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 (IsExtensionEnabled(WebGLExtensionID::WEBGL_draw_buffers)) {
if (pname == LOCAL_GL_MAX_COLOR_ATTACHMENTS) {
return JS::Int32Value(mGLMaxColorAttachments);
} else if (pname == LOCAL_GL_MAX_DRAW_BUFFERS) {
return JS::Int32Value(mGLMaxDrawBuffers);
} else if (pname >= LOCAL_GL_DRAW_BUFFER0 &&
pname < GLenum(LOCAL_GL_DRAW_BUFFER0 + mGLMaxDrawBuffers))
{
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 (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 (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 (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) {
FBStatus status = mBoundReadFramebuffer->CheckFramebufferStatus();
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) {
FBStatus status = mBoundReadFramebuffer->CheckFramebufferStatus();
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;
}
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:
case LOCAL_GL_DEPTH_BITS: {
GLint i = 0;
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(mGLMaxTextureSize);
case LOCAL_GL_MAX_CUBE_MAP_TEXTURE_SIZE:
return JS::Int32Value(mGLMaxCubeMapTextureSize);
case LOCAL_GL_MAX_RENDERBUFFER_SIZE:
return JS::Int32Value(mGLMaxRenderbufferSize);
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_NUM_COMPRESSED_TEXTURE_FORMATS:
return JS::Int32Value(0);
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(mPixelStoreFlipY);
case UNPACK_PREMULTIPLY_ALPHA_WEBGL:
return JS::BooleanValue(mPixelStorePremultiplyAlpha);
// uint, WebGL-specific
case UNPACK_COLORSPACE_CONVERSION_WEBGL:
return JS::NumberValue(uint32_t(mPixelStoreColorspaceConversion));
////////////////////////////////
// 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();
}
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;
}