Add m-esr52 at 52.6.0

1 files changed, 480 insertions, 0 deletions

diff --git a/dom/canvas/WebGLContextExtensions.cpp b/dom/canvas/WebGLContextExtensions.cpp
new file mode 100644
index 000000000..28ba14fa2
--- /dev/null
+++ b/dom/canvas/WebGLContextExtensions.cpp
@@ -0,0 +1,480 @@
+/* -*- Mode: C++; tab-width: 4; 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 "WebGLContext.h"
+#include "WebGLContextUtils.h"
+#include "WebGLExtensions.h"
+#include "gfxPrefs.h"
+#include "GLContext.h"
+
+#include "nsString.h"
+#include "mozilla/Preferences.h"
+#include "mozilla/dom/BindingDeclarations.h"
+#include "AccessCheck.h"
+
+namespace mozilla {
+
+/*static*/ const char*
+WebGLContext::GetExtensionString(WebGLExtensionID ext)
+{
+    typedef EnumeratedArray<WebGLExtensionID, WebGLExtensionID::Max,
+                            const char*> names_array_t;
+
+    static names_array_t sExtensionNamesEnumeratedArray;
+    static bool initialized = false;
+
+    if (!initialized) {
+        initialized = true;
+
+#define WEBGL_EXTENSION_IDENTIFIER(x) \
+        sExtensionNamesEnumeratedArray[WebGLExtensionID::x] = #x;
+
+        WEBGL_EXTENSION_IDENTIFIER(ANGLE_instanced_arrays)
+        WEBGL_EXTENSION_IDENTIFIER(EXT_blend_minmax)
+        WEBGL_EXTENSION_IDENTIFIER(EXT_color_buffer_float)
+        WEBGL_EXTENSION_IDENTIFIER(EXT_color_buffer_half_float)
+        WEBGL_EXTENSION_IDENTIFIER(EXT_frag_depth)
+        WEBGL_EXTENSION_IDENTIFIER(EXT_shader_texture_lod)
+        WEBGL_EXTENSION_IDENTIFIER(EXT_sRGB)
+        WEBGL_EXTENSION_IDENTIFIER(EXT_texture_filter_anisotropic)
+        WEBGL_EXTENSION_IDENTIFIER(EXT_disjoint_timer_query)
+        WEBGL_EXTENSION_IDENTIFIER(OES_element_index_uint)
+        WEBGL_EXTENSION_IDENTIFIER(OES_standard_derivatives)
+        WEBGL_EXTENSION_IDENTIFIER(OES_texture_float)
+        WEBGL_EXTENSION_IDENTIFIER(OES_texture_float_linear)
+        WEBGL_EXTENSION_IDENTIFIER(OES_texture_half_float)
+        WEBGL_EXTENSION_IDENTIFIER(OES_texture_half_float_linear)
+        WEBGL_EXTENSION_IDENTIFIER(OES_vertex_array_object)
+        WEBGL_EXTENSION_IDENTIFIER(WEBGL_color_buffer_float)
+        WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_atc)
+        WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_etc)
+        WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_etc1)
+        WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_pvrtc)
+        WEBGL_EXTENSION_IDENTIFIER(WEBGL_compressed_texture_s3tc)
+        WEBGL_EXTENSION_IDENTIFIER(WEBGL_debug_renderer_info)
+        WEBGL_EXTENSION_IDENTIFIER(WEBGL_debug_shaders)
+        WEBGL_EXTENSION_IDENTIFIER(WEBGL_depth_texture)
+        WEBGL_EXTENSION_IDENTIFIER(WEBGL_draw_buffers)
+        WEBGL_EXTENSION_IDENTIFIER(WEBGL_lose_context)
+
+#undef WEBGL_EXTENSION_IDENTIFIER
+    }
+
+    return sExtensionNamesEnumeratedArray[ext];
+}
+
+bool
+WebGLContext::IsExtensionEnabled(WebGLExtensionID ext) const
+{
+    return mExtensions[ext];
+}
+
+bool WebGLContext::IsExtensionSupported(dom::CallerType callerType,
+                                        WebGLExtensionID ext) const
+{
+    bool allowPrivilegedExts = false;
+
+    // Chrome contexts need access to debug information even when
+    // webgl.disable-extensions is set. This is used in the graphics
+    // section of about:support
+    if (callerType == dom::CallerType::System) {
+        allowPrivilegedExts = true;
+    }
+
+    if (gfxPrefs::WebGLPrivilegedExtensionsEnabled()) {
+        allowPrivilegedExts = true;
+    }
+
+    if (allowPrivilegedExts) {
+        switch (ext) {
+        case WebGLExtensionID::WEBGL_debug_renderer_info:
+            return true;
+        case WebGLExtensionID::WEBGL_debug_shaders:
+            return true;
+        default:
+            // For warnings-as-errors.
