summaryrefslogtreecommitdiffstats
path: root/dom/canvas/WebGLContextState.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'dom/canvas/WebGLContextState.cpp')
-rw-r--r--dom/canvas/WebGLContextState.cpp732
1 files changed, 732 insertions, 0 deletions
diff --git a/dom/canvas/WebGLContextState.cpp b/dom/canvas/WebGLContextState.cpp
new file mode 100644
index 000000000..e0234f5c6
--- /dev/null
+++ b/dom/canvas/WebGLContextState.cpp
@@ -0,0 +1,732 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "WebGLContext.h"
+
+#include "GLContext.h"
+#include "GLScreenBuffer.h"
+#include "mozilla/dom/ToJSValue.h"
+#include "mozilla/Preferences.h"
+#include "nsString.h"
+#include "WebGLBuffer.h"
+#include "WebGLContextUtils.h"
+#include "WebGLFramebuffer.h"
+#include "WebGLProgram.h"
+#include "WebGLRenderbuffer.h"
+#include "WebGLShader.h"
+#include "WebGLTexture.h"
+#include "WebGLVertexArray.h"
+
+namespace mozilla {
+
+void
+WebGLContext::Disable(GLenum cap)
+{
+ if (IsContextLost())
+ return;
+
+ if (!ValidateCapabilityEnum(cap, "disable"))
+ return;
+
+ realGLboolean* trackingSlot = GetStateTrackingSlot(cap);
+
+ if (trackingSlot)
+ {
+ *trackingSlot = 0;
+ }
+
+ MakeContextCurrent();
+ gl->fDisable(cap);
+}
+
+void
+WebGLContext::Enable(GLenum cap)
+{
+ if (IsContextLost())
+ return;
+
+ if (!ValidateCapabilityEnum(cap, "enable"))
+ return;
+
+ realGLboolean* trackingSlot = GetStateTrackingSlot(cap);
+
+ if (trackingSlot)
+ {
+ *trackingSlot = 1;
+ }
+
+ MakeContextCurrent();
+ gl->fEnable(cap);
+}
+
+static JS::Value
+StringValue(JSContext* cx, const nsAString& str, ErrorResult& rv)
+{
+ JSString* jsStr = JS_NewUCStringCopyN(cx, str.BeginReading(), str.Length());
+ if (!jsStr) {
+ rv.Throw(NS_ERROR_OUT_OF_MEMORY);
+ return JS::NullValue();
+ }
+
+ return JS::StringValue(jsStr);
+}
+
+bool
+WebGLContext::GetStencilBits(GLint* const out_stencilBits)
+{
+ *out_stencilBits = 0;
+ if (mBoundDrawFramebuffer) {
+ if (mBoundDrawFramebuffer->StencilAttachment().IsDefined() &&
+ mBoundDrawFramebuffer->DepthStencilAttachment().IsDefined())
+ {
+ // Error, we don't know which stencil buffer's bits to use
+ ErrorInvalidFramebufferOperation("getParameter: framebuffer has two stencil buffers bound");
+ return false;
+ }
+
+ if (mBoundDrawFramebuffer->StencilAttachment().IsDefined() ||
+ mBoundDrawFramebuffer->DepthStencilAttachment().IsDefined())
+ {
+ *out_stencilBits = 8;
+ }
+ } else if (mOptions.stencil) {
+ *out_stencilBits = 8;
+ }
+
+ return true;
+}
+
+bool
+WebGLContext::GetChannelBits(const char* funcName, GLenum pname, GLint* const out_val)
+{
+ if (mBoundDrawFramebuffer) {
+ if (!mBoundDrawFramebuffer->ValidateAndInitAttachments(funcName))
