b311480e |
1 | // Created by: Kirill GAVRILOV |
973c2be1 |
2 | // Copyright (c) 2011-2014 OPEN CASCADE SAS |
b311480e |
3 | // |
973c2be1 |
4 | // This file is part of Open CASCADE Technology software library. |
b311480e |
5 | // |
d5f74e42 |
6 | // This library is free software; you can redistribute it and/or modify it under |
7 | // the terms of the GNU Lesser General Public License version 2.1 as published |
973c2be1 |
8 | // by the Free Software Foundation, with special exception defined in the file |
9 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
10 | // distribution for complete text of the license and disclaimer of any warranty. |
b311480e |
11 | // |
973c2be1 |
12 | // Alternatively, this file may be used under the terms of Open CASCADE |
13 | // commercial license or contractual agreement. |
b311480e |
14 | |
7fd59977 |
15 | #include <OpenGl_FrameBuffer.hxx> |
01ca42b2 |
16 | #include <OpenGl_ArbFBO.hxx> |
7fd59977 |
17 | |
fd4a6963 |
18 | #include <Standard_Assert.hxx> |
19 | |
20 | IMPLEMENT_STANDARD_HANDLE (OpenGl_FrameBuffer, OpenGl_Resource) |
21 | IMPLEMENT_STANDARD_RTTIEXT(OpenGl_FrameBuffer, OpenGl_Resource) |
7fd59977 |
22 | |
7fd59977 |
23 | static inline bool isOddNumber (const GLsizei theNumber) |
24 | { |
25 | return theNumber & 0x01; |
26 | } |
27 | |
28 | static inline GLsizei getEvenNumber (const GLsizei theNumber) |
29 | { |
30 | return isOddNumber (theNumber) ? (theNumber + 1) : theNumber; |
31 | } |
32 | |
33 | //! Notice - 0 is not power of two here |
34 | static inline bool isPowerOfTwo (const GLsizei theNumber) |
35 | { |
18f4e8e2 |
36 | return !(theNumber & (theNumber - 1)); |
7fd59977 |
37 | } |
38 | |
fd4a6963 |
39 | // ======================================================================= |
40 | // function : OpenGl_FrameBuffer |
41 | // purpose : |
42 | // ======================================================================= |
7fd59977 |
43 | OpenGl_FrameBuffer::OpenGl_FrameBuffer (GLint theTextureFormat) |
18f4e8e2 |
44 | : myVPSizeX (0), |
7fd59977 |
45 | myVPSizeY (0), |
46 | myTextFormat (theTextureFormat), |
7fd59977 |
47 | myGlFBufferId (NO_FRAMEBUFFER), |
18f4e8e2 |
48 | myColorTexture (new OpenGl_Texture()), |
49 | myDepthStencilTexture (new OpenGl_Texture()) |
7fd59977 |
50 | { |
51 | // |
52 | } |
53 | |
fd4a6963 |
54 | // ======================================================================= |
55 | // function : ~OpenGl_FrameBuffer |
56 | // purpose : |
57 | // ======================================================================= |
58 | OpenGl_FrameBuffer::~OpenGl_FrameBuffer() |
59 | { |
60 | Release (NULL); |
61 | } |
62 | |
63 | // ======================================================================= |
64 | // function : Init |
65 | // purpose : |
66 | // ======================================================================= |
2166f0fa |
67 | Standard_Boolean OpenGl_FrameBuffer::Init (const Handle(OpenGl_Context)& theGlContext, |
fd4a6963 |
68 | const GLsizei theViewportSizeX, |
18f4e8e2 |
69 | const GLsizei theViewportSizeY) |
7fd59977 |
70 | { |
01ca42b2 |
71 | if (theGlContext->arbFBO == NULL) |
7fd59977 |
72 | { |
7fd59977 |
73 | return Standard_False; |
74 | } |
75 | |
76 | // clean up previous state |
fd4a6963 |
77 | Release (theGlContext.operator->()); |
7fd59977 |
78 | |
7fd59977 |
79 | // setup viewport sizes as is |
80 | myVPSizeX = theViewportSizeX; |
81 | myVPSizeY = theViewportSizeY; |
82 | |
18f4e8e2 |
83 | // Create the textures (will be used as color buffer and depth-stencil buffer) |
84 | if (!initTrashTextures (theGlContext)) |
7fd59977 |
85 | { |
fd4a6963 |
86 | Release (theGlContext.operator->()); |
7fd59977 |
87 | return Standard_False; |
88 | } |
89 | |
7fd59977 |
90 | // Build FBO and setup it as texture |
01ca42b2 |
91 | theGlContext->arbFBO->glGenFramebuffers (1, &myGlFBufferId); |
92 | theGlContext->arbFBO->glBindFramebuffer (GL_FRAMEBUFFER, myGlFBufferId); |
18f4e8e2 |
93 | theGlContext->arbFBO->glFramebufferTexture2D (GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, |
