foo

[demo_prior] / sdr / whitted.p.glsl

diff --git a/sdr/whitted.p.glsl b/sdr/whitted.p.glsl
new file mode 100644 (file)
index 0000000..567f127
--- /dev/null
+++ b/sdr/whitted.p.glsl
@@ -0,0 +1,43 @@
+varying vec3 v_rorg, v_rdir;
+
+vec3 shade(in vec3 pos, in vec3 norm);
+vec3 backdrop(in vec3 dir);
+float isect_plane(in vec3 ro, in vec3 rd, out vec3 norm_ret);
+
+void main()
+{
+       vec3 rdir = normalize(v_rdir);
+
+       float t = isect_floor(v_rorg, rdir);
+       if(t >= 0.0) {
+               gl_FragColor.rgb = shade(v_rorg + rdir * t, vec3(0.0, 1.0, 0.0));
+       } else {
+               gl_FragColor.rgb = backdrop(rdir);
+       }
+       gl_FragColor.a = 1.0;
+}
+
+vec3 shade(in vec3 pos, in vec3 norm)
+{
+}
+
+vec3 backdrop(in vec3 dir)
+{
+}
+
+float isect_floor(in vec3 ro, in vec3 rd)
+{
+       float t = isect_plane(ro, rd, vec4(0.0, 1.0, 0.0, -1.0));
+       if(t < 0.0) return t;
+
+       vec3 p = ro + rd * t;
+       float d = max(abs(p.x), max(abs(p.y), abs(p.z)));
+       if(d >= 1.0) return -1.0;
+
+       return t;
+}
+
+float isect_plane(in vec3 ro, in vec3 rd, in vec4 plane)
+{
+
+}