+ return false;
+ }
+
+ if (!mBoundDrawFramebuffer) {
+ switch (pname) {
+ case LOCAL_GL_RED_BITS:
+ case LOCAL_GL_GREEN_BITS:
+ case LOCAL_GL_BLUE_BITS:
+ *out_val = 8;
+ break;
+
+ case LOCAL_GL_ALPHA_BITS:
+ *out_val = (mOptions.alpha ? 8 : 0);
+ break;
+
+ case LOCAL_GL_DEPTH_BITS:
+ if (mOptions.depth) {
+ *out_val = gl->Screen()->DepthBits();
+ } else {
+ *out_val = 0;
+ }
+ break;
+
+ case LOCAL_GL_STENCIL_BITS:
+ *out_val = (mOptions.stencil ? 8 : 0);
+ break;
+
+ default:
+ MOZ_CRASH("GFX: bad pname");
+ }
+ return true;
+ }
+
+ if (!gl->IsCoreProfile()) {
+ gl->fGetIntegerv(pname, out_val);
+ return true;
+ }
+
+ GLenum fbAttachment = 0;
+ GLenum fbPName = 0;
+ switch (pname) {
+ case LOCAL_GL_RED_BITS:
+ fbAttachment = LOCAL_GL_COLOR_ATTACHMENT0;
+ fbPName = LOCAL_GL_FRAMEBUFFER_ATTACHMENT_RED_SIZE;
+ break;
+
+ case LOCAL_GL_GREEN_BITS:
+ fbAttachment = LOCAL_GL_COLOR_ATTACHMENT0;
+ fbPName = LOCAL_GL_FRAMEBUFFER_ATTACHMENT_GREEN_SIZE;
+ break;
+
+ case LOCAL_GL_BLUE_BITS:
+ fbAttachment = LOCAL_GL_COLOR_ATTACHMENT0;
+ fbPName = LOCAL_GL_FRAMEBUFFER_ATTACHMENT_BLUE_SIZE;
+ break;
+
+ case LOCAL_GL_ALPHA_BITS:
+ fbAttachment = LOCAL_GL_COLOR_ATTACHMENT0;
+ fbPName = LOCAL_GL_FRAMEBUFFER_ATTACHMENT_ALPHA_SIZE;
+ break;
+
+ case LOCAL_GL_DEPTH_BITS:
+ fbAttachment = LOCAL_GL_DEPTH_ATTACHMENT;
+ fbPName = LOCAL_GL_FRAMEBUFFER_ATTACHMENT_DEPTH_SIZE;
+ break;
+
+ case LOCAL_GL_STENCIL_BITS:
+ fbAttachment = LOCAL_GL_STENCIL_ATTACHMENT;
+ fbPName = LOCAL_GL_FRAMEBUFFER_ATTACHMENT_STENCIL_SIZE;
+ break;
+
+ default:
+ MOZ_CRASH("GFX: bad pname");
+ }
+
+ gl->fGetFramebufferAttachmentParameteriv(LOCAL_GL_DRAW_FRAMEBUFFER, fbAttachment,
+ fbPName, out_val);
+ return true;
+}
+
+JS::Value
+WebGLContext::GetParameter(JSContext* cx, GLenum pname, ErrorResult& rv)
+{
+ const char funcName[] = "getParameter";
+
+ 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 ret = LOCAL_GL_NONE;
+ if (!mBoundDrawFramebuffer) {
+ if (pname == LOCAL_GL_DRAW_BUFFER0) {
+ ret = gl->Screen()->GetDrawBufferMode();
+ }
+ } else {
+ gl->fGetIntegerv(pname, &ret);
+ }
+ return JS::Int32Value(ret);
+ }
+ }
+
+ 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 (IsExtensionEnabled(WebGLExtensionID::EXT_disjoint_timer_query)) {
+ switch (pname) {
+ case LOCAL_GL_TIMESTAMP_EXT:
+ {
+ uint64_t val = 0;
+ if (Has64BitTimestamps()) {
+ gl->fGetInteger64v(pname, (GLint64*)&val);
+ } else {
+ gl->fGetIntegerv(pname, (GLint*)&val);
+ }
+ // TODO: JS doesn't support 64-bit integers. Be lossy and
+ // cast to double (53 bits)
+ return JS::NumberValue(val);
+ }
+
+ case LOCAL_GL_GPU_DISJOINT_EXT:
+ {
+ realGLboolean val = false; // Not disjoint by default.
