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gecko-dev/dom/canvas/WebGLContextState.cpp

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/Maybe.h"
#include "mozilla/Preferences.h"
#include "MozFramebuffer.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::SetEnabled(const GLenum cap, const Maybe<GLuint> i,
const bool enabled) {
const FuncScope funcScope(*this, "enable(i)/disable(i)");
if (IsContextLost()) return;
if (!ValidateCapabilityEnum(cap)) return;
if (i) {
if (cap != LOCAL_GL_BLEND) {
ErrorInvalidEnumArg("cap", cap);
return;
}
const auto limit = MaxValidDrawBuffers();
if (*i >= limit) {
ErrorInvalidValue("`index` (%u) must be < %s (%u)", *i,
"MAX_DRAW_BUFFERS", limit);
return;
}
}
const auto slot = GetStateTrackingSlot(cap, i ? *i : 0);
if (slot) {
*slot = enabled;
} else if (cap == LOCAL_GL_BLEND) {
if (i) {
mBlendEnabled[*i] = enabled;
} else {
if (enabled) {
mBlendEnabled.set();
} else {
mBlendEnabled.reset();
}
}
}
switch (cap) {
case LOCAL_GL_DEPTH_TEST:
case LOCAL_GL_STENCIL_TEST:
break; // Lazily applied, so don't tell GL yet or we will desync.
default:
// Non-lazy caps.
if (i) {
if (enabled) {
gl->fEnablei(cap, *i);
} else {
gl->fDisablei(cap, *i);
}
} else {
gl->SetEnabled(cap, enabled);
}
break;
}
}
bool WebGLContext::GetStencilBits(GLint* const out_stencilBits) const {
*out_stencilBits = 0;
if (mBoundDrawFramebuffer) {
if (!mBoundDrawFramebuffer->IsCheckFramebufferStatusComplete()) {
// 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().HasAttachment() ||
mBoundDrawFramebuffer->DepthStencilAttachment().HasAttachment()) {
*out_stencilBits = 8;
}
} else if (mOptions.stencil) {
*out_stencilBits = 8;
}
return true;
}
Maybe<double> WebGLContext::GetParameter(const GLenum pname) {
const FuncScope funcScope(*this, "getParameter");
if (IsContextLost()) return {};
if (IsWebGL2() || IsExtensionEnabled(WebGLExtensionID::WEBGL_draw_buffers)) {
if (pname == LOCAL_GL_MAX_COLOR_ATTACHMENTS) {
return Some(MaxValidDrawBuffers());
} else if (pname == LOCAL_GL_MAX_DRAW_BUFFERS) {
return Some(MaxValidDrawBuffers());
} else if (pname >= LOCAL_GL_DRAW_BUFFER0 &&
pname < GLenum(LOCAL_GL_DRAW_BUFFER0 + MaxValidDrawBuffers())) {
const auto slotId = pname - LOCAL_GL_DRAW_BUFFER0;
GLenum ret = LOCAL_GL_NONE;
if (!mBoundDrawFramebuffer) {
if (slotId == 0) {
ret = mDefaultFB_DrawBuffer0;
}
} else {
const auto& fb = *mBoundDrawFramebuffer;
const auto& bs = fb.DrawBufferEnabled();
if (bs[slotId]) {
ret = LOCAL_GL_COLOR_ATTACHMENT0 + slotId;
}
}
return Some(ret);
}
}
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 Some(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 Some(bool(val));
}
default:
break;
}
}
if (IsWebGL2() ||
IsExtensionEnabled(WebGLExtensionID::OES_standard_derivatives)) {
if (pname == LOCAL_GL_FRAGMENT_SHADER_DERIVATIVE_HINT) {
GLint i = 0;
gl->fGetIntegerv(pname, &i);
return Some(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 Some(f);
}
}
if (IsExtensionEnabled(WebGLExtensionID::MOZ_debug)) {
if (pname == dom::MOZ_debug_Binding::DOES_INDEX_VALIDATION) {
return Some(mNeedsIndexValidation);
}
}
switch (pname) {
////////////////////////////////
// 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 Some(i);
}
case LOCAL_GL_GENERATE_MIPMAP_HINT:
return Some(mGenerateMipmapHint);
case LOCAL_GL_IMPLEMENTATION_COLOR_READ_FORMAT:
case LOCAL_GL_IMPLEMENTATION_COLOR_READ_TYPE: {
const webgl::FormatUsageInfo* usage;
uint32_t width, height;
if (!BindCurFBForColorRead(&usage, &width, &height,
LOCAL_GL_INVALID_OPERATION))
return Nothing();
const auto implPI = ValidImplementationColorReadPI(usage);
GLenum ret;
if (pname == LOCAL_GL_IMPLEMENTATION_COLOR_READ_FORMAT) {
ret = implPI.format;
} else {
ret = implPI.type;
}
return Some(ret);
}
// int
case LOCAL_GL_STENCIL_REF:
case LOCAL_GL_STENCIL_BACK_REF: {
GLint stencilBits = 0;
if (!GetStencilBits(&stencilBits)) return Nothing();
// Assuming stencils have 8 bits
const GLint stencilMask = (1 << stencilBits) - 1;
GLint refValue = 0;
gl->fGetIntegerv(pname, &refValue);
return Some(refValue & stencilMask);
}
case LOCAL_GL_SAMPLE_BUFFERS:
case LOCAL_GL_SAMPLES: {
const auto& fb = mBoundDrawFramebuffer;
auto samples = [&]() -> Maybe<uint32_t> {
