X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=dosdemo;a=blobdiff_plain;f=src%2Fscr%2Fraytrace.c;fp=src%2Fscr%2Fraytrace.c;h=3d8465f21de4ab3cf187eb86fb95c83633ee3638;hp=0000000000000000000000000000000000000000;hb=dfc6ebacd7bcc1e6b9e7168c3e4824d241d2d5c8;hpb=0aeee13aa695ec617ec22253824f17209660bd39

diff --git a/src/scr/raytrace.c b/src/scr/raytrace.c
new file mode 100644
index 0000000..3d8465f
--- /dev/null
+++ b/src/scr/raytrace.c
@@ -0,0 +1,104 @@
+#include <stdio.h>
+#include <math.h>
+#include "demo.h"
+#include "screen.h"
+#include "gfxutil.h"
+#include "util.h"
+#include "cgmath/cgmath.h"
+#include "rt.h"
+
+static int init(void);
+static void destroy(void);
+static void start(long trans_time);
+static void draw(void);
+
+static struct screen scr = {
+	"raytrace",
+	init,
+	destroy,
+	start,
+	0,
+	draw
+};
+
+static cgm_vec3 raydir[120][160];
+static struct rtscene scn;
+
+struct screen *raytrace_screen(void)
+{
+	return &scr;
+}
+
+static int init(void)
+{
+	int i, j;
+	float z = 1.0f / tan(cgm_deg_to_rad(25.0f));
+
+	for(i=0; i<120; i++) {
+		cgm_vec3 *vptr = raydir[i];
+		float y = 1.0f - (float)i / 60.0f;
+		for(j=0; j<160; j++) {
+			vptr->x = ((float)j / 80.0f - 1.0f) * 1.333333f;
+			vptr->y = y;
+			vptr->z = z;
+			vptr++;
+		}
+	}
+
+	rt_init(&scn);
+
+	rt_color(1, 0, 0);
+	rt_specular(0.8f, 0.8f, 0.8f);
+	rt_shininess(30.0f);
+	rt_add_sphere(&scn, 0, 0, 0, 1);	/* x,y,z, rad */
+
+	rt_color(0.4, 0.4, 0.4);
+	rt_specular(0, 0, 0);
+	rt_shininess(1);
+	rt_add_plane(&scn, 0, 1, 0, -1);		/* nx,ny,nz, dist */
+
+	rt_color(1, 1, 1);
+	rt_add_light(&scn, -8, 15, -10);
+	return 0;
+}
+
+static void destroy(void)
+{
+	rt_destroy(&scn);
+}
+
+static void start(long start_time)
+{
+}
+
+static void draw(void)
+{
+	int i, j, r, g, b;
+	uint16_t pix, *fbptr = fb_pixels;
+
+	for(i=0; i<120; i++) {
+		for(j=0; j<160; j++) {
+			cgm_ray ray;
+			cgm_vec3 col;
+			ray.dir = raydir[i][j];
+			cgm_vcons(&ray.origin, 0, 0, -5);
+
+			if(ray_trace(&ray, &scn, 0, &col)) {
+				r = cround64(col.x * 255.0f) & 0xff;
+				g = cround64(col.y * 255.0f) & 0xff;
+				b = cround64(col.z * 255.0f) & 0xff;
+				if(r > 255) r = 255;
+				if(g > 255) g = 255;
+				if(b > 255) b = 255;
+				pix = PACK_RGB16(r, g, b);
+			} else {
+				pix = 0;
+			}
+			fbptr[0] = fbptr[1] = fbptr[320] = fbptr[321] = pix;
+			fbptr += 2;
+		}
+		fbptr += 320;
+	}
+
+	swap_buffers(0);
+}