+ if (gl->IsExtensionSupported(gl::GLContext::EXT_disjoint_timer_query)) {
+ gl->fGetBooleanv(pname, &val);
+ }
+ return JS::BooleanValue(val);
+ }
+
+ default:
+ break;
+ }
+ }
+
+ // 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("GFX: 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: {
+ GLint i = 0;
+ gl->fGetIntegerv(pname, &i);
+ return JS::NumberValue(uint32_t(i));
+ }
+
+ case LOCAL_GL_GENERATE_MIPMAP_HINT:
+ return JS::NumberValue(mGenerateMipmapHint);
+
+ case LOCAL_GL_IMPLEMENTATION_COLOR_READ_FORMAT:
+ case LOCAL_GL_IMPLEMENTATION_COLOR_READ_TYPE: {
+ const webgl::FormatUsageInfo* usage;
+ uint32_t width, height;
+ if (!ValidateCurFBForRead(funcName, &usage, &width, &height))
+ return JS::NullValue();
+
+ const auto implPI = ValidImplementationColorReadPI(usage);
+
+ GLenum ret;
+ if (pname == LOCAL_GL_IMPLEMENTATION_COLOR_READ_FORMAT) {
+ ret = implPI.format;
+ } else {
+ ret = implPI.type;
+ }
+ return JS::NumberValue(uint32_t(ret));
+ }
+
+ // 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_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: {
+ GLint i = 0;
+ gl->fGetIntegerv(pname, &i);
+ return JS::Int32Value(i);
+ }
+
+ case LOCAL_GL_RED_BITS:
+ case LOCAL_GL_GREEN_BITS:
+ case LOCAL_GL_BLUE_BITS:
+ case LOCAL_GL_ALPHA_BITS:
+ case LOCAL_GL_DEPTH_BITS:
+ case LOCAL_GL_STENCIL_BITS: {
+ // Deprecated and removed in GL Core profiles, so special handling required.
+ GLint val;
+ if (!GetChannelBits(funcName, pname, &val))
+ return JS::NullValue();
+
+ return JS::Int32Value(val);
+ }
+
+ 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_LINE_WIDTH:
+ return JS::DoubleValue(mLineWidth);
+
+ case LOCAL_GL_DEPTH_CLEAR_VALUE:
+ 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: {
+ GLenum driverPName = pname;
+ if (gl->IsCoreProfile() &&
+ driverPName == LOCAL_GL_ALIASED_POINT_SIZE_RANGE)
+ {
+ driverPName = LOCAL_GL_POINT_SIZE_RANGE;
+ }
+
+ GLfloat fv[2] = { 0 };
+ gl->fGetFloatv(driverPName, 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::GetParameterIndexed(JSContext* cx, GLenum pname, GLuint index,
+ JS::MutableHandle<JS::Value> retval)
+{
+ if (IsContextLost()) {
+ retval.setNull();
+ return;
+ }
+
+ MakeContextCurrent();
+
+ switch (pname) {
+ case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER_BINDING:
+ {
+ if (index >= mGLMaxTransformFeedbackSeparateAttribs) {
+ ErrorInvalidValue("getParameterIndexed: index should be less than MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS", index);
+ retval.setNull();
+ return;
+ }
+ retval.setNull(); // See bug 903594
+ return;
+ }
+
+ default:
+ break;
+ }
+
+ ErrorInvalidEnumInfo("getParameterIndexed: parameter", pname);
+ retval.setNull();
+}
+
+bool
+WebGLContext::IsEnabled(GLenum cap)
+{
+ if (IsContextLost())
+ return false;
+
+ if (!ValidateCapabilityEnum(cap, "isEnabled"))
+ return false;
+
+ MakeContextCurrent();
+ return gl->fIsEnabled(cap);
+}
+
+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;
+ }
+}
+
+realGLboolean*
+WebGLContext::GetStateTrackingSlot(GLenum cap)
+{
+ switch (cap) {
+ case LOCAL_GL_DEPTH_TEST:
+ return &mDepthTestEnabled;
+ case LOCAL_GL_DITHER:
+ return &mDitherEnabled;
+ case LOCAL_GL_RASTERIZER_DISCARD:
+ return &mRasterizerDiscardEnabled;
+ case LOCAL_GL_SCISSOR_TEST:
+ return &mScissorTestEnabled;
+ case LOCAL_GL_STENCIL_TEST:
+ return &mStencilTestEnabled;
+ }
+
+ return nullptr;
+}
+
+} // namespace mozilla