void drawPoints(u8 col)
{
if (flatDrawing)
{
Vect2D_s16 v[4];
const Vect3D_f16 *norm;
const u16 *poly_ind;
u16 i;
norm = cube_face_norm;
poly_ind = cube_poly_ind;
i = 6;
while (i--)
{
Vect2D_s16 *pt_dst = v;
fix16 dp;
u8 col = 2;
*pt_dst++ = pts_2D[*poly_ind++];
*pt_dst++ = pts_2D[*poly_ind++];
*pt_dst++ = pts_2D[*poly_ind++];
*pt_dst = pts_2D[*poly_ind++];
dp = fix16Mul(transformation.lightInv.x, norm->x) +
fix16Mul(transformation.lightInv.y, norm->y) +
fix16Mul(transformation.lightInv.z, norm->z);
norm++;
if (dp > 0) col += (dp >> (FIX16_FRAC_BITS - 2));
if (!BMP_isPolygonCulled(v, 4))
BMP_drawPolygon(v, 4, col);
}
}
else
{
/* Polygon sort, 3D->2D projection, polygon drawing */
void inline drawPoints(u8 col)
{
Vect2D_s16 v[4];
const Vect3D_f16 *norm;
const short *poly_ind;
u16 i, j;
fix16 z_sum;
norm = mesh_face_norm;
poly_ind = mesh_poly_ind;
// Depth sort the polygons
if (zsort_switch == 0)
{
// Feed an index table with the sum of the Z coordinate
// of each polygon in the current mesh
for(i = 0; i < poly_count; i++)
{
j = i << 2;
poly_zsort[i].index = i;
/* Is it a quad or a triangle ? */
if (poly_ind[j+3] != -1)
z_sum = fix16Add(fix16Add(pts_3D[poly_ind[j]].z, pts_3D[poly_ind[j+1]].z), fix16Add(pts_3D[poly_ind[j+2]].z, pts_3D[poly_ind[j+3]].z));
else
z_sum = fix16Add(fix16Add(pts_3D[poly_ind[j]].z, pts_3D[poly_ind[j+1]].z), pts_3D[poly_ind[j+2]].z);
poly_zsort[i].value = z_sum;
}
// Quicksort the table and order the polygons by depth
QuickSort(poly_count, poly_zsort);
}
// Count 16 frames until the next depth sort
zsort_switch++;
zsort_switch &= 0xF;
// Draws the polygons
i = poly_count;
while(i--)
{
Vect2D_s16 *pt_dst = v;
fix16 dp;
u8 col = 2;
poly_ind = &mesh_poly_ind[poly_zsort[i].index << 2];
/* Is it a quad or a triangle ? */
if (*(poly_ind + 3) != -1)
{
*pt_dst++ = pts_2D[*poly_ind++];
*pt_dst++ = pts_2D[*poly_ind++];
*pt_dst++ = pts_2D[*poly_ind++];
*pt_dst = pts_2D[*poly_ind++];
// If the polygon is facing the camera
if (!BMP_isPolygonCulled(v, 4))
{
// Compute the lighting of the polygon
norm = &mesh_face_norm[poly_zsort[i].index];
dp = fix16Mul(transformation.lightInv.x, norm->x) +
fix16Mul(transformation.lightInv.y, norm->y) +
fix16Mul(transformation.lightInv.z, norm->z);
if (dp > 0) col += (dp >> (FIX16_FRAC_BITS - 2));
BMP_drawPolygon(v, 4, col | (col << 4));
}
}
