webgl::ShaderValidator*
WebGLContext::CreateShaderValidator(GLenum shaderType) const
{
if (mBypassShaderValidation)
return nullptr;
const auto spec = (IsWebGL2() ? SH_WEBGL2_SPEC : SH_WEBGL_SPEC);
const auto outputLanguage = ShaderOutput(gl);
ShBuiltInResources resources;
memset(&resources, 0, sizeof(resources));
ShInitBuiltInResources(&resources);
resources.HashFunction = webgl::IdentifierHashFunc;
resources.MaxVertexAttribs = mGLMaxVertexAttribs;
resources.MaxVertexUniformVectors = mGLMaxVertexUniformVectors;
resources.MaxVaryingVectors = mGLMaxVaryingVectors;
resources.MaxVertexTextureImageUnits = mGLMaxVertexTextureImageUnits;
resources.MaxCombinedTextureImageUnits = mGLMaxTextureUnits;
resources.MaxTextureImageUnits = mGLMaxTextureImageUnits;
resources.MaxFragmentUniformVectors = mGLMaxFragmentUniformVectors;
const bool hasMRTs = (IsWebGL2() ||
IsExtensionEnabled(WebGLExtensionID::WEBGL_draw_buffers));
resources.MaxDrawBuffers = (hasMRTs ? mGLMaxDrawBuffers : 1);
if (IsExtensionEnabled(WebGLExtensionID::EXT_frag_depth))
resources.EXT_frag_depth = 1;
if (IsExtensionEnabled(WebGLExtensionID::OES_standard_derivatives))
resources.OES_standard_derivatives = 1;
if (IsExtensionEnabled(WebGLExtensionID::WEBGL_draw_buffers))
resources.EXT_draw_buffers = 1;
if (IsExtensionEnabled(WebGLExtensionID::EXT_shader_texture_lod))
resources.EXT_shader_texture_lod = 1;
// Tell ANGLE to allow highp in frag shaders. (unless disabled)
// If underlying GLES doesn't have highp in frag shaders, it should complain anyways.
resources.FragmentPrecisionHigh = mDisableFragHighP ? 0 : 1;
if (gl->WorkAroundDriverBugs()) {
#ifdef XP_MACOSX
if (gl->Vendor() == gl::GLVendor::NVIDIA) {
// Work around bug 890432
resources.MaxExpressionComplexity = 1000;
}
#endif
}
const auto compileOptions = webgl::ChooseValidatorCompileOptions(resources, gl);
return webgl::ShaderValidator::Create(shaderType, spec, outputLanguage, resources,
compileOptions);
}
void
WebGLContext::BindTexture(GLenum rawTarget, WebGLTexture* newTex)
{
const FuncScope funcScope(*this, "bindTexture");
if (IsContextLost())
return;
if (newTex && !ValidateObject("tex", *newTex))
return;
// Need to check rawTarget first before comparing against newTex->Target() as
// newTex->Target() returns a TexTarget, which will assert on invalid value.
WebGLRefPtr<WebGLTexture>* currentTexPtr = nullptr;
switch (rawTarget) {
case LOCAL_GL_TEXTURE_2D:
currentTexPtr = &mBound2DTextures[mActiveTexture];
break;
case LOCAL_GL_TEXTURE_CUBE_MAP:
currentTexPtr = &mBoundCubeMapTextures[mActiveTexture];
break;
case LOCAL_GL_TEXTURE_3D:
if (IsWebGL2())
currentTexPtr = &mBound3DTextures[mActiveTexture];
break;
case LOCAL_GL_TEXTURE_2D_ARRAY:
if (IsWebGL2())
currentTexPtr = &mBound2DArrayTextures[mActiveTexture];
break;
}
if (!currentTexPtr) {
ErrorInvalidEnumInfo("target", rawTarget);
return;
}
const TexTarget texTarget(rawTarget);
if (newTex) {
if (!newTex->BindTexture(texTarget))
return;
} else {
gl->fBindTexture(texTarget.get(), 0);
}
*currentTexPtr = newTex;
}
bool
WebGLContext::ValidateBlendEquationEnum(GLenum mode, const char* info)
{
switch (mode) {
case LOCAL_GL_FUNC_ADD:
case LOCAL_GL_FUNC_SUBTRACT:
case LOCAL_GL_FUNC_REVERSE_SUBTRACT:
return true;
case LOCAL_GL_MIN:
case LOCAL_GL_MAX:
if (IsWebGL2() ||
IsExtensionEnabled(WebGLExtensionID::EXT_blend_minmax))
{
return true;
}
break;
default:
break;
}
ErrorInvalidEnumInfo(info, mode);
return false;
}
bool
WebGLContext::ValidateFramebufferTarget(GLenum target,
const char* const info)
{
bool isValid = true;
switch (target) {
case LOCAL_GL_FRAMEBUFFER:
break;
case LOCAL_GL_DRAW_FRAMEBUFFER:
case LOCAL_GL_READ_FRAMEBUFFER:
isValid = IsWebGL2();
break;
default:
isValid = false;
break;
}
if (MOZ_LIKELY(isValid)) {
return true;
}
ErrorInvalidEnum("%s: Invalid target: %s (0x%04x).", info, EnumName(target),
target);
return false;
}
WebGLRefPtr<WebGLQuery>* WebGLContext::ValidateQuerySlotByTarget(
GLenum target) {
if (IsWebGL2()) {
switch (target) {
case LOCAL_GL_ANY_SAMPLES_PASSED:
case LOCAL_GL_ANY_SAMPLES_PASSED_CONSERVATIVE:
return &mQuerySlot_SamplesPassed;
case LOCAL_GL_TRANSFORM_FEEDBACK_PRIMITIVES_WRITTEN:
return &mQuerySlot_TFPrimsWritten;
default:
break;
}
}
if (IsExtensionEnabled(WebGLExtensionID::EXT_disjoint_timer_query)) {
switch (target) {
case LOCAL_GL_TIME_ELAPSED_EXT:
return &mQuerySlot_TimeElapsed;
default:
break;
}
}
ErrorInvalidEnumInfo("target", target);
return nullptr;
}
bool
WebGLContext::InitWebGL2()
{
MOZ_ASSERT(IsWebGL2(), "WebGLContext is not a WebGL 2 context!");
// check OpenGL features
if (!gl->IsSupported(gl::GLFeature::occlusion_query) &&
!gl->IsSupported(gl::GLFeature::occlusion_query_boolean))
{
// On desktop, we fake occlusion_query_boolean with occlusion_query if
// necessary. (See WebGL2ContextQueries.cpp)
GenerateWarning("WebGL 2 unavailable. Requires occlusion queries.");
return false;
}
std::vector<gl::GLFeature> missingList;
for (size_t i = 0; i < ArrayLength(kRequiredFeatures); i++) {
if (!gl->IsSupported(kRequiredFeatures[i]))
missingList.push_back(kRequiredFeatures[i]);
}
if (missingList.size()) {
nsAutoCString exts;
for (auto itr = missingList.begin(); itr != missingList.end(); ++itr) {
exts.AppendLiteral("\n ");
exts.Append(gl::GLContext::GetFeatureName(*itr));
}
GenerateWarning("WebGL 2 unavailable. The following required features are"
" unavailible: %s", exts.BeginReading());
return false;
}
// ok WebGL 2 is compatible, we can enable natively supported extensions.
for (size_t i = 0; i < ArrayLength(kNativelySupportedExtensions); i++) {
EnableExtension(kNativelySupportedExtensions[i]);
MOZ_ASSERT(IsExtensionEnabled(kNativelySupportedExtensions[i]));
}
// we initialise WebGL 2 related stuff.
gl->GetUIntegerv(LOCAL_GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS,
&mGLMaxTransformFeedbackSeparateAttribs);
gl->GetUIntegerv(LOCAL_GL_MAX_UNIFORM_BUFFER_BINDINGS,
&mGLMaxUniformBufferBindings);
mBoundTransformFeedbackBuffers.SetLength(mGLMaxTransformFeedbackSeparateAttribs);
mBoundUniformBuffers.SetLength(mGLMaxUniformBufferBindings);
mDefaultTransformFeedback = new WebGLTransformFeedback(this, 0);
mBoundTransformFeedback = mDefaultTransformFeedback;
mBypassShaderValidation = true;
return true;
}
void
WebGLContext::DeleteBuffer(WebGLBuffer* buffer)
{
if (IsContextLost())
return;
if (!ValidateObjectAllowDeletedOrNull("deleteBuffer", buffer))
return;
if (!buffer || buffer->IsDeleted())
return;
////
const auto fnClearIfBuffer = [&](WebGLRefPtr<WebGLBuffer>& bindPoint) {
if (bindPoint == buffer) {
bindPoint = nullptr;
}
};
fnClearIfBuffer(mBoundArrayBuffer);
fnClearIfBuffer(mBoundVertexArray->mElementArrayBuffer);
// WebGL binding points
if (IsWebGL2()) {
fnClearIfBuffer(mBoundCopyReadBuffer);
fnClearIfBuffer(mBoundCopyWriteBuffer);
fnClearIfBuffer(mBoundPixelPackBuffer);
fnClearIfBuffer(mBoundPixelUnpackBuffer);
fnClearIfBuffer(mBoundUniformBuffer);
fnClearIfBuffer(mBoundTransformFeedback->mGenericBufferBinding);
if (!mBoundTransformFeedback->mIsActive) {
for (auto& binding : mBoundTransformFeedback->mIndexedBindings) {
fnClearIfBuffer(binding.mBufferBinding);
}
}
for (auto& binding : mIndexedUniformBufferBindings) {
fnClearIfBuffer(binding.mBufferBinding);
}
}
for (int32_t i = 0; i < mGLMaxVertexAttribs; i++) {
if (mBoundVertexArray->HasAttrib(i)) {
fnClearIfBuffer(mBoundVertexArray->mAttribs[i].mBuf);
}
}
////
buffer->RequestDelete();
}
void WebGLContext::AssertCachedBindings() const {
#ifdef DEBUG
gl::GLContext::LocalErrorScope errorScope(*gl);
if (IsWebGL2() ||
IsExtensionEnabled(WebGLExtensionID::OES_vertex_array_object)) {
AssertUintParamCorrect(gl, LOCAL_GL_VERTEX_ARRAY_BINDING,
mBoundVertexArray->mGLName);
}
GLint stencilBits = 0;
if (GetStencilBits(&stencilBits)) { // Depends on current draw framebuffer.
const GLuint stencilRefMask = (1 << stencilBits) - 1;
AssertMaskedUintParamCorrect(gl, LOCAL_GL_STENCIL_REF, stencilRefMask,
mStencilRefFront);
AssertMaskedUintParamCorrect(gl, LOCAL_GL_STENCIL_BACK_REF, stencilRefMask,
mStencilRefBack);
}
// Program
GLuint bound = mCurrentProgram ? mCurrentProgram->mGLName : 0;
AssertUintParamCorrect(gl, LOCAL_GL_CURRENT_PROGRAM, bound);
// Textures
GLenum activeTexture = mActiveTexture + LOCAL_GL_TEXTURE0;
AssertUintParamCorrect(gl, LOCAL_GL_ACTIVE_TEXTURE, activeTexture);
WebGLTexture* curTex = ActiveBoundTextureForTarget(LOCAL_GL_TEXTURE_2D);
bound = curTex ? curTex->mGLName : 0;
AssertUintParamCorrect(gl, LOCAL_GL_TEXTURE_BINDING_2D, bound);
curTex = ActiveBoundTextureForTarget(LOCAL_GL_TEXTURE_CUBE_MAP);
bound = curTex ? curTex->mGLName : 0;
AssertUintParamCorrect(gl, LOCAL_GL_TEXTURE_BINDING_CUBE_MAP, bound);
// Buffers
bound = mBoundArrayBuffer ? mBoundArrayBuffer->mGLName : 0;
AssertUintParamCorrect(gl, LOCAL_GL_ARRAY_BUFFER_BINDING, bound);
MOZ_ASSERT(mBoundVertexArray);
WebGLBuffer* curBuff = mBoundVertexArray->mElementArrayBuffer;
bound = curBuff ? curBuff->mGLName : 0;
AssertUintParamCorrect(gl, LOCAL_GL_ELEMENT_ARRAY_BUFFER_BINDING, bound);
MOZ_ASSERT(!gl::GLContext::IsBadCallError(errorScope.GetError()));
#endif
// We do not check the renderbuffer binding, because we never rely on it
// matching.