+            break;
+        }
+    }
+
+    return IsExtensionSupported(ext);
+}
+
+bool
+WebGLContext::IsExtensionSupported(WebGLExtensionID ext) const
+{
+    if (mDisableExtensions)
+        return false;
+
+    // Extensions for both WebGL 1 and 2.
+    switch (ext) {
+    // In alphabetical order
+    // EXT_
+    case WebGLExtensionID::EXT_disjoint_timer_query:
+        return WebGLExtensionDisjointTimerQuery::IsSupported(this);
+    case WebGLExtensionID::EXT_texture_filter_anisotropic:
+        return gl->IsExtensionSupported(gl::GLContext::EXT_texture_filter_anisotropic);
+
+    // OES_
+    case WebGLExtensionID::OES_texture_float_linear:
+        return gl->IsSupported(gl::GLFeature::texture_float_linear);
+
+    // WEBGL_
+    case WebGLExtensionID::WEBGL_compressed_texture_atc:
+        return gl->IsExtensionSupported(gl::GLContext::AMD_compressed_ATC_texture);
+    case WebGLExtensionID::WEBGL_compressed_texture_etc:
+        return gl->IsSupported(gl::GLFeature::ES3_compatibility);
+    case WebGLExtensionID::WEBGL_compressed_texture_etc1:
+        return gl->IsExtensionSupported(gl::GLContext::OES_compressed_ETC1_RGB8_texture);
+    case WebGLExtensionID::WEBGL_compressed_texture_pvrtc:
+        return gl->IsExtensionSupported(gl::GLContext::IMG_texture_compression_pvrtc);
+    case WebGLExtensionID::WEBGL_compressed_texture_s3tc:
+        if (gl->IsExtensionSupported(gl::GLContext::EXT_texture_compression_s3tc))
+            return true;
+
+        return gl->IsExtensionSupported(gl::GLContext::EXT_texture_compression_dxt1) &&
+               gl->IsExtensionSupported(gl::GLContext::ANGLE_texture_compression_dxt3) &&
+               gl->IsExtensionSupported(gl::GLContext::ANGLE_texture_compression_dxt5);
+
+    case WebGLExtensionID::WEBGL_debug_renderer_info:
+        return Preferences::GetBool("webgl.enable-debug-renderer-info", false);
+
+    case WebGLExtensionID::WEBGL_lose_context:
+        // We always support this extension.
+        return true;
+
+    default:
+        // For warnings-as-errors.
+        break;
+    }
+
+    if (IsWebGL2()) {
+        // WebGL2-only extensions
+        switch (ext) {
+        // EXT_
+        case WebGLExtensionID::EXT_color_buffer_float:
+            return WebGLExtensionEXTColorBufferFloat::IsSupported(this);
+
+        default:
+            // For warnings-as-errors.
