3dgfx code, untested

[metatoy] / src / 3dgfx / polyfill.h

diff --git a/src/3dgfx/polyfill.h b/src/3dgfx/polyfill.h
new file mode 100644 (file)
index 0000000..aa7bf60
--- /dev/null
+++ b/src/3dgfx/polyfill.h
@@ -0,0 +1,71 @@
+#ifndef POLYFILL_H_
+#define POLYFILL_H_
+
+#include "inttypes.h"
+#include "3dgfx.h"
+
+#define POLYFILL_MODE_MASK     0x03
+#define POLYFILL_TEX_BIT       0x04
+#define POLYFILL_ZBUF_BIT      0x08
+
+enum {
+       POLYFILL_WIRE                   = 0,
+       POLYFILL_FLAT,
+       POLYFILL_GOURAUD,
+
+       POLYFILL_TEX_WIRE               = 4,
+       POLYFILL_TEX_FLAT,
+       POLYFILL_TEX_GOURAUD,
+
+       POLYFILL_WIRE_ZBUF                      = 16,
+       POLYFILL_FLAT_ZBUF,
+       POLYFILL_GOURAUD_ZBUF,
+
+       POLYFILL_TEX_WIRE_ZBUF          = 20,
+       POLYFILL_TEX_FLAT_ZBUF,
+       POLYFILL_TEX_GOURAUD_ZBUF
+};
+
+/* projected vertices for the rasterizer */
+struct pvertex {
+       int32_t x, y; /* 24.8 fixed point */
+       int32_t u, v; /* 16.16 fixed point */
+       int32_t l, a;  /* int 0-255 */
+       int32_t z;      /* 0-(2^24-1) */
+};
+
+struct pgradient {
+       int32_t dudx, dudy, dvdx, dvdy;
+       int32_t dldx, dldy, dadx, dady;
+       int32_t dzdx, dzdy;
+};
+
+struct pimage {
+       g3d_pixel *pixels;
+       int width, height;
+
+       int xshift, yshift;
+       unsigned int xmask, ymask;
+};
+
+extern struct pimage pfill_fb;
+extern struct pimage pfill_tex;
+extern uint32_t *pfill_zbuf;
+extern struct pgradient pgrad;
+
+void polyfill_fbheight(int height);
+
+void polyfill(int mode, struct pvertex *verts);
+
+void polyfill_wire(struct pvertex *verts);
+void polyfill_flat(struct pvertex *verts);
+void polyfill_gouraud(struct pvertex *verts);
+void polyfill_tex_wire(struct pvertex *verts);
+void polyfill_tex_flat(struct pvertex *verts);
+void polyfill_tex_gouraud(struct pvertex *verts);
+void polyfill_flat_zbuf(struct pvertex *verts);
+void polyfill_gouraud_zbuf(struct pvertex *verts);
+void polyfill_tex_flat_zbuf(struct pvertex *verts);
+void polyfill_tex_gouraud_zbuf(struct pvertex *verts);
+
+#endif /* POLYFILL_H_ */