blob: 46e2132fd672f297858daa70d917ce712f64fef6 [file] [log] [blame]
/*
* Copyright (C) 2015-2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "WebGLRenderingContext.h"
#if ENABLE(WEBGL)
#include "ANGLEInstancedArrays.h"
#include "CachedImage.h"
#include "EXTBlendMinMax.h"
#include "EXTColorBufferHalfFloat.h"
#include "EXTFragDepth.h"
#include "EXTShaderTextureLOD.h"
#include "EXTTextureFilterAnisotropic.h"
#include "EXTsRGB.h"
#include "ExtensionsGL.h"
#include "HTMLCanvasElement.h"
#include "HTMLImageElement.h"
#include "HTMLVideoElement.h"
#include "ImageData.h"
#include "InspectorInstrumentation.h"
#include "OESElementIndexUint.h"
#include "OESStandardDerivatives.h"
#include "OESTextureFloat.h"
#include "OESTextureFloatLinear.h"
#include "OESTextureHalfFloat.h"
#include "OESTextureHalfFloatLinear.h"
#include "OESVertexArrayObject.h"
#include "RenderBox.h"
#include "RuntimeEnabledFeatures.h"
#include "WebGLColorBufferFloat.h"
#include "WebGLCompressedTextureASTC.h"
#include "WebGLCompressedTextureATC.h"
#include "WebGLCompressedTextureETC.h"
#include "WebGLCompressedTextureETC1.h"
#include "WebGLCompressedTexturePVRTC.h"
#include "WebGLCompressedTextureS3TC.h"
#include "WebGLDebugRendererInfo.h"
#include "WebGLDebugShaders.h"
#include "WebGLDepthTexture.h"
#include "WebGLDrawBuffers.h"
#include "WebGLLoseContext.h"
#include "WebGLVertexArrayObjectOES.h"
#include <JavaScriptCore/GenericTypedArrayViewInlines.h>
#include <JavaScriptCore/HeapInlines.h>
#include <JavaScriptCore/JSCJSValueInlines.h>
#include <JavaScriptCore/JSCellInlines.h>
#include <JavaScriptCore/JSGenericTypedArrayViewInlines.h>
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(WebGLRenderingContext);
std::unique_ptr<WebGLRenderingContext> WebGLRenderingContext::create(CanvasBase& canvas, GraphicsContextGLAttributes attributes)
{
auto renderingContext = std::unique_ptr<WebGLRenderingContext>(new WebGLRenderingContext(canvas, attributes));
// This context is pending policy resolution, so don't call initializeNewContext on it yet.
InspectorInstrumentation::didCreateCanvasRenderingContext(*renderingContext);
return renderingContext;
}
std::unique_ptr<WebGLRenderingContext> WebGLRenderingContext::create(CanvasBase& canvas, Ref<GraphicsContextGLOpenGL>&& context, GraphicsContextGLAttributes attributes)
{
auto renderingContext = std::unique_ptr<WebGLRenderingContext>(new WebGLRenderingContext(canvas, WTFMove(context), attributes));
// This is virtual and can't be called in the constructor.
renderingContext->initializeNewContext();
InspectorInstrumentation::didCreateCanvasRenderingContext(*renderingContext);
return renderingContext;
}
WebGLRenderingContext::WebGLRenderingContext(CanvasBase& canvas, GraphicsContextGLAttributes attributes)
: WebGLRenderingContextBase(canvas, attributes)
{
}
WebGLRenderingContext::WebGLRenderingContext(CanvasBase& canvas, Ref<GraphicsContextGLOpenGL>&& context, GraphicsContextGLAttributes attributes)
: WebGLRenderingContextBase(canvas, WTFMove(context), attributes)
{
if (isContextLost())
return;
}
void WebGLRenderingContext::initializeVertexArrayObjects()
{
m_defaultVertexArrayObject = WebGLVertexArrayObjectOES::create(*this, WebGLVertexArrayObjectOES::Type::Default);
addContextObject(*m_defaultVertexArrayObject);
m_boundVertexArrayObject = m_defaultVertexArrayObject;
#if !USE(ANGLE)
if (!isGLES2Compliant())
initVertexAttrib0();
#endif
}
WebGLExtension* WebGLRenderingContext::getExtension(const String& name)
{
if (isContextLostOrPending())
return nullptr;
#define ENABLE_IF_REQUESTED(type, variable, nameLiteral, canEnable) \
if (equalIgnoringASCIICase(name, nameLiteral)) { \
