fixed point drawing in 3dgfx and added new greets screen

[dosdemo] / src / 3dgfx.c

diff --git a/src/3dgfx.c b/src/3dgfx.c
index a90da7a..0b3505b 100644 (file)
--- a/src/3dgfx.c
+++ b/src/3dgfx.c
@@ -4,9 +4,11 @@
 #include <math.h>
 #include <assert.h>
 #include "3dgfx.h"
+#include "gfxutil.h"
 #include "polyfill.h"
 #include "polyclip.h"
 #include "inttypes.h"
+#include "demo.h"
 #include "util.h"
 
 #define STACK_SIZE     8
@@ -451,6 +453,7 @@ void g3d_draw_indexed(int prim, const struct g3d_vertex *varr, int varr_size,
                        pv[i].r = v[i].r;
                        pv[i].g = v[i].g;
                        pv[i].b = v[i].b;
+                       pv[i].a = v[i].a;
                }
 
                /* backface culling */
@@ -467,7 +470,29 @@ void g3d_draw_indexed(int prim, const struct g3d_vertex *varr, int varr_size,
                        }
                }
 
-               polyfill(st->fill_mode, pv, vnum);
+               switch(vnum) {
+               case 1:
+                       if(st->opt & G3D_BLEND) {
+                               int r, g, b;
+                               int inv_alpha = 255 - pv[0].a;
+                               uint16_t *dest = fb_pixels + (pv[0].y >> 8) * fb_width + (pv[0].x >> 8);
+                               r = ((int)pv[0].r * pv[0].a + UNPACK_R16(*dest) * inv_alpha) >> 8;
+                               g = ((int)pv[0].g * pv[0].a + UNPACK_G16(*dest) * inv_alpha) >> 8;
+                               b = ((int)pv[0].b * pv[0].a + UNPACK_B16(*dest) * inv_alpha) >> 8;
+                               *dest++ = PACK_RGB16(r, g, b);
+                       } else {
+                               uint16_t *dest = fb_pixels + (pv[0].y >> 8) * fb_width + (pv[0].x >> 8);
+                               *dest = PACK_RGB16(pv[0].r, pv[0].g, pv[0].b);
+                       }
+                       break;
+
+               case 2:
+                       /* TODO: draw line */
+                       break;
+
+               default:
+                       polyfill(st->fill_mode, pv, vnum);
+               }
        }
 }