more vbe

[dosdemo] / src / 3dgfx.c

diff --git a/src/3dgfx.c b/src/3dgfx.c
index c852736..6737094 100644 (file)
--- a/src/3dgfx.c
+++ b/src/3dgfx.c
@@ -37,7 +37,7 @@ struct material {
 struct g3d_state {
        unsigned int opt;
        int frontface;
-       int fill_mode;
+       int polymode;
 
        g3d_matrix mat[G3D_NUM_MATRICES][STACK_SIZE];
        int mtop[G3D_NUM_MATRICES];
@@ -50,7 +50,7 @@ struct g3d_state {
        struct material mtl;
 
        int width, height;
-       uint16_t *pixels;
+       g3d_pixel *pixels;
 
        int vport[4];
 
@@ -83,7 +83,7 @@ int g3d_init(void)
                return -1;
        }
        st->opt = G3D_CLIP_FRUSTUM;
-       st->fill_mode = POLYFILL_FLAT;
+       st->polymode = POLYFILL_FLAT;
 
        for(i=0; i<G3D_NUM_MATRICES; i++) {
                g3d_matrix_mode(i);
@@ -159,7 +159,7 @@ void g3d_front_face(unsigned int order)
 
 void g3d_polygon_mode(int pmode)
 {
-       st->fill_mode = pmode;
+       st->polymode = pmode;
 }
 
 void g3d_matrix_mode(int mmode)
@@ -411,7 +411,7 @@ void g3d_draw(int prim, const struct g3d_vertex *varr, int varr_size)
 void g3d_draw_indexed(int prim, const struct g3d_vertex *varr, int varr_size,
                const uint16_t *iarr, int iarr_size)
 {
-       int i, j, vnum, nfaces;
+       int i, j, vnum, nfaces, fill_mode;
        struct pvertex pv[16];
        struct g3d_vertex v[16];
        int mvtop = st->mtop[G3D_MODELVIEW];
@@ -442,6 +442,14 @@ void g3d_draw_indexed(int prim, const struct g3d_vertex *varr, int varr_size,
                                v[i].u = v[i].nx * 0.5 + 0.5;
                                v[i].v = v[i].ny * 0.5 + 0.5;
                        }
+                       if(st->opt & G3D_TEXTURE_MAT) {
+                               float *mat = st->mat[G3D_TEXTURE][st->mtop[G3D_TEXTURE]];
+                               float x = mat[0] * v[i].u + mat[4] * v[i].v + mat[12];
+                               float y = mat[1] * v[i].u + mat[5] * v[i].v + mat[13];
+                               float w = mat[3] * v[i].u + mat[7] * v[i].v + mat[15];
+                               v[i].u = x / w;
+                               v[i].v = y / w;
+                       }
                        xform4_vec3(st->mat[G3D_PROJECTION][ptop], &v[i].x);
                }
 
@@ -503,26 +511,33 @@ void g3d_draw_indexed(int prim, const struct g3d_vertex *varr, int varr_size,
                        if(st->opt & G3D_BLEND) {
                                int r, g, b;
                                int inv_alpha = 255 - pv[0].a;
-                               uint16_t *dest = st->pixels + (pv[0].y >> 8) * st->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);
+                               g3d_pixel *dest = st->pixels + (pv[0].y >> 8) * st->width + (pv[0].x >> 8);
+                               r = ((int)pv[0].r * pv[0].a + G3D_UNPACK_R(*dest) * inv_alpha) >> 8;
+                               g = ((int)pv[0].g * pv[0].a + G3D_UNPACK_G(*dest) * inv_alpha) >> 8;
+                               b = ((int)pv[0].b * pv[0].a + G3D_UNPACK_B(*dest) * inv_alpha) >> 8;
+                               *dest++ = G3D_PACK_RGB(r, g, b);
                        } else {
-                               uint16_t *dest = st->pixels + (pv[0].y >> 8) * st->width + (pv[0].x >> 8);
-                               *dest = PACK_RGB16(pv[0].r, pv[0].g, pv[0].b);
+                               g3d_pixel *dest = st->pixels + (pv[0].y >> 8) * st->width + (pv[0].x >> 8);
+                               *dest = G3D_PACK_RGB(pv[0].r, pv[0].g, pv[0].b);
                        }
                        break;
 
