9 #include "polyfill.h" /* just for struct pimage */
15 static int init(void);
16 static void destroy(void);
17 static void start(long trans_time);
18 static void draw(void);
19 static void draw_lowres_raster(void);
20 static void keypress(int key);
21 static int gen_texture(struct pimage *img, int xsz, int ysz);
23 static struct screen scr = {
32 static float cam_theta, cam_phi = 25;
33 static float cam_dist = 3;
34 static struct g3d_mesh cube, torus;
35 static struct bsptree torus_bsp;
37 static struct pimage tex;
39 static int use_bsp = 0;
41 #define LOWRES_SCALE 10
42 static uint16_t *lowres_pixels;
43 static int lowres_width, lowres_height;
45 struct screen *polytest_screen(void)
54 gen_cube_mesh(&cube, 1.0, 0);
55 gen_torus_mesh(&torus, 1.0, 0.25, 24, 12);
57 for(i=0; i<torus.vcount; i++) {
58 torus.varr[i].u *= 4.0;
59 torus.varr[i].v *= 2.0;
64 if(bsp_add_mesh(&torus_bsp, &torus) == -1) {
65 fprintf(stderr, "failed to construct torus BSP tree\n");
70 gen_texture(&tex, 64, 64);
73 lowres_width = FB_WIDTH / LOWRES_SCALE;
74 lowres_height = FB_HEIGHT / LOWRES_SCALE;
75 lowres_pixels = malloc(lowres_width * lowres_height * 2);
76 scr.draw = draw_debug;
82 static void destroy(void)
89 destroy_bsp(&torus_bsp);
93 static void start(long trans_time)
95 g3d_matrix_mode(G3D_PROJECTION);
97 g3d_perspective(50.0, 1.3333333, 0.5, 100.0);
99 g3d_enable(G3D_CULL_FACE);
100 g3d_enable(G3D_LIGHTING);
101 g3d_enable(G3D_LIGHT0);
103 g3d_polygon_mode(G3D_GOURAUD);
104 g3d_enable(G3D_TEXTURE_2D);
107 static void update(void)
109 mouse_orbit_update(&cam_theta, &cam_phi, &cam_dist);
113 static void draw(void)
120 memset16(fb_pixels, PACK_RGB16(20, 30, 50), FB_WIDTH * FB_HEIGHT);
122 g3d_matrix_mode(G3D_MODELVIEW);
124 g3d_translate(0, 0, -cam_dist);
126 g3d_mult_matrix(sball_matrix);
128 g3d_rotate(cam_phi, 1, 0, 0);
129 g3d_rotate(cam_theta, 0, 1, 0);
132 g3d_light_dir(0, -10, 10, 10);
133 g3d_mtl_diffuse(1.0, 1.0, 1.0);
134 g3d_set_texture(tex.width, tex.height, tex.pixels);
137 /* calc world-space view direction */
138 mat = g3d_get_matrix(G3D_MODELVIEW, 0);
139 /* transform (0, 0, -1) with transpose(mat3x3) */
144 draw_bsp(&torus_bsp, vdir[0], vdir[1], vdir[2]);
150 /*draw_mesh(&cube);*/
151 swap_buffers(fb_pixels);
154 static void draw_debug(void)
158 memset(lowres_pixels, 0, lowres_width * lowres_height * 2);
160 g3d_matrix_mode(G3D_MODELVIEW);
162 g3d_translate(0, 0, -cam_dist);
163 g3d_rotate(cam_phi, 1, 0, 0);
164 g3d_rotate(cam_theta, 0, 1, 0);
166 g3d_framebuffer(lowres_width, lowres_height, lowres_pixels);
170 draw_lowres_raster();
173 g3d_framebuffer(FB_WIDTH, FB_HEIGHT, fb_pixels);
175 g3d_polygon_mode(G3D_WIRE);
177 g3d_polygon_mode(G3D_FLAT);
179 swap_buffers(fb_pixels);
183 static void draw_huge_pixel(uint16_t *dest, int dest_width, uint16_t color)
186 uint16_t grid_color = PACK_RGB16(127, 127, 127);
188 for(i=0; i<LOWRES_SCALE; i++) {
189 for(j=0; j<LOWRES_SCALE; j++) {
190 dest[j] = i == 0 || j == 0 ? grid_color : color;
196 static void draw_lowres_raster(void)
199 uint16_t *sptr = lowres_pixels;
200 uint16_t *dptr = fb_pixels;
202 for(i=0; i<lowres_height; i++) {
203 for(j=0; j<lowres_width; j++) {
204 draw_huge_pixel(dptr, FB_WIDTH, *sptr++);
205 dptr += LOWRES_SCALE;
207 dptr += FB_WIDTH * LOWRES_SCALE - FB_WIDTH;
211 static void keypress(int key)
216 printf("drawing with %s\n", use_bsp ? "BSP tree" : "z-sorting");
221 static int gen_texture(struct pimage *img, int xsz, int ysz)
226 if(!(img->pixels = malloc(xsz * ysz * sizeof *pix))) {
231 for(i=0; i<ysz; i++) {
232 for(j=0; j<xsz; j++) {
233 int val = (i << 2) ^ (j << 2);
235 uint16_t g = val << 1;
236 uint16_t b = val << 2;
238 *pix++ = PACK_RGB16(r, g, b);