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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
40using 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
107static 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