+            break;
+        }
+    } else {
+        // WebGL1-only extensions
+        switch (ext) {
+        // ANGLE_
+        case WebGLExtensionID::ANGLE_instanced_arrays:
+            return WebGLExtensionInstancedArrays::IsSupported(this);
+
+        // EXT_
+        case WebGLExtensionID::EXT_blend_minmax:
+            return WebGLExtensionBlendMinMax::IsSupported(this);
+        case WebGLExtensionID::EXT_color_buffer_half_float:
+            return WebGLExtensionColorBufferHalfFloat::IsSupported(this);
+        case WebGLExtensionID::EXT_frag_depth:
+            return WebGLExtensionFragDepth::IsSupported(this);
+        case WebGLExtensionID::EXT_shader_texture_lod:
+            return gl->IsSupported(gl::GLFeature::shader_texture_lod);
+        case WebGLExtensionID::EXT_sRGB:
+            return WebGLExtensionSRGB::IsSupported(this);
+
+        // OES_
+        case WebGLExtensionID::OES_element_index_uint:
+            return gl->IsSupported(gl::GLFeature::element_index_uint);
+        case WebGLExtensionID::OES_standard_derivatives:
+            return gl->IsSupported(gl::GLFeature::standard_derivatives);
+        case WebGLExtensionID::OES_texture_float:
+            return WebGLExtensionTextureFloat::IsSupported(this);
+        case WebGLExtensionID::OES_texture_half_float:
+            return WebGLExtensionTextureHalfFloat::IsSupported(this);
+        case WebGLExtensionID::OES_texture_half_float_linear:
+            return gl->IsSupported(gl::GLFeature::texture_half_float_linear);
+
+        case WebGLExtensionID::OES_vertex_array_object:
+            return true;
+
+        // WEBGL_
+        case WebGLExtensionID::WEBGL_color_buffer_float:
+            return WebGLExtensionColorBufferFloat::IsSupported(this);
+        case WebGLExtensionID::WEBGL_depth_texture:
+            // WEBGL_depth_texture supports DEPTH_STENCIL textures
+            if (!gl->IsSupported(gl::GLFeature::packed_depth_stencil))
+                return false;
+
+            return gl->IsSupported(gl::GLFeature::depth_texture) ||
+                   gl->IsExtensionSupported(gl::GLContext::ANGLE_depth_texture);
+        case WebGLExtensionID::WEBGL_draw_buffers:
+            return WebGLExtensionDrawBuffers::IsSupported(this);
+        default:
+            // For warnings-as-errors.
+            break;
+        }
+
+        if (gfxPrefs::WebGLDraftExtensionsEnabled()) {
+            /*
+            switch (ext) {
+            default:
+                // For warnings-as-errors.
+                break;
+            }
+            */
+        }
+    }
+
+    return false;
+}
+
+static bool
+CompareWebGLExtensionName(const nsACString& name, const char* other)
+{
+    return name.Equals(other, nsCaseInsensitiveCStringComparator());
+}
+
+WebGLExtensionBase*
+WebGLContext::EnableSupportedExtension(dom::CallerType callerType,
+                                       WebGLExtensionID ext)
+{
+    if (!IsExtensionEnabled(ext)) {
+        if (!IsExtensionSupported(callerType, ext))
+            return nullptr;
+
+        EnableExtension(ext);
+    }
+
+    return mExtensions[ext];
+}
+
+void
+WebGLContext::GetExtension(JSContext* cx,
+                           const nsAString& wideName,
+                           JS::MutableHandle<JSObject*> retval,
+                           dom::CallerType callerType,
+                           ErrorResult& rv)
+{
+    retval.set(nullptr);
+
+    if (IsContextLost())
+        return;
+
+    NS_LossyConvertUTF16toASCII name(wideName);
+
+    WebGLExtensionID ext = WebGLExtensionID::Unknown;
+
+    // step 1: figure what extension is wanted
+    for (size_t i = 0; i < size_t(WebGLExtensionID::Max); i++) {
+        WebGLExtensionID extension = WebGLExtensionID(i);
+
+        if (CompareWebGLExtensionName(name, GetExtensionString(extension))) {
+            ext = extension;
+            break;
+        }
+    }
+
+    if (ext == WebGLExtensionID::Unknown) {
+        // We keep backward compatibility for these deprecated vendor-prefixed
+        // alias. Do not add new ones anymore. Hide it behind the
+        // webgl.enable-draft-extensions flag instead.
