6 extern int kContextWidth;
7 extern int kContextHeight;
9 bool CanInitStereo(StereoMode mode) {
10 GLint stencilbits = 0;
19 case stereoHorizontalInterlaced:
20 case stereoVerticalInterlaced:
21 glGetIntegerv(GL_STENCIL_BITS, &stencilbits);
22 if ( stencilbits < 1 ) {
23 fprintf(stderr, "Failed to get a stencil buffer, interlaced stereo not available.\n");
26 fprintf(stderr, "Stencil buffer has %i bits, good.\n", stencilbits);
36 void InitStereo(StereoMode mode) {
39 glDisable( GL_STENCIL_TEST);
42 glDisable( GL_STENCIL_TEST);
44 case stereoHorizontalInterlaced:
45 case stereoVerticalInterlaced:
47 fprintf(stderr, "Screen width is %i, height is %i\n", kContextWidth, kContextHeight);
49 // Setup stencil buffer
50 glEnable( GL_STENCIL_TEST);
52 glClear( GL_STENCIL_BUFFER_BIT );
53 glStencilFunc(GL_ALWAYS, 0x1, 0x1);
54 glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
57 glViewport(0,0, kContextWidth, kContextHeight);
58 glMatrixMode(GL_PROJECTION);
61 glOrtho((GLdouble)0, (GLdouble)kContextWidth, (GLdouble)kContextHeight, 0, -1, 1);
62 glMatrixMode(GL_MODELVIEW);
66 glColorMask( GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE );
68 if ( mode == stereoHorizontalInterlaced ) {
69 for(int y=0;y<kContextHeight;y+=2) {
72 glVertex3f(kContextWidth, y, 0);
76 for(int x=0;x<kContextWidth;x+=2) {
79 glVertex3f(x, kContextHeight, 0);
84 glColorMask( GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE );
87 glMatrixMode(GL_PROJECTION);
90 glStencilFunc(GL_NOTEQUAL, 0x01, 0x01);
91 glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
96 const char* StereoModeName(StereoMode mode) {
98 case stereoNone: return "None"; break;
99 case stereoAnaglyph: return "Anaglyph"; break;
100 case stereoHorizontalInterlaced: return "Horizontal interlacing"; break;
101 case stereoVerticalInterlaced: return "Vertical interlacing"; break;
102 case stereoHorizontalSplit: return "Horizontal split"; break;
103 case stereoVerticalSplit: return "Vertical split"; break;
104 case stereoOpenGL: return "OpenGL"; break;
105 default: return "(error)"; break;