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gecko/dom/canvas/WebGLContextState.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "WebGLContext.h"
#include "WebGLContextUtils.h"
#include "WebGLBuffer.h"
#include "WebGLShader.h"
#include "WebGLProgram.h"
#include "WebGLFramebuffer.h"
#include "WebGLRenderbuffer.h"
#include "WebGLTexture.h"
#include "WebGLVertexArray.h"
#include "GLContext.h"
#include "mozilla/dom/ToJSValue.h"
using namespace mozilla;
using namespace dom;
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 char* chars, ErrorResult& rv)
{
JSString* str = JS_NewStringCopyZ(cx, chars);
if (!str) {
rv.Throw(NS_ERROR_OUT_OF_MEMORY);
return JS::NullValue();
}
return JS::StringValue(str);
}
bool
WebGLContext::GetStencilBits(GLint* out_stencilBits)
{
*out_stencilBits = 0;
if (mBoundFramebuffer) {
if (mBoundFramebuffer->HasDepthStencilConflict()) {
// Error, we don't know which stencil buffer's bits to use
ErrorInvalidFramebufferOperation("getParameter: framebuffer has two stencil buffers bound");
return false;
}
if (mBoundFramebuffer->StencilAttachment().IsDefined() ||
mBoundFramebuffer->DepthStencilAttachment().IsDefined())
{
*out_stencilBits = 8;
}
} else if (mOptions.stencil) {
*out_stencilBits = 8;
}
return true;
}
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))
{
if (mBoundFramebuffer) {
GLint iv = 0;
gl->fGetIntegerv(pname, &iv);
return JS::Int32Value(iv);
}
GLint iv = 0;
gl->fGetIntegerv(pname, &iv);
if (iv == GLint(LOCAL_GL_COLOR_ATTACHMENT0 + pname - LOCAL_GL_DRAW_BUFFER0)) {
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) {
if (mBoundVertexArray == mDefaultVertexArray){
return WebGLObjectAsJSValue(cx, (WebGLVertexArray *) nullptr, rv);
}
return WebGLObjectAsJSValue(cx, mBoundVertexArray.get(), rv);
}
}
switch (pname) {
//
// String params
//
case LOCAL_GL_VENDOR:
return StringValue(cx, "Mozilla", rv);
case LOCAL_GL_RENDERER:
return StringValue(cx, "Mozilla", rv);
case LOCAL_GL_VERSION: {
const char* version = 0;
if (IsWebGL2()) {
version = "WebGL 2.0";
} else {
version = "WebGL 1.0";
}
MOZ_ASSERT(version != 0);
return StringValue(cx, version, rv);
}
case LOCAL_GL_SHADING_LANGUAGE_VERSION:
return StringValue(cx, "WebGL GLSL ES 1.0", rv);
// Privileged string params exposed by WEBGL_debug_renderer_info:
case UNMASKED_VENDOR_WEBGL:
case UNMASKED_RENDERER_WEBGL: {
// 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)) {
break;
}
GLenum glstringname = LOCAL_GL_NONE;
if (pname == UNMASKED_VENDOR_WEBGL) {
glstringname = LOCAL_GL_VENDOR;
} else if (pname == UNMASKED_RENDERER_WEBGL) {
glstringname = LOCAL_GL_RENDERER;
}
const char* string = reinterpret_cast<const char*>(gl->fGetString(glstringname));
return StringValue(cx, string, 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: {
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: {
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_ALPHA_BITS:
case LOCAL_GL_DEPTH_BITS: {
GLint i = 0;
gl->fGetIntegerv(pname, &i);
return JS::Int32Value(i);
}
case LOCAL_GL_FRAGMENT_SHADER_DERIVATIVE_HINT: {
if (IsExtensionEnabled(WebGLExtensionID::OES_standard_derivatives)) {
GLint i = 0;
gl->fGetIntegerv(pname, &i);
return JS::Int32Value(i);
} else {
break;
}
}
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 = Uint32Array::Create(cx, this, length, mCompressedTextureFormats.Elements());
if (!obj) {
rv = NS_ERROR_OUT_OF_MEMORY;
}
return JS::ObjectOrNullValue(obj);
}
case LOCAL_GL_MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS: {
if (!IsWebGL2()) {
break;
}
return JS::Int32Value(mGLMaxTransformFeedbackSeparateAttribs);
}
// 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:
case LOCAL_GL_STENCIL_BACK_WRITEMASK:
case LOCAL_GL_STENCIL_VALUE_MASK:
case LOCAL_GL_STENCIL_WRITEMASK: {
GLint i = 0; // the GL api (glGetIntegerv) only does signed ints
gl->fGetIntegerv(pname, &i);
GLuint i_unsigned(i); // this is where -1 becomes 2^32-1
double i_double(i_unsigned); // pass as FP value to allow large values such as 2^32-1.
return JS::DoubleValue(i_double);
}
// float
case LOCAL_GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT: {
if (IsExtensionEnabled(WebGLExtensionID::EXT_texture_filter_anisotropic)) {
GLfloat f = 0.f;
gl->fGetFloatv(pname, &f);
return JS::DoubleValue(f);
} else {
break;
}
}
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 = 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 = 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 = 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 = 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 (!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_TRANSFORM_FEEDBACK_BUFFER_BINDING: {
if (!IsWebGL2()) {
break;
}
return WebGLObjectAsJSValue(cx, mBoundTransformFeedbackBuffer.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);
}
case LOCAL_GL_FRAMEBUFFER_BINDING: {
return WebGLObjectAsJSValue(cx, mBoundFramebuffer.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_SCISSOR_TEST:
return &mScissorTestEnabled;
case LOCAL_GL_DITHER:
return &mDitherEnabled;
case LOCAL_GL_RASTERIZER_DISCARD:
return &mRasterizerDiscardEnabled;
}
return nullptr;
}
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