static unsigned int
load_shader (GLuint type,
const char *filename)
{
unsigned int shader_num = 0;
char program_data [8000];
FILE *f;
unsigned int len;
f = fopen (filename, "r");
len = fread (program_data, 1, 8000, f);
program_data [len] = '\0';
fclose (f);
glEnable (type);
_glGenProgramsARB (1, &shader_num);
_glBindProgramARB (type, shader_num);
_glProgramStringARB (type, GL_PROGRAM_FORMAT_ASCII_ARB,
strlen (program_data), (const GLbyte *) program_data);
glDisable(type);
return shader_num;
}
static void
draw_video_plane (gdouble center_x,
gdouble center_y,
gdouble start_alpha,
gdouble stop_alpha,
gboolean reversed)
{
glEnable (GL_FRAGMENT_PROGRAM_ARB);
_glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, yuv_shader);
gdouble topy;
gdouble bottomy;
if (! reversed) {
topy = center_y - 1.0;
bottomy = center_y + 1.0;
} else {
topy = center_y + 1.0;
bottomy = center_y - 1.0;
}
glBegin (GL_QUADS);
glColor4f (1.0, 1.0, 1.0, start_alpha);
_glMultiTexCoord2fARB (GL_TEXTURE0_ARB, 0, VIDEO_HEIGHT);
_glMultiTexCoord2fARB (GL_TEXTURE1_ARB, 0, VIDEO_HEIGHT / 2);
_glMultiTexCoord2fARB (GL_TEXTURE2_ARB, 0, VIDEO_HEIGHT / 2);
glVertex2f (center_x - 1.6, topy);
_glMultiTexCoord2fARB (GL_TEXTURE0_ARB, VIDEO_WIDTH, VIDEO_HEIGHT);
_glMultiTexCoord2fARB (GL_TEXTURE1_ARB, VIDEO_WIDTH / 2, VIDEO_HEIGHT / 2);
_glMultiTexCoord2fARB (GL_TEXTURE2_ARB, VIDEO_WIDTH / 2, VIDEO_HEIGHT / 2);
glVertex2f (center_x + 1.6, topy);
glColor4f (1.0, 1.0, 1.0, stop_alpha);
_glMultiTexCoord2fARB (GL_TEXTURE0_ARB, VIDEO_WIDTH, 0);
_glMultiTexCoord2fARB (GL_TEXTURE1_ARB, VIDEO_WIDTH / 2, 0);
_glMultiTexCoord2fARB (GL_TEXTURE2_ARB, VIDEO_WIDTH / 2, 0);
glVertex2f (center_x + 1.6, bottomy);
_glMultiTexCoord2fARB (GL_TEXTURE0_ARB, 0, 0);
_glMultiTexCoord2fARB (GL_TEXTURE1_ARB, 0, 0);
_glMultiTexCoord2fARB (GL_TEXTURE2_ARB, 0, 0);
glVertex2f (center_x - 1.6, bottomy);
glEnd ();
glDisable (GL_FRAGMENT_PROGRAM_ARB);
}
