DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Mercurial (4a108e94d3e2)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426
/* -*- 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 "GLContext.h"

#include "nsString.h"
#include "mozilla/Preferences.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_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(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_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(JSContext* cx,
                                        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 (xpc::AccessCheck::isChrome(js::GetContextCompartment(cx)))
        allowPrivilegedExts = true;

    if (Preferences::GetBool("webgl.enable-privileged-extensions", false))
        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;

    // In alphabetical order
    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->IsExtensionSupported(gl::GLContext::EXT_shader_texture_lod);
    case WebGLExtensionID::EXT_sRGB:
        return WebGLExtensionSRGB::IsSupported(this);
    case WebGLExtensionID::EXT_texture_filter_anisotropic:
        return gl->IsExtensionSupported(gl::GLContext::EXT_texture_filter_anisotropic);

    // 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 gl->IsSupported(gl::GLFeature::texture_float);
    case WebGLExtensionID::OES_texture_float_linear:
        return gl->IsSupported(gl::GLFeature::texture_float_linear);
    case WebGLExtensionID::OES_texture_half_float:
        // If we have Feature::texture_half_float, we must not be on ES2
        // and need to translate HALF_FLOAT_OES -> HALF_FLOAT.  We do that
        // right before making the relevant calls.
        return gl->IsExtensionSupported(gl::GLContext::OES_texture_half_float) ||
               gl->IsSupported(gl::GLFeature::texture_half_float);

    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_compressed_texture_atc:
        return gl->IsExtensionSupported(gl::GLContext::AMD_compressed_ATC_texture);
    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_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);
    case WebGLExtensionID::WEBGL_lose_context:
        // We always support this extension.
        return true;

    default:
        // For warnings-as-errors.
        break;
    }

    if (Preferences::GetBool("webgl.enable-draft-extensions", false) ||
        IsWebGL2())
    {
        /* None for now.
        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(JSContext* js, WebGLExtensionID ext)
{
    if (!IsExtensionEnabled(ext)) {
        if (!IsExtensionSupported(js, ext))
            return nullptr;

        EnableExtension(ext);
    }

    return mExtensions[ext];
}

void
WebGLContext::GetExtension(JSContext* cx, const nsAString& wideName,
                           JS::MutableHandle<JSObject*> retval, 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(cx, ext))
        return;

    // step 3: if the extension hadn't been previously been created, create it now, thus enabling it
    WebGLExtensionBase* extObj = EnableSupportedExtension(cx, ext);
    if (!extObj)
        return;

    // Step 4: Enable any implied extensions.
    switch (ext) {
    case WebGLExtensionID::OES_texture_float:
        EnableSupportedExtension(cx, WebGLExtensionID::WEBGL_color_buffer_float);
        break;

    case WebGLExtensionID::OES_texture_half_float:
        EnableSupportedExtension(cx, 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_half_float:
        obj = new WebGLExtensionColorBufferHalfFloat(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_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(JSContext* cx,
                                     Nullable< nsTArray<nsString> >& retval)
{
    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(cx, 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(cx, WebGLExtensionID::WEBGL_lose_context))
        arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_lose_context"));
    if (IsExtensionSupported(cx, WebGLExtensionID::WEBGL_compressed_texture_s3tc))
        arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_compressed_texture_s3tc"));
    if (IsExtensionSupported(cx, WebGLExtensionID::WEBGL_compressed_texture_atc))
        arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_compressed_texture_atc"));
    if (IsExtensionSupported(cx, WebGLExtensionID::WEBGL_compressed_texture_pvrtc))
        arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_compressed_texture_pvrtc"));
    if (IsExtensionSupported(cx, WebGLExtensionID::WEBGL_depth_texture))
        arr.AppendElement(NS_LITERAL_STRING("MOZ_WEBGL_depth_texture"));
}

} // namespace mozilla