added scene loading

diff --git a/RUN b/RUN
index 7cf8029..ab8273a 100755 (executable)
--- a/RUN
+++ b/RUN
@@ -1,4 +1,4 @@
 #!/bin/sh
 
 rm -f output.ppm
-./csgray $* && display output.ppm
+./csgray scene $* && display output.ppm

diff --git a/scene b/scene
new file mode 100644 (file)
index 0000000..6cf673d
--- /dev/null
+++ b/scene
@@ -0,0 +1,42 @@
+# vi:set ts=4 sts=4 sw=4 ai:
+csgray_scene {
+       viewer {
+               position = [0, 0, 5]
+               target = [0, 0, 0]
+               fov = 50
+       }
+
+       subtract {
+               subtract {
+                       sphere {
+                               position = [0, 0, 0]
+                               radius = 1
+                               color = [1, 0.1, 0.05]
+                               roughness = 0.3
+                       }
+                       sphere {
+                               position = [0.3, 0.7, 0.7]
+                               radius = 0.7
+                               color = [0.2, 0.3, 1]
+                               roughness = 0.3
+                       }
+               }
+               sphere {
+                       position = [-0.9, -0.1, 0.7]
+                       radius = 0.5
+                       color = [1, 0.9, 0.2]
+                       roughness = 0.3
+               }
+       }
+
+       plane {
+               position = [0, -1, 0]
+               normal = [0, 1, 0]
+               color = [0.4, 0.7, 0.4]
+       }
+
+       null {
+               position = [-4, 10, 10]
+               emission = [80, 80, 80]
+       }
+}

diff --git a/src/csgray.c b/src/csgray.c
index 7fc2b46..150f5fb 100644 (file)
--- a/src/csgray.c
+++ b/src/csgray.c
@@ -61,21 +61,32 @@ void csg_fov(float fov)
 int csg_load(const char *fname)
 {
        struct ts_node *root = 0, *c;
+       csg_object *o;
 
        if(!(root = ts_load(fname))) {
                fprintf(stderr, "failed to open %s\n", fname);
                return -1;
        }
-       if(strcmp(root->name, "scene") != 0) {
+       if(strcmp(root->name, "csgray_scene") != 0) {
                fprintf(stderr, "invalid scene file: %s\n", fname);
                goto err;
        }
 
        c = root->child_list;
        while(c) {
-               csg_object *o = load_object(c);
-               if(!o) goto err;
-               csg_add_object(o);
+               if(strcmp(c->name, "viewer") == 0) {
+                       static float def_pos[] = {0, 0, 5};
+                       static float def_targ[] = {0, 0, 0};
+
+                       float *p = ts_get_attr_vec(c, "position", def_pos);
+                       float *t = ts_get_attr_vec(c, "target", def_targ);
+
+                       csg_view(p[0], p[1], p[2], t[0], t[1], t[2]);
+                       csg_fov(ts_get_attr_num(c, "fov", 50.0f));
+
+               } else if((o = load_object(c))) {
+                       csg_add_object(o);
+               }
                c = c->next;
        }
 
@@ -306,6 +317,35 @@ void csg_metallic(csg_object *o, int m)
        o->ob.metallic = m;
 }
 
+void csg_reset_xform(csg_object *o)
+{
+       mat4_identity(o->ob.xform);
+       mat4_identity(o->ob.inv_xform);
+}
+
+void csg_translate(csg_object *o, float x, float y, float z)
+{
+       mat4_translate(o->ob.xform, x, y, z);
+       mat4_pre_translate(o->ob.inv_xform, -x, -y, -z);
+}
+
+void csg_rotate(csg_object *o, float angle, float x, float y, float z)
+{
+       mat4_rotate(o->ob.xform, angle, x, y, z);
+       mat4_pre_rotate(o->ob.inv_xform, -angle, x, y, z);
+}
+
+void csg_scale(csg_object *o, float x, float y, float z)
+{
+       mat4_scale(o->ob.xform, x, y, z);
+       mat4_pre_scale(o->ob.inv_xform, 1.0f / x, 1.0f / y, 1.0f / z);
+}
+
+void csg_lookat(csg_object *o, float x, float y, float z, float tx, float ty, float tz, float ux, float uy, float uz)
+{
+       mat4_lookat(o->ob.xform, x, y, z, tx, ty, tz, ux, uy, uz);
+       mat4_inv_lookat(o->ob.inv_xform, x, y, z, tx, ty, tz, ux, uy, uz);
+}
 
