X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=shaderlib%2Fenvironment.glsl;fp=shaderlib%2Fenvironment.glsl;h=b5f0cdfb7f572d7c7ab581a54a7c1a1ff83eabcd;hp=0000000000000000000000000000000000000000;hb=857c2db0fb3112b750b618625649d12e13d9ae1a;hpb=03937c4f58465cb0fe7492feb17f19e81eee6abb

diff --git a/shaderlib/environment.glsl b/shaderlib/environment.glsl
new file mode 100644
index 00000000..b5f0cdfb
--- /dev/null
+++ b/shaderlib/environment.glsl
@@ -0,0 +1,26 @@
+layout(set=0) uniform EnvMap
+{
+	mat3 env_world_matrix;
+};
+
+layout(set=0) uniform samplerCube environment_map;
+layout(set=0) uniform samplerCube irradiance_map;
+
+#pragma MSP stage(fragment)
+virtual vec3 get_environment_sample(vec3 direction, float roughness)
+{
+	float lod = (2-roughness)*roughness*(textureQueryLevels(environment_map)-1);
+	return textureLod(environment_map, env_world_matrix*direction, lod).rgb;
+}
+
+virtual vec3 get_reflection(vec3 normal, vec3 look)
+{
+	vec3 reflect_dir = reflect(look, normal);
+	return get_environment_sample(reflect_dir, 0.0);
+}
+
+virtual vec3 get_irradiance_sample(vec3 normal)
+{
+	return texture(irradiance_map, env_world_matrix*normal).rgb;
+}
+