                case 2:
                        {
-                               uint16_t col = PACK_RGB16(pv[0].r, pv[0].g, pv[0].b);
+                               g3d_pixel col = G3D_PACK_RGB(pv[0].r, pv[0].g, pv[0].b);
                                draw_line(pv[0].x >> 8, pv[0].y >> 8, pv[1].x >> 8, pv[1].y >> 8, col);
                        }
                        break;
 
                default:
-                       polyfill(st->fill_mode, pv, vnum);
+                       fill_mode = st->polymode;
+                       if(st->opt & G3D_TEXTURE_2D) {
+                               fill_mode |= POLYFILL_TEX_BIT;
+                       }
+                       if(st->opt & G3D_BLEND) {
+                               fill_mode |= POLYFILL_BLEND_BIT;
+                       }
+                       polyfill(fill_mode, pv, vnum);
                }
        }
 }
@@ -570,20 +585,23 @@ void g3d_normal(float x, float y, float z)
        st->imm_curv.nz = z;
 }
 
+#define CLAMP(x, a, b) ((x) < (a) ? (a) : ((x) > (b) ? (b) : (x)))
+#define MIN(a, b)              ((a) < (b) ? (a) : (b))
+
 void g3d_color3b(unsigned char r, unsigned char g, unsigned char b)
 {
-       st->imm_curv.r = r;
-       st->imm_curv.g = g;
-       st->imm_curv.b = b;
+       st->imm_curv.r = MIN(r, 255);
+       st->imm_curv.g = MIN(g, 255);
+       st->imm_curv.b = MIN(b, 255);
        st->imm_curv.a = 255;
 }
 
 void g3d_color4b(unsigned char r, unsigned char g, unsigned char b, unsigned char a)
 {
-       st->imm_curv.r = r;
-       st->imm_curv.g = g;
-       st->imm_curv.b = b;
-       st->imm_curv.a = a;
+       st->imm_curv.r = MIN(r, 255);
+       st->imm_curv.g = MIN(g, 255);
+       st->imm_curv.b = MIN(b, 255);
+       st->imm_curv.a = MIN(a, 255);
 }
 
 void g3d_color3f(float r, float g, float b)
@@ -591,9 +609,9 @@ void g3d_color3f(float r, float g, float b)
        int ir = r * 255.0f;
        int ig = g * 255.0f;
        int ib = b * 255.0f;
-       st->imm_curv.r = ir > 255 ? 255 : ir;
-       st->imm_curv.g = ig > 255 ? 255 : ig;
-       st->imm_curv.b = ib > 255 ? 255 : ib;
+       st->imm_curv.r = CLAMP(ir, 0, 255);
+       st->imm_curv.g = CLAMP(ig, 0, 255);
+       st->imm_curv.b = CLAMP(ib, 0, 255);
        st->imm_curv.a = 255;
 }
 
@@ -603,10 +621,10 @@ void g3d_color4f(float r, float g, float b, float a)
        int ig = g * 255.0f;
        int ib = b * 255.0f;
        int ia = a * 255.0f;
-       st->imm_curv.r = ir > 255 ? 255 : ir;
-       st->imm_curv.g = ig > 255 ? 255 : ig;
-       st->imm_curv.b = ib > 255 ? 255 : ib;
-       st->imm_curv.a = ia > 255 ? 255 : ia;
+       st->imm_curv.r = CLAMP(ir, 0, 255);
+       st->imm_curv.g = CLAMP(ig, 0, 255);
+       st->imm_curv.b = CLAMP(ib, 0, 255);
+       st->imm_curv.a = CLAMP(ia, 0, 255);
 }
 
 void g3d_texcoord(float u, float v)