 void csg_render_pixel(int x, int y, int width, int height, float aspect, float *color)
 {
@@ -484,53 +524,115 @@ static int find_intersection(struct ray *ray, struct hit *best)
 
 static csg_object *load_object(struct ts_node *node)
 {
-       float *apos, *arot, *ascale, *acolor;
-       float aroughness;
+       float *avec;
        struct ts_node *c;
-       csg_object *o, *olist = 0, *otail = 0;
-       int num_subobj = 0;
+       csg_object *sub, *o = 0, *olist = 0, *otail = 0;
+       int num_subobj = 0, is_csgop = 0;
 
-       c = node->child_list;
-       while(c) {
-               if((o = load_object(c))) {
-                       if(olist) {
-                               otail->ob.next = o;
-                               otail = o;
-                       } else {
-                               olist = otail = o;
-                       }
-                       ++num_subobj;
+       if(strcmp(node->name, "null") == 0) {
+               if(!(o = csg_null(0, 0, 0))) {
+                       goto err;
                }
-               c = c->next;
-       }
 
-       apos = ts_get_attr_vec(node, "position", 0);
-       arot = ts_get_attr_vec(node, "rotation", 0);
-       ascale = ts_get_attr_vec(node, "scaling", 0);
-       acolor = ts_get_attr_vec(node, "color", 0);
-       aroughness = ts_get_attr_num(node, "roughness", 0);
+       } else if(strcmp(node->name, "sphere") == 0) {
+               float rad = ts_get_attr_num(node, "radius", 1.0f);
+               if(!(o = csg_sphere(0, 0, 0, rad))) {
+                       goto err;
+               }
 
-       if(strcmp(node->name, "null") == 0) {
-               if(num_subobj) {
-                       fprintf(stderr, "null can't have sub-objects\n");
+       } else if(strcmp(node->name, "plane") == 0) {
+               static float def_norm[] = {0, 1, 0};
+               float *norm = ts_get_attr_vec(node, "normal", def_norm);
+               if(!(o = csg_plane(0, 0, 0, norm[0], norm[1], norm[2]))) {
                        goto err;
                }
-               if(!(o = alloc_object(OB_NULL))) {
+
+       } else if(strcmp(node->name, "box") == 0) {
+               static float def_sz[] = {1, 1, 1};
+               float *sz = ts_get_attr_vec(node, "size", def_sz);
+               if(!(o = csg_box(0, 0, 0, sz[0], sz[1], sz[2]))) {
                        goto err;
                }
-               return o;
 
-       } else if(strcmp(node->name, "sphere") == 0) {
-               if(num_subobj) {
-                       fprintf(stderr, "sphere can't have sub-objects\n");
+       } else if(strcmp(node->name, "union") == 0) {
+               if(!(o = csg_union(0, 0))) {
+                       goto err;
+               }
+               is_csgop = 1;
+
+       } else if(strcmp(node->name, "intersect") == 0) {
+               if(!(o = csg_intersection(0, 0))) {
                        goto err;
                }
-               if(!(o = alloc_object(OB_SPHERE))) {
+               is_csgop = 1;
+
+       } else if(strcmp(node->name, "subtract") == 0) {
+               if(!(o = csg_subtraction(0, 0))) {
                        goto err;
                }
+               is_csgop = 1;
+
+       } else {
+               goto err;
        }
 