}
WebGLRefPtr<WebGLBuffer>*
WebGLContext::ValidateBufferSlot(const char* funcName, GLenum target)
{
WebGLRefPtr<WebGLBuffer>* slot = nullptr;
switch (target) {
case LOCAL_GL_ARRAY_BUFFER:
slot = &mBoundArrayBuffer;
break;
case LOCAL_GL_ELEMENT_ARRAY_BUFFER:
slot = &(mBoundVertexArray->mElementArrayBuffer);
break;
}
if (IsWebGL2()) {
switch (target) {
case LOCAL_GL_COPY_READ_BUFFER:
slot = &mBoundCopyReadBuffer;
break;
case LOCAL_GL_COPY_WRITE_BUFFER:
slot = &mBoundCopyWriteBuffer;
break;
case LOCAL_GL_PIXEL_PACK_BUFFER:
slot = &mBoundPixelPackBuffer;
break;
case LOCAL_GL_PIXEL_UNPACK_BUFFER:
slot = &mBoundPixelUnpackBuffer;
break;
case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER:
slot = &(mBoundTransformFeedback->mGenericBufferBinding);
break;
case LOCAL_GL_UNIFORM_BUFFER:
slot = &mBoundUniformBuffer;
break;
}
}
if (!slot) {
ErrorInvalidEnum("%s: Bad `target`: 0x%04x", funcName, target);
return nullptr;
}
return slot;
}
bool
WebGLContext::DrawArrays_check(const char* funcName, GLenum mode, GLint first,
GLsizei vertCount, GLsizei instanceCount)
{
if (!ValidateDrawModeEnum(mode, funcName))
return false;
if (!ValidateNonNegative(funcName, "first", first) ||
!ValidateNonNegative(funcName, "vertCount", vertCount) ||
!ValidateNonNegative(funcName, "instanceCount", instanceCount))
{
return false;
}
if (!ValidateStencilParamsForDrawCall())
return false;
if (IsWebGL2() && !gl->IsSupported(gl::GLFeature::prim_restart_fixed)) {
MOZ_ASSERT(gl->IsSupported(gl::GLFeature::prim_restart));
if (mPrimRestartTypeBytes != 0) {
mPrimRestartTypeBytes = 0;
// OSX appears to have severe perf issues with leaving this enabled.
gl->fDisable(LOCAL_GL_PRIMITIVE_RESTART);
}
}
if (!vertCount || !instanceCount)
return false; // No error, just early out.
if (!ValidateBufferFetching(funcName))
return false;
const auto checked_firstPlusCount = CheckedInt<GLsizei>(first) + vertCount;
if (!checked_firstPlusCount.isValid()) {
ErrorInvalidOperation("%s: overflow in first+vertCount", funcName);
return false;
}
if (uint32_t(checked_firstPlusCount.value()) > mMaxFetchedVertices) {
ErrorInvalidOperation("%s: Bound vertex attribute buffers do not have sufficient"
" size for given first and count.",
funcName);
return false;
}
return true;
}
void WebGLContext::DeleteBuffer(WebGLBuffer* buffer) {
const FuncScope funcScope(*this, "deleteBuffer");
if (!ValidateDeleteObject(buffer)) return;
////
const auto fnClearIfBuffer = [&](GLenum target,
WebGLRefPtr<WebGLBuffer>& bindPoint) {
if (bindPoint == buffer) {
WebGLBuffer::SetSlot(target, nullptr, &bindPoint);
}
};
fnClearIfBuffer(0, mBoundArrayBuffer);
fnClearIfBuffer(0, mBoundVertexArray->mElementArrayBuffer);
for (auto& cur : mBoundVertexArray->mAttribs) {
fnClearIfBuffer(0, cur.mBuf);
}
// WebGL binding points
if (IsWebGL2()) {
fnClearIfBuffer(0, mBoundCopyReadBuffer);
fnClearIfBuffer(0, mBoundCopyWriteBuffer);
fnClearIfBuffer(0, mBoundPixelPackBuffer);
fnClearIfBuffer(0, mBoundPixelUnpackBuffer);
fnClearIfBuffer(0, mBoundUniformBuffer);
fnClearIfBuffer(LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER,
mBoundTransformFeedbackBuffer);
if (!mBoundTransformFeedback->mIsActive) {
for (auto& binding : mBoundTransformFeedback->mIndexedBindings) {
fnClearIfBuffer(LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER,
binding.mBufferBinding);
}
}
for (auto& binding : mIndexedUniformBufferBindings) {
fnClearIfBuffer(0, binding.mBufferBinding);
}
}
////
buffer->RequestDelete();
}
void
WebGLContext::BindTexture(GLenum rawTarget, WebGLTexture* newTex)
{
if (IsContextLost())
return;
if (!ValidateObjectAllowDeletedOrNull("bindTexture", newTex))
return;
// Need to check rawTarget first before comparing against newTex->Target() as
// newTex->Target() returns a TexTarget, which will assert on invalid value.
WebGLRefPtr<WebGLTexture>* currentTexPtr = nullptr;
switch (rawTarget) {
case LOCAL_GL_TEXTURE_2D:
currentTexPtr = &mBound2DTextures[mActiveTexture];
break;
case LOCAL_GL_TEXTURE_CUBE_MAP:
currentTexPtr = &mBoundCubeMapTextures[mActiveTexture];
break;
case LOCAL_GL_TEXTURE_3D:
if (!IsWebGL2())
return ErrorInvalidEnum("bindTexture: target TEXTURE_3D is only available in WebGL version 2.0 or newer");
currentTexPtr = &mBound3DTextures[mActiveTexture];
break;
default:
return ErrorInvalidEnumInfo("bindTexture: target", rawTarget);
}
const TexTarget texTarget(rawTarget);
MakeContextCurrent();
if (newTex && !newTex->BindTexture(texTarget))
return;
if (!newTex) {
gl->fBindTexture(texTarget.get(), 0);
}
*currentTexPtr = newTex;
}
bool
WebGLContext::DrawInstanced_check(const char* info)
{
MOZ_ASSERT(IsWebGL2() ||
IsExtensionEnabled(WebGLExtensionID::ANGLE_instanced_arrays));
if (!mBufferFetchingHasPerVertex) {
/* http://www.khronos.org/registry/gles/extensions/ANGLE/ANGLE_instanced_arrays.txt
* If all of the enabled vertex attribute arrays that are bound to active
* generic attributes in the program have a non-zero divisor, the draw
* call should return INVALID_OPERATION.
*
* NB: This also appears to apply to NV_instanced_arrays, though the
* INVALID_OPERATION emission is not explicitly stated.
* ARB_instanced_arrays does not have this restriction.
*/
ErrorInvalidOperation("%s: at least one vertex attribute divisor should be 0", info);
return false;
}
return true;
}
bool
WebGLContext::ValidateCapabilityEnum(GLenum cap, const char* info)
{
switch (cap) {
case LOCAL_GL_BLEND:
case LOCAL_GL_CULL_FACE:
case LOCAL_GL_DEPTH_TEST:
case LOCAL_GL_DITHER:
case LOCAL_GL_POLYGON_OFFSET_FILL:
case LOCAL_GL_SAMPLE_ALPHA_TO_COVERAGE:
case LOCAL_GL_SAMPLE_COVERAGE:
case LOCAL_GL_SCISSOR_TEST:
case LOCAL_GL_STENCIL_TEST:
return true;
case LOCAL_GL_RASTERIZER_DISCARD:
return IsWebGL2();
default:
ErrorInvalidEnumInfo(info, cap);
return false;
}
}
bool
WebGLContext::ValidateTextureTargetEnum(GLenum target, const char* info)
{
switch (target) {
case LOCAL_GL_TEXTURE_2D:
case LOCAL_GL_TEXTURE_CUBE_MAP:
return true;
case LOCAL_GL_TEXTURE_3D:
if (IsWebGL2())
return true;
break;
default:
break;
}
ErrorInvalidEnumInfo(info, target);
return false;
}
void
WebGLContext::DeleteBuffer(WebGLBuffer* buffer)
{
if (IsContextLost())
return;
if (!ValidateObjectAllowDeletedOrNull("deleteBuffer", buffer))
return;
if (!buffer || buffer->IsDeleted())
return;
// TODO: Extract this into a helper function?
if (mBoundArrayBuffer == buffer) {
WebGLContextUnchecked::BindBuffer(LOCAL_GL_ARRAY_BUFFER, nullptr);
mBoundArrayBuffer = nullptr;
}
if (mBoundVertexArray->mElementArrayBuffer == buffer) {
WebGLContextUnchecked::BindBuffer(LOCAL_GL_ELEMENT_ARRAY_BUFFER, nullptr);
mBoundVertexArray->mElementArrayBuffer = nullptr;
}
// WebGL binding points
if (IsWebGL2()) {
if (mBoundCopyReadBuffer == buffer)
mBoundCopyReadBuffer = nullptr;
if (mBoundCopyWriteBuffer == buffer)
mBoundCopyWriteBuffer = nullptr;
if (mBoundPixelPackBuffer == buffer)
mBoundPixelPackBuffer = nullptr;
if (mBoundPixelUnpackBuffer == buffer)
mBoundPixelUnpackBuffer = nullptr;
if (mBoundTransformFeedbackBuffer == buffer)
mBoundTransformFeedbackBuffer = nullptr;
if (mBoundUniformBuffer == buffer)
mBoundUniformBuffer = nullptr;
const size_t xfBufferCount = mBoundTransformFeedbackBuffers.Length();
for (size_t n = 0; n < xfBufferCount; n++) {
if (mBoundTransformFeedbackBuffers[n] == buffer) {
mBoundTransformFeedbackBuffers[n] = nullptr;
}
}
const size_t uniformBufferCount = mBoundUniformBuffers.Length();
for (size_t n = 0; n < uniformBufferCount; n++) {
if (mBoundUniformBuffers[n] == buffer) {
mBoundUniformBuffers[n] = nullptr;
}
}
}
for (int32_t i = 0; i < mGLMaxVertexAttribs; i++) {
if (mBoundVertexArray->HasAttrib(i) &&
mBoundVertexArray->mAttribs[i].buf == buffer)
{
mBoundVertexArray->mAttribs[i].buf = nullptr;
}
}
buffer->RequestDelete();
}
void WebGLContext::AssertCachedGlobalState() const {
#ifdef DEBUG
gl::GLContext::LocalErrorScope errorScope(*gl);
////////////////
// Draw state
MOZ_ASSERT(gl->fIsEnabled(LOCAL_GL_DITHER) == mDitherEnabled);
MOZ_ASSERT_IF(IsWebGL2(), gl->fIsEnabled(LOCAL_GL_RASTERIZER_DISCARD) ==
mRasterizerDiscardEnabled);
MOZ_ASSERT(gl->fIsEnabled(LOCAL_GL_SCISSOR_TEST) == mScissorTestEnabled);
// Cannot trivially check COLOR_CLEAR_VALUE, since in old GL versions glGet
// may clamp based on whether the current framebuffer is floating-point or
// not. This also means COLOR_CLEAR_VALUE save+restore is dangerous!