if (!variable) { \
variable = (canEnable) ? makeUnique<type>(*this) : nullptr; \
if (variable != nullptr) \
InspectorInstrumentation::didEnableExtension(*this, name); \
} \
return variable.get(); \
}
ENABLE_IF_REQUESTED(EXTBlendMinMax, m_extBlendMinMax, "EXT_blend_minmax", enableSupportedExtension("GL_EXT_blend_minmax"_s));
ENABLE_IF_REQUESTED(EXTsRGB, m_extsRGB, "EXT_sRGB", enableSupportedExtension("GL_EXT_sRGB"_s));
ENABLE_IF_REQUESTED(EXTFragDepth, m_extFragDepth, "EXT_frag_depth", enableSupportedExtension("GL_EXT_frag_depth"_s));
if (equalIgnoringASCIICase(name, "EXT_shader_texture_lod")) {
if (!m_extShaderTextureLOD) {
if (!(m_context->getExtensions().supports("GL_EXT_shader_texture_lod"_s) || m_context->getExtensions().supports("GL_ARB_shader_texture_lod"_s)))
m_extShaderTextureLOD = nullptr;
else {
m_context->getExtensions().ensureEnabled("GL_EXT_shader_texture_lod"_s);
m_extShaderTextureLOD = makeUnique<EXTShaderTextureLOD>(*this);
InspectorInstrumentation::didEnableExtension(*this, name);
}
}
return m_extShaderTextureLOD.get();
}
ENABLE_IF_REQUESTED(EXTTextureFilterAnisotropic, m_extTextureFilterAnisotropic, "EXT_texture_filter_anisotropic", enableSupportedExtension("GL_EXT_texture_filter_anisotropic"_s));
ENABLE_IF_REQUESTED(OESStandardDerivatives, m_oesStandardDerivatives, "OES_standard_derivatives", enableSupportedExtension("GL_OES_standard_derivatives"_s));
ENABLE_IF_REQUESTED(OESTextureFloat, m_oesTextureFloat, "OES_texture_float", OESTextureFloat::supported(*this));
ENABLE_IF_REQUESTED(OESTextureFloatLinear, m_oesTextureFloatLinear, "OES_texture_float_linear", enableSupportedExtension("GL_OES_texture_float_linear"_s));
ENABLE_IF_REQUESTED(OESTextureHalfFloat, m_oesTextureHalfFloat, "OES_texture_half_float", OESTextureHalfFloat::supported(*this));
ENABLE_IF_REQUESTED(OESTextureHalfFloatLinear, m_oesTextureHalfFloatLinear, "OES_texture_half_float_linear", enableSupportedExtension("GL_OES_texture_half_float_linear"_s));
ENABLE_IF_REQUESTED(OESVertexArrayObject, m_oesVertexArrayObject, "OES_vertex_array_object", enableSupportedExtension("GL_OES_vertex_array_object"_s));
ENABLE_IF_REQUESTED(OESElementIndexUint, m_oesElementIndexUint, "OES_element_index_uint", enableSupportedExtension("GL_OES_element_index_uint"_s));
ENABLE_IF_REQUESTED(WebGLLoseContext, m_webglLoseContext, "WEBGL_lose_context", true);
ENABLE_IF_REQUESTED(WebGLCompressedTextureASTC, m_webglCompressedTextureASTC, "WEBGL_compressed_texture_astc", WebGLCompressedTextureASTC::supported(*this));
ENABLE_IF_REQUESTED(WebGLCompressedTextureATC, m_webglCompressedTextureATC, "WEBKIT_WEBGL_compressed_texture_atc", WebGLCompressedTextureATC::supported(*this));
ENABLE_IF_REQUESTED(WebGLCompressedTextureETC, m_webglCompressedTextureETC, "WEBGL_compressed_texture_etc", WebGLCompressedTextureETC::supported(*this));
ENABLE_IF_REQUESTED(WebGLCompressedTextureETC1, m_webglCompressedTextureETC1, "WEBGL_compressed_texture_etc1", WebGLCompressedTextureETC1::supported(*this));
ENABLE_IF_REQUESTED(WebGLCompressedTexturePVRTC, m_webglCompressedTexturePVRTC, "WEBKIT_WEBGL_compressed_texture_pvrtc", WebGLCompressedTexturePVRTC::supported(*this));
ENABLE_IF_REQUESTED(WebGLCompressedTextureS3TC, m_webglCompressedTextureS3TC, "WEBGL_compressed_texture_s3tc", WebGLCompressedTextureS3TC::supported(*this));
ENABLE_IF_REQUESTED(WebGLDepthTexture, m_webglDepthTexture, "WEBGL_depth_texture", WebGLDepthTexture::supported(*m_context));
if (equalIgnoringASCIICase(name, "WEBGL_draw_buffers")) {
if (!m_webglDrawBuffers) {
if (!supportsDrawBuffers())
m_webglDrawBuffers = nullptr;
else {
m_context->getExtensions().ensureEnabled("GL_EXT_draw_buffers"_s);
