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