1/*
2 * Copyright (C) 2010 Google 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 *
8 * 1.  Redistributions of source code must retain the above copyright
9 *     notice, this list of conditions and the following disclaimer.
10 * 2.  Redistributions in binary form must reproduce the above copyright
11 *     notice, this list of conditions and the following disclaimer in the
12 *     documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
17 * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
18 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
19 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
20 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
21 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef Extensions3D_h
27#define Extensions3D_h
28
29#include "GraphicsTypes3D.h"
30
31#include <wtf/text/WTFString.h>
32
33namespace WebCore {
34
35// This is a base class containing only pure virtual functions.
36// Implementations must provide a subclass.
37//
38// The supported extensions are defined below and in subclasses,
39// possibly platform-specific ones.
40//
41// Calling any extension function not supported by the current context
42// must be a no-op; in particular, it may not have side effects. In
43// this situation, if the function has a return value, 0 is returned.
44class Extensions3D {
45public:
46    virtual ~Extensions3D() {}
47
48    // Supported extensions:
49    //   GL_EXT_texture_format_BGRA8888
50    //   GL_EXT_read_format_bgra
51    //   GL_ARB_robustness
52    //   GL_ARB_texture_non_power_of_two / GL_OES_texture_npot
53    //   GL_EXT_packed_depth_stencil / GL_OES_packed_depth_stencil
54    //   GL_ANGLE_framebuffer_blit / GL_ANGLE_framebuffer_multisample
55    //   GL_OES_texture_float
56    //   GL_OES_standard_derivatives
57    //   GL_OES_rgb8_rgba8
58    //   GL_OES_vertex_array_object
59
60    // Takes full name of extension; for example,
61    // "GL_EXT_texture_format_BGRA8888".
62    virtual bool supports(const String&) = 0;
63
64    // Certain OpenGL and WebGL implementations may support enabling
65    // extensions lazily. This method may only be called with
66    // extension names for which supports returns true.
67    virtual void ensureEnabled(const String&) = 0;
68
69    // Takes full name of extension: for example, "GL_EXT_texture_format_BGRA8888".
70    // Checks to see whether the given extension is actually enabled (see ensureEnabled).
71    // Has no other side-effects.
72    virtual bool isEnabled(const String&) = 0;
73
74    enum ExtensionsEnumType {
75        // GL_EXT_texture_format_BGRA8888 enums
76        BGRA_EXT = 0x80E1,
77
78        // GL_ARB_robustness enums
79        GUILTY_CONTEXT_RESET_ARB = 0x8253,
80        INNOCENT_CONTEXT_RESET_ARB = 0x8254,
81        UNKNOWN_CONTEXT_RESET_ARB = 0x8255,
82
83        // GL_EXT/OES_packed_depth_stencil enums
84        DEPTH24_STENCIL8 = 0x88F0,
85
86        // GL_ANGLE_framebuffer_blit names
87        READ_FRAMEBUFFER = 0x8CA8,
88        DRAW_FRAMEBUFFER = 0x8CA9,
89        DRAW_FRAMEBUFFER_BINDING = 0x8CA6,
90        READ_FRAMEBUFFER_BINDING = 0x8CAA,
91
92        // GL_ANGLE_framebuffer_multisample names
93        RENDERBUFFER_SAMPLES = 0x8CAB,
94        FRAMEBUFFER_INCOMPLETE_MULTISAMPLE = 0x8D56,
95        MAX_SAMPLES = 0x8D57,
96
97        // GL_OES_standard_derivatives names
98        FRAGMENT_SHADER_DERIVATIVE_HINT_OES = 0x8B8B,
99
100        // GL_OES_rgb8_rgba8 names
101        RGB8_OES = 0x8051,
102        RGBA8_OES = 0x8058,
103
104        // GL_OES_vertex_array_object names
105        VERTEX_ARRAY_BINDING_OES = 0x85B5,
106    };
107
108    // GL_ARB_robustness
109    virtual int getGraphicsResetStatusARB() = 0;
110
111    // GL_ANGLE_framebuffer_blit
112    virtual void blitFramebuffer(long srcX0, long srcY0, long srcX1, long srcY1, long dstX0, long dstY0, long dstX1, long dstY1, unsigned long mask, unsigned long filter) = 0;
113
114    // GL_ANGLE_framebuffer_multisample
115    virtual void renderbufferStorageMultisample(unsigned long target, unsigned long samples, unsigned long internalformat, unsigned long width, unsigned long height) = 0;
116
117    // GL_OES_vertex_array_object
118    virtual Platform3DObject createVertexArrayOES() = 0;
119    virtual void deleteVertexArrayOES(Platform3DObject) = 0;
120    virtual GC3Dboolean isVertexArrayOES(Platform3DObject) = 0;
121    virtual void bindVertexArrayOES(Platform3DObject) = 0;
122};
123
124} // namespace WebCore
125
126#endif // Extensions3D_h
127