X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=src%2F3dgfx.c;h=673122d07fc29f66f2b7e76956736fe2cf2b72b9;hb=8cee0ffb00cce3d81487f1161286ac299db7d044;hp=c32e6c2fe4c5436e7275540aa9e4cd9e4129417f;hpb=a563d2f0efaa980af0f0b39cdf1c9115fed99d00;p=dosdemo

diff --git a/src/3dgfx.c b/src/3dgfx.c
index c32e6c2..673122d 100644
--- a/src/3dgfx.c
+++ b/src/3dgfx.c
@@ -14,9 +14,10 @@
 #define STACK_SIZE	8
 typedef float g3d_matrix[16];
 
-#define MAX_VBUF_SIZE	256
 #define MAX_LIGHTS		4
 
+#define IMM_VBUF_SIZE	256
+
 struct light {
 	float x, y, z;
 	float r, g, b;
@@ -47,8 +48,15 @@ struct g3d_state {
 	uint16_t *pixels;
 
 	int vport[4];
+
+	/* immediate mode */
+	int imm_prim;
+	int imm_numv, imm_pcount;
+	struct g3d_vertex imm_curv;
+	struct g3d_vertex imm_vbuf[IMM_VBUF_SIZE];
 };
 
+static void imm_flush(void);
 static void xform4_vec3(const float *mat, float *vec);
 static void xform3_vec3(const float *mat, float *vec);
 static void shade(struct g3d_vertex *v);
@@ -462,7 +470,7 @@ void g3d_draw_indexed(int prim, const struct g3d_vertex *varr, int varr_size,
 			int32_t ay = pv[1].y - pv[0].y;
 			int32_t bx = pv[2].x - pv[0].x;
 			int32_t by = pv[2].y - pv[0].y;
-			int32_t cross_z = ax * (by >> 8) - ay * (bx >> 8);
+			int32_t cross_z = (ax >> 4) * (by >> 4) - (ay >> 4) * (bx >> 4);
 			int sign = (cross_z >> 31) & 1;
 
 			if(!(sign ^ st->frontface)) {
@@ -496,6 +504,94 @@ void g3d_draw_indexed(int prim, const struct g3d_vertex *varr, int varr_size,
 	}
 }
 
+void g3d_begin(int prim)
+{
+	st->imm_prim = prim;
+	st->imm_pcount = prim;
+	st->imm_numv = 0;
+}
+
+void g3d_end(void)
+{
+	imm_flush();
+}
+
+static void imm_flush(void)
+{
+	int numv = st->imm_numv;
+	st->imm_numv = 0;
+	g3d_draw_indexed(st->imm_prim, st->imm_vbuf, numv, 0, 0);
+}
+
+void g3d_vertex(float x, float y, float z)
+{
+	struct g3d_vertex *vptr = st->imm_vbuf + st->imm_numv++;
+	*vptr = st->imm_curv;
+	vptr->x = x;
+	vptr->y = y;
+	vptr->z = z;
+	vptr->w = 1.0f;
+
+	if(!--st->imm_pcount) {
+		if(st->imm_numv >= IMM_VBUF_SIZE - st->imm_prim) {
+			imm_flush();
+		}
+		st->imm_pcount = st->imm_prim;
+	}
+}
+
+void g3d_normal(float x, float y, float z)
+{
+	st->imm_curv.nx = x;
+	st->imm_curv.ny = y;
+	st->imm_curv.nz = z;
+}
+
+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.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;
+}
+
+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.a = 255;
+}
+
+void g3d_color4f(float r, float g, float b, float a)
+{
+	int ir = r * 255.0f;
+	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;
+}
+
+void g3d_texcoord(float u, float v)
+{
+	st->imm_curv.u = u;
+	st->imm_curv.v = v;
+}
+
 static void xform4_vec3(const float *mat, float *vec)
 {
 	float x = mat[0] * vec[0] + mat[4] * vec[1] + mat[8] * vec[2] + mat[12];