realGLboolean depthWriteMask = 0;
gl->fGetBooleanv(LOCAL_GL_DEPTH_WRITEMASK, &depthWriteMask);
MOZ_ASSERT(depthWriteMask == mDepthWriteMask);
GLfloat depthClearValue = 0.0f;
gl->fGetFloatv(LOCAL_GL_DEPTH_CLEAR_VALUE, &depthClearValue);
MOZ_ASSERT(IsCacheCorrect(mDepthClearValue, depthClearValue));
const int maxStencilBits = 8;
const GLuint maxStencilBitsMask = (1 << maxStencilBits) - 1;
AssertMaskedUintParamCorrect(gl, LOCAL_GL_STENCIL_CLEAR_VALUE,
maxStencilBitsMask, mStencilClearValue);
// GLES 3.0.4, $4.1.4, p177:
// [...] the front and back stencil mask are both set to the value `2^s -
// 1`, where `s` is greater than or equal to the number of bits in the
// deepest stencil buffer supported by the GL implementation.
AssertMaskedUintParamCorrect(gl, LOCAL_GL_STENCIL_VALUE_MASK,
maxStencilBitsMask, mStencilValueMaskFront);
AssertMaskedUintParamCorrect(gl, LOCAL_GL_STENCIL_BACK_VALUE_MASK,
maxStencilBitsMask, mStencilValueMaskBack);
AssertMaskedUintParamCorrect(gl, LOCAL_GL_STENCIL_WRITEMASK,
maxStencilBitsMask, mStencilWriteMaskFront);
AssertMaskedUintParamCorrect(gl, LOCAL_GL_STENCIL_BACK_WRITEMASK,
maxStencilBitsMask, mStencilWriteMaskBack);
// Viewport
GLint int4[4] = {0, 0, 0, 0};
gl->fGetIntegerv(LOCAL_GL_VIEWPORT, int4);
MOZ_ASSERT(int4[0] == mViewportX && int4[1] == mViewportY &&
int4[2] == mViewportWidth && int4[3] == mViewportHeight);
AssertUintParamCorrect(gl, LOCAL_GL_PACK_ALIGNMENT,
mPixelStore_PackAlignment);
AssertUintParamCorrect(gl, LOCAL_GL_UNPACK_ALIGNMENT,
mPixelStore_UnpackAlignment);
if (IsWebGL2()) {
AssertUintParamCorrect(gl, LOCAL_GL_UNPACK_IMAGE_HEIGHT,
mPixelStore_UnpackImageHeight);
AssertUintParamCorrect(gl, LOCAL_GL_UNPACK_SKIP_IMAGES,
mPixelStore_UnpackSkipImages);
AssertUintParamCorrect(gl, LOCAL_GL_UNPACK_ROW_LENGTH,
mPixelStore_UnpackRowLength);
AssertUintParamCorrect(gl, LOCAL_GL_UNPACK_SKIP_ROWS,
mPixelStore_UnpackSkipRows);
AssertUintParamCorrect(gl, LOCAL_GL_UNPACK_SKIP_PIXELS,
mPixelStore_UnpackSkipPixels);
AssertUintParamCorrect(gl, LOCAL_GL_PACK_ROW_LENGTH,
mPixelStore_PackRowLength);
AssertUintParamCorrect(gl, LOCAL_GL_PACK_SKIP_ROWS,
mPixelStore_PackSkipRows);
AssertUintParamCorrect(gl, LOCAL_GL_PACK_SKIP_PIXELS,
mPixelStore_PackSkipPixels);
}
MOZ_ASSERT(!gl::GLContext::IsBadCallError(errorScope.GetError()));
#endif
}
JS::Value
WebGLContext::GetParameter(JSContext* cx, GLenum pname, ErrorResult& rv)
{
if (IsContextLost())
return JS::NullValue();
MakeContextCurrent();
if (MinCapabilityMode()) {
switch(pname) {
////////////////////////////
// Single-value params
// int
case LOCAL_GL_MAX_VERTEX_ATTRIBS:
return JS::Int32Value(MINVALUE_GL_MAX_VERTEX_ATTRIBS);
case LOCAL_GL_MAX_FRAGMENT_UNIFORM_VECTORS:
return JS::Int32Value(MINVALUE_GL_MAX_FRAGMENT_UNIFORM_VECTORS);
case LOCAL_GL_MAX_VERTEX_UNIFORM_VECTORS:
return JS::Int32Value(MINVALUE_GL_MAX_VERTEX_UNIFORM_VECTORS);
case LOCAL_GL_MAX_VARYING_VECTORS:
return JS::Int32Value(MINVALUE_GL_MAX_VARYING_VECTORS);
case LOCAL_GL_MAX_TEXTURE_SIZE:
return JS::Int32Value(MINVALUE_GL_MAX_TEXTURE_SIZE);
case LOCAL_GL_MAX_CUBE_MAP_TEXTURE_SIZE:
return JS::Int32Value(MINVALUE_GL_MAX_CUBE_MAP_TEXTURE_SIZE);
case LOCAL_GL_MAX_TEXTURE_IMAGE_UNITS:
return JS::Int32Value(MINVALUE_GL_MAX_TEXTURE_IMAGE_UNITS);
case LOCAL_GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:
return JS::Int32Value(MINVALUE_GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS);
case LOCAL_GL_MAX_RENDERBUFFER_SIZE:
return JS::Int32Value(MINVALUE_GL_MAX_RENDERBUFFER_SIZE);
default:
// Return the real value; we're not overriding this one
break;
}
}
if (IsWebGL2() || IsExtensionEnabled(WebGLExtensionID::WEBGL_draw_buffers)) {
if (pname == LOCAL_GL_MAX_COLOR_ATTACHMENTS) {
return JS::Int32Value(mImplMaxColorAttachments);
} else if (pname == LOCAL_GL_MAX_DRAW_BUFFERS) {
return JS::Int32Value(mImplMaxDrawBuffers);
} else if (pname >= LOCAL_GL_DRAW_BUFFER0 &&
pname < GLenum(LOCAL_GL_DRAW_BUFFER0 + mImplMaxDrawBuffers))
{
GLint iv = 0;
gl->fGetIntegerv(pname, &iv);
if (mBoundDrawFramebuffer)
return JS::Int32Value(iv);
const GLint index = (pname - LOCAL_GL_DRAW_BUFFER0);
if (iv == LOCAL_GL_COLOR_ATTACHMENT0 + index)
return JS::Int32Value(LOCAL_GL_BACK);
return JS::Int32Value(LOCAL_GL_NONE);
}
}
if (IsWebGL2() || IsExtensionEnabled(WebGLExtensionID::OES_vertex_array_object)) {
if (pname == LOCAL_GL_VERTEX_ARRAY_BINDING) {
WebGLVertexArray* vao =
(mBoundVertexArray != mDefaultVertexArray) ? mBoundVertexArray.get() : nullptr;
return WebGLObjectAsJSValue(cx, vao, rv);
}
}
if (IsWebGL2() || IsExtensionEnabled(WebGLExtensionID::EXT_disjoint_timer_query)) {
if (pname == LOCAL_GL_TIMESTAMP_EXT) {
GLuint64 iv = 0;
gl->fGetInteger64v(pname, (GLint64*) &iv);
// TODO: JS doesn't support 64-bit integers. Be lossy and
// cast to double (53 bits)
return JS::NumberValue(static_cast<double>(iv));
} else if (pname == LOCAL_GL_GPU_DISJOINT_EXT) {
// When disjoint isn't supported, leave as false.
realGLboolean disjoint = LOCAL_GL_FALSE;
if (gl->IsExtensionSupported(gl::GLContext::EXT_disjoint_timer_query)) {
gl->fGetBooleanv(pname, &disjoint);
}
return JS::BooleanValue(bool(disjoint));
}
}
// Privileged string params exposed by WEBGL_debug_renderer_info.
// The privilege check is done in WebGLContext::IsExtensionSupported.
// So here we just have to check that the extension is enabled.
