polyadvent

commit ec871f1c4918dcf2ebf5a3b5032c8380c9e10236
parent c2d82552009445893fd84e89c1722e7bb0e32818
Author: William Casarin <jb55@jb55.com>
Date:   Sun,  4 Nov 2018 17:19:23 -0800

shadows glsl

Diffstat:
A
etc/shaders/shadows.glsl
 | 
30
++++++++++++++++++++++++++++++

1 file changed, 30 insertions(+), 0 deletions(-)
diff --git a/etc/shaders/shadows.glsl b/etc/shaders/shadows.glsl
@@ -0,0 +1,30 @@
+
+vec3 shadow_strength(vec4 position, vec4 normal, vec4 v_shadow_coord) {
+    vec3 visibility = vec3(1.0);
+    // vec4 world_space_normal = normalize(normal * normal);
+    // float cos_theta = max(0.0, dot(light_dir, world_space_normal.xyz));
+    // float shadow_normal_offset = 1.0;
+    // float normal_offset_scale = clamp(1.0 - cos_theta, 0.0, 1.0);
+    // normal_offset_scale *= shadow_normal_offset * 0.01;
+    // vec4 shadow_offset = world * (world_space_normal * normal_offset_scale);
+    // vec4 shadow_coord = depth_vp * ((world * position) + shadow_offset);
+    vec4 shadow_sample = texture(shadow_map, v_shadow_coord.xy);
+
+
+    float bias = 0.002;
+    bool in_shadow =
+        shadow_sample.z < v_shadow_coord.z - bias
+        && shadow_sample.y < 1.0;
+
+    if (light_dir.z > 0.0 && in_shadow) {
+        float factor = 1.0/(dot(light_dir, vec3(0.0, 0.0, 1.0)));
+        // float factor = 1.0;
+        visibility = vec3(clamp(0.2 * factor, 0.5, 1.0));
+        // visibility = shadow_sample;
+    }
+
+    // visibility += normal_offset_scale;
+
+
+    return visibility;
+}