+       if(is_csgop) {
+               c = node->child_list;
+               while(c) {
+                       if((sub = load_object(c))) {
+                               if(olist) {
+                                       otail->ob.next = sub;
+                                       otail = sub;
+                               } else {
+                                       olist = otail = sub;
+                               }
+                               ++num_subobj;
+                       }
+                       c = c->next;
+               }
+
+               if(num_subobj != 2) {
+                       goto err;
+               }
+               o->un.a = olist;
+               o->un.b = olist->ob.next;
+               olist->ob.next = 0;
+       }
+
+       if((avec = ts_get_attr_vec(node, "position", 0))) {
+               csg_translate(o, avec[0], avec[1], avec[2]);
+       }
+       if((avec = ts_get_attr_vec(node, "rotaxis", 0))) {
+               csg_rotate(o, ts_get_attr_num(node, "rotangle", 0.0f), avec[0], avec[1], avec[2]);
+       }
+       if((avec = ts_get_attr_vec(node, "scaling", 0))) {
+               csg_scale(o, avec[0], avec[1], avec[2]);
+       }
+       if((avec = ts_get_attr_vec(node, "target", 0))) {
+               /* don't move this before position */
+               float def_up[] = {0, 1, 0};
+               float *up = ts_get_attr_vec(node, "up", def_up);
+               float x = o->ob.xform[12];
+               float y = o->ob.xform[13];
+               float z = o->ob.xform[14];
+               csg_lookat(o, x, y, z, avec[0], avec[1], avec[2], up[0], up[1], up[2]);
+       }
+
+       if((avec = ts_get_attr_vec(node, "color", 0))) {
+               csg_color(o, avec[0], avec[1], avec[2]);
+       }
+       if((avec = ts_get_attr_vec(node, "emission", 0))) {
+               csg_emission(o, avec[0], avec[1], avec[2]);
+       }
+
+       csg_roughness(o, ts_get_attr_num(node, "roughness", o->ob.roughness));
+       csg_opacity(o, ts_get_attr_num(node, "opacity", o->ob.opacity));
+       csg_metallic(o, ts_get_attr_int(node, "metallic", o->ob.metallic));
+
+       return o;
+
 err:
+       csg_free_object(o);
        while(olist) {
                o = olist;
                olist = olist->ob.next;

diff --git a/src/csgray.h b/src/csgray.h
index 5e6fc31..5d0cf26 100644 (file)
--- a/src/csgray.h
+++ b/src/csgray.h
@@ -34,6 +34,12 @@ void csg_roughness(csg_object *o, float r);
 void csg_opacity(csg_object *o, float p);
 void csg_metallic(csg_object *o, int m);
 
+void csg_reset_xform(csg_object *o);
+void csg_translate(csg_object *o, float x, float y, float z);
+void csg_rotate(csg_object *o, float angle, float x, float y, float z);
+void csg_scale(csg_object *o, float x, float y, float z);
+void csg_lookat(csg_object *o, float x, float y, float z, float tx, float ty, float tz, float ux, float uy, float uz);
+
 void csg_render_pixel(int x, int y, int width, int height, float aspect, float *color);
 void csg_render_image(float *pixels, int width, int height);
 

diff --git a/src/main.c b/src/main.c
index 93c7442..6e69844 100644 (file)
--- a/src/main.c
+++ b/src/main.c
@@ -16,6 +16,7 @@ static int parse_opt(int argc, char **argv);
 static int width = DFL_WIDTH, height = DFL_HEIGHT;
 static float inv_gamma = 1.0f / DFL_GAMMA;
 static const char *out_fname = DFL_OUTFILE;
+static const char *in_fname;
 
 int main(int argc, char **argv)
 {
@@ -30,11 +31,16 @@ int main(int argc, char **argv)
                return 1;
        }
 
+       if(csg_load(in_fname) == -1) {
+               return 1;
+       }
+
        if(!(pixels = malloc(width * height * 3 * sizeof *pixels))) {
                perror("failed to allocate framebuffer");
                return 1;
        }
 
+       /*
        csg_view(0, 0, 5, 0, 0, 0);
 
        oa = csg_sphere(0, 0, 0, 1);
@@ -62,6 +68,7 @@ int main(int argc, char **argv)
        obj = csg_null(-4, 10, 10);
        csg_emission(obj, 80, 80, 80);
        csg_add_object(obj);
+       */
 
        csg_render_image(pixels, width, height);
        save_image(out_fname, pixels, width, height);
@@ -149,9 +156,18 @@ static int parse_opt(int argc, char **argv)
                                return -1;
                        }
                } else {
-                       fprintf(stderr, "unexpected argument: %s\n", argv[i]);
-                       return -1;
+                       if(in_fname) {
+                               fprintf(stderr, "unexpected argument: %s\n", argv[i]);
+                               return -1;
+                       }
+                       in_fname = argv[i];
                }
        }
+
+       if(!in_fname) {
+               fprintf(stderr, "you need to pass a scene file to read\n");
+               return -1;
+       }
+
        return 0;
 }