static void
init(void)
{
GLint i, j;
GLfloat f;
glIndexFuncSGIptr = (void *) wglGetProcAddress("glIndexFuncSGI");
if (!glIndexFuncSGIptr) {
printf("Note: renderer doesn't support GL_SGI_index_func extension.\n");
}
setPaletteIndex( 10, 0.0F, 0.5F, 0.5F );
glClearIndex( 10.0f );
for (i=11;i<240;i++) {
GLfloat t = (GLfloat) (i-11) / (GLfloat) (240-11);
setPaletteIndex( i, t, t, 0.0F );
}
Image = (GLubyte *) malloc( 32*32*sizeof(GLubyte) );
for (i = 0; i < 32; i++)
for (j = 0; j < 32; j++) {
double d;
d = sqrt((i - 16) * (i - 16) + (j - 16) * (j - 16)) / 23.0;
Image[(32 * i) + j] = 11 + (int)((240 - 11) * d);
}
#ifdef GL_SGI_index_func
if (glIndexFuncSGIptr) {
/* Sanity checks */
glEnable( GL_INDEX_TEST_SGI );
(*glIndexFuncSGIptr)( GL_GEQUAL, 10.0F );
glPushAttrib( GL_COLOR_BUFFER_BIT );
glDisable( GL_INDEX_TEST_SGI );
(*glIndexFuncSGIptr)( GL_LESS, 99.0F );
glPopAttrib();
assert( glIsEnabled(GL_INDEX_TEST_SGI) );
glGetIntegerv( GL_INDEX_TEST_FUNC_SGI, &i );
assert( i==GL_GEQUAL );
glGetFloatv( GL_INDEX_TEST_REF_SGI, &f );
assert( f==10.0f );
}
#endif
checkError("after init");
}
void init_cmap(void)
{
int ii, jj, color;
GLfloat r0, g0, b0, r1, g1, b1;
/* Set up color map */
color = 10;
memset(pal,0,sizeof(pal));
/* Sky colors */
sky_base = color;
r0 = SKY_R; r1 = 1.0f;
g0 = SKY_G; g1 = 1.0f;
b0 = SKY_B; b1 = 1.0f;
for (ii = 0; ii < SKY_COLORS; ii++) {
GLfloat p, r, g, b;
p = (GLfloat) ii / (SKY_COLORS-1);
r = r0 + p * (r1 - r0);
g = g0 + p * (g1 - g0);
b = b0 + p * (b1 - b0);
for (jj = 0; jj < FOG_LEVELS; jj++) {
GLfloat fp, fr, fg, fb;
fp = (FOG_LEVELS > 1) ? (GLfloat) jj / (FOG_LEVELS-1) : 0.0f;
fr = r + fp * (fog_params[0] - r);
fg = g + fp * (fog_params[1] - g);
fb = b + fp * (fog_params[2] - b);
setPaletteIndex(sky_base + (ii*FOG_LEVELS) + jj, fr, fg, fb);
}
}
color += (SKY_COLORS * FOG_LEVELS);
/* Terrain colors */
terr_base = color;
r0 = TERR_DARK_R; r1 = TERR_LITE_R;
g0 = TERR_DARK_G; g1 = TERR_LITE_G;
b0 = TERR_DARK_B; b1 = TERR_LITE_B;
for (ii = 0; ii < TERR_COLORS; ii++) {
GLfloat p, r, g, b;
p = (GLfloat) ii / (TERR_COLORS-1);
r = r0 + p * (r1 - r0);
g = g0 + p * (g1 - g0);
b = b0 + p * (b1 - b0);
for (jj = 0; jj < FOG_LEVELS; jj++) {
GLfloat fp, fr, fg, fb;
fp = (FOG_LEVELS > 1) ? (GLfloat) jj / (FOG_LEVELS-1) : 0.0f;
fr = r + fp * (fog_params[0] - r);
fg = g + fp * (fog_params[1] - g);
fb = b + fp * (fog_params[2] - b);
setPaletteIndex(terr_base + (ii*FOG_LEVELS) + jj, fr, fg, fb);
}
}
color += (TERR_COLORS * FOG_LEVELS);
/* Plane colors */
plane_colors[0] = color;
plane_colors[1] = color + (PLANE_COLORS/2);
plane_colors[2] = color + (PLANE_COLORS-1);
r0 = 0.4; r1 = 0.8;
g0 = 0.4; g1 = 0.8;
b0 = 0.1; b1 = 0.1;
for (ii = 0; ii < PLANE_COLORS; ii++) {
GLfloat p, r, g, b;
p = (GLfloat) ii / (PLANE_COLORS);
r = r0 + p * (r1 - r0);
g = g0 + p * (g1 - g0);
b = b0 + p * (b1 - b0);
setPaletteIndex(plane_colors[0] + ii, r, g, b);
}
color += PLANE_COLORS;
#if 0
GM_setPalette(pal,256,0);
GM_realizePalette(256,0,true);
#endif
}
