dos port underway

[retroray] / src / gaw / gawswtnl.c

diff --git a/src/gaw/gawswtnl.c b/src/gaw/gawswtnl.c
index 2df3ed3..c307f8a 100644 (file)
--- a/src/gaw/gawswtnl.c
+++ b/src/gaw/gawswtnl.c
@@ -1,5 +1,5 @@
 /*
-Deep Runner - 6dof shooter game for the SGI O2.
+RetroRay - integrated standalone vintage modeller/renderer
 Copyright (C) 2023  John Tsiombikas <nuclear@mutantstargoat.com>
 
 This program is free software: you can redistribute it and/or modify
@@ -100,6 +100,11 @@ void gaw_viewport(int x, int y, int w, int h)
        st.vport[3] = h;
 }
 
+void gaw_get_viewport(int *vp)
+{
+       memcpy(vp, st.vport, sizeof st.vport);
+}
+
 void gaw_matrix_mode(int mode)
 {
        st.mmode = mode;
@@ -182,7 +187,7 @@ void gaw_rotate(float deg, float x, float y, float z)
 {
        static float m[16];
 
-       float angle = M_PI * deg / 180.0f;
+       float angle = CGM_PI * deg / 180.0f;
        float sina = sin(angle);
        float cosa = cos(angle);
        float one_minus_cosa = 1.0f - cosa;
@@ -261,7 +266,7 @@ void gaw_perspective(float vfov_deg, float aspect, float znear, float zfar)
 {
        static float m[16];
 
-       float vfov = M_PI * vfov_deg / 180.0f;
+       float vfov = CGM_PI * vfov_deg / 180.0f;
        float s = 1.0f / tan(vfov * 0.5f);
        float range = znear - zfar;
 
@@ -316,6 +321,11 @@ void gaw_alpha_func(int func, float ref)
        /* TODO */
 }
 
+void gaw_zoffset(float offs)
+{
+       st.zoffs = offs * 0.1;
+}
+
 #define CLAMP(x, a, b)         ((x) < (a) ? (a) : ((x) > (b) ? (b) : (x)))
 
 void gaw_clear_color(float r, float g, float b, float a)
@@ -532,12 +542,14 @@ void gaw_draw_indexed(int prim, const unsigned int *idxarr, int nidx)
                if(!vnum) continue;
 
                for(i=0; i<vnum; i++) {
-                       if(v[i].w != 0.0f) {
-                               v[i].x /= v[i].w;
-                               v[i].y /= v[i].w;
-                               if(st.opt & (1 << GAW_DEPTH_TEST)) {
-                                       v[i].z /= v[i].w;
-                               }
+                       float oow = 1.0f / v[i].w;
+                       v[i].x *= oow;
+                       v[i].y *= oow;
+                       if(st.opt & (1 << GAW_POLYGON_OFFSET)) {
+                               v[i].z += st.zoffs;
+                       }
+                       if(st.opt & (1 << GAW_DEPTH_TEST)) {
+                               v[i].z *= oow;
                        }
                }
 
@@ -548,7 +560,7 @@ void gaw_draw_indexed(int prim, const unsigned int *idxarr, int nidx)
 void gaw_begin(int prim)
 {
        st.imm_prim = prim;
-       st.imm_pcount = prim;
+       st.imm_pcount = prim_vcount[st.imm_prim];
        st.imm_numv = 0;
 }
 
@@ -617,18 +629,23 @@ void gaw_texcoord2f(float u, float v)
 
 void gaw_vertex2f(float x, float y)
 {
-       gaw_vertex3f(x, y, 0);
+       gaw_vertex4f(x, y, 0, 1);
 }
 
 void gaw_vertex3f(float x, float y, float z)
 {
+       gaw_vertex4f(x, y, z, 1);
+}
+
+void gaw_vertex4f(float x, float y, float z, float w)
+{
        float *cptr = st.imm_cbuf + st.imm_numv * 4;
        struct 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;
+       vptr->w = w;
 
        cptr[0] = st.imm_curcol[0];
        cptr[1] = st.imm_curcol[1];