#version 460

#extension GL_GOOGLE_include_directive : require

#include "bindless.glsl"
#include "scene_data.glsl"
#include "mesh_pcs.glsl"

layout (location = 0) in vec3 inPos;
layout (location = 1) in vec2 inUV;
layout (location = 2) in vec3 inNormal;
layout (location = 3) in vec4 inTangent;
layout (location = 4) in mat3 inTBN;

layout (location = 0) out vec4 outFragColor;

void main()
{
    MaterialData material = pcs.sceneData.materials.data[pcs.materialID];

    vec4 diffuse = sampleTexture2DLinear(material.diffuseTex, inUV) * material.baseColor;
    outFragColor = diffuse;


//    if (diffuse.a < 0.1) {
//        discard;
//    }
//
//    vec3 baseColor = material.baseColor.rgb * diffuse.rgb;
//
//    vec3 normal = normalize(inNormal).rgb;
//    if (inTangent != vec4(0.0)) {
//        // FIXME: sometimes Blender doesn't export tangents for some objects
//        // for some reason. When we will start computing tangents manually,
//        // this check can be removed
//        normal = sampleTexture2DLinear(material.normalTex, inUV).rgb;
//        // normal.y = 1 - normal.y; // flip to make OpenGL normal maps work
//        normal = inTBN * normalize(normal * 2.0 - 1.0);
//        normal = normalize(normal);
//    }
//
//    #ifdef PBR
//    float metallicF = material.metallicRoughnessEmissive.r;
//    float roughnessF = material.metallicRoughnessEmissive.g;
//
//    vec4 metallicRoughness = sampleTexture2DLinear(material.metallicRoughnessTex, inUV);
//
//    float roughness = roughnessF * metallicRoughness.g;
//    // roughness *= roughness; // from perceptual to linear
//    roughness = max(roughness, 1e-2); // 0.0 roughness leads to NaNs
//
//    float metallic = metallicF * metallicRoughness.b;
//
//    vec3 dielectricSpecular = vec3(0.04);
//    vec3 black = vec3(0.0);
//    vec3 diffuseColor = mix(baseColor * (1.0 - dielectricSpecular.r), black, metallic);
//    vec3 f0 = mix(dielectricSpecular, baseColor, metallic);
//    #else
//    vec3 diffuseColor = baseColor;
//    float metallic = 0.f;
//    float roughness = 1.f;
//    vec3 f0 = vec3(0.0);
//    #endif
//
//    vec3 cameraPos = pcs.sceneData.cameraPos.xyz;
//    vec3 fragPos = inPos.xyz;
//    vec3 n = normal;
//    vec3 v = normalize(cameraPos - fragPos);
//
//    // diffuseColor = vec3(1.0);
//    // baseColor = vec3(1.0);
//
//    vec3 fragColor = vec3(0.0);
//    for (int i = 0; i < pcs.sceneData.numLights; i++) {
//        Light light = pcs.sceneData.lights.data[i];
//
//        vec3 l = light.direction;
//        if (light.type != TYPE_DIRECTIONAL_LIGHT) {
//            l = normalize(light.position - fragPos);
//        }
//        float NoL = clamp(dot(n, l), 0.0, 1.0);
//
//        float occlusion = 1.0;
//        if (light.type == TYPE_DIRECTIONAL_LIGHT) {
//            occlusion = calculateCSMOcclusion(
//            fragPos, cameraPos, NoL,
//            pcs.sceneData.csmShadowMapId,
//            pcs.sceneData.cascadeFarPlaneZs,
//            pcs.sceneData.csmLightSpaceTMs);
//        } else if (light.type == TYPE_POINT_LIGHT && light.shadowMapID != 0) {
//            occlusion = calculatePointShadow(
//            fragPos, light.position, NoL,
//            light.shadowMapID,
//            pcs.sceneData.pointLightFarPlane);
//        }
//
//        fragColor += calculateLight(light, fragPos, n, v, l,
//        diffuseColor, roughness, metallic, f0, occlusion);
//    }
//
//    // emissive
//    float emissiveF = material.metallicRoughnessEmissive.b;
//    vec3 emissiveColor = emissiveF * sampleTexture2DLinear(material.emissiveTex, inUV).rgb;
//    fragColor += emissiveColor;
//
//    // ambient
//    fragColor += baseColor * pcs.sceneData.ambientColor * pcs.sceneData.ambientIntensity;
//
//    #if 0
//    // CSM DEBUG
//    uint cascadeIndex = chooseCascade(inPos, cameraPos, pcs.sceneData.cascadeFarPlaneZs);
//    fragColor *= debugShadowsFactor(cascadeIndex);
//    #endif
//
//    #if 0
//    // TANGENT DEBUG
//    if (inTangent == vec4(0.0)) {
//        fragColor = vec3(1.0f, 0.0f, 0.0f);
//    }
//    #endif
//
//    #if 1
//    // NORMAL DEBUG
//    // fragColor = normal;
//    #endif

//    outFragColor = vec4(1.0f, 0.0f, 0.0f, 1.0f);
}