94 | GL_TEXTURE_2D, myColorTexture->TextureId(), 0); |
95 | theGlContext->arbFBO->glFramebufferTexture2D (GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, |
96 | GL_TEXTURE_2D, myDepthStencilTexture->TextureId(), 0); |
01ca42b2 |
97 | if (theGlContext->arbFBO->glCheckFramebufferStatus (GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) |
7fd59977 |
98 | { |
fd4a6963 |
99 | Release (theGlContext.operator->()); |
7fd59977 |
100 | return Standard_False; |
101 | } |
102 | |
18f4e8e2 |
103 | UnbindBuffer (theGlContext); |
7fd59977 |
104 | return Standard_True; |
105 | } |
106 | |
fd4a6963 |
107 | // ======================================================================= |
108 | // function : Release |
109 | // purpose : |
110 | // ======================================================================= |
10b9c7df |
111 | void OpenGl_FrameBuffer::Release (OpenGl_Context* theGlCtx) |
7fd59977 |
112 | { |
18f4e8e2 |
113 | if (isValidFrameBuffer()) |
7fd59977 |
114 | { |
fd4a6963 |
115 | // application can not handle this case by exception - this is bug in code |
116 | Standard_ASSERT_RETURN (theGlCtx != NULL, |
117 | "OpenGl_FrameBuffer destroyed without GL context! Possible GPU memory leakage...",); |
fd4a6963 |
118 | if (theGlCtx->IsValid()) |
2166f0fa |
119 | { |
01ca42b2 |
120 | theGlCtx->arbFBO->glDeleteFramebuffers (1, &myGlFBufferId); |
2166f0fa |
121 | } |
fd4a6963 |
122 | myGlFBufferId = NO_FRAMEBUFFER; |
7fd59977 |
123 | } |
7fd59977 |
124 | |
18f4e8e2 |
125 | myColorTexture->Release (theGlCtx); |
126 | myDepthStencilTexture->Release (theGlCtx); |
7fd59977 |
127 | } |
128 | |
fd4a6963 |
129 | // ======================================================================= |
130 | // function : initTrashTexture |
131 | // purpose : |
132 | // ======================================================================= |
18f4e8e2 |
133 | Standard_Boolean OpenGl_FrameBuffer::initTrashTextures (const Handle(OpenGl_Context)& theGlContext) |
7fd59977 |
134 | { |
18f4e8e2 |
135 | return myColorTexture->Init (theGlContext, myTextFormat, |
136 | GL_RGBA, GL_UNSIGNED_BYTE, |
137 | myVPSizeX, myVPSizeY, Graphic3d_TOT_2D) |
138 | && myDepthStencilTexture->Init (theGlContext, GL_DEPTH24_STENCIL8, |
139 | GL_DEPTH_STENCIL, GL_UNSIGNED_INT_24_8, |
140 | myVPSizeX, myVPSizeY, Graphic3d_TOT_2D); |
7fd59977 |
141 | } |
fd4a6963 |
142 | |
143 | // ======================================================================= |
144 | // function : SetupViewport |
145 | // purpose : |
146 | // ======================================================================= |
147 | void OpenGl_FrameBuffer::SetupViewport (const Handle(OpenGl_Context)& /*theGlCtx*/) |
148 | { |
149 | glViewport (0, 0, myVPSizeX, myVPSizeY); |
150 | } |
151 | |
152 | // ======================================================================= |
153 | // function : ChangeViewport |
154 | // purpose : |
155 | // ======================================================================= |
156 | void OpenGl_FrameBuffer::ChangeViewport (const GLsizei theVPSizeX, |
157 | const GLsizei theVPSizeY) |
158 | { |
159 | myVPSizeX = theVPSizeX; |
160 | myVPSizeY = theVPSizeY; |
161 | } |
162 | |
163 | // ======================================================================= |
164 | // function : BindBuffer |
165 | // purpose : |
166 | // ======================================================================= |
167 | void OpenGl_FrameBuffer::BindBuffer (const Handle(OpenGl_Context)& theGlCtx) |
168 | { |
01ca42b2 |
169 | theGlCtx->arbFBO->glBindFramebuffer (GL_FRAMEBUFFER, myGlFBufferId); |
fd4a6963 |
170 | } |
171 | |
172 | // ======================================================================= |
173 | // function : UnbindBuffer |
174 | // purpose : |
175 | // ======================================================================= |
176 | void OpenGl_FrameBuffer::UnbindBuffer (const Handle(OpenGl_Context)& theGlCtx) |
177 | { |
01ca42b2 |
178 | theGlCtx->arbFBO->glBindFramebuffer (GL_FRAMEBUFFER, NO_FRAMEBUFFER); |
fd4a6963 |
179 | } |