m_webglDrawBuffers = makeUnique<WebGLDrawBuffers>(*this);
InspectorInstrumentation::didEnableExtension(*this, name);
}
}
return m_webglDrawBuffers.get();
}
if (equalIgnoringASCIICase(name, "ANGLE_instanced_arrays")) {
if (!m_angleInstancedArrays) {
if (!ANGLEInstancedArrays::supported(*this))
m_angleInstancedArrays = nullptr;
else {
m_context->getExtensions().ensureEnabled("GL_ANGLE_instanced_arrays"_s);
m_angleInstancedArrays = makeUnique<ANGLEInstancedArrays>(*this);
InspectorInstrumentation::didEnableExtension(*this, name);
}
}
return m_angleInstancedArrays.get();
}
ENABLE_IF_REQUESTED(WebGLDebugRendererInfo, m_webglDebugRendererInfo, "WEBGL_debug_renderer_info", true);
ENABLE_IF_REQUESTED(WebGLDebugShaders, m_webglDebugShaders, "WEBGL_debug_shaders", m_context->getExtensions().supports("GL_ANGLE_translated_shader_source"_s));
ENABLE_IF_REQUESTED(EXTColorBufferHalfFloat, m_extColorBufferHalfFloat, "EXT_color_buffer_half_float", EXTColorBufferHalfFloat::supported(*this));
ENABLE_IF_REQUESTED(WebGLColorBufferFloat, m_webglColorBufferFloat, "WEBGL_color_buffer_float", WebGLColorBufferFloat::supported(*this));
return nullptr;
}
Optional<Vector<String>> WebGLRenderingContext::getSupportedExtensions()
{
if (isContextLost())
return WTF::nullopt;
Vector<String> result;
if (m_isPendingPolicyResolution)
return result;
if (m_context->getExtensions().supports("GL_EXT_blend_minmax"_s))
result.append("EXT_blend_minmax"_s);
if (m_context->getExtensions().supports("GL_EXT_sRGB"_s))
result.append("EXT_sRGB"_s);
if (m_context->getExtensions().supports("GL_EXT_frag_depth"_s))
result.append("EXT_frag_depth"_s);
if (m_context->getExtensions().supports("GL_OES_texture_float"_s))
result.append("OES_texture_float"_s);
if (m_context->getExtensions().supports("GL_OES_texture_float_linear"_s))
result.append("OES_texture_float_linear"_s);
if (m_context->getExtensions().supports("GL_OES_texture_half_float"_s))
result.append("OES_texture_half_float"_s);
if (m_context->getExtensions().supports("GL_OES_texture_half_float_linear"_s))
result.append("OES_texture_half_float_linear"_s);
if (m_context->getExtensions().supports("GL_OES_standard_derivatives"_s))
result.append("OES_standard_derivatives"_s);
if (m_context->getExtensions().supports("GL_EXT_shader_texture_lod"_s) || m_context->getExtensions().supports("GL_ARB_shader_texture_lod"_s))
result.append("EXT_shader_texture_lod"_s);
if (m_context->getExtensions().supports("GL_EXT_texture_filter_anisotropic"_s))
result.append("EXT_texture_filter_anisotropic"_s);
if (m_context->getExtensions().supports("GL_OES_vertex_array_object"_s))
result.append("OES_vertex_array_object"_s);
if (m_context->getExtensions().supports("GL_OES_element_index_uint"_s))
result.append("OES_element_index_uint"_s);
result.append("WEBGL_lose_context"_s);
if (WebGLCompressedTextureASTC::supported(*this))
result.append("WEBGL_compressed_texture_astc"_s);
if (WebGLCompressedTextureATC::supported(*this))
result.append("WEBKIT_WEBGL_compressed_texture_atc"_s);
if (WebGLCompressedTextureETC::supported(*this))
result.append("WEBGL_compressed_texture_etc"_s);
if (WebGLCompressedTextureETC1::supported(*this))
result.append("WEBGL_compressed_texture_etc1"_s);
if (WebGLCompressedTexturePVRTC::supported(*this))
result.append("WEBKIT_WEBGL_compressed_texture_pvrtc"_s);
if (WebGLCompressedTextureS3TC::supported(*this))
result.append("WEBGL_compressed_texture_s3tc"_s);
if (WebGLDepthTexture::supported(*m_context))
result.append("WEBGL_depth_texture"_s);
if (supportsDrawBuffers())
result.append("WEBGL_draw_buffers"_s);
if (ANGLEInstancedArrays::supported(*this))
result.append("ANGLE_instanced_arrays"_s);