if (IsExtensionEnabled(WebGLExtensionID::WEBGL_debug_renderer_info)) {
switch (pname) {
case UNMASKED_VENDOR_WEBGL:
case UNMASKED_RENDERER_WEBGL:
{
const char* overridePref = nullptr;
GLenum driverEnum = LOCAL_GL_NONE;
switch (pname) {
case UNMASKED_RENDERER_WEBGL:
overridePref = "webgl.renderer-string-override";
driverEnum = LOCAL_GL_RENDERER;
break;
case UNMASKED_VENDOR_WEBGL:
overridePref = "webgl.vendor-string-override";
driverEnum = LOCAL_GL_VENDOR;
break;
default:
MOZ_CRASH("bad `pname`");
}
bool hasRetVal = false;
nsAutoString ret;
if (overridePref) {
nsresult res = Preferences::GetString(overridePref, &ret);
if (NS_SUCCEEDED(res) && ret.Length() > 0)
hasRetVal = true;
}
if (!hasRetVal) {
const char* chars = reinterpret_cast<const char*>(gl->fGetString(driverEnum));
ret = NS_ConvertASCIItoUTF16(chars);
hasRetVal = true;
}
return StringValue(cx, ret, rv);
}
}
}
if (IsWebGL2() || IsExtensionEnabled(WebGLExtensionID::OES_standard_derivatives)) {
if (pname == LOCAL_GL_FRAGMENT_SHADER_DERIVATIVE_HINT) {
GLint i = 0;
gl->fGetIntegerv(pname, &i);
return JS::Int32Value(i);
}
}
if (IsExtensionEnabled(WebGLExtensionID::EXT_texture_filter_anisotropic)) {
if (pname == LOCAL_GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT) {
GLfloat f = 0.f;
gl->fGetFloatv(pname, &f);
return JS::NumberValue(f);
}
}
switch (pname) {
//
// String params
//
case LOCAL_GL_VENDOR:
case LOCAL_GL_RENDERER:
return StringValue(cx, "Mozilla", rv);
case LOCAL_GL_VERSION:
return StringValue(cx, "WebGL 1.0", rv);
case LOCAL_GL_SHADING_LANGUAGE_VERSION:
return StringValue(cx, "WebGL GLSL ES 1.0", rv);
////////////////////////////////
// Single-value params
// unsigned int
case LOCAL_GL_CULL_FACE_MODE:
case LOCAL_GL_FRONT_FACE:
case LOCAL_GL_ACTIVE_TEXTURE:
case LOCAL_GL_STENCIL_FUNC:
case LOCAL_GL_STENCIL_FAIL:
case LOCAL_GL_STENCIL_PASS_DEPTH_FAIL:
case LOCAL_GL_STENCIL_PASS_DEPTH_PASS:
case LOCAL_GL_STENCIL_BACK_FUNC:
case LOCAL_GL_STENCIL_BACK_FAIL:
case LOCAL_GL_STENCIL_BACK_PASS_DEPTH_FAIL:
case LOCAL_GL_STENCIL_BACK_PASS_DEPTH_PASS:
case LOCAL_GL_DEPTH_FUNC:
case LOCAL_GL_BLEND_SRC_RGB:
case LOCAL_GL_BLEND_SRC_ALPHA:
case LOCAL_GL_BLEND_DST_RGB:
case LOCAL_GL_BLEND_DST_ALPHA:
case LOCAL_GL_BLEND_EQUATION_RGB:
case LOCAL_GL_BLEND_EQUATION_ALPHA:
case LOCAL_GL_GENERATE_MIPMAP_HINT: {
GLint i = 0;
gl->fGetIntegerv(pname, &i);
return JS::NumberValue(uint32_t(i));
}
case LOCAL_GL_IMPLEMENTATION_COLOR_READ_TYPE: {
if (mBoundReadFramebuffer) {
nsCString fbStatusInfoIgnored;
const auto status = mBoundReadFramebuffer->CheckFramebufferStatus(&fbStatusInfoIgnored);
if (status != LOCAL_GL_FRAMEBUFFER_COMPLETE) {
ErrorInvalidOperation("getParameter: Read framebuffer must be"
" complete before querying"
" IMPLEMENTATION_COLOR_READ_TYPE.");
return JS::NullValue();
}
}
GLint i = 0;
if (gl->IsSupported(gl::GLFeature::ES2_compatibility)) {
gl->fGetIntegerv(pname, &i);
} else {
i = LOCAL_GL_UNSIGNED_BYTE;
}
return JS::NumberValue(uint32_t(i));
}
case LOCAL_GL_IMPLEMENTATION_COLOR_READ_FORMAT: {
if (mBoundReadFramebuffer) {
nsCString fbStatusInfoIgnored;
const auto status = mBoundReadFramebuffer->CheckFramebufferStatus(&fbStatusInfoIgnored);
if (status != LOCAL_GL_FRAMEBUFFER_COMPLETE) {
ErrorInvalidOperation("getParameter: Read framebuffer must be"
" complete before querying"
" IMPLEMENTATION_COLOR_READ_FORMAT.");
return JS::NullValue();
}
}
GLint i = 0;
if (gl->IsSupported(gl::GLFeature::ES2_compatibility)) {
gl->fGetIntegerv(pname, &i);
} else {
i = LOCAL_GL_RGBA;
}
// OpenGL ES 3.0.4 p112 Table 3.2 shows that read format SRGB_ALPHA is
// not supported. And if internal format of fbo is SRGB8_ALPHA8, then
// IMPLEMENTATION_COLOR_READ_FORMAT is SRGB_ALPHA which is not supported
// by ReadPixels. So, just return RGBA here.
if (i == LOCAL_GL_SRGB_ALPHA)
i = LOCAL_GL_RGBA;
return JS::NumberValue(uint32_t(i));
}
// int
case LOCAL_GL_STENCIL_REF:
case LOCAL_GL_STENCIL_BACK_REF: {
GLint stencilBits = 0;
if (!GetStencilBits(&stencilBits))
return JS::NullValue();
// Assuming stencils have 8 bits
const GLint stencilMask = (1 << stencilBits) - 1;
GLint refValue = 0;
gl->fGetIntegerv(pname, &refValue);
return JS::Int32Value(refValue & stencilMask);
}
case LOCAL_GL_STENCIL_BITS: {
GLint stencilBits = 0;
GetStencilBits(&stencilBits);
return JS::Int32Value(stencilBits);
}
case LOCAL_GL_STENCIL_CLEAR_VALUE:
case LOCAL_GL_UNPACK_ALIGNMENT:
case LOCAL_GL_PACK_ALIGNMENT:
case LOCAL_GL_SUBPIXEL_BITS:
case LOCAL_GL_SAMPLE_BUFFERS:
case LOCAL_GL_SAMPLES:
case LOCAL_GL_MAX_VERTEX_ATTRIBS:
case LOCAL_GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS:
case LOCAL_GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:
case LOCAL_GL_MAX_TEXTURE_IMAGE_UNITS:
case LOCAL_GL_RED_BITS:
case LOCAL_GL_GREEN_BITS:
case LOCAL_GL_BLUE_BITS: {
GLint i = 0;
gl->fGetIntegerv(pname, &i);
return JS::Int32Value(i);
}
case LOCAL_GL_DEPTH_BITS: {
GLint i = 0;
if (!mNeedsFakeNoDepth) {
gl->fGetIntegerv(pname, &i);
}
return JS::Int32Value(i);
}
case LOCAL_GL_ALPHA_BITS: {
GLint i = 0;
if (!mNeedsFakeNoAlpha) {
gl->fGetIntegerv(pname, &i);
}
return JS::Int32Value(i);
}
case LOCAL_GL_MAX_TEXTURE_SIZE:
return JS::Int32Value(mImplMaxTextureSize);
case LOCAL_GL_MAX_CUBE_MAP_TEXTURE_SIZE:
return JS::Int32Value(mImplMaxCubeMapTextureSize);
case LOCAL_GL_MAX_RENDERBUFFER_SIZE:
return JS::Int32Value(mImplMaxRenderbufferSize);
case LOCAL_GL_MAX_VERTEX_UNIFORM_VECTORS:
return JS::Int32Value(mGLMaxVertexUniformVectors);
case LOCAL_GL_MAX_FRAGMENT_UNIFORM_VECTORS:
return JS::Int32Value(mGLMaxFragmentUniformVectors);
case LOCAL_GL_MAX_VARYING_VECTORS:
return JS::Int32Value(mGLMaxVaryingVectors);
case LOCAL_GL_COMPRESSED_TEXTURE_FORMATS: {
uint32_t length = mCompressedTextureFormats.Length();
JSObject* obj = dom::Uint32Array::Create(cx, this, length,
mCompressedTextureFormats.Elements());
if (!obj) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
return JS::ObjectOrNullValue(obj);
}
// unsigned int. here we may have to return very large values like 2^32-1 that can't be represented as
// javascript integer values. We just return them as doubles and javascript doesn't care.
case LOCAL_GL_STENCIL_BACK_VALUE_MASK:
return JS::DoubleValue(mStencilValueMaskBack); // pass as FP value to allow large values such as 2^32-1.
case LOCAL_GL_STENCIL_BACK_WRITEMASK:
return JS::DoubleValue(mStencilWriteMaskBack);
case LOCAL_GL_STENCIL_VALUE_MASK:
return JS::DoubleValue(mStencilValueMaskFront);
case LOCAL_GL_STENCIL_WRITEMASK:
return JS::DoubleValue(mStencilWriteMaskFront);
// float
case LOCAL_GL_DEPTH_CLEAR_VALUE:
case LOCAL_GL_LINE_WIDTH:
case LOCAL_GL_POLYGON_OFFSET_FACTOR:
case LOCAL_GL_POLYGON_OFFSET_UNITS:
case LOCAL_GL_SAMPLE_COVERAGE_VALUE: {
GLfloat f = 0.f;
gl->fGetFloatv(pname, &f);
return JS::DoubleValue(f);
}
// bool
case LOCAL_GL_BLEND:
case LOCAL_GL_DEPTH_TEST:
case LOCAL_GL_STENCIL_TEST:
case LOCAL_GL_CULL_FACE:
case LOCAL_GL_DITHER:
case LOCAL_GL_POLYGON_OFFSET_FILL:
case LOCAL_GL_SCISSOR_TEST:
case LOCAL_GL_SAMPLE_COVERAGE_INVERT:
case LOCAL_GL_DEPTH_WRITEMASK: {
realGLboolean b = 0;
gl->fGetBooleanv(pname, &b);
return JS::BooleanValue(bool(b));
}
// bool, WebGL-specific
case UNPACK_FLIP_Y_WEBGL:
return JS::BooleanValue(mPixelStore_FlipY);
case UNPACK_PREMULTIPLY_ALPHA_WEBGL:
return JS::BooleanValue(mPixelStore_PremultiplyAlpha);
// uint, WebGL-specific
case UNPACK_COLORSPACE_CONVERSION_WEBGL:
return JS::NumberValue(uint32_t(mPixelStore_ColorspaceConversion));
////////////////////////////////
// Complex values
// 2 floats
case LOCAL_GL_DEPTH_RANGE:
case LOCAL_GL_ALIASED_POINT_SIZE_RANGE:
case LOCAL_GL_ALIASED_LINE_WIDTH_RANGE: {
GLfloat fv[2] = { 0 };
gl->fGetFloatv(pname, fv);
JSObject* obj = dom::Float32Array::Create(cx, this, 2, fv);
if (!obj) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
return JS::ObjectOrNullValue(obj);
}
// 4 floats
case LOCAL_GL_COLOR_CLEAR_VALUE:
case LOCAL_GL_BLEND_COLOR: {
GLfloat fv[4] = { 0 };
gl->fGetFloatv(pname, fv);
JSObject* obj = dom::Float32Array::Create(cx, this, 4, fv);
if (!obj) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
return JS::ObjectOrNullValue(obj);
}
// 2 ints
case LOCAL_GL_MAX_VIEWPORT_DIMS: {
GLint iv[2] = { 0 };
gl->fGetIntegerv(pname, iv);
JSObject* obj = dom::Int32Array::Create(cx, this, 2, iv);
if (!obj) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
return JS::ObjectOrNullValue(obj);
}
// 4 ints
case LOCAL_GL_SCISSOR_BOX:
case LOCAL_GL_VIEWPORT: {
GLint iv[4] = { 0 };
gl->fGetIntegerv(pname, iv);
JSObject* obj = dom::Int32Array::Create(cx, this, 4, iv);
if (!obj) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
return JS::ObjectOrNullValue(obj);
}
// 4 bools
case LOCAL_GL_COLOR_WRITEMASK: {
realGLboolean gl_bv[4] = { 0 };
gl->fGetBooleanv(pname, gl_bv);
bool vals[4] = { bool(gl_bv[0]), bool(gl_bv[1]),
bool(gl_bv[2]), bool(gl_bv[3]) };
JS::Rooted<JS::Value> arr(cx);
if (!dom::ToJSValue(cx, vals, &arr)) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
return arr;
}
case LOCAL_GL_ARRAY_BUFFER_BINDING: {
return WebGLObjectAsJSValue(cx, mBoundArrayBuffer.get(), rv);
}
case LOCAL_GL_ELEMENT_ARRAY_BUFFER_BINDING: {
return WebGLObjectAsJSValue(cx, mBoundVertexArray->mElementArrayBuffer.get(), rv);
}
case LOCAL_GL_RENDERBUFFER_BINDING: {
return WebGLObjectAsJSValue(cx, mBoundRenderbuffer.get(), rv);
}
// DRAW_FRAMEBUFFER_BINDING is the same as FRAMEBUFFER_BINDING.
