OpenGL lighting

resources/EngineResources/GLShaders/scene_frag_deferred.glsl

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+#version 450
+
+const int MAX_TEXTURES = 256;
+
+out vec4 outPos;
+out vec3 outNormal;
+out vec3 outTangent;
+out vec3 outBitangent;
+out vec2 outTextCoords;
+
+out vec4 outAlbedo ;
+out vec4 outPosition;
+out vec4 outNormals;
+out vec4 outPBR;
+
+struct Material {
+    vec4 diffuse;
+    int hasTexture;
+    int hasNormalMap;
+    int hasRoughMap;
+    float roughnessFactor;
+    float metallicFactor;
+};
+
+uniform sampler2D textureSampler;
+uniform sampler2D normalSampler;
+uniform sampler2D roughnessSampler;
+uniform Material material;
+
+vec3 calcNormal(Material material, vec3 normal, vec2 textCoords, mat3 TBN)
+{
+    vec3 newNormal = normal;
+    if (material.hasNormalMap > 0)
+    {
+        newNormal = texture(normalSampler, textCoords).rgb;
+        newNormal = normalize(newNormal * 2.0 - 1.0);
+        newNormal = normalize(TBN * newNormal);
+    }
+    return newNormal;
+}
+
+layout(push_constant) uniform pc {
+    layout(offset = 64) uint materialIdx;
+} push_constants;
+
+void main()
+{
+    outPosition = outPos;
+
+    if (material.hasTexture == 1) {
+        outAlbedo = texture(textureSampler, outTextCoords);
+    } else {
+        outAlbedo = material.diffuse;
+    }
+
+
+    if(outAlbedo.a < 0.5) discard;
+
+    mat3 TBN = mat3( outTangent,  outBitangent,  outNormal);
+    vec3 newNormal = calcNormal(material,  outNormal,  outTextCoords, TBN);
+    outNormals = vec4(newNormal, 1.0f);
+
+    float ao = 0.5f;
+    float roughnessFactor = 0.0f;
+    float metallicFactor = 0.0f;
+    if (material.hasRoughMap > 0) {
+        vec4 metRoughValue = texture(roughnessSampler,  outTextCoords);
+        roughnessFactor = metRoughValue.g;
+        metallicFactor = metRoughValue.b;
+    } else {
+        roughnessFactor = material.roughnessFactor;
+        metallicFactor = material.metallicFactor;
+    }
+
+    outPBR = vec4(ao, roughnessFactor, metallicFactor, 1.0f);
+
+}