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