backdrop

[dosrtxon] / src / parts / rtxonoff.c

diff --git a/src/parts/rtxonoff.c b/src/parts/rtxonoff.c
index bab4d98..e56baeb 100644 (file)
--- a/src/parts/rtxonoff.c
+++ b/src/parts/rtxonoff.c
@@ -1,14 +1,18 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <math.h>
+#include <assert.h>
 #include "demo.h"
 #include "3dgfx.h"
 #include "screen.h"
 #include "cfgopt.h"
 #include "polyfill.h"
 #include "imago2.h"
+#include "util.h"
 #include "gfxutil.h"
 #include "mesh.h"
+#include "noise.h"
 
 static int init(void);
 static void destroy(void);
@@ -33,6 +37,16 @@ static const char *cartex_fname[2] = {"data/ldiablo.png", 0};
 static struct g3d_mesh mesh_car[2];
 static struct pimage tex_car[2];
 
+#define BGCOL_SIZE     128
+#define BGOFFS_SIZE    1024
+static uint16_t bgcol[BGCOL_SIZE];
+static uint16_t bgcol_mir[BGCOL_SIZE];
+static int bgoffs[BGOFFS_SIZE];
+static const int colzen[] = {98, 64, 192};
+static const int colhor[] = {128, 80, 64};
+static const int colmnt[] = {16, 9, 24};
+static uint16_t mountcol, mountcol_mir;
+
 static int shading = G3D_TEX_GOURAUD;
 static int do_clip = 1;
 
@@ -45,6 +59,25 @@ struct screen *rtxonoff_screen(void)
 static int init(void)
 {
        int i;
+       int col[3];
+
+       mountcol = PACK_RGB16(colmnt[0], colmnt[1], colmnt[2]);
+       mountcol_mir = PACK_RGB16(colmnt[0] / 2, colmnt[1] / 2, colmnt[2] / 2);
+
+       for(i=0; i<BGCOL_SIZE; i++) {
+               int32_t t = (i << 8) / BGCOL_SIZE;
+               col[0] = colhor[0] + ((colzen[0] - colhor[0]) * t >> 8);
+               col[1] = colhor[1] + ((colzen[1] - colhor[1]) * t >> 8);
+               col[2] = colhor[2] + ((colzen[2] - colhor[2]) * t >> 8);
+               bgcol[i] = PACK_RGB16(col[0], col[1], col[2]);
+               bgcol_mir[i] = PACK_RGB16(col[0] / 2, col[1] / 2, col[2] / 2);
+       }
+
+       for(i=0; i<BGOFFS_SIZE; i++) {
+               float x = 8.0f * (float)i / (float)BGOFFS_SIZE;
+
+               bgoffs[i] = pfbm1(x, 8.0f, 5) * 32 + 16;
+       }
 
        for(i=0; i<sizeof car_fname / sizeof car_fname[0]; i++) {
                if(cartex_fname[i]) {
@@ -75,33 +108,88 @@ static void destroy(void)
        }
 }
 
+#define VFOV   60
 static void start(long trans_time)
 {
        g3d_matrix_mode(G3D_PROJECTION);
        g3d_load_identity();
-       g3d_perspective(60.0, 1.3333333, 0.5, 100.0);
+       g3d_perspective(VFOV, 1.3333333, 0.5, 100.0);
 
        g3d_enable(G3D_CULL_FACE);
        g3d_enable(G3D_LIGHTING);
        g3d_enable(G3D_LIGHT0);
-
-       g3d_polygon_mode(shading);
 }
 
 static void update(void)
 {
        mouse_orbit_update(&cam_theta, &cam_phi, &cam_dist);
+
+       cam_theta = fmod(cam_theta, 360.0f);
+       if(cam_theta < 0) cam_theta += 360.0f;
+
+       if(cam_phi < 0) cam_phi = 0;
+}
+
+static void backdrop(void)
+{
+       static const int colzen[] = {98, 64, 192};
+       static const int colhor[] = {128, 80, 64};
+       int i, j, hory, start[3], end[3], col[3];
+       uint16_t *fbptr, pcol;
+       int cidx, offs = -10;
+       int startidx;
+
+       startidx = cround64(cam_theta * (float)BGOFFS_SIZE) / 360;
+
+       hory = (fb_height - 2 * fb_height * cround64(cam_phi) / VFOV) / 2;
+       if(hory > fb_height) hory = fb_height;
+
+       if(hory > 0) {
+               fbptr = fb_pixels + (hory - 1) * fb_width;
+               cidx = offs;
+               i = 0;
+               while(fbptr >= fb_pixels) {
+                       pcol = bgcol[cidx < 0 ? 0 : (cidx >= BGCOL_SIZE ? BGCOL_SIZE - 1 : cidx)];
+                       for(j=0; j<fb_width; j++) {
+                               if(cidx < bgoffs[(startidx + j) & (BGOFFS_SIZE - 1)]) {
+                                       fbptr[j] = mountcol;
+                               } else {
+                                       fbptr[j] = pcol;
+                               }
+                       }
+                       fbptr -= fb_width;
+                       cidx++;
+               }
+               cidx = offs;
+       } else {
+               cidx = offs - hory;
+               hory = 0;
+       }
+
+       fbptr = fb_pixels + hory * fb_width;
+       for(i=hory; i<fb_height; i++) {
+               pcol = bgcol_mir[cidx < 0 ? 0 : (cidx >= BGCOL_SIZE ? BGCOL_SIZE - 1 : cidx)];
+               for(j=0; j<fb_width; j++) {
+                       if(cidx < bgoffs[(startidx + j) & (BGOFFS_SIZE - 1)]) {
+                               *fbptr++ = mountcol_mir;
+                       } else {
+                               *fbptr++ = pcol;
+                       }
+               }
+               cidx++;
+       }
 }
 
 static void draw(void)
 {
-       int i;
+       int i, j;
+       uint16_t *fbptr = fb_pixels;
        static float vdir[3];
        float t = (float)time_msec / 16.0f;
 
        update();
 
-       memset(fb_pixels, 0, fb_width * fb_height * 2);
+       backdrop();
 
        g3d_matrix_mode(G3D_MODELVIEW);
        g3d_load_identity();
@@ -109,6 +197,7 @@ static void draw(void)
        g3d_rotate(cam_phi, 1, 0, 0);
        g3d_rotate(cam_theta, 0, 1, 0);
 
+       g3d_polygon_mode(shading);
        g3d_set_texture(tex_car[0].width, tex_car[0].height, tex_car[0].pixels);
        zsort_mesh(&mesh_car[0]);