+
+        if (CompareWebGLExtensionName(name, "MOZ_WEBGL_lose_context")) {
+            ext = WebGLExtensionID::WEBGL_lose_context;
+
+        } else if (CompareWebGLExtensionName(name, "MOZ_WEBGL_compressed_texture_s3tc")) {
+            ext = WebGLExtensionID::WEBGL_compressed_texture_s3tc;
+
+        } else if (CompareWebGLExtensionName(name, "MOZ_WEBGL_compressed_texture_atc")) {
+            ext = WebGLExtensionID::WEBGL_compressed_texture_atc;
+
+        } else if (CompareWebGLExtensionName(name, "MOZ_WEBGL_compressed_texture_pvrtc")) {
+            ext = WebGLExtensionID::WEBGL_compressed_texture_pvrtc;
+
+        } else if (CompareWebGLExtensionName(name, "MOZ_WEBGL_depth_texture")) {
+            ext = WebGLExtensionID::WEBGL_depth_texture;
+        }
+
+        if (ext != WebGLExtensionID::Unknown) {
+            GenerateWarning("getExtension('%s'): MOZ_ prefixed WebGL extension"
+                            " strings are deprecated. Support for them will be"
+                            " removed in the future. Use unprefixed extension"
+                            " strings. To get draft extensions, set the"
+                            " webgl.enable-draft-extensions preference.",
+                            name.get());
+        }
+    }
+
+    if (ext == WebGLExtensionID::Unknown)
+        return;
+
+    // step 2: check if the extension is supported
+    if (!IsExtensionSupported(callerType, ext))
+        return;
+
+    // step 3: if the extension hadn't been previously been created, create it now, thus enabling it
+    WebGLExtensionBase* extObj = EnableSupportedExtension(callerType, ext);
+    if (!extObj)
+        return;
+
+    // Step 4: Enable any implied extensions.
+    switch (ext) {
+    case WebGLExtensionID::OES_texture_float:
+        EnableSupportedExtension(callerType,
+                                 WebGLExtensionID::WEBGL_color_buffer_float);
+        break;
+
+    case WebGLExtensionID::OES_texture_half_float:
+        EnableSupportedExtension(callerType,
+                                 WebGLExtensionID::EXT_color_buffer_half_float);
+        break;
+
+    default:
+        break;
+    }
+
+    retval.set(WebGLObjectAsJSObject(cx, extObj, rv));
+}
+
+void
+WebGLContext::EnableExtension(WebGLExtensionID ext)
+{
+    MOZ_ASSERT(IsExtensionEnabled(ext) == false);
+
+    WebGLExtensionBase* obj = nullptr;
+    switch (ext) {
+    // ANGLE_
+    case WebGLExtensionID::ANGLE_instanced_arrays:
+        obj = new WebGLExtensionInstancedArrays(this);
+        break;
+
+    // EXT_
+    case WebGLExtensionID::EXT_blend_minmax:
+        obj = new WebGLExtensionBlendMinMax(this);
+        break;
+    case WebGLExtensionID::EXT_color_buffer_float:
+        obj = new WebGLExtensionEXTColorBufferFloat(this);
+        break;
+    case WebGLExtensionID::EXT_color_buffer_half_float:
+        obj = new WebGLExtensionColorBufferHalfFloat(this);
+        break;
+    case WebGLExtensionID::EXT_disjoint_timer_query:
+        obj = new WebGLExtensionDisjointTimerQuery(this);
+        break;
+    case WebGLExtensionID::EXT_frag_depth:
+        obj = new WebGLExtensionFragDepth(this);
+        break;
+    case WebGLExtensionID::EXT_shader_texture_lod:
+        obj = new WebGLExtensionShaderTextureLod(this);
+        break;
+    case WebGLExtensionID::EXT_sRGB:
+        obj = new WebGLExtensionSRGB(this);
+        break;
+    case WebGLExtensionID::EXT_texture_filter_anisotropic:
+        obj = new WebGLExtensionTextureFilterAnisotropic(this);
+        break;
+
+    // OES_
+    case WebGLExtensionID::OES_element_index_uint:
+        obj = new WebGLExtensionElementIndexUint(this);
+        break;
+    case WebGLExtensionID::OES_standard_derivatives:
+        obj = new WebGLExtensionStandardDerivatives(this);
+        break;
+    case WebGLExtensionID::OES_texture_float:
+        obj = new WebGLExtensionTextureFloat(this);