if (!fb) {
if (!EnsureDefaultFB()) return Nothing();
return Some(mDefaultFB->mSamples);
}
if (!fb->IsCheckFramebufferStatusComplete()) return Some(0);
DoBindFB(fb, LOCAL_GL_FRAMEBUFFER);
return Some(gl->GetIntAs<uint32_t>(LOCAL_GL_SAMPLES));
}();
if (samples && pname == LOCAL_GL_SAMPLE_BUFFERS) {
samples = Some(uint32_t(bool(samples.value())));
}
if (!samples) return Nothing();
return Some(samples.value());
}
case LOCAL_GL_STENCIL_CLEAR_VALUE:
case LOCAL_GL_SUBPIXEL_BITS: {
GLint i = 0;
gl->fGetIntegerv(pname, &i);
return Some(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: {
const auto format = [&]() -> const webgl::FormatInfo* {
const auto& fb = mBoundDrawFramebuffer;
if (fb) {
if (!fb->IsCheckFramebufferStatusComplete()) return nullptr;
const auto& attachment = [&]() -> const auto& {
switch (pname) {
case LOCAL_GL_DEPTH_BITS:
if (fb->DepthStencilAttachment().HasAttachment())
return fb->DepthStencilAttachment();
return fb->DepthAttachment();
case LOCAL_GL_STENCIL_BITS:
if (fb->DepthStencilAttachment().HasAttachment())
return fb->DepthStencilAttachment();
return fb->StencilAttachment();
default:
return fb->ColorAttachment0();
}
}
();
const auto imageInfo = attachment.GetImageInfo();
if (!imageInfo) return nullptr;
return imageInfo->mFormat->format;
}
auto effFormat = webgl::EffectiveFormat::RGB8;
switch (pname) {
case LOCAL_GL_DEPTH_BITS:
if (mOptions.depth) {
effFormat = webgl::EffectiveFormat::DEPTH24_STENCIL8;
}
break;
case LOCAL_GL_STENCIL_BITS:
if (mOptions.stencil) {
effFormat = webgl::EffectiveFormat::DEPTH24_STENCIL8;
}
break;
default:
if (mOptions.alpha) {
effFormat = webgl::EffectiveFormat::RGBA8;
}
break;
}
return webgl::GetFormat(effFormat);
}();
int32_t ret = 0;
if (format) {
switch (pname) {
case LOCAL_GL_RED_BITS:
ret = format->r;
break;
case LOCAL_GL_GREEN_BITS:
ret = format->g;
break;
case LOCAL_GL_BLUE_BITS:
ret = format->b;
break;
case LOCAL_GL_ALPHA_BITS:
ret = format->a;
break;
case LOCAL_GL_DEPTH_BITS:
ret = format->d;
break;
case LOCAL_GL_STENCIL_BITS:
ret = format->s;
break;
}
}
return Some(ret);
}
case LOCAL_GL_MAX_RENDERBUFFER_SIZE:
return Some(mGLMaxRenderbufferSize);
case LOCAL_GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS:
return Some(mGLMaxVertexTextureImageUnits);
case LOCAL_GL_MAX_TEXTURE_IMAGE_UNITS:
return Some(mGLMaxFragmentTextureImageUnits);
case LOCAL_GL_MAX_VERTEX_UNIFORM_VECTORS:
return Some(mGLMaxVertexUniformVectors);
case LOCAL_GL_MAX_FRAGMENT_UNIFORM_VECTORS:
return Some(mGLMaxFragmentUniformVectors);
case LOCAL_GL_MAX_VARYING_VECTORS:
return Some(mGLMaxFragmentInputVectors);
// 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 Some(mStencilValueMaskBack);
// pass as FP value to allow large values such as 2^32-1.
case LOCAL_GL_STENCIL_BACK_WRITEMASK:
return Some(mStencilWriteMaskBack);
case LOCAL_GL_STENCIL_VALUE_MASK:
return Some(mStencilValueMaskFront);
case LOCAL_GL_STENCIL_WRITEMASK:
return Some(mStencilWriteMaskFront);
case LOCAL_GL_COLOR_WRITEMASK:
return Some(mColorWriteMask0);
// float
case LOCAL_GL_LINE_WIDTH:
return Some((double)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 Some(f);
}
// bool
case LOCAL_GL_DEPTH_TEST:
return Some((bool)mDepthTestEnabled);
case LOCAL_GL_STENCIL_TEST:
return Some((bool)mStencilTestEnabled);
case LOCAL_GL_BLEND:
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_SAMPLE_ALPHA_TO_COVERAGE:
case LOCAL_GL_SAMPLE_COVERAGE:
case LOCAL_GL_DEPTH_WRITEMASK: {
realGLboolean b = 0;
gl->fGetBooleanv(pname, &b);
return Some(bool(b));
}
default:
break;
}
ErrorInvalidEnumInfo("pname", pname);
return Nothing();
}
bool WebGLContext::IsEnabled(GLenum cap) {
const FuncScope funcScope(*this, "isEnabled");
if (IsContextLost()) return false;
if (!ValidateCapabilityEnum(cap)) return false;
const auto& slot = GetStateTrackingSlot(cap, 0);
if (slot) return *slot;
return gl->fIsEnabled(cap);
}
bool WebGLContext::ValidateCapabilityEnum(GLenum cap) {
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("cap", cap);
return false;
}
}
bool* WebGLContext::GetStateTrackingSlot(GLenum cap, GLuint i) {
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
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