Math fixes, SSR enhancements, improved precision and image sharpness, moved envmap into its own shader to improve SSR realism. Various improvements.

leenkx/Shaders/std/environment_sample.glsl

@@ -0,0 +1,28 @@
+#ifndef _ENVIRONMENT_SAMPLE_GLSL_
+#define _ENVIRONMENT_SAMPLE_GLSL_
+
+// Sample diffuse ambient environment lighting (irradiance)
+vec3 sampleDiffuseEnvironment(vec3 normal) {
+#ifdef _Irr
+    vec3 envl = shIrradiance(normal, shirr);
+
+    #ifdef _EnvTex
+    envl /= PI;
+    #endif
+
+    return envl;
+#else
+    return vec3(0.0);
+#endif
+}
+
+// Sample specular environment reflection (skybox or cubemap)
+vec3 sampleSpecularEnvironment(vec3 viewDir, float roughness) {
+#ifdef _EnvTex
+    return textureLod(texEnvironment, viewDir, roughness * 8.0).rgb;
+#else
+    return vec3(0.0);
+#endif
+}
+
+#endif