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https://github.com/antopilo/Nuake.git
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532 lines
19 KiB
GLSL
532 lines
19 KiB
GLSL
#shader vertex
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#version 460 core
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// Have you ever seen Godot shader. The whole engine has ONE monolithic shader.
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// Also, how do you want me to split this in multiple shaders lmao.
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// Click upper right Round thing
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// DO CODE REVIEW yep
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// im following u daddy
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layout(location = 0) in vec3 VertexPosition;
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layout(location = 1) in vec2 UVPosition;
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layout(location = 2) in vec3 Normal;
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layout(location = 3) in vec3 Tangent;
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layout(location = 4) in vec3 Bitangent;
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out flat vec2 v_UVPosition;
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out flat float v_TextureId;
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out vec3 v_Normal;
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out vec3 v_FragPos;
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out vec3 v_ViewPos;
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out mat3 v_TBN;
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out mat3 v_WTBN;
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out vec3 v_Tangent;
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out vec3 v_Bitangent;
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uniform mat4 u_Projection;
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uniform mat4 u_View;
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uniform mat4 u_Model;
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uniform mat3 u_NormalMatrix;
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void main()
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{
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mat3 normalMatrix = mat3(transpose(inverse(u_Model)));
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v_Normal = vec3(vec4(Normal, 1.0f));
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vec3 N = normalize((u_Model * vec4(Normal, 0.0f)).xyz);
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vec3 T = normalize((u_Model * vec4(Tangent, 0.0f)).xyz);
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vec3 B = normalize((u_Model * vec4(Bitangent, 0.0f)).xyz);
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v_TBN = mat3(T, B, N);
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v_Tangent = T;
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v_Bitangent = B;
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v_UVPosition = UVPosition;
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gl_Position = u_Projection * u_View * u_Model * vec4(VertexPosition, 1.0f);
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v_FragPos = vec3(u_Model * vec4(VertexPosition, 1.0f));
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v_ViewPos = VertexPosition;
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}
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#shader fragment
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#version 460 core
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struct Light {
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int Type; // 0 = directional, 1 = point
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vec3 Direction;
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vec3 Color;
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float Strength;
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vec3 Position;
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float ConstantAttenuation;
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float LinearAttenuation;
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float QuadraticAttenuation;
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mat4 LightTransform;
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sampler2D ShadowMap;
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sampler2D RSMFlux;
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sampler2D RSMNormal;
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sampler2D RSMPