From: John Tsiombikas <nuclear@member.fsf.org>
Date: Fri, 4 Dec 2020 14:25:36 +0000 (+0200)
Subject: foo
X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=demo_prior;a=commitdiff_plain;h=a89e74326444df1da625ad9614919bb7ad2352cb

foo
---

diff --git a/sdr/whitted.p.glsl b/sdr/whitted.p.glsl
new file mode 100644
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)
+{
+
+}
diff --git a/sdr/whitted.v.glsl b/sdr/whitted.v.glsl
new file mode 100644
index 0000000..ad2878e
--- /dev/null
+++ b/sdr/whitted.v.glsl
@@ -0,0 +1,13 @@
+#define FOV	0.873	/* about 50 deg */
+
+varying vec3 v_rorg, v_rdir;
+
+void main()
+{
+	gl_Position = gl_Vertex;
+
+	float dist = 1.0 / tan(FOV / 2.0);
+	vec3 dir = vec3(gl_MultiTexCoord0.xy * 2.0 - 1.0, dist);
+	v_rdir = gl_NormalMatrix * dir;
+	v_rorg = (gl_ModelViewMatrix * vec4(0.0, 0.0, 0.0, 1.0)).xyz;
+}