bool ReadCubeCrossConstructor(FloatPixMapRef sourceImage, RenderFlags flags, SphericalPixelSourceFunction *source, void **context)
{
if (sourceImage == NULL || context == NULL) return false;
ReadCubeContext *cx = malloc(sizeof (ReadCubeContext));
if (cx == NULL) return false;
cx->pm = FPMRetain(sourceImage);
FPMSize totalSize = FPMGetSize(sourceImage);
if (totalSize.width % 4 != 0 || totalSize.height % 3 != 0)
{
fprintf(stderr, "Cross cube map width must be a multiple of four pixels and height must be a multiple of three pixels.\n");
return false;
}
cx->faceSize.width = totalSize.width / 4;
cx->faceSize.height = totalSize.height / 3;
cx->halfWidth = (float)cx->faceSize.width / 2.0;
cx->halfHeight = (float)cx->faceSize.height / 2.0;
cx->maxX = (float)cx->faceSize.width - 1.0f;
cx->maxY = (float)cx->faceSize.height - 1.0f;
cx->pxPos = (FPMPoint){ 2 * cx->faceSize.width, 1 * cx->faceSize.height };
cx->nxPos = (FPMPoint){ 0 * cx->faceSize.width, 1 * cx->faceSize.height };
cx->pyPos = (FPMPoint){ 1 * cx->faceSize.width, 0 * cx->faceSize.height };
cx->nyPos = (FPMPoint){ 1 * cx->faceSize.width, 2 * cx->faceSize.height };
cx->pzPos = (FPMPoint){ 1 * cx->faceSize.width, 1 * cx->faceSize.height };
cx->nzPos = (FPMPoint){ 3 * cx->faceSize.width, 1 * cx->faceSize.height };
*context = cx;
*source = ReadCube;
return true;
}
bool ReadCubeConstructor(FloatPixMapRef sourceImage, RenderFlags flags, void **context)
{
if (sourceImage == NULL || context == NULL) return false;
ReadCubeContext *cx = malloc(sizeof (ReadCubeContext));
if (cx == NULL) return false;
cx->pm = FPMRetain(sourceImage);
FPMSize totalSize = FPMGetSize(sourceImage);
if (totalSize.height % 6 != 0)
{
fprintf(stderr, "Cube map height must be a multiple of six pixels.\n");
return false;
}
cx->faceSize.width = totalSize.width;
cx->faceSize.height = totalSize.height / 6;
cx->halfWidth = (float)cx->faceSize.width / 2.0f;
cx->halfHeight = (float)cx->faceSize.height / 2.0f;
cx->maxX = (float)cx->faceSize.width - 1.0f;
cx->maxY = (float)cx->faceSize.height - 1.0f;
cx->pxPos = (FPMPoint) {
0, 0 * cx->faceSize.height
};
cx->nxPos = (FPMPoint) {
0, 1 * cx->faceSize.height
};
cx->pyPos = (FPMPoint) {
0, 2 * cx->faceSize.height
};
cx->nyPos = (FPMPoint) {
0, 3 * cx->faceSize.height
};
cx->pzPos = (FPMPoint) {
0, 4 * cx->faceSize.height
};
cx->nzPos = (FPMPoint) {
0, 5 * cx->faceSize.height
};
*context = cx;
return true;
}