if (m_context->getExtensions().supports("GL_ANGLE_translated_shader_source"_s))
result.append("WEBGL_debug_shaders"_s);
result.append("WEBGL_debug_renderer_info"_s);
if (EXTColorBufferHalfFloat::supported(*this))
result.append("EXT_color_buffer_half_float"_s);
if (WebGLColorBufferFloat::supported(*this))
result.append("WEBGL_color_buffer_float"_s);
return result;
}
WebGLAny WebGLRenderingContext::getFramebufferAttachmentParameter(GCGLenum target, GCGLenum attachment, GCGLenum pname)
{
if (isContextLostOrPending() || !validateFramebufferFuncParameters("getFramebufferAttachmentParameter", target, attachment))
return nullptr;
if (!m_framebufferBinding || !m_framebufferBinding->object()) {
synthesizeGLError(GraphicsContextGL::INVALID_OPERATION, "getFramebufferAttachmentParameter", "no framebuffer bound");
return nullptr;
}
auto object = makeRefPtr(m_framebufferBinding->getAttachmentObject(attachment));
if (!object) {
if (pname == GraphicsContextGL::FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE)
return static_cast<unsigned>(GraphicsContextGL::NONE);
// OpenGL ES 2.0 specifies INVALID_ENUM in this case, while desktop GL
// specifies INVALID_OPERATION.
synthesizeGLError(GraphicsContextGL::INVALID_ENUM, "getFramebufferAttachmentParameter", "invalid parameter name");
return nullptr;
}
if (object->isTexture()) {
switch (pname) {
case GraphicsContextGL::FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:
return static_cast<unsigned>(GraphicsContextGL::TEXTURE);
case GraphicsContextGL::FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
return makeRefPtr(reinterpret_cast<WebGLTexture&>(*object));
case GraphicsContextGL::FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL:
case GraphicsContextGL::FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE:
case ExtensionsGL::FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT: {
GCGLint value = 0;
m_context->getFramebufferAttachmentParameteriv(target, attachment, pname, &value);
return value;
}
default:
synthesizeGLError(GraphicsContextGL::INVALID_ENUM, "getFramebufferAttachmentParameter", "invalid parameter name for texture attachment");
return nullptr;
}
} else {
ASSERT(object->isRenderbuffer());
switch (pname) {
case GraphicsContextGL::FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE:
return static_cast<unsigned>(GraphicsContextGL::RENDERBUFFER);
case GraphicsContextGL::FRAMEBUFFER_ATTACHMENT_OBJECT_NAME:
return makeRefPtr(reinterpret_cast<WebGLRenderbuffer&>(*object));
case ExtensionsGL::FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT: {
if (!m_extsRGB) {
synthesizeGLError(GraphicsContextGL::INVALID_ENUM, "getFramebufferAttachmentParameter", "invalid parameter name for renderbuffer attachment");
return nullptr;
}
RefPtr<WebGLRenderbuffer> renderBuffer = reinterpret_cast<WebGLRenderbuffer*>(object.get());
GCGLenum renderBufferFormat = renderBuffer->getInternalFormat();
ASSERT(renderBufferFormat != ExtensionsGL::SRGB_EXT && renderBufferFormat != ExtensionsGL::SRGB_ALPHA_EXT);
if (renderBufferFormat == ExtensionsGL::SRGB8_ALPHA8_EXT)
return static_cast<unsigned>(ExtensionsGL::SRGB_EXT);
return static_cast<unsigned>(GraphicsContextGL::LINEAR);
}
default:
synthesizeGLError(GraphicsContextGL::INVALID_ENUM, "getFramebufferAttachmentParameter", "invalid parameter name for renderbuffer attachment");
return nullptr;
}
}
}
void WebGLRenderingContext::renderbufferStorage(GCGLenum target, GCGLenum internalformat, GCGLsizei width, GCGLsizei height)
{
if (isContextLostOrPending())
return;
if (target != GraphicsContextGL::RENDERBUFFER) {
synthesizeGLError(GraphicsContextGL::INVALID_ENUM, "renderbufferStorage", "invalid target");
