added texture mapping

[dosdemo] / src / 3dgfx.c

diff --git a/src/3dgfx.c b/src/3dgfx.c
index d7e2e41..47b3830 100644 (file)
--- a/src/3dgfx.c
+++ b/src/3dgfx.c
@@ -91,9 +91,9 @@ void g3d_framebuffer(int width, int height, void *pixels)
        st->height = height;
        st->pixels = pixels;
 
-       pimg_fb.pixels = pixels;
-       pimg_fb.width = width;
-       pimg_fb.height = height;
+       pfill_fb.pixels = pixels;
+       pfill_fb.width = width;
+       pfill_fb.height = height;
 }
 
 void g3d_enable(unsigned int opt)
@@ -340,6 +340,33 @@ void g3d_mtl_shininess(float shin)
        st->mtl.shin = shin;
 }
 
+static INLINE int calc_shift(unsigned int x)
+{
+       int res = -1;
+       while(x) {
+               x >>= 1;
+               ++res;
+       }
+       return res;
+}
+
+static INLINE int calc_mask(unsigned int x)
+{
+       return x - 1;
+}
+
+void g3d_set_texture(int xsz, int ysz, void *pixels)
+{
+       pfill_tex.pixels = pixels;
+       pfill_tex.width = xsz;
+       pfill_tex.height = ysz;
+
+       pfill_tex.xshift = calc_shift(xsz);
+       pfill_tex.yshift = calc_shift(ysz);
+       pfill_tex.xmask = calc_mask(xsz);
+       pfill_tex.ymask = calc_mask(ysz);
+}
+
 void g3d_draw(int prim, const struct g3d_vertex *varr, int varr_size)
 {
        g3d_draw_indexed(prim, varr, varr_size, 0, 0);