| /* |
| * 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 "EXTFloatBlend.h" |
| #include "EXTFragDepth.h" |
| #include "EXTShaderTextureLOD.h" |
| #include "EXTTextureCompressionRGTC.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 "KHRParallelShaderCompile.h" |
| #include "OESElementIndexUint.h" |
| #include "OESFBORenderMipmap.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 "WebGLBuffer.h" |
| #include "WebGLColorBufferFloat.h" |
| #include "WebGLCompressedTextureASTC.h" |
| #include "WebGLCompressedTextureATC.h" |
| #include "WebGLCompressedTextureETC.h" |
| #include "WebGLCompressedTextureETC1.h" |
| #include "WebGLCompressedTexturePVRTC.h" |
| #include "WebGLCompressedTextureS3TC.h" |
| #include "WebGLCompressedTextureS3TCsRGB.h" |
| #include "WebGLDebugRendererInfo.h" |
| #include "WebGLDebugShaders.h" |
| #include "WebGLDepthTexture.h" |
| #include "WebGLDrawBuffers.h" |
| #include "WebGLFramebuffer.h" |
| #include "WebGLLoseContext.h" |
| #include "WebGLMultiDraw.h" |
| #include "WebGLProgram.h" |
| #include "WebGLRenderbuffer.h" |
| #include "WebGLSampler.h" |
| #include "WebGLTexture.h" |
| #include "WebGLTransformFeedback.h" |
| #include "WebGLVertexArrayObject.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<GraphicsContextGL>&& 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<GraphicsContextGL>&& context, GraphicsContextGLAttributes attributes) |
| : WebGLRenderingContextBase(canvas, WTFMove(context), attributes) |
| { |
| if (isContextLost()) |
| return; |
| } |
| |
| void WebGLRenderingContext::initializeVertexArrayObjects() |
| { |
| #if !USE(ANGLE) |
| if (!isGLES2Compliant()) |
| initVertexAttrib0(); |
| #endif |
| m_defaultVertexArrayObject = WebGLVertexArrayObjectOES::create(*this, WebGLVertexArrayObjectOES::Type::Default); |
| addContextObject(*m_defaultVertexArrayObject); |
| m_boundVertexArrayObject = m_defaultVertexArrayObject; |
| } |
| |
| 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) ? adoptRef(new 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 = adoptRef(new 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(EXTTextureCompressionRGTC, m_extTextureCompressionRGTC, "EXT_texture_compression_rgtc", enableSupportedExtension("GL_EXT_texture_compression_rgtc"_s)); |
| ENABLE_IF_REQUESTED(KHRParallelShaderCompile, m_khrParallelShaderCompile, "KHR_parallel_shader_compile", KHRParallelShaderCompile::supported(*this)); |
| 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(OESFBORenderMipmap, m_oesFBORenderMipmap, "OES_fbo_render_mipmap", enableSupportedExtension("GL_OES_fbo_render_mipmap"_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(WebGLCompressedTexturePVRTC, m_webglCompressedTexturePVRTC, "WEBGL_compressed_texture_pvrtc", WebGLCompressedTexturePVRTC::supported(*this)); |
| ENABLE_IF_REQUESTED(WebGLCompressedTextureS3TC, m_webglCompressedTextureS3TC, "WEBGL_compressed_texture_s3tc", WebGLCompressedTextureS3TC::supported(*this)); |
| ENABLE_IF_REQUESTED(WebGLCompressedTextureS3TCsRGB, m_webglCompressedTextureS3TCsRGB, "WEBGL_compressed_texture_s3tc_srgb", WebGLCompressedTextureS3TCsRGB::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 = adoptRef(new 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 = adoptRef(new 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(EXTFloatBlend, m_extFloatBlend, "EXT_float_blend", EXTFloatBlend::supported(*this)); |
| ENABLE_IF_REQUESTED(WebGLColorBufferFloat, m_webglColorBufferFloat, "WEBGL_color_buffer_float", WebGLColorBufferFloat::supported(*this)); |
| ENABLE_IF_REQUESTED(WebGLMultiDraw, m_webglMultiDraw, "WEBGL_multi_draw", WebGLMultiDraw::supported(*this)); |
| return nullptr; |
| } |
| |
| std::optional<Vector<String>> WebGLRenderingContext::getSupportedExtensions() |
| { |
| if (isContextLost()) |
| return std::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_compression_rgtc"_s)) |
| result.append("EXT_texture_compression_rgtc"_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); |
| if (m_context->getExtensions().supports("GL_OES_fbo_render_mipmap"_s)) |
| result.append("OES_fbo_render_mipmap"_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); |
| result.append("WEBGL_compressed_texture_pvrtc"_s); |
| } |
| if (WebGLCompressedTextureS3TC::supported(*this)) |
| result.append("WEBGL_compressed_texture_s3tc"_s); |
| if (WebGLCompressedTextureS3TCsRGB::supported(*this)) |
| result.append("WEBGL_compressed_texture_s3tc_srgb"_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 (EXTFloatBlend::supported(*this)) |
| result.append("EXT_float_blend"_s); |
| if (WebGLColorBufferFloat::supported(*this)) |
| result.append("WEBGL_color_buffer_float"_s); |
| if (KHRParallelShaderCompile::supported(*this)) |
| result.append("KHR_parallel_shader_compile"); |
| if (WebGLMultiDraw::supported(*this)) |
| result.append("WEBGL_multi_draw"_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; |
| } |
| |
| #if ENABLE(WEBXR) |
| if (m_framebufferBinding->isOpaque()) { |
| synthesizeGLError(GraphicsContextGL::INVALID_OPERATION, "getFramebufferAttachmentParameter", "An opaque framebuffer's attachments cannot be inspected or changed"); |
| return nullptr; |
| } |
| #endif |
| |
| RefPtr object = 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 static_pointer_cast<WebGLTexture>(object); |
| case GraphicsContextGL::FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL: |
| case GraphicsContextGL::FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE: |
| case ExtensionsGL::FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT: |
| return m_context->getFramebufferAttachmentParameteri(target, attachment, pname); |
| 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 static_pointer_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; |
| } |
| } |
| } |
| |
| GCGLint WebGLRenderingContext::getMaxDrawBuffers() |
| { |
| if (!supportsDrawBuffers()) |
| return 0; |
| if (!m_maxDrawBuffers) |
| m_maxDrawBuffers = m_context->getInteger(ExtensionsGL::MAX_DRAW_BUFFERS_EXT); |
| if (!m_maxColorAttachments) |
| m_maxColorAttachments = m_context->getInteger(ExtensionsGL::MAX_COLOR_ATTACHMENTS_EXT); |
| // 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_maxColorAttachments = m_context->getInteger(ExtensionsGL::MAX_COLOR_ATTACHMENTS_EXT); |
| 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); |
| |
| std::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; |
| } |
| } |
| |
| } // namespace WebCore |
| |
| #endif // ENABLE(WEBGL) |