case LOCAL_GL_FRAMEBUFFER_BINDING: {
return WebGLObjectAsJSValue(cx, mBoundDrawFramebuffer.get(), rv);
}
case LOCAL_GL_CURRENT_PROGRAM: {
return WebGLObjectAsJSValue(cx, mCurrentProgram.get(), rv);
}
case LOCAL_GL_TEXTURE_BINDING_2D: {
return WebGLObjectAsJSValue(cx, mBound2DTextures[mActiveTexture].get(), rv);
}
case LOCAL_GL_TEXTURE_BINDING_CUBE_MAP: {
return WebGLObjectAsJSValue(cx, mBoundCubeMapTextures[mActiveTexture].get(), rv);
}
default:
break;
}
ErrorInvalidEnumInfo("getParameter: parameter", pname);
return JS::NullValue();
}
void
WebGLContext::VertexAttribAnyPointer(const char* funcName, bool isFuncInt, GLuint index,
GLint size, GLenum type, bool normalized,
GLsizei stride, WebGLintptr byteOffset)
{
if (IsContextLost())
return;
if (!ValidateAttribIndex(index, funcName))
return;
////
if (size < 1 || size > 4) {
ErrorInvalidValue("%s: invalid element size", funcName);
return;
}
// see WebGL spec section 6.6 "Vertex Attribute Data Stride"
if (stride < 0 || stride > 255) {
ErrorInvalidValue("%s: negative or too large stride", funcName);
return;
}
if (byteOffset < 0) {
ErrorInvalidValue("%s: negative offset", funcName);
return;
}
////
bool isTypeValid = true;
uint8_t typeAlignment;
switch (type) {
// WebGL 1:
case LOCAL_GL_BYTE:
case LOCAL_GL_UNSIGNED_BYTE:
typeAlignment = 1;
break;
case LOCAL_GL_SHORT:
case LOCAL_GL_UNSIGNED_SHORT:
typeAlignment = 2;
break;
case LOCAL_GL_FLOAT:
if (isFuncInt) {
isTypeValid = false;
}
typeAlignment = 4;
break;
// WebGL 2:
case LOCAL_GL_INT:
case LOCAL_GL_UNSIGNED_INT:
if (!IsWebGL2()) {
isTypeValid = false;
}
typeAlignment = 4;
break;
case LOCAL_GL_HALF_FLOAT:
if (isFuncInt || !IsWebGL2()) {
isTypeValid = false;
}
typeAlignment = 2;
break;
case LOCAL_GL_FIXED:
if (isFuncInt || !IsWebGL2()) {
isTypeValid = false;
}
typeAlignment = 4;
break;
case LOCAL_GL_INT_2_10_10_10_REV:
case LOCAL_GL_UNSIGNED_INT_2_10_10_10_REV:
if (isFuncInt || !IsWebGL2()) {
isTypeValid = false;
break;
}
if (size != 4) {
ErrorInvalidOperation("%s: size must be 4 for this type.", funcName);
return;
}
typeAlignment = 4;
break;
default:
isTypeValid = false;
break;
}
if (!isTypeValid) {
ErrorInvalidEnumArg(funcName, "type", type);
return;
}
////
// `alignment` should always be a power of two.
MOZ_ASSERT(IsPowerOfTwo(typeAlignment));
const GLsizei typeAlignmentMask = typeAlignment - 1;
if (stride & typeAlignmentMask ||
byteOffset & typeAlignmentMask)
{
ErrorInvalidOperation("%s: `stride` and `byteOffset` must satisfy the alignment"
" requirement of `type`.",
funcName);
return;
}
////
const auto& buffer = mBoundArrayBuffer;
if (!buffer && byteOffset) {
ErrorInvalidOperation("%s: If ARRAY_BUFFER is null, byteOffset must be zero.",
funcName);
return;
}
////
gl->MakeCurrent();
if (isFuncInt) {
gl->fVertexAttribIPointer(index, size, type, stride,
reinterpret_cast<void*>(byteOffset));
} else {
gl->fVertexAttribPointer(index, size, type, normalized, stride,
reinterpret_cast<void*>(byteOffset));
}
WebGLVertexAttribData& vd = mBoundVertexArray->mAttribs[index];
vd.VertexAttribPointer(isFuncInt, buffer, size, type, normalized, stride, byteOffset);
InvalidateBufferFetching();
}
bool
WebGLContext::DrawElements_check(GLsizei count, GLenum type,
WebGLintptr byteOffset, GLsizei primcount,
const char* info, GLuint* out_upperBound)
{
if (count < 0 || byteOffset < 0) {
ErrorInvalidValue("%s: negative count or offset", info);
return false;
}
if (primcount < 0) {
ErrorInvalidValue("%s: negative primcount", info);
return false;
}
if (!ValidateStencilParamsForDrawCall()) {
return false;
}
// If count is 0, there's nothing to do.
if (count == 0 || primcount == 0)
return false;
uint8_t bytesPerElem = 0;
switch (type) {
case LOCAL_GL_UNSIGNED_BYTE:
bytesPerElem = 1;
break;
case LOCAL_GL_UNSIGNED_SHORT:
bytesPerElem = 2;
break;
case LOCAL_GL_UNSIGNED_INT:
if (IsWebGL2() || IsExtensionEnabled(WebGLExtensionID::OES_element_index_uint)) {
bytesPerElem = 4;
}
break;
}
if (!bytesPerElem) {
ErrorInvalidEnum("%s: Invalid `type`: 0x%04x", info, type);
return false;
}
if (byteOffset % bytesPerElem != 0) {
ErrorInvalidOperation("%s: `byteOffset` must be a multiple of the size of `type`",
info);
return false;
}
const GLsizei first = byteOffset / bytesPerElem;
const CheckedUint32 checked_byteCount = bytesPerElem * CheckedUint32(count);
if (!checked_byteCount.isValid()) {
ErrorInvalidValue("%s: overflow in byteCount", info);
return false;
}
// Any checks below this depend on a program being available.
if (!mCurrentProgram) {
ErrorInvalidOperation("%s: null CURRENT_PROGRAM", info);
return false;
}
if (!mBoundVertexArray->mElementArrayBuffer) {
ErrorInvalidOperation("%s: must have element array buffer binding", info);
return false;
}
WebGLBuffer& elemArrayBuffer = *mBoundVertexArray->mElementArrayBuffer;
if (!elemArrayBuffer.ByteLength()) {
ErrorInvalidOperation("%s: bound element array buffer doesn't have any data", info);
return false;
}
CheckedInt<GLsizei> checked_neededByteCount = checked_byteCount.toChecked<GLsizei>() + byteOffset;
if (!checked_neededByteCount.isValid()) {
ErrorInvalidOperation("%s: overflow in byteOffset+byteCount", info);
return false;
}
if (uint32_t(checked_neededByteCount.value()) > elemArrayBuffer.ByteLength()) {
ErrorInvalidOperation("%s: bound element array buffer is too small for given count and offset", info);
return false;
}
if (!ValidateBufferFetching(info))
return false;
if (!mMaxFetchedVertices ||
!elemArrayBuffer.Validate(type, mMaxFetchedVertices - 1, first, count, out_upperBound))
{
ErrorInvalidOperation(
"%s: bound vertex attribute buffers do not have sufficient "
"size for given indices from the bound element array", info);
return false;
}
if (uint32_t(primcount) > mMaxFetchedInstances) {
ErrorInvalidOperation("%s: bound instance attribute buffers do not have sufficient size for given primcount", info);
return false;
}
// Bug 1008310 - Check if buffer has been used with a different previous type
if (elemArrayBuffer.IsElementArrayUsedWithMultipleTypes()) {
GenerateWarning("%s: bound element array buffer previously used with a type other than "
"%s, this will affect performance.",
info,
WebGLContext::EnumName(type));
}
MOZ_ASSERT(gl->IsCurrent());
if (mBoundDrawFramebuffer) {
if (!mBoundDrawFramebuffer->ValidateAndInitAttachments(info))
return false;
} else {
ClearBackbufferIfNeeded();
}
if (!DoFakeVertexAttrib0(mMaxFetchedVertices)) {
return false;
}
return true;
}
bool
WebGLContext::InitAndValidateGL()
{
if (!gl)
return false;
// Unconditionally create a new format usage authority. This is
// important when restoring contexts and extensions need to add
// formats back into the authority.
mFormatUsage = CreateFormatUsage(gl);
if (!mFormatUsage)
return false;
GLenum error = gl->fGetError();
if (error != LOCAL_GL_NO_ERROR) {
GenerateWarning("GL error 0x%x occurred during OpenGL context"
" initialization, before WebGL initialization!", error);
return false;
}
mMinCapability = gfxPrefs::WebGLMinCapabilityMode();
mDisableExtensions = gfxPrefs::WebGLDisableExtensions();
mLoseContextOnMemoryPressure = gfxPrefs::WebGLLoseContextOnMemoryPressure();
mCanLoseContextInForeground = gfxPrefs::WebGLCanLoseContextInForeground();
mRestoreWhenVisible = gfxPrefs::WebGLRestoreWhenVisible();
if (MinCapabilityMode())
mDisableFragHighP = true;
// These are the default values, see 6.2 State tables in the
// OpenGL ES 2.0.25 spec.
mColorWriteMask[0] = 1;
mColorWriteMask[1] = 1;
mColorWriteMask[2] = 1;
mColorWriteMask[3] = 1;
mDepthWriteMask = 1;
mColorClearValue[0] = 0.f;
mColorClearValue[1] = 0.f;
mColorClearValue[2] = 0.f;
mColorClearValue[3] = 0.f;
mDepthClearValue = 1.f;
mStencilClearValue = 0;
mStencilRefFront = 0;
mStencilRefBack = 0;
/*
// Technically, we should be setting mStencil[...] values to
// `allOnes`, but either ANGLE breaks or the SGX540s on Try break.