return;
}
if (!m_renderbufferBinding || !m_renderbufferBinding->object()) {
synthesizeGLError(GraphicsContextGL::INVALID_OPERATION, "renderbufferStorage", "no bound renderbuffer");
return;
}
if (!validateSize("renderbufferStorage", width, height))
return;
switch (internalformat) {
case GraphicsContextGL::DEPTH_COMPONENT16:
case GraphicsContextGL::RGBA4:
case GraphicsContextGL::RGB5_A1:
case GraphicsContextGL::RGB565:
case GraphicsContextGL::STENCIL_INDEX8:
case ExtensionsGL::SRGB8_ALPHA8_EXT:
if (internalformat == ExtensionsGL::SRGB8_ALPHA8_EXT && !m_extsRGB) {
synthesizeGLError(GraphicsContextGL::INVALID_ENUM, "renderbufferStorage", "invalid internalformat");
return;
}
m_context->renderbufferStorage(target, internalformat, width, height);
m_renderbufferBinding->setInternalFormat(internalformat);
m_renderbufferBinding->setIsValid(true);
m_renderbufferBinding->setSize(width, height);
break;
case GraphicsContextGL::DEPTH_STENCIL:
if (isDepthStencilSupported())
m_context->renderbufferStorage(target, ExtensionsGL::DEPTH24_STENCIL8, width, height);
m_renderbufferBinding->setSize(width, height);
m_renderbufferBinding->setIsValid(isDepthStencilSupported());
m_renderbufferBinding->setInternalFormat(internalformat);
break;
default:
synthesizeGLError(GraphicsContextGL::INVALID_ENUM, "renderbufferStorage", "invalid internalformat");
return;
}
applyStencilTest();
}
void WebGLRenderingContext::hint(GCGLenum target, GCGLenum mode)
{
if (isContextLostOrPending())
return;
bool isValid = false;
switch (target) {
case GraphicsContextGL::GENERATE_MIPMAP_HINT:
isValid = true;
break;
case ExtensionsGL::FRAGMENT_SHADER_DERIVATIVE_HINT_OES: // OES_standard_derivatives
if (m_oesStandardDerivatives)
isValid = true;
break;
}
if (!isValid) {
synthesizeGLError(GraphicsContextGL::INVALID_ENUM, "hint", "invalid target");
return;
}
m_context->hint(target, mode);
}
void WebGLRenderingContext::clear(GCGLbitfield mask)
{
if (isContextLostOrPending())
return;
#if !USE(ANGLE)
if (mask & ~(GraphicsContextGL::COLOR_BUFFER_BIT | GraphicsContextGL::DEPTH_BUFFER_BIT | GraphicsContextGL::STENCIL_BUFFER_BIT)) {
synthesizeGLError(GraphicsContextGL::INVALID_VALUE, "clear", "invalid mask");
return;
}
const char* reason = "framebuffer incomplete";
if (m_framebufferBinding && !m_framebufferBinding->onAccess(m_context.get(), &reason)) {
synthesizeGLError(GraphicsContextGL::INVALID_FRAMEBUFFER_OPERATION, "clear", reason);
return;
}
#endif
if (!clearIfComposited(mask))
m_context->clear(mask);
markContextChangedAndNotifyCanvasObserver();
}
GCGLint WebGLRenderingContext::getMaxDrawBuffers()
{
if (!supportsDrawBuffers())
return 0;
if (!m_maxDrawBuffers)
m_context->getIntegerv(ExtensionsGL::MAX_DRAW_BUFFERS_EXT, &m_maxDrawBuffers);
if (!m_maxColorAttachments)
m_context->getIntegerv(ExtensionsGL::MAX_COLOR_ATTACHMENTS_EXT, &m_maxColorAttachments);
// WEBGL_draw_buffers requires MAX_COLOR_ATTACHMENTS >= MAX_DRAW_BUFFERS.
return std::min(m_maxDrawBuffers, m_maxColorAttachments);
}
GCGLint WebGLRenderingContext::getMaxColorAttachments()
{
if (!supportsDrawBuffers())
return 0;
if (!m_maxColorAttachments)
m_context->getIntegerv(ExtensionsGL::MAX_COLOR_ATTACHMENTS_EXT, &m_maxColorAttachments);
return m_maxColorAttachments;
}
bool WebGLRenderingContext::validateIndexArrayConservative(GCGLenum type, unsigned& numElementsRequired)
{
// Performs conservative validation by caching a maximum index of
// the given type per element array buffer. If all of the bound
// array buffers have enough elements to satisfy that maximum
// index, skips the expensive per-draw-call iteration in
// validateIndexArrayPrecise.