+        break;
+    case WebGLExtensionID::OES_texture_float_linear:
+        obj = new WebGLExtensionTextureFloatLinear(this);
+        break;
+    case WebGLExtensionID::OES_texture_half_float:
+        obj = new WebGLExtensionTextureHalfFloat(this);
+        break;
+    case WebGLExtensionID::OES_texture_half_float_linear:
+        obj = new WebGLExtensionTextureHalfFloatLinear(this);
+        break;
+    case WebGLExtensionID::OES_vertex_array_object:
+        obj = new WebGLExtensionVertexArray(this);
+        break;
+
+    // WEBGL_
+    case WebGLExtensionID::WEBGL_color_buffer_float:
+        obj = new WebGLExtensionColorBufferFloat(this);
+        break;
+    case WebGLExtensionID::WEBGL_compressed_texture_atc:
+        obj = new WebGLExtensionCompressedTextureATC(this);
+        break;
+    case WebGLExtensionID::WEBGL_compressed_texture_etc:
+        obj = new WebGLExtensionCompressedTextureES3(this);
+        break;
+    case WebGLExtensionID::WEBGL_compressed_texture_etc1:
+        obj = new WebGLExtensionCompressedTextureETC1(this);
+        break;
+    case WebGLExtensionID::WEBGL_compressed_texture_pvrtc:
+        obj = new WebGLExtensionCompressedTexturePVRTC(this);
+        break;
+    case WebGLExtensionID::WEBGL_compressed_texture_s3tc:
+        obj = new WebGLExtensionCompressedTextureS3TC(this);
+        break;
+    case WebGLExtensionID::WEBGL_debug_renderer_info:
+        obj = new WebGLExtensionDebugRendererInfo(this);
+        break;
+    case WebGLExtensionID::WEBGL_debug_shaders:
+        obj = new WebGLExtensionDebugShaders(this);
+        break;
+    case WebGLExtensionID::WEBGL_depth_texture:
+        obj = new WebGLExtensionDepthTexture(this);
+        break;
+    case WebGLExtensionID::WEBGL_draw_buffers:
+        obj = new WebGLExtensionDrawBuffers(this);
+        break;
+    case WebGLExtensionID::WEBGL_lose_context:
+        obj = new WebGLExtensionLoseContext(this);
+        break;
+
+    default:
+        MOZ_ASSERT(false, "should not get there.");
+    }
+
+    mExtensions[ext] = obj;
+}
+
+void
+WebGLContext::GetSupportedExtensions(dom::Nullable< nsTArray<nsString> >& retval,
+                                     dom::CallerType callerType)
+{
+    retval.SetNull();
+    if (IsContextLost())
+        return;
+
+    nsTArray<nsString>& arr = retval.SetValue();
+
+    for (size_t i = 0; i < size_t(WebGLExtensionID::Max); i++) {
+        WebGLExtensionID extension = WebGLExtensionID(i);
+
+        if (IsExtensionSupported(callerType, extension)) {
+            const char* extStr = GetExtensionString(extension);
+            arr.AppendElement(NS_ConvertUTF8toUTF16(extStr));
+        }
+    }
+
+    /**
+     * We keep backward compatibility for these deprecated vendor-prefixed
+     * alias. Do not add new ones anymore. Hide it behind the
+     * webgl.enable-draft-extensions flag instead.
+     */
+    if (IsExtensionSupported(callerType, WebGLExtensionID::WEBGL_lose_context))
+        arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_lose_context"));
+    if (IsExtensionSupported(callerType,
+                             WebGLExtensionID::WEBGL_compressed_texture_s3tc))
+        arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_compressed_texture_s3tc"));
+    if (IsExtensionSupported(callerType,
+                             WebGLExtensionID::WEBGL_compressed_texture_atc))
+        arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_compressed_texture_atc"));
+    if (IsExtensionSupported(callerType,
+                             WebGLExtensionID::WEBGL_compressed_texture_pvrtc))
+        arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_compressed_texture_pvrtc"));
+    if (IsExtensionSupported(callerType,
+                             WebGLExtensionID::WEBGL_depth_texture))
+        arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_depth_texture"));
+}
+
+} // namespace mozilla