X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=dosdemo;a=blobdiff_plain;f=src%2F3dgfx%2Fpolyfill.c;fp=src%2F3dgfx%2Fpolyfill.c;h=972c2187b8da93eefd832d87aa5da071f000754a;hp=0000000000000000000000000000000000000000;hb=57bd2dc519c47f434e3e5acf998fb9c72448cbce;hpb=d956a9d9273eebfacfda58cb3bafff017269d5dc diff --git a/src/3dgfx/polyfill.c b/src/3dgfx/polyfill.c new file mode 100644 index 0000000..972c218 --- /dev/null +++ b/src/3dgfx/polyfill.c @@ -0,0 +1,286 @@ +#include +#include +#include +#include +#if defined(__WATCOMC__) || defined(_WIN32) || defined(__DJGPP__) +#include +#else +#include +#endif +#include "polyfill.h" +#include "gfxutil.h" + +#define FILL_POLY_BITS 0x03 + +/* mode bits: 00-wire 01-flat 10-gouraud 11-reserved + * bit 2: texture + * bit 3-4: blend mode: 00-none 01-alpha 10-additive 11-reserved + */ +void (*fillfunc[])(struct pvertex*, int) = { + polyfill_wire, + polyfill_flat, + polyfill_gouraud, + 0, + polyfill_tex_wire, + polyfill_tex_flat, + polyfill_tex_gouraud, + 0, + polyfill_alpha_wire, + polyfill_alpha_flat, + polyfill_alpha_gouraud, + 0, + polyfill_alpha_tex_wire, + polyfill_alpha_tex_flat, + polyfill_alpha_tex_gouraud, + 0, + polyfill_add_wire, + polyfill_add_flat, + polyfill_add_gouraud, + 0, + polyfill_add_tex_wire, + polyfill_add_tex_flat, + polyfill_add_tex_gouraud, + 0, 0, 0, 0, 0, 0, 0, 0, 0 +}; + +struct pimage pfill_fb, pfill_tex; + +#define EDGEPAD 8 +static struct pvertex *edgebuf, *left, *right; +static int edgebuf_size; +static int fbheight; + +/* +#define CHECKEDGE(x) \ + do { \ + assert(x >= 0); \ + assert(x < fbheight); \ + } while(0) +*/ +#define CHECKEDGE(x) + + +void polyfill_fbheight(int height) +{ + void *tmp; + int newsz = (height * 2 + EDGEPAD * 3) * sizeof *edgebuf; + + if(newsz > edgebuf_size) { + free(edgebuf); + if(!(edgebuf = malloc(newsz))) { + fprintf(stderr, "failed to allocate edge table buffer (%d bytes)\n", newsz); + abort(); + } + edgebuf_size = newsz; + + left = edgebuf + EDGEPAD; + right = edgebuf + height + EDGEPAD * 2; + +#ifndef NDEBUG + memset(edgebuf, 0xaa, EDGEPAD * sizeof *edgebuf); + memset(edgebuf + height + EDGEPAD, 0xaa, EDGEPAD * sizeof *edgebuf); + memset(edgebuf + height * 2 + EDGEPAD * 2, 0xaa, EDGEPAD * sizeof *edgebuf); +#endif + } + + fbheight = height; +} + +void polyfill(int mode, struct pvertex *verts, int nverts) +{ +#ifndef NDEBUG + if(!fillfunc[mode]) { + fprintf(stderr, "polyfill mode %d not implemented\n", mode); + abort(); + } +#endif + + fillfunc[mode](verts, nverts); +} + +void polyfill_wire(struct pvertex *verts, int nverts) +{ + int i, x0, y0, x1, y1; + struct pvertex *v = verts; + unsigned short color = ((v->r << 8) & 0xf800) | + ((v->g << 3) & 0x7e0) | ((v->b >> 3) & 0x1f); + + for(i=0; ix >> 8; + y0 = v->y >> 8; + ++v; + x1 = v->x >> 8; + y1 = v->y >> 8; + 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, pfill_fb.width, pfill_fb.height)) { + draw_line(x1, y1, x0, y0, color); + } +} + +void polyfill_tex_wire(struct pvertex *verts, int nverts) +{ + polyfill_wire(verts, nverts); /* TODO */ +} + +void polyfill_alpha_wire(struct pvertex *verts, int nverts) +{ + polyfill_wire(verts, nverts); /* TODO */ +} + +void polyfill_alpha_tex_wire(struct pvertex *verts, int nverts) +{ + polyfill_wire(verts, nverts); /* TODO */ +} + +void polyfill_add_wire(struct pvertex *verts, int nverts) +{ + polyfill_wire(verts, nverts); /* TODO */ +} + +void polyfill_add_tex_wire(struct pvertex *verts, int nverts) +{ + polyfill_wire(verts, nverts); /* TODO */ +} + +#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 +#undef TEXMAP +#undef BLEND_ALPHA +#undef BLEND_ADD +#include "polytmpl.h" +#undef POLYFILL +#undef SCANEDGE + +#define POLYFILL polyfill_gouraud +#define SCANEDGE scanedge_gouraud +#define GOURAUD +#undef TEXMAP +#undef BLEND_ALPHA +#undef BLEND_ADD +#include "polytmpl.h" +#undef POLYFILL +#undef SCANEDGE + +#define POLYFILL polyfill_tex_flat +#define SCANEDGE scanedge_tex_flat +#undef GOURAUD +#define TEXMAP +#undef BLEND_ALPHA +#undef BLEND_ADD +#include "polytmpl.h" +#undef POLYFILL +#undef SCANEDGE + +#define POLYFILL polyfill_tex_gouraud +#define SCANEDGE scanedge_tex_gouraud +#define GOURAUD +#define TEXMAP +#undef BLEND_ALPHA +#undef BLEND_ADD +#include "polytmpl.h" +#undef POLYFILL +#undef SCANEDGE + +#define POLYFILL polyfill_alpha_flat +#define SCANEDGE scanedge_alpha_flat +#undef GOURAUD +#undef TEXMAP +#define BLEND_ALPHA +#undef BLEND_ADD +#include "polytmpl.h" +#undef POLYFILL +#undef SCANEDGE + +#define POLYFILL polyfill_alpha_gouraud +#define SCANEDGE scanedge_alpha_gouraud +#define GOURAUD +#undef TEXMAP +#define BLEND_ALPHA +#undef BLEND_ADD +#include "polytmpl.h" +#undef POLYFILL +#undef SCANEDGE + +#define POLYFILL polyfill_alpha_tex_flat +#define SCANEDGE scanedge_alpha_tex_flat +#undef GOURAUD +#define TEXMAP +#define BLEND_ALPHA +#undef BLEND_ADD +#include "polytmpl.h" +#undef POLYFILL +#undef SCANEDGE + +#define POLYFILL polyfill_alpha_tex_gouraud +#define SCANEDGE scanedge_alpha_tex_gouraud +#define GOURAUD +#define TEXMAP +#define BLEND_ALPHA +#undef BLEND_ADD +#include "polytmpl.h" +#undef POLYFILL +#undef SCANEDGE + +#define POLYFILL polyfill_add_flat +#define SCANEDGE scanedge_add_flat +#undef GOURAUD +#undef TEXMAP +#undef BLEND_ALPHA +#define BLEND_ADD +#include "polytmpl.h" +#undef POLYFILL +#undef SCANEDGE + +#define POLYFILL polyfill_add_gouraud +#define SCANEDGE scanedge_add_gouraud +#define GOURAUD +#undef TEXMAP +#undef BLEND_ALPHA +#define BLEND_ADD +#include "polytmpl.h" +#undef POLYFILL +#undef SCANEDGE + +#define POLYFILL polyfill_add_tex_flat +#define SCANEDGE scanedge_add_tex_flat +#undef GOURAUD +#define TEXMAP +#undef BLEND_ALPHA +#define BLEND_ADD +#include "polytmpl.h" +#undef POLYFILL +#undef SCANEDGE + +#define POLYFILL polyfill_add_tex_gouraud +#define SCANEDGE scanedge_add_tex_gouraud +#define GOURAUD +#define TEXMAP +#undef BLEND_ALPHA +#define BLEND_ADD +#include "polytmpl.h" +#undef POLYFILL +#undef SCANEDGE