add pbr light shader

shader/DirectionLight.frag

@@ -27,7 +27,6 @@ layout(binding=1) uniform ColorMaterial
     vec4 ambient;
 } color_material;
 
-
 layout(binding=2) uniform Sun
 {
     vec3 direction;

shader/pbr_DirectionLight.frag

@@ -0,0 +1,117 @@
+#version 450 core
+
+layout(location=0) in vec3 FragmentWorldPos;
+layout(location=1) in vec3 FragmentWorldNormal;
+
+layout(location=0) out vec4 FragColor;
+
+layout(binding=10) uniform WorldMatrix     // hgl/math/Math.h
+{
+    mat4 ortho;
+
+    mat4 projection;
+    mat4 inverse_projection;
+
+    mat4 modelview;
+    mat4 inverse_modelview;
+
+    mat4 mvp;
+    mat4 inverse_mvp;
+
+    vec4 camera_pos;
+    vec2 canvas_resolution;
+    vec2 viewport_resolution;
+}fs_world;
+
+layout(binding=1) uniform PBRMaterial
+{
+    vec4 color;
+    float metallic;
+    float roughness;
+} pbr_material;
+
+layout(binding=2) uniform Sun
+{
+    vec3 direction;
+}sun;
+
+const float PI = 3.14159265359;
+
+// Normal Distribution function --------------------------------------
+float D_GGX(float dotNH, float roughness)
+{
+	float alpha = roughness * roughness;
+	float alpha2 = alpha * alpha;
+	float denom = dotNH * dotNH * (alpha2 - 1.0) + 1.0;
+	return (alpha2)/(PI * denom*denom);
+}
+
+// Geometric Shadowing function --------------------------------------
+float G_SchlicksmithGGX(float dotNL, float dotNV, float roughness)
+{
+	float r = (roughness + 1.0);
+	float k = (r*r) / 8.0;
+	float GL = dotNL / (dotNL * (1.0 - k) + k);
+	float GV = dotNV / (dotNV * (1.0 - k) + k);
+	return GL * GV;
+}
+
+// Fresnel function ----------------------------------------------------
+vec3 F_Schlick(float cosTheta, float metallic)
+{
+	vec3 F0 = mix(vec3(0.04), pbr_material.color.rgb, metallic); // * material.specular
+	vec3 F = F0 + (1.0 - F0) * pow(1.0 - cosTheta, 5.0);
+	return F;
+}
+
+// Specular BRDF composition --------------------------------------------
+
+vec3 BRDF(vec3 L, vec3 V, vec3 N, float metallic, float roughness)
+{
+	// Precalculate vectors and dot products
+	vec3 H = normalize (V + L);
+	float dotNV = clamp(dot(N, V), 0.0, 1.0);
+	float dotNL = clamp(dot(N, L), 0.0, 1.0);
+	float dotLH = clamp(dot(L, H), 0.0, 1.0);
+	float dotNH = clamp(dot(N, H), 0.0, 1.0);
+
+	// Light color fixed
+	vec3 lightColor = vec3(1.0);
+
+	vec3 color = vec3(0.0);
+
+	if (dotNL > 0.0)
+	{
+		float rroughness = max(0.05, roughness);
+		// D = Normal distribution (Distribution of the microfacets)
+		float D = D_GGX(dotNH, roughness);
+		// G = Geometric shadowing term (Microfacets shadowing)
+		float G = G_SchlicksmithGGX(dotNL, dotNV, roughness);
+		// F = Fresnel factor (Reflectance depending on angle of incidence)
+		vec3 F = F_Schlick(dotNV, metallic);
+
+		vec3 spec = D * F * G / (4.0 * dotNL * dotNV);
+
+		color += spec * dotNL * lightColor;
+	}
+
+	return color;
+}
+
+// ----------------------------------------------------------------------------
+void main()
+{
+	vec3 N = normalize(FragmentWorldNormal);
+	vec3 V = normalize(fs_world.camera_pos.xyz - FragmentWorldPos);
+
+	// Specular contribution
+    vec3 Lo = BRDF(sun.direction, V, N, pbr_material.metallic, pbr_material.roughness);
+
+	// Combine with ambient
+	vec3 color = (pbr_material.color.rgb * 0.02)+Lo;
+
+	// Gamma correct
+	color = pow(color, vec3(0.4545));
+
+	FragColor = vec4(color, 1.0);
+}

shader/pbr_Light.vert

@@ -0,0 +1,37 @@
+#version 450
+
+layout(location = 0) in vec3 Vertex;
+layout(location = 1) in vec3 Normal;
+
+layout(binding=0) uniform WorldMatrix     // hgl/math/Math.h
+{
+    mat4 ortho;
+
+    mat4 projection;
+    mat4 inverse_projection;
+
+    mat4 modelview;
+    mat4 inverse_modelview;
+
+    mat4 mvp;
+    mat4 inverse_mvp;
+
+    vec4 view_pos;
+    vec2 canvas_resolution;
+    vec2 viewport_resolution;
+}world;
+
+layout(push_constant) uniform Consts {
+    mat4 local_to_world;
+}pc;
+
+layout(location=0) out vec3 FragmentWorldPos;
+layout(location=1) out vec3 FragmentWorldNormal;
+
+void main()
+{
+	FragmentWorldPos = Vertex*mat3(pc.local_to_world);
+	FragmentWorldNormal = Normal*mat3(pc.local_to_world);
+
+	gl_Position =  vec4(FragmentWorldPos,1.0)*world.mvp;
+}