// -------------------------------------------------------------------------------------
// Interface from Matt's data structures to Mike's texture mapper.
// -------------------------------------------------------------------------------------
void draw_tmap(grs_bitmap *bp,int nverts,g3s_point **vertbuf)
{
int i;
// These variables are used in system which renders texture maps which lie on one scanline as a line.
// fix div_numerator;
int lighting_on_save = Lighting_on;
Assert(nverts <= MAX_TMAP_VERTS);
#ifdef USE_MULT_CODE
if ( !divide_table_filled ) fill_divide_table();
#endif
// -- now called from g3_start_frame -- init_interface_vars_to_assembler();
// If no transparency and seg depth is large, render as flat shaded.
if ((Current_seg_depth > Max_linear_depth) && ((bp->bm_flags & 3) == 0)) {
draw_tmap_flat(bp, nverts, vertbuf);
return;
}
if ( bp->bm_flags & BM_FLAG_RLE )
bp = rle_expand_texture( bp ); // Expand if rle'd
Transparency_on = bp->bm_flags & BM_FLAG_TRANSPARENT;
if (bp->bm_flags & BM_FLAG_NO_LIGHTING)
Lighting_on = 0;
// Setup texture map in Tmap1
Tmap1.nv = nverts; // Initialize number of vertices
// div_numerator = DivNum; //f1_0*3;
for (i=0; i<nverts; i++) {
g3ds_vertex *tvp = &Tmap1.verts[i];
g3s_point *vp = vertbuf[i];
tvp->x2d = vp->p3_sx;
tvp->y2d = vp->p3_sy;
// Check for overflow on fixdiv. Will overflow on vp->z <= something small. Allow only as low as 256.
if (vp->p3_z < 256) {
vp->p3_z = 256;
// Int3(); // we would overflow if we divided!
}
tvp->z = fixdiv(F1_0*12, vp->p3_z);
tvp->u = vp->p3_u << 6; //* bp->bm_w;
tvp->v = vp->p3_v << 6; //* bp->bm_h;
Assert(Lighting_on < 3);
if (Lighting_on)
tvp->l = vp->p3_l * NUM_LIGHTING_LEVELS;
}
Lighting_enabled = Lighting_on;
// Now, call my texture mapper.
if (Lighting_on) {
switch (Interpolation_method) { // 0 = choose, 1 = linear, 2 = /8 perspective, 3 = full perspective
case 0: // choose best interpolation
per2_flag = 1;
if (Current_seg_depth > Max_perspective_depth)
ntexture_map_lighted_linear(bp, &Tmap1);
else
ntexture_map_lighted(bp, &Tmap1);
break;
case 1: // linear interpolation
per2_flag = 1;
ntexture_map_lighted_linear(bp, &Tmap1);
break;
case 2: // perspective every 8th pixel interpolation
per2_flag = 1;
ntexture_map_lighted(bp, &Tmap1);
break;
case 3: // perspective every pixel interpolation
per2_flag = 0; // this hack means do divide every pixel
ntexture_map_lighted(bp, &Tmap1);
break;
default:
Assert(0); // Illegal value for Interpolation_method, must be 0,1,2,3
}
} else {
switch (Interpolation_method) { // 0 = choose, 1 = linear, 2 = /8 perspective, 3 = full perspective
case 0: // choose best interpolation
per2_flag = 1;
if (Current_seg_depth > Max_perspective_depth)
ntexture_map_lighted_linear(bp, &Tmap1);
else
ntexture_map_lighted(bp, &Tmap1);
break;
case 1: // linear interpolation
per2_flag = 1;
ntexture_map_lighted_linear(bp, &Tmap1);
break;
case 2: // perspective every 8th pixel interpolation
per2_flag = 1;
ntexture_map_lighted(bp, &Tmap1);
break;
case 3: // perspective every pixel interpolation
per2_flag = 0; // this hack means do divide every pixel
ntexture_map_lighted(bp, &Tmap1);
break;
default:
Assert(0); // Illegal value for Interpolation_method, must be 0,1,2,3
}
}
Lighting_on = lighting_on_save;
}
// -------------------------------------------------------------------------------------
// Interface from Matt's data structures to Mike's texture mapper.
// -------------------------------------------------------------------------------------
void draw_tmap(grs_bitmap *bp,int nverts,g3s_point **vertbuf)
{
int i;
// These variables are used in system which renders texture maps which lie on one scanline as a line.
#if SC2000K
int flat_flag; // Set to 1 and remains 1 so long as all y coords are the same (in integer portion).
int last_y; // Y coordinate of previous vertex.
fix min_x = 0xfff0000, max_x = 0; // Minimum and maximum bounds of line to render in place of flat texture map.
#endif
// fix div_numerator;
int lighting_on_save = Lighting_on;
Assert(nverts <= MAX_TMAP_VERTS);
#ifdef USE_MULT_CODE
if ( !divide_table_filled ) fill_divide_table();
#endif
// -- now called from g3_start_frame -- init_interface_vars_to_assembler();
// If no transparency and seg depth is large, render as flat shaded.
if ((Current_seg_depth > Max_linear_depth) && ((bp->bm_flags & 3) == 0)) {
draw_tmap_flat(bp, nverts, vertbuf);
return;
}
if ( bp->bm_flags & BM_FLAG_RLE )
bp = rle_expand_texture( bp ); // Expand if rle'd
Transparency_on = bp->bm_flags & BM_FLAG_TRANSPARENT;
if (bp->bm_flags & BM_FLAG_NO_LIGHTING)
Lighting_on = 0;
// Set selector for current texture map.
if ( bp->bm_selector == 0 ) {
if (gr_bitmap_assign_selector( bp ) )
Error( "Couldn't assign selector in ntmap.c!\n" );
}
pixel_data_selector = bp->bm_selector;
// Setup texture map in Tmap1
Tmap1.nv = nverts; // Initialize number of vertices
#if SC2000K
last_y = f2i(vertbuf[0]->p3_sy);
flat_flag = 1; // Says so far, this texture map exists all on one scan line
#endif
// div_numerator = DivNum; //f1_0*3;
for (i=0; i<nverts; i++) {
g3ds_vertex *tvp = &Tmap1.verts[i];
g3s_point *vp = vertbuf[i];
tvp->x2d = vp->p3_sx;
tvp->y2d = vp->p3_sy;
#if SC2000K
// If y coordinates are not the same (in integer portion), then this texture map is not all on one scan line
if (f2i(tvp->y2d) != last_y)
flat_flag = 0;
// If everything is flat so far, set minimum x and y for rendering a scanline
if (flat_flag) {
if (tvp->x2d < min_x)
min_x = tvp->x2d;
if (tvp->x2d > max_x)
max_x = tvp->x2d;
}
#endif
// Check for overflow on fixdiv. Will overflow on vp->z <= something small. Allow only as low as 256.
if (vp->z < 256) {
vp->z = 256;
// Int3(); // we would overflow if we divided!
}
tvp->z = fixdiv(F1_0*12, vp->z);
tvp->u = vp->p3_u << 6; //* bp->bm_w;
tvp->v = vp->p3_v << 6; //* bp->bm_h;
Assert(Lighting_on < 3);
if (Lighting_on)
tvp->l = vp->p3_l * NUM_LIGHTING_LEVELS;
}
#if SC2000K
// Render a horizontal line instead of a texture map if flat_flag still set (all vertices on one scanline).
if (SC2000 && flat_flag) {
fix y,cvw;
Int3();
y = Tmap1.verts[0].y2d;
cvw = i2f(grd_curcanv->cv_bitmap.bm_w-1);
if (y<0 || y>i2f(grd_curcanv->cv_bitmap.bm_h-1)) { Lighting_on = lighting_on_save; return; }
//if (min_x < 0) min_x = 0;
//if (max_x > cvw) max_x = cvw;
gr_setcolor(*(bp->bm_data+32*32+32)); // Read center pixel of 64x64 bitmap, use as line color.
gr_line(min_x, Tmap1.verts[0].y2d, max_x, Tmap1.verts[0].y2d);
Lighting_on = lighting_on_save;
return;
}
#endif
Lighting_enabled = Lighting_on;
// Now, call my texture mapper.
if (Lighting_on) {
switch (Interpolation_method) { // 0 = choose, 1 = linear, 2 = /8 perspective, 3 = full perspective
case 0: // choose best interpolation
per2_flag = 1;
if (Current_seg_depth > Max_perspective_depth)
ntexture_map_lighted_linear(bp, &Tmap1);
else
ntexture_map_lighted(bp, &Tmap1);
break;
case 1: // linear interpolation
per2_flag = 1;
ntexture_map_lighted_linear(bp, &Tmap1);
break;
case 2: // perspective every 8th pixel interpolation
per2_flag = 1;
ntexture_map_lighted(bp, &Tmap1);
break;
case 3: // perspective every pixel interpolation
per2_flag = 0; // this hack means do divide every pixel
ntexture_map_lighted(bp, &Tmap1);
break;
default:
Assert(0); // Illegal value for Interpolation_method, must be 0,1,2,3
}
} else {
switch (Interpolation_method) { // 0 = choose, 1 = linear, 2 = /8 perspective, 3 = full perspective
case 0: // choose best interpolation
per2_flag = 1;
if (Current_seg_depth > Max_perspective_depth)
ntexture_map_lighted_linear(bp, &Tmap1);
else
ntexture_map_lighted(bp, &Tmap1);
break;
case 1: // linear interpolation
per2_flag = 1;
ntexture_map_lighted_linear(bp, &Tmap1);
break;
case 2: // perspective every 8th pixel interpolation
per2_flag = 1;
ntexture_map_lighted(bp, &Tmap1);
break;
case 3: // perspective every pixel interpolation
per2_flag = 0; // this hack means do divide every pixel
ntexture_map_lighted(bp, &Tmap1);
break;
default:
Assert(0); // Illegal value for Interpolation_method, must be 0,1,2,3
}
}
Lighting_on = lighting_on_save;
}