1/* 2 * Copyright (C) 2010 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#include "config.h" 27 28#if ENABLE(ACCELERATED_2D_CANVAS) || USE(3D_GRAPHICS) 29 30#include "DrawingBuffer.h" 31 32#include "Extensions3D.h" 33#include "WebGLLayer.h" 34 35#import "BlockExceptions.h" 36 37namespace WebCore { 38 39DrawingBuffer::DrawingBuffer(GraphicsContext3D* context, 40 const IntSize& size, 41 bool multisampleExtensionSupported, 42 bool packedDepthStencilExtensionSupported, 43 PreserveDrawingBuffer preserveDrawingBuffer, 44 AlphaRequirement alpha) 45 : m_preserveDrawingBuffer(preserveDrawingBuffer) 46 , m_alpha(alpha) 47 , m_scissorEnabled(false) 48 , m_texture2DBinding(0) 49 , m_framebufferBinding(0) 50 , m_activeTextureUnit(GraphicsContext3D::TEXTURE0) 51 , m_context(context) 52 , m_size(-1, -1) 53 , m_multisampleExtensionSupported(multisampleExtensionSupported) 54 , m_packedDepthStencilExtensionSupported(packedDepthStencilExtensionSupported) 55 , m_fbo(context->createFramebuffer()) 56 , m_colorBuffer(0) 57 , m_frontColorBuffer(0) 58 , m_separateFrontTexture(false) 59 , m_depthStencilBuffer(0) 60 , m_depthBuffer(0) 61 , m_stencilBuffer(0) 62 , m_multisampleFBO(0) 63 , m_multisampleColorBuffer(0) 64{ 65 ASSERT(m_fbo); 66 if (!m_fbo) { 67 clear(); 68 return; 69 } 70 71 // Create the WebGLLayer 72 BEGIN_BLOCK_OBJC_EXCEPTIONS 73 m_platformLayer = adoptNS([[WebGLLayer alloc] initWithGraphicsContext3D:m_context.get()]); 74#ifndef NDEBUG 75 [m_platformLayer.get() setName:@"DrawingBuffer Layer"]; 76#endif 77 END_BLOCK_OBJC_EXCEPTIONS 78 79 // create a texture to render into 80 m_colorBuffer = context->createTexture(); 81 context->bindTexture(GraphicsContext3D::TEXTURE_2D, m_colorBuffer); 82 context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MAG_FILTER, GraphicsContext3D::LINEAR); 83 context->texParameterf(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_MIN_FILTER, GraphicsContext3D::LINEAR); 84 context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_S, GraphicsContext3D::CLAMP_TO_EDGE); 85 context->texParameteri(GraphicsContext3D::TEXTURE_2D, GraphicsContext3D::TEXTURE_WRAP_T, GraphicsContext3D::CLAMP_TO_EDGE); 86 context->bindTexture(GraphicsContext3D::TEXTURE_2D, 0); 87 88 createSecondaryBuffers(); 89 reset(size); 90} 91 92DrawingBuffer::~DrawingBuffer() 93{ 94 clear(); 95} 96 97PlatformLayer* DrawingBuffer::platformLayer() 98{ 99 return m_platformLayer.get(); 100} 101 102unsigned DrawingBuffer::frontColorBuffer() const 103{ 104 return colorBuffer(); 105} 106 107} 108 109#endif 110