GLuint stencilBits = 0;
gl->GetUIntegerv(LOCAL_GL_STENCIL_BITS, &stencilBits);
GLuint allOnes = ~(UINT32_MAX << stencilBits);
mStencilValueMaskFront = allOnes;
mStencilValueMaskBack = allOnes;
mStencilWriteMaskFront = allOnes;
mStencilWriteMaskBack = allOnes;
*/
gl->GetUIntegerv(LOCAL_GL_STENCIL_VALUE_MASK, &mStencilValueMaskFront);
gl->GetUIntegerv(LOCAL_GL_STENCIL_BACK_VALUE_MASK, &mStencilValueMaskBack);
gl->GetUIntegerv(LOCAL_GL_STENCIL_WRITEMASK, &mStencilWriteMaskFront);
gl->GetUIntegerv(LOCAL_GL_STENCIL_BACK_WRITEMASK, &mStencilWriteMaskBack);
AssertUintParamCorrect(gl, LOCAL_GL_STENCIL_VALUE_MASK, mStencilValueMaskFront);
AssertUintParamCorrect(gl, LOCAL_GL_STENCIL_BACK_VALUE_MASK, mStencilValueMaskBack);
AssertUintParamCorrect(gl, LOCAL_GL_STENCIL_WRITEMASK, mStencilWriteMaskFront);
AssertUintParamCorrect(gl, LOCAL_GL_STENCIL_BACK_WRITEMASK, mStencilWriteMaskBack);
mDitherEnabled = true;
mRasterizerDiscardEnabled = false;
mScissorTestEnabled = false;
// Bindings, etc.
mActiveTexture = 0;
mDefaultFB_DrawBuffer0 = LOCAL_GL_BACK;
mEmitContextLostErrorOnce = true;
mWebGLError = LOCAL_GL_NO_ERROR;
mUnderlyingGLError = LOCAL_GL_NO_ERROR;
mBound2DTextures.Clear();
mBoundCubeMapTextures.Clear();
mBound3DTextures.Clear();
mBound2DArrayTextures.Clear();
mBoundSamplers.Clear();
mBoundArrayBuffer = nullptr;
mBoundTransformFeedbackBuffer = nullptr;
mCurrentProgram = nullptr;
mBoundDrawFramebuffer = nullptr;
mBoundReadFramebuffer = nullptr;
mBoundRenderbuffer = nullptr;
MakeContextCurrent();
// For OpenGL compat. profiles, we always keep vertex attrib 0 array enabled.
if (gl->IsCompatibilityProfile())
gl->fEnableVertexAttribArray(0);
if (MinCapabilityMode())
mGLMaxVertexAttribs = MINVALUE_GL_MAX_VERTEX_ATTRIBS;
else
gl->fGetIntegerv(LOCAL_GL_MAX_VERTEX_ATTRIBS, &mGLMaxVertexAttribs);
if (mGLMaxVertexAttribs < 8) {
GenerateWarning("GL_MAX_VERTEX_ATTRIBS: %d is < 8!",
mGLMaxVertexAttribs);
return false;
}
// Note: GL_MAX_TEXTURE_UNITS is fixed at 4 for most desktop hardware,
// even though the hardware supports much more. The
// GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS value is the accurate value.
if (MinCapabilityMode())
mGLMaxTextureUnits = MINVALUE_GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS;
else
gl->fGetIntegerv(LOCAL_GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &mGLMaxTextureUnits);
if (mGLMaxTextureUnits < 8) {
GenerateWarning("GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS: %d is < 8!",
mGLMaxTextureUnits);
return false;
}
mBound2DTextures.SetLength(mGLMaxTextureUnits);
mBoundCubeMapTextures.SetLength(mGLMaxTextureUnits);
mBound3DTextures.SetLength(mGLMaxTextureUnits);
mBound2DArrayTextures.SetLength(mGLMaxTextureUnits);
mBoundSamplers.SetLength(mGLMaxTextureUnits);
////////////////
if (MinCapabilityMode()) {
mImplMaxTextureSize = MINVALUE_GL_MAX_TEXTURE_SIZE;
mImplMaxCubeMapTextureSize = MINVALUE_GL_MAX_CUBE_MAP_TEXTURE_SIZE;
mImplMaxRenderbufferSize = MINVALUE_GL_MAX_RENDERBUFFER_SIZE;
mImplMax3DTextureSize = MINVALUE_GL_MAX_3D_TEXTURE_SIZE;
mImplMaxArrayTextureLayers = MINVALUE_GL_MAX_ARRAY_TEXTURE_LAYERS;
mGLMaxTextureImageUnits = MINVALUE_GL_MAX_TEXTURE_IMAGE_UNITS;
mGLMaxVertexTextureImageUnits = MINVALUE_GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS;
} else {
gl->fGetIntegerv(LOCAL_GL_MAX_TEXTURE_SIZE, (GLint*)&mImplMaxTextureSize);
gl->fGetIntegerv(LOCAL_GL_MAX_CUBE_MAP_TEXTURE_SIZE, (GLint*)&mImplMaxCubeMapTextureSize);
gl->fGetIntegerv(LOCAL_GL_MAX_RENDERBUFFER_SIZE, (GLint*)&mImplMaxRenderbufferSize);
if (!gl->GetPotentialInteger(LOCAL_GL_MAX_3D_TEXTURE_SIZE, (GLint*)&mImplMax3DTextureSize))
mImplMax3DTextureSize = 0;
if (!gl->GetPotentialInteger(LOCAL_GL_MAX_ARRAY_TEXTURE_LAYERS, (GLint*)&mImplMaxArrayTextureLayers))
mImplMaxArrayTextureLayers = 0;
gl->fGetIntegerv(LOCAL_GL_MAX_TEXTURE_IMAGE_UNITS, &mGLMaxTextureImageUnits);
gl->fGetIntegerv(LOCAL_GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &mGLMaxVertexTextureImageUnits);
}
// If we don't support a target, its max size is 0. We should only floor-to-POT if the
// value if it's non-zero. (NB log2(0) is -Inf, so zero isn't an integer power-of-two)
const auto fnFloorPOTIfSupported = [](uint32_t& val) {
if (val) {
val = FloorPOT(val);
}
};
fnFloorPOTIfSupported(mImplMaxTextureSize);
fnFloorPOTIfSupported(mImplMaxCubeMapTextureSize);
fnFloorPOTIfSupported(mImplMaxRenderbufferSize);
fnFloorPOTIfSupported(mImplMax3DTextureSize);
fnFloorPOTIfSupported(mImplMaxArrayTextureLayers);
////////////////
mGLMaxColorAttachments = 1;
mGLMaxDrawBuffers = 1;
gl->GetPotentialInteger(LOCAL_GL_MAX_COLOR_ATTACHMENTS,
(GLint*)&mGLMaxColorAttachments);
gl->GetPotentialInteger(LOCAL_GL_MAX_DRAW_BUFFERS, (GLint*)&mGLMaxDrawBuffers);
if (MinCapabilityMode()) {
mGLMaxColorAttachments = std::min(mGLMaxColorAttachments,
kMinMaxColorAttachments);
mGLMaxDrawBuffers = std::min(mGLMaxDrawBuffers, kMinMaxDrawBuffers);
}
if (IsWebGL2()) {
mImplMaxColorAttachments = mGLMaxColorAttachments;
mImplMaxDrawBuffers = std::min(mGLMaxDrawBuffers, mImplMaxColorAttachments);
} else {
mImplMaxColorAttachments = 1;
mImplMaxDrawBuffers = 1;
}
////////////////
if (MinCapabilityMode()) {
mGLMaxFragmentUniformVectors = MINVALUE_GL_MAX_FRAGMENT_UNIFORM_VECTORS;
mGLMaxVertexUniformVectors = MINVALUE_GL_MAX_VERTEX_UNIFORM_VECTORS;
mGLMaxVaryingVectors = MINVALUE_GL_MAX_VARYING_VECTORS;
} else {
if (gl->IsSupported(gl::GLFeature::ES2_compatibility)) {
gl->fGetIntegerv(LOCAL_GL_MAX_FRAGMENT_UNIFORM_VECTORS, &mGLMaxFragmentUniformVectors);
gl->fGetIntegerv(LOCAL_GL_MAX_VERTEX_UNIFORM_VECTORS, &mGLMaxVertexUniformVectors);
gl->fGetIntegerv(LOCAL_GL_MAX_VARYING_VECTORS, &mGLMaxVaryingVectors);
} else {
gl->fGetIntegerv(LOCAL_GL_MAX_FRAGMENT_UNIFORM_COMPONENTS, &mGLMaxFragmentUniformVectors);
mGLMaxFragmentUniformVectors /= 4;
gl->fGetIntegerv(LOCAL_GL_MAX_VERTEX_UNIFORM_COMPONENTS, &mGLMaxVertexUniformVectors);
mGLMaxVertexUniformVectors /= 4;
/* We are now going to try to read GL_MAX_VERTEX_OUTPUT_COMPONENTS
* and GL_MAX_FRAGMENT_INPUT_COMPONENTS, however these constants
* only entered the OpenGL standard at OpenGL 3.2. So we will try
* reading, and check OpenGL error for INVALID_ENUM.
*
* On the public_webgl list, "problematic GetParameter pnames"
* thread, the following formula was given:
* maxVaryingVectors = min(GL_MAX_VERTEX_OUTPUT_COMPONENTS,
* GL_MAX_FRAGMENT_INPUT_COMPONENTS) / 4
*/
GLint maxVertexOutputComponents = 0;
GLint maxFragmentInputComponents = 0;
const bool ok = (gl->GetPotentialInteger(LOCAL_GL_MAX_VERTEX_OUTPUT_COMPONENTS,
&maxVertexOutputComponents) &&
gl->GetPotentialInteger(LOCAL_GL_MAX_FRAGMENT_INPUT_COMPONENTS,
&maxFragmentInputComponents));
if (ok) {
mGLMaxVaryingVectors = std::min(maxVertexOutputComponents,
maxFragmentInputComponents) / 4;
} else {
mGLMaxVaryingVectors = 16;
// 16 = 64/4, and 64 is the min value for
// maxVertexOutputComponents in the OpenGL 3.2 spec.
}
}
}
if (gl->IsCompatibilityProfile()) {
// gl_PointSize is always available in ES2 GLSL, but has to be
// specifically enabled on desktop GLSL.
gl->fEnable(LOCAL_GL_VERTEX_PROGRAM_POINT_SIZE);
/* gl_PointCoord is always available in ES2 GLSL and in newer desktop
* GLSL versions, but apparently not in OpenGL 2 and apparently not (due
* to a driver bug) on certain NVIDIA setups. See:
* http://www.opengl.org/discussion_boards/ubbthreads.php?ubb=showflat&Number=261472
*
* Note that this used to cause crashes on old ATI drivers... Hopefully
* not a significant anymore. See bug 602183.
*/
gl->fEnable(LOCAL_GL_POINT_SPRITE);
}
#ifdef XP_MACOSX
if (gl->WorkAroundDriverBugs() &&
gl->Vendor() == gl::GLVendor::ATI &&
!nsCocoaFeatures::IsAtLeastVersion(10,9))
{
// The Mac ATI driver, in all known OSX version up to and including
// 10.8, renders points sprites upside-down. (Apple bug 11778921)
gl->fPointParameterf(LOCAL_GL_POINT_SPRITE_COORD_ORIGIN,
LOCAL_GL_LOWER_LEFT);
}
#endif
if (gl->IsSupported(gl::GLFeature::seamless_cube_map_opt_in)) {
gl->fEnable(LOCAL_GL_TEXTURE_CUBE_MAP_SEAMLESS);
}
// Check the shader validator pref
mBypassShaderValidation = gfxPrefs::WebGLBypassShaderValidator();
// initialize shader translator
if (!ShInitialize()) {
GenerateWarning("GLSL translator initialization failed!");
return false;
}
// Mesa can only be detected with the GL_VERSION string, of the form
// "2.1 Mesa 7.11.0"
const char* versionStr = (const char*)(gl->fGetString(LOCAL_GL_VERSION));
mIsMesa = strstr(versionStr, "Mesa");
// Notice that the point of calling fGetError here is not only to check for
// errors, but also to reset the error flags so that a subsequent WebGL
// getError call will give the correct result.
error = gl->fGetError();
if (error != LOCAL_GL_NO_ERROR) {
GenerateWarning("GL error 0x%x occurred during WebGL context"
" initialization!", error);
return false;
}
if (IsWebGL2() &&
!InitWebGL2())
{
// Todo: Bug 898404: Only allow WebGL2 on GL>=3.0 on desktop GL.
return false;
}
// Default value for all disabled vertex attributes is [0, 0, 0, 1]
mVertexAttribType = MakeUnique<GLenum[]>(mGLMaxVertexAttribs);
for (int32_t index = 0; index < mGLMaxVertexAttribs; ++index) {
mVertexAttribType[index] = LOCAL_GL_FLOAT;
VertexAttrib4f(index, 0, 0, 0, 1);
}
mDefaultVertexArray = WebGLVertexArray::Create(this);
mDefaultVertexArray->mAttribs.SetLength(mGLMaxVertexAttribs);
mBoundVertexArray = mDefaultVertexArray;
// OpenGL core profiles remove the default VAO object from version
// 4.0.0. We create a default VAO for all core profiles,
// regardless of version.
