1/* 2 * Copyright (C) 2009 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(WEBGL) 29 30#import "WebGLLayer.h" 31 32#import "GraphicsContext3D.h" 33#import "GraphicsLayer.h" 34#if !PLATFORM(IOS) 35#import <OpenGL/OpenGL.h> 36#import <OpenGL/gl.h> 37#endif 38#import <wtf/FastMalloc.h> 39#import <wtf/RetainPtr.h> 40 41using namespace WebCore; 42 43@implementation WebGLLayer 44 45@synthesize context=_context; 46 47-(id)initWithGraphicsContext3D:(GraphicsContext3D*)context 48{ 49 _context = context; 50 self = [super init]; 51 return self; 52} 53 54#if !PLATFORM(IOS) 55-(CGLPixelFormatObj)copyCGLPixelFormatForDisplayMask:(uint32_t)mask 56{ 57 // FIXME: The mask param tells you which display (on a multi-display system) 58 // is to be used. But since we are now getting the pixel format from the 59 // Canvas CGL context, we don't use it. This seems to do the right thing on 60 // one multi-display system. But there may be cases where this is not the case. 61 // If needed we will have to set the display mask in the Canvas CGLContext and 62 // make sure it matches. 63 UNUSED_PARAM(mask); 64 return CGLRetainPixelFormat(CGLGetPixelFormat(_context->platformGraphicsContext3D())); 65} 66 67-(CGLContextObj)copyCGLContextForPixelFormat:(CGLPixelFormatObj)pixelFormat 68{ 69 CGLContextObj contextObj; 70 CGLCreateContext(pixelFormat, _context->platformGraphicsContext3D(), &contextObj); 71 return contextObj; 72} 73 74-(void)drawInCGLContext:(CGLContextObj)glContext pixelFormat:(CGLPixelFormatObj)pixelFormat forLayerTime:(CFTimeInterval)timeInterval displayTime:(const CVTimeStamp *)timeStamp 75{ 76 if (!_context) 77 return; 78 79 _context->prepareTexture(); 80 81 CGLSetCurrentContext(glContext); 82 83 CGRect frame = [self frame]; 84 85 // draw the FBO into the layer 86 glViewport(0, 0, frame.size.width, frame.size.height); 87 glMatrixMode(GL_PROJECTION); 88 glLoadIdentity(); 89 glOrtho(-1, 1, -1, 1, -1, 1); 90 glMatrixMode(GL_MODELVIEW); 91 glLoadIdentity(); 92 93 glEnable(GL_TEXTURE_2D); 94 glBindTexture(GL_TEXTURE_2D, _context->platformTexture()); 95 96 glBegin(GL_TRIANGLE_FAN); 97 glTexCoord2f(0, 0); 98 glVertex2f(-1, -1); 99 glTexCoord2f(1, 0); 100 glVertex2f(1, -1); 101 glTexCoord2f(1, 1); 102 glVertex2f(1, 1); 103 glTexCoord2f(0, 1); 104 glVertex2f(-1, 1); 105 glEnd(); 106 107 glBindTexture(GL_TEXTURE_2D, 0); 108 glDisable(GL_TEXTURE_2D); 109 110 // Call super to finalize the drawing. By default all it does is call glFlush(). 111 [super drawInCGLContext:glContext pixelFormat:pixelFormat forLayerTime:timeInterval displayTime:timeStamp]; 112} 113 114static void freeData(void *, const void *data, size_t /* size */) 115{ 116 fastFree(const_cast<void *>(data)); 117} 118#endif 119 120-(CGImageRef)copyImageSnapshotWithColorSpace:(CGColorSpaceRef)colorSpace 121{ 122 if (!_context) 123 return nullptr; 124 125#if PLATFORM(IOS) 126 UNUSED_PARAM(colorSpace); 127 return nullptr; 128#else 129 CGLSetCurrentContext(_context->platformGraphicsContext3D()); 130 131 RetainPtr<CGColorSpaceRef> imageColorSpace = colorSpace; 132 if (!imageColorSpace) 133 imageColorSpace = adoptCF(CGColorSpaceCreateDeviceRGB()); 134 135 CGRect layerBounds = CGRectIntegral([self bounds]); 136 137 size_t width = layerBounds.size.width; 138 size_t height = layerBounds.size.height; 139 140 size_t rowBytes = (width * 4 + 15) & ~15; 141 size_t dataSize = rowBytes * height; 142 void* data = fastMalloc(dataSize); 143 if (!data) 144 return nullptr; 145 146 glPixelStorei(GL_PACK_ROW_LENGTH, rowBytes / 4); 147 glReadPixels(0, 0, width, height, GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, data); 148 149 CGDataProviderRef provider = CGDataProviderCreateWithData(0, data, dataSize, freeData); 150 CGImageRef image = CGImageCreate(width, height, 8, 32, rowBytes, imageColorSpace.get(), 151 kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Host, 152 provider, 0, true, 153 kCGRenderingIntentDefault); 154 CGDataProviderRelease(provider); 155 return image; 156#endif 157} 158 159- (void)display 160{ 161 if (!_context) 162 return; 163 164#if PLATFORM(IOS) 165 _context->endPaint(); 166#else 167 [super display]; 168#endif 169 _context->markLayerComposited(); 170} 171 172@end 173 174#endif // ENABLE(WEBGL) 175