/usr/share/psychtoolbox-3/PsychOpenGL/moglCreateFBO.m is in psychtoolbox-3-common 3.0.9+svn2579.dfsg1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | function [fbo , texids] = moglCreateFBO(width, height, nrbuffers, layers, format, withdepth, withstencil)
% [fbo , texids] = moglCreateFBO(width, height [, nrbuffers, layers, format, withdepth, withstencil])
%
% moglCreateFBO creates a standard OpenGL Framebuffer Object, suitable for
% computer vision and other GPGPU tasks and returns a handle to it.
%
% The FBO will have a size of width x height pixels and its 'nrbuffers'
% color buffers will have textures with 'layers' layers (default = 4 for RGBA)
% attached.
% 'format' specifies the data format. It defaults to single precision
% floating point resolution (32 bit float). If 'withdepth' > 0 then a
% depth buffer gets attached as well. If 'withstencil' > 0 then a stencil
% drawable gets attached as well.
%
% The function will create appropriate textures and renderbuffers, create
% an appropriate FBO and attach the textures and renderbuffers. After
% validation, the handle to the FBO is returned.
% History:
% 30.05.2006 Wrote it. (MK)
global GL;
% Child protection:
AssertGLSL;
% Hack, needs to be improved...
if IsLinux
% Redefine vor NVidia:
GL.RGBA_FLOAT32_APPLE = hex2dec('8883');
end;
if nargin < 2
error('Must specify a widht x height of FBO in CreateGLFBO!');
end;
if nargin < 3
nrbuffers = 1;
end;
if isempty(nrbuffers)
nrbuffers = 1;
end;
if nargin < 4
layers = 4;
end;
if isempty(layers)
layers = 4;
end;
if nargin < 5
format = GL.RGBA_FLOAT32_APPLE;
end;
if isempty(format)
format = GL.RGBA_FLOAT32_APPLE;
end;
if nargin < 6
withdepth = 0;
end;
if isempty(withdepth)
withdepth = 0;
end;
if nargin < 7
withstencil = 0;
end;
if isempty(withstencil)
withstencil = 0;
end;
if nrbuffers > glGetIntegerv(GL.MAX_COLOR_ATTACHMENTS_EXT)
error('moglCreateFBO: Sorry this hardware does not support the requested number of color buffers.');
end;
% Enable 2D rectangle textures. Power-of-two textures are known to make
% trouble on many older gfx-cards...
glEnable(GL.TEXTURE_RECTANGLE_EXT);
% Generate texture objects:
texids=glGenTextures(nrbuffers);
% Create a framebuffer object:
fbo = glGenFramebuffersEXT(1);
% Bind fbo:
glBindFramebufferEXT(GL.FRAMEBUFFER_EXT, fbo);
% Create and attach textures as color buffer attachments:
for i=1:nrbuffers
% Enable texture by binding it:
glBindTexture(GL.TEXTURE_RECTANGLE_EXT,texids(i));
% Create representation: A rectangle texture with only mipmap level zero
% and without a border, single precision float, RGBA:
glTexImage2D(GL.TEXTURE_RECTANGLE_EXT, 0, format, width, height, 0, GL.RGBA, GL.FLOAT, 0);
% Setup texture wrapping behaviour to clamp, as other behaviours are
% unsupported on many gfx-cards for rectangle textures:
glTexParameterfv(GL.TEXTURE_RECTANGLE_EXT,GL.TEXTURE_WRAP_S,GL.CLAMP);
glTexParameterfv(GL.TEXTURE_RECTANGLE_EXT,GL.TEXTURE_WRAP_T,GL.CLAMP);
% Setup filtering for the textures - Use nearest neighbour as floating
% point filtering usually unsupported.
glTexParameterfv(GL.TEXTURE_RECTANGLE_EXT,GL.TEXTURE_MAG_FILTER,GL.NEAREST);
glTexParameterfv(GL.TEXTURE_RECTANGLE_EXT,GL.TEXTURE_MIN_FILTER,GL.NEAREST);
% Choose texture application function to be a neutral REPLACE:
glTexEnvfv(GL.TEXTURE_ENV,GL.TEXTURE_ENV_MODE,GL.REPLACE);
% Unbind it after setup:
glBindTexture(GL.TEXTURE_RECTANGLE_EXT, 0);
% Attach textures mipmap level zero as color buffer:
glFramebufferTexture2DEXT(GL.FRAMEBUFFER_EXT, GL.COLOR_ATTACHMENT0_EXT + i - 1, GL.TEXTURE_RECTANGLE_EXT, texids(i), 0);
end;
% Check if FBO is framebuffer complete:
fbostatus = glCheckFramebufferStatusEXT(GL.FRAMEBUFFER_EXT);
if not(fbostatus == GL.FRAMEBUFFER_COMPLETE_EXT)
glDeleteFramebuffersEXT(1, fbo);
glDeleteTextures(length(texids), texids);
fprintf('Error code from framebuffer status call: %i\n', fbostatus);
error('Failed to setup framebuffer object!');
return;
end;
% Unbind it:
glBindFramebufferEXT(GL.FRAMEBUFFER_EXT, 0);
% Done. Return handle to FBO and texture:
return;
|