Hi Rene,
Yvonne Jung wrote:
> if I remember right, Dirk should still have some code for this on his
> computer. Perhaps you can ask him.
>
yes and no. I have versions for OpenGL and instantReality, but not for
OpenSG right now.
The basic idea is to not use stencil but a shader instead. I would just
create two FBOViewports that render into 2 textures. On those you can
use the standard stereo decorator. The actual display viewport just has
a PolygonForeground that interlaces the two images using a simple shader
like the following:
const GLchar *vshader_source="\n\
void main()\n\
{\n\
gl_TexCoord[0]= gl_MultiTexCoord0;\n\
gl_TexCoord[1]= gl_MultiTexCoord1;\n\
gl_Position=ftransform();\n\
}";
const GLchar *fshader_source="\n\
uniform sampler2D left_eye,right_eye;\n\
\n\
void main()\n\
{\n\
vec4 color;\n\
\n\
float x = gl_TexCoord[1].t - floor(gl_TexCoord[1].t);\n\
\n\
if ( x < 0.5) color = texture2D(right_eye,gl_TexCoord[0].st).rgba;\n\
else color = texture2D(left_eye ,gl_TexCoord[0].st).rgba;\n\
\n\
\n\
gl_FragColor = color;\n\
}";
It uses the regular 0..1 texcoords in unit 0 and the window/pixel
coordinate sin 1. You can probably replace that by setting uniforms with
the window size and multiplying by the 0..1 coords to make it fit into a
PolygonForeground.
Hope it helps
Dirk
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