/usr/share/psychtoolbox-3/PsychOpenGL/moglBlitTexture.m is in psychtoolbox-3-common 3.0.14.20170103+git6-g605ff5c.dfsg1-1build1.
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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 | function moglBlitTexture(texid, x, y, w, h, fastblit, clamping)
% moglBlitTexture(texid, x, y, w, h, fastblit, clamping)
%
% moglBlitTexture blits the OpenGL texture 'texid' at offset (x,y) into the
% current framebuffer. 'w x h' pixels are blitted. By default the offset is
% (0,0), the size is the full size of the texture.
%
% If you set the fastblit - flat to 1, then all other parameters are
% required, all error-checking and texture engine setup is skipped and only
% the minimal amount of code for initiating a blit is performed. This is
% useful in inner loops of GPGPU algorithms to squeeze out more speed!
%
% This does basically the same as Screen('DrawTexture') but without all the
% convenience stuff contained in 'DrawTexture' - and without the possible
% interference of PTB's internal drawing model. This is mostly useful for
% GPGPU and image processing applications where one needs very strict
% control of the way drawing is done. For everything else, use
% Screen('DrawTexture').
%
% Current limitation: Only rectangle textures are supported.
% History:
% 30.5.2006 Wrote it (MK).
global GL;
if nargin >= 6
if isempty(fastblit)
fastblit = 0;
end;
else
fastblit = 0;
end;
% Should we take the fast path?
if fastblit == 0
% Child prot.
AssertGLSL;
if nargin < 1
error('Missing texture id texid.');
end;
% Bind it:
glDisable(GL.TEXTURE_2D);
glEnable(GL.TEXTURE_RECTANGLE_EXT);
glBindTexture(GL.TEXTURE_RECTANGLE_EXT, texid);
% Query size:
tw = glGetTexLevelParameteriv(GL.TEXTURE_RECTANGLE_EXT, 0, GL.TEXTURE_WIDTH);
th = glGetTexLevelParameteriv(GL.TEXTURE_RECTANGLE_EXT, 0, GL.TEXTURE_HEIGHT);
% Setup default size of srcRect:
if nargin < 4
w = tw;
end;
if isempty(w);
w = tw;
end;
if nargin < 5
h = th;
end;
if isempty(h);
h = th;
end;
if w<0 || h<0 || w>tw || h>th
error('Invalid w x h parameter. Negative or bigger than texture size.')
end;
if nargin < 2
x = 0;
end;
if isempty(x)
x = 0;
end;
if nargin < 3
y = 0;
end;
if isempty(y)
y = 0;
end;
if nargin>=7
if ~isempty(clamping)
glTexParameteri(GL.TEXTURE_RECTANGLE_EXT, GL.TEXTURE_WRAP_S, clamping);
glTexParameteri(GL.TEXTURE_RECTANGLE_EXT, GL.TEXTURE_WRAP_T, clamping);
end
end
else
% Fast path:
glBindTexture(GL.TEXTURE_RECTANGLE_EXT, texid);
end;
% Blit it:
glBegin(GL.QUADS)
glTexCoord2f(0, 0);
glVertex2f(x, y);
glTexCoord2f(0, h);
glVertex2f(x, y+h);
glTexCoord2f(w, h);
glVertex2f(x+w, y+h );
glTexCoord2f(w, 0);
glVertex2f(x+w, y);
glEnd;
if fastblit > 0
return;
end;
% Unbind it:
glBindTexture(GL.TEXTURE_RECTANGLE_EXT, 0);
glDisable(GL.TEXTURE_RECTANGLE_EXT);
% Done.
return;
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