RefPtr<WebGLBuffer> elementArrayBuffer = m_boundVertexArrayObject->getElementArrayBuffer();
if (!elementArrayBuffer)
return false;
GCGLsizeiptr numElements = elementArrayBuffer->byteLength();
// The case count==0 is already dealt with in drawElements before validateIndexArrayConservative.
if (!numElements)
return false;
auto buffer = elementArrayBuffer->elementArrayBuffer();
ASSERT(buffer);
Optional<unsigned> maxIndex = elementArrayBuffer->getCachedMaxIndex(type);
if (!maxIndex) {
// Compute the maximum index in the entire buffer for the given type of index.
switch (type) {
case GraphicsContextGL::UNSIGNED_BYTE: {
const GCGLubyte* p = static_cast<const GCGLubyte*>(buffer->data());
for (GCGLsizeiptr i = 0; i < numElements; i++)
maxIndex = maxIndex ? std::max(maxIndex.value(), static_cast<unsigned>(p[i])) : static_cast<unsigned>(p[i]);
break;
}
case GraphicsContextGL::UNSIGNED_SHORT: {
numElements /= sizeof(GCGLushort);
const GCGLushort* p = static_cast<const GCGLushort*>(buffer->data());
for (GCGLsizeiptr i = 0; i < numElements; i++)
maxIndex = maxIndex ? std::max(maxIndex.value(), static_cast<unsigned>(p[i])) : static_cast<unsigned>(p[i]);
break;
}
case GraphicsContextGL::UNSIGNED_INT: {
if (!m_oesElementIndexUint)
return false;
numElements /= sizeof(GCGLuint);
const GCGLuint* p = static_cast<const GCGLuint*>(buffer->data());
for (GCGLsizeiptr i = 0; i < numElements; i++)
maxIndex = maxIndex ? std::max(maxIndex.value(), static_cast<unsigned>(p[i])) : static_cast<unsigned>(p[i]);
break;
}
default:
return false;
}
if (maxIndex)
elementArrayBuffer->setCachedMaxIndex(type, maxIndex.value());
}
if (!maxIndex)
return false;
// The number of required elements is one more than the maximum index that will be accessed.
auto checkedNumElementsRequired = checkedAddAndMultiply<unsigned>(maxIndex.value(), 1, 1);
if (!checkedNumElementsRequired)
return false;
numElementsRequired = checkedNumElementsRequired.value();
return true;
}
bool WebGLRenderingContext::validateBlendEquation(const char* functionName, GCGLenum mode)
{
switch (mode) {
case GraphicsContextGL::FUNC_ADD:
case GraphicsContextGL::FUNC_SUBTRACT:
case GraphicsContextGL::FUNC_REVERSE_SUBTRACT:
case ExtensionsGL::MIN_EXT:
case ExtensionsGL::MAX_EXT:
if ((mode == ExtensionsGL::MIN_EXT || mode == ExtensionsGL::MAX_EXT) && !m_extBlendMinMax) {
synthesizeGLError(GraphicsContextGL::INVALID_ENUM, functionName, "invalid mode");
return false;
}
return true;
break;
default:
synthesizeGLError(GraphicsContextGL::INVALID_ENUM, functionName, "invalid mode");
return false;
}
}
bool WebGLRenderingContext::validateCapability(const char* functionName, GCGLenum cap)
{
switch (cap) {
case GraphicsContextGL::BLEND:
case GraphicsContextGL::CULL_FACE:
case GraphicsContextGL::DEPTH_TEST:
case GraphicsContextGL::DITHER:
case GraphicsContextGL::POLYGON_OFFSET_FILL:
case GraphicsContextGL::SAMPLE_ALPHA_TO_COVERAGE:
case GraphicsContextGL::SAMPLE_COVERAGE:
case GraphicsContextGL::SCISSOR_TEST:
case GraphicsContextGL::STENCIL_TEST:
return true;
default:
synthesizeGLError(GraphicsContextGL::INVALID_ENUM, functionName, "invalid capability");
return false;
}
}
} // namespace WebCore
#endif // ENABLE(WEBGL)