//
// GL Spec 4.0.0:
// (https://www.opengl.org/registry/doc/glspec40.core.20100311.pdf)
// in Section E.2.2 "Removed Features", pg 397: "[...] The default
// vertex array object (the name zero) is also deprecated. [...]"
if (gl->IsCoreProfile()) {
MakeContextCurrent();
mDefaultVertexArray->GenVertexArray();
mDefaultVertexArray->BindVertexArray();
}
mPixelStore_FlipY = false;
mPixelStore_PremultiplyAlpha = false;
mPixelStore_ColorspaceConversion = BROWSER_DEFAULT_WEBGL;
// GLES 3.0.4, p259:
mPixelStore_UnpackImageHeight = 0;
mPixelStore_UnpackSkipImages = 0;
mPixelStore_UnpackRowLength = 0;
mPixelStore_UnpackSkipRows = 0;
mPixelStore_UnpackSkipPixels = 0;
mPixelStore_UnpackAlignment = 4;
mPixelStore_PackRowLength = 0;
mPixelStore_PackSkipRows = 0;
mPixelStore_PackSkipPixels = 0;
mPixelStore_PackAlignment = 4;
return true;
}
void
WebGLContext::AssertCachedBindings()
{
#ifdef DEBUG
MakeContextCurrent();
GetAndFlushUnderlyingGLErrors();
if (IsWebGL2() || IsExtensionEnabled(WebGLExtensionID::OES_vertex_array_object)) {
GLuint bound = mBoundVertexArray ? mBoundVertexArray->GLName() : 0;
AssertUintParamCorrect(gl, LOCAL_GL_VERTEX_ARRAY_BINDING, bound);
}
// Framebuffers
if (IsWebGL2()) {
GLuint bound = mBoundDrawFramebuffer ? mBoundDrawFramebuffer->mGLName
: 0;
AssertUintParamCorrect(gl, LOCAL_GL_DRAW_FRAMEBUFFER_BINDING, bound);
bound = mBoundReadFramebuffer ? mBoundReadFramebuffer->mGLName : 0;
AssertUintParamCorrect(gl, LOCAL_GL_READ_FRAMEBUFFER_BINDING, bound);
} else {
MOZ_ASSERT(mBoundDrawFramebuffer == mBoundReadFramebuffer);
GLuint bound = mBoundDrawFramebuffer ? mBoundDrawFramebuffer->mGLName
: 0;
AssertUintParamCorrect(gl, LOCAL_GL_FRAMEBUFFER_BINDING, bound);
}
GLint stencilBits = 0;
if (GetStencilBits(&stencilBits)) { // Depends on current draw framebuffer.
const GLuint stencilRefMask = (1 << stencilBits) - 1;
AssertMaskedUintParamCorrect(gl, LOCAL_GL_STENCIL_REF, stencilRefMask, mStencilRefFront);
AssertMaskedUintParamCorrect(gl, LOCAL_GL_STENCIL_BACK_REF, stencilRefMask, mStencilRefBack);
}
// Program
GLuint bound = mCurrentProgram ? mCurrentProgram->mGLName : 0;
AssertUintParamCorrect(gl, LOCAL_GL_CURRENT_PROGRAM, bound);
// Textures
GLenum activeTexture = mActiveTexture + LOCAL_GL_TEXTURE0;
AssertUintParamCorrect(gl, LOCAL_GL_ACTIVE_TEXTURE, activeTexture);
WebGLTexture* curTex = ActiveBoundTextureForTarget(LOCAL_GL_TEXTURE_2D);
bound = curTex ? curTex->mGLName : 0;
AssertUintParamCorrect(gl, LOCAL_GL_TEXTURE_BINDING_2D, bound);
curTex = ActiveBoundTextureForTarget(LOCAL_GL_TEXTURE_CUBE_MAP);
bound = curTex ? curTex->mGLName : 0;
AssertUintParamCorrect(gl, LOCAL_GL_TEXTURE_BINDING_CUBE_MAP, bound);
// Buffers
bound = mBoundArrayBuffer ? mBoundArrayBuffer->mGLName : 0;
AssertUintParamCorrect(gl, LOCAL_GL_ARRAY_BUFFER_BINDING, bound);
MOZ_ASSERT(mBoundVertexArray);
WebGLBuffer* curBuff = mBoundVertexArray->mElementArrayBuffer;
bound = curBuff ? curBuff->mGLName : 0;
AssertUintParamCorrect(gl, LOCAL_GL_ELEMENT_ARRAY_BUFFER_BINDING, bound);
MOZ_ASSERT(!GetAndFlushUnderlyingGLErrors());
#endif
// We do not check the renderbuffer binding, because we never rely on it matching.
}
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_debug_renderer_info:
return Preferences::GetBool("webgl.enable-debug-renderer-info", false);
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 (gfxPrefs::WebGLDraftExtensionsEnabled() || IsWebGL2()) {
switch (ext) {
case WebGLExtensionID::EXT_disjoint_timer_query:
return WebGLExtensionDisjointTimerQuery::IsSupported(this);
default:
// For warnings-as-errors.
break;
}
}
return false;
}
void
WebGLContext::AssertCachedGlobalState()
{
#ifdef DEBUG
MakeContextCurrent();
GetAndFlushUnderlyingGLErrors();
////////////////
// Draw state
MOZ_ASSERT(gl->fIsEnabled(LOCAL_GL_DEPTH_TEST) == mDepthTestEnabled);
MOZ_ASSERT(gl->fIsEnabled(LOCAL_GL_DITHER) == mDitherEnabled);
MOZ_ASSERT_IF(IsWebGL2(),
gl->fIsEnabled(LOCAL_GL_RASTERIZER_DISCARD) == mRasterizerDiscardEnabled);
MOZ_ASSERT(gl->fIsEnabled(LOCAL_GL_SCISSOR_TEST) == mScissorTestEnabled);
MOZ_ASSERT(gl->fIsEnabled(LOCAL_GL_STENCIL_TEST) == mStencilTestEnabled);
realGLboolean colorWriteMask[4] = {0, 0, 0, 0};
gl->fGetBooleanv(LOCAL_GL_COLOR_WRITEMASK, colorWriteMask);
MOZ_ASSERT(colorWriteMask[0] == mColorWriteMask[0] &&
colorWriteMask[1] == mColorWriteMask[1] &&
colorWriteMask[2] == mColorWriteMask[2] &&
colorWriteMask[3] == mColorWriteMask[3]);
GLfloat colorClearValue[4] = {0.0f, 0.0f, 0.0f, 0.0f};
gl->fGetFloatv(LOCAL_GL_COLOR_CLEAR_VALUE, colorClearValue);
MOZ_ASSERT(IsCacheCorrect(mColorClearValue[0], colorClearValue[0]) &&
IsCacheCorrect(mColorClearValue[1], colorClearValue[1]) &&
IsCacheCorrect(mColorClearValue[2], colorClearValue[2]) &&
IsCacheCorrect(mColorClearValue[3], colorClearValue[3]));
realGLboolean depthWriteMask = 0;
gl->fGetBooleanv(LOCAL_GL_DEPTH_WRITEMASK, &depthWriteMask);
MOZ_ASSERT(depthWriteMask == mDepthWriteMask);
GLfloat depthClearValue = 0.0f;
gl->fGetFloatv(LOCAL_GL_DEPTH_CLEAR_VALUE, &depthClearValue);
MOZ_ASSERT(IsCacheCorrect(mDepthClearValue, depthClearValue));
AssertUintParamCorrect(gl, LOCAL_GL_STENCIL_CLEAR_VALUE, mStencilClearValue);
// GLES 3.0.4, $4.1.4, p177:
// [...] the front and back stencil mask are both set to the value `2^s - 1`, where
// `s` is greater than or equal to the number of bits in the deepest stencil buffer
// supported by the GL implementation.
const int maxStencilBits = 8;
const GLuint maxStencilBitsMask = (1 << maxStencilBits) - 1;
AssertMaskedUintParamCorrect(gl, LOCAL_GL_STENCIL_VALUE_MASK, maxStencilBitsMask, mStencilValueMaskFront);
AssertMaskedUintParamCorrect(gl, LOCAL_GL_STENCIL_BACK_VALUE_MASK, maxStencilBitsMask, mStencilValueMaskBack);
AssertMaskedUintParamCorrect(gl, LOCAL_GL_STENCIL_WRITEMASK, maxStencilBitsMask, mStencilWriteMaskFront);
AssertMaskedUintParamCorrect(gl, LOCAL_GL_STENCIL_BACK_WRITEMASK, maxStencilBitsMask, mStencilWriteMaskBack);
// Viewport
GLint int4[4] = {0, 0, 0, 0};
gl->fGetIntegerv(LOCAL_GL_VIEWPORT, int4);
MOZ_ASSERT(int4[0] == mViewportX &&
int4[1] == mViewportY &&
int4[2] == mViewportWidth &&
int4[3] == mViewportHeight);
AssertUintParamCorrect(gl, LOCAL_GL_PACK_ALIGNMENT, mPixelStore_PackAlignment);
AssertUintParamCorrect(gl, LOCAL_GL_UNPACK_ALIGNMENT, mPixelStore_UnpackAlignment);
if (IsWebGL2()) {
AssertUintParamCorrect(gl, LOCAL_GL_UNPACK_IMAGE_HEIGHT, mPixelStore_UnpackImageHeight);
AssertUintParamCorrect(gl, LOCAL_GL_UNPACK_SKIP_IMAGES , mPixelStore_UnpackSkipImages);
AssertUintParamCorrect(gl, LOCAL_GL_UNPACK_ROW_LENGTH , mPixelStore_UnpackRowLength);
AssertUintParamCorrect(gl, LOCAL_GL_UNPACK_SKIP_ROWS , mPixelStore_UnpackSkipRows);
AssertUintParamCorrect(gl, LOCAL_GL_UNPACK_SKIP_PIXELS , mPixelStore_UnpackSkipPixels);
AssertUintParamCorrect(gl, LOCAL_GL_PACK_ROW_LENGTH , mPixelStore_PackRowLength);
AssertUintParamCorrect(gl, LOCAL_GL_PACK_SKIP_ROWS , mPixelStore_PackSkipRows);
AssertUintParamCorrect(gl, LOCAL_GL_PACK_SKIP_PIXELS , mPixelStore_PackSkipPixels);
}
MOZ_ASSERT(!GetAndFlushUnderlyingGLErrors());
#endif
}
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_astc:
return WebGLExtensionCompressedTextureASTC::IsSupported(this);
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) &&
!gl->IsANGLE();
case WebGLExtensionID::WEBGL_compressed_texture_etc1:
return gl->IsExtensionSupported(gl::GLContext::OES_compressed_ETC1_RGB8_texture) &&
!gl->IsANGLE();
case WebGLExtensionID::WEBGL_compressed_texture_pvrtc:
return gl->IsExtensionSupported(gl::GLContext::IMG_texture_compression_pvrtc);
case WebGLExtensionID::WEBGL_compressed_texture_s3tc:
return WebGLExtensionCompressedTextureS3TC::IsSupported(this);
case WebGLExtensionID::WEBGL_compressed_texture_s3tc_srgb:
return WebGLExtensionCompressedTextureS3TC_SRGB::IsSupported(this);
case WebGLExtensionID::WEBGL_debug_renderer_info:
return Preferences::GetBool("webgl.enable-debug-renderer-info", false);
case WebGLExtensionID::WEBGL_debug_shaders:
return !nsContentUtils::ShouldResistFingerprinting();
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;
}
bool
WebGLContext::DrawElements_check(const char* funcName, GLenum mode, GLsizei vertCount,
GLenum type, WebGLintptr byteOffset,
GLsizei instanceCount)
{
if (!ValidateDrawModeEnum(mode, funcName))
return false;
if (mBoundTransformFeedback &&
mBoundTransformFeedback->mIsActive &&
!mBoundTransformFeedback->mIsPaused)
{
ErrorInvalidOperation("%s: DrawElements* functions are incompatible with"
" transform feedback.",
funcName);
return false;
}
if (!ValidateNonNegative(funcName, "vertCount", vertCount) ||
!ValidateNonNegative(funcName, "byteOffset", byteOffset) ||
!ValidateNonNegative(funcName, "instanceCount", instanceCount))
{
return false;
}
if (!ValidateStencilParamsForDrawCall())
return false;
if (!vertCount || !instanceCount)
return false; // No error, just early out.
uint8_t bytesPerElem = 0;
switch (type) {
case LOCAL_GL_UNSIGNED_BYTE:
bytesPerElem = 1;
break;
case LOCAL_GL_UNSIGNED_SHORT:
bytesPerElem = 2;
break;
case LOCAL_GL_UNSIGNED_INT:
if (IsWebGL2() || IsExtensionEnabled(WebGLExtensionID::OES_element_index_uint)) {
bytesPerElem = 4;
}
break;
}
if (!bytesPerElem) {
ErrorInvalidEnum("%s: Invalid `type`: 0x%04x", funcName, type);
return false;
}
if (byteOffset % bytesPerElem != 0) {
ErrorInvalidOperation("%s: `byteOffset` must be a multiple of the size of `type`",
funcName);
return false;
}
////
if (IsWebGL2() && !gl->IsSupported(gl::GLFeature::prim_restart_fixed)) {
MOZ_ASSERT(gl->IsSupported(gl::GLFeature::prim_restart));
if (mPrimRestartTypeBytes != bytesPerElem) {
mPrimRestartTypeBytes = bytesPerElem;
const uint32_t ones = UINT32_MAX >> (32 - 8*mPrimRestartTypeBytes);
gl->fEnable(LOCAL_GL_PRIMITIVE_RESTART);
gl->fPrimitiveRestartIndex(ones);
}
JS::Value
WebGLContext::GetVertexAttrib(JSContext* cx, GLuint index, GLenum pname,
ErrorResult& rv)
{
const char funcName[] = "getVertexAttrib";
if (IsContextLost())
return JS::NullValue();
if (!ValidateAttribIndex(index, funcName))
return JS::NullValue();
MOZ_ASSERT(mBoundVertexArray);
MakeContextCurrent();
switch (pname) {
case LOCAL_GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING:
return WebGLObjectAsJSValue(cx, mBoundVertexArray->mAttribs[index].mBuf.get(), rv);
case LOCAL_GL_VERTEX_ATTRIB_ARRAY_STRIDE:
return JS::Int32Value(mBoundVertexArray->mAttribs[index].Stride());
case LOCAL_GL_VERTEX_ATTRIB_ARRAY_SIZE:
return JS::Int32Value(mBoundVertexArray->mAttribs[index].Size());
case LOCAL_GL_VERTEX_ATTRIB_ARRAY_TYPE:
return JS::Int32Value(mBoundVertexArray->mAttribs[index].Type());
case LOCAL_GL_VERTEX_ATTRIB_ARRAY_INTEGER:
if (IsWebGL2())
return JS::BooleanValue(mBoundVertexArray->mAttribs[index].IntegerFunc());
break;
case LOCAL_GL_VERTEX_ATTRIB_ARRAY_DIVISOR:
if (IsWebGL2() ||
IsExtensionEnabled(WebGLExtensionID::ANGLE_instanced_arrays))
{
return JS::Int32Value(mBoundVertexArray->mAttribs[index].mDivisor);
}
break;
case LOCAL_GL_CURRENT_VERTEX_ATTRIB:
{
JS::RootedObject obj(cx);
switch (mGenericVertexAttribTypes[index]) {
case LOCAL_GL_FLOAT:
obj = GetVertexAttribFloat32Array(cx, index);
break;
case LOCAL_GL_INT:
obj = GetVertexAttribInt32Array(cx, index);
break;
case LOCAL_GL_UNSIGNED_INT:
obj = GetVertexAttribUint32Array(cx, index);
break;
}
if (!obj)
rv.Throw(NS_ERROR_OUT_OF_MEMORY);
return JS::ObjectOrNullValue(obj);
}
case LOCAL_GL_VERTEX_ATTRIB_ARRAY_ENABLED:
return JS::BooleanValue(mBoundVertexArray->mAttribs[index].mEnabled);
case LOCAL_GL_VERTEX_ATTRIB_ARRAY_NORMALIZED:
return JS::BooleanValue(mBoundVertexArray->mAttribs[index].Normalized());
default:
break;
}
ErrorInvalidEnumInfo("getVertexAttrib: parameter", pname);
return JS::NullValue();
}
bool
WebGLContext::InitWebGL2(FailureReason* const out_failReason)
{
MOZ_ASSERT(IsWebGL2(), "WebGLContext is not a WebGL 2 context!");
std::vector<gl::GLFeature> missingList;
const auto fnGatherMissing = [&](gl::GLFeature cur) {
if (!gl->IsSupported(cur)) {
missingList.push_back(cur);
}
};
const auto fnGatherMissing2 = [&](gl::GLFeature main, gl::GLFeature alt) {
if (!gl->IsSupported(main) && !gl->IsSupported(alt)) {
missingList.push_back(main);
}
};
////
for (const auto& cur : kRequiredFeatures) {
fnGatherMissing(cur);
}
// On desktop, we fake occlusion_query_boolean with occlusion_query if
// necessary. (See WebGL2ContextQueries.cpp)
fnGatherMissing2(gl::GLFeature::occlusion_query_boolean,
gl::GLFeature::occlusion_query);
#ifdef XP_MACOSX
// On OSX, GL core profile is used. This requires texture swizzle
// support to emulate legacy texture formats: ALPHA, LUMINANCE,
// and LUMINANCE_ALPHA.
fnGatherMissing(gl::GLFeature::texture_swizzle);
#endif
fnGatherMissing2(gl::GLFeature::prim_restart_fixed,
gl::GLFeature::prim_restart);
////
if (!missingList.empty()) {
nsAutoCString exts;
for (auto itr = missingList.begin(); itr != missingList.end(); ++itr) {
exts.AppendLiteral("\n ");
exts.Append(gl::GLContext::GetFeatureName(*itr));
}
const nsPrintfCString reason("WebGL 2 requires support for the following"
" features: %s",
exts.BeginReading());
*out_failReason = FailureReason("FEATURE_FAILURE_WEBGL2_OCCL", reason);
return false;
}
// we initialise WebGL 2 related stuff.
gl->GetUIntegerv(LOCAL_GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS,
&mGLMaxTransformFeedbackSeparateAttribs);
gl->GetUIntegerv(LOCAL_GL_MAX_UNIFORM_BUFFER_BINDINGS,
&mGLMaxUniformBufferBindings);
mIndexedUniformBufferBindings.resize(mGLMaxUniformBufferBindings);
mDefaultTransformFeedback = new WebGLTransformFeedback(this, 0);
mBoundTransformFeedback = mDefaultTransformFeedback;
gl->fGenTransformFeedbacks(1, &mEmptyTFO);
////
if (!gl->IsGLES()) {
// Desktop OpenGL requires the following to be enabled in order to
// support sRGB operations on framebuffers.
gl->fEnable(LOCAL_GL_FRAMEBUFFER_SRGB_EXT);
}
if (gl->IsSupported(gl::GLFeature::prim_restart_fixed)) {
gl->fEnable(LOCAL_GL_PRIMITIVE_RESTART_FIXED_INDEX);
} else {
MOZ_ASSERT(gl->IsSupported(gl::GLFeature::prim_restart));
}
//////
return true;
}
bool
WebGLContext::InitWebGL2()
{
MOZ_ASSERT(IsWebGL2(), "WebGLContext is not a WebGL 2 context!");
// check OpenGL features
if (!gl->IsSupported(gl::GLFeature::occlusion_query) &&
!gl->IsSupported(gl::GLFeature::occlusion_query_boolean))
{
// On desktop, we fake occlusion_query_boolean with occlusion_query if
// necessary. (See WebGL2ContextQueries.cpp)
GenerateWarning("WebGL 2 unavailable. Requires occlusion queries.");
return false;
}
std::vector<gl::GLFeature> missingList;
for (size_t i = 0; i < ArrayLength(kRequiredFeatures); i++) {
if (!gl->IsSupported(kRequiredFeatures[i]))
missingList.push_back(kRequiredFeatures[i]);
}
#ifdef XP_MACOSX
// On OSX, GL core profile is used. This requires texture swizzle
// support to emulate legacy texture formats: ALPHA, LUMINANCE,
// and LUMINANCE_ALPHA.
if (!gl->IsSupported(gl::GLFeature::texture_swizzle))
missingList.push_back(gl::GLFeature::texture_swizzle);
#endif
if (missingList.size()) {
nsAutoCString exts;
for (auto itr = missingList.begin(); itr != missingList.end(); ++itr) {
exts.AppendLiteral("\n ");
exts.Append(gl::GLContext::GetFeatureName(*itr));
}
GenerateWarning("WebGL 2 unavailable. The following required features are"
" unavailible: %s", exts.BeginReading());
return false;
}
// we initialise WebGL 2 related stuff.
gl->GetUIntegerv(LOCAL_GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS,
&mGLMaxTransformFeedbackSeparateAttribs);
gl->GetUIntegerv(LOCAL_GL_MAX_UNIFORM_BUFFER_BINDINGS,
&mGLMaxUniformBufferBindings);
mBoundTransformFeedbackBuffers.SetLength(mGLMaxTransformFeedbackSeparateAttribs);
mBoundUniformBuffers.SetLength(mGLMaxUniformBufferBindings);
mDefaultTransformFeedback = new WebGLTransformFeedback(this, 0);
mBoundTransformFeedback = mDefaultTransformFeedback;
if (!gl->IsGLES()) {
// Desktop OpenGL requires the following to be enabled in order to
// support sRGB operations on framebuffers.
gl->MakeCurrent();
gl->fEnable(LOCAL_GL_FRAMEBUFFER_SRGB_EXT);
}
return true;
}
