();
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if (IsContextLost())
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return;
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nsTArray<nsString>& arr = retval.SetValue();
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for (size_t i = 0; i < size_t(WebGLExtensionID::Max); i++)
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{
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WebGLExtensionID extension = WebGLExtensionID(i);
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if (IsExtensionSupported(cx, extension)) {
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arr.AppendElement(NS_ConvertUTF8toUTF16(GetExtensionString(extension)));
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}
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}
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/**
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* We keep backward compatibility for these deprecated vendor-prefixed
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* alias. Do not add new ones anymore. Hide it behind the
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* webgl.enable-draft-extensions flag instead.
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*/
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if (IsExtensionSupported(cx, WebGLExtensionID::WEBGL_lose_context))
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arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_lose_context"));
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if (IsExtensionSupported(cx, WebGLExtensionID::WEBGL_compressed_texture_s3tc))
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arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_compressed_texture_s3tc"));
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if (IsExtensionSupported(cx, WebGLExtensionID::WEBGL_compressed_texture_atc))
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arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_compressed_texture_atc"));
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if (IsExtensionSupported(cx, WebGLExtensionID::WEBGL_compressed_texture_pvrtc))
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arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_compressed_texture_pvrtc"));
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if (IsExtensionSupported(cx, WebGLExtensionID::WEBGL_depth_texture))
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arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_depth_texture"));
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}
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