debugging the BSP

[dosdemo] / src / polyfill.c

diff --git a/src/polyfill.c b/src/polyfill.c
index 634d525..1393cd2 100644 (file)
--- a/src/polyfill.c
+++ b/src/polyfill.c
@@ -2,7 +2,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>
-#if defined(__WATCOMC__) || defined(_MSC_VER)
+#if defined(__WATCOMC__) || defined(_MSC_VER) || defined(__DJGPP__)
 #include <malloc.h>
 #else
 #include <alloca.h>
@@ -19,7 +19,7 @@ void (*fillfunc[])(struct pvertex*, int) = {
        polyfill_tex_gouraud
 };
 
-struct pimage pimg_fb, pimg_texture;
+struct pimage pfill_fb, pfill_tex;
 
 void polyfill(int mode, struct pvertex *verts, int nverts)
 {
@@ -46,13 +46,13 @@ void polyfill_wire(struct pvertex *verts, int nverts)
                ++v;
                x1 = v->x >> 8;
                y1 = v->y >> 8;
-               if(clip_line(&x0, &y0, &x1, &y1, 0, 0, pimg_fb.width, pimg_fb.height)) {
+               if(clip_line(&x0, &y0, &x1, &y1, 0, 0, pfill_fb.width, pfill_fb.height)) {
                        draw_line(x0, y0, x1, y1, color);
                }
        }
        x0 = verts[0].x >> 8;
        y0 = verts[0].y >> 8;
-       if(clip_line(&x1, &y1, &x0, &y0, 0, 0, pimg_fb.width, pimg_fb.height)) {
+       if(clip_line(&x1, &y1, &x0, &y0, 0, 0, pfill_fb.width, pfill_fb.height)) {
                draw_line(x1, y1, x0, y0, color);
        }
 }
@@ -60,6 +60,21 @@ void polyfill_wire(struct pvertex *verts, int nverts)
 #define NEXTIDX(x) (((x) - 1 + nverts) % nverts)
 #define PREVIDX(x) (((x) + 1) % nverts)
 
+/* XXX
+ * When HIGH_QUALITY is defined, the rasterizer calculates slopes for attribute
+ * interpolation on each scanline separately; otherwise the slope for each
+ * attribute would be calculated once for the whole polygon, which is faster,
+ * but produces some slight quantization artifacts, due to the limited precision
+ * of fixed-point calculations.
+ */
+#define HIGH_QUALITY
+
+/* extra bits of precision to use when interpolating colors.
+ * try tweaking this if you notice strange quantization artifacts.
+ */
+#define COLOR_SHIFT    12
+
+
 #define POLYFILL polyfill_flat
 #define SCANEDGE scanedge_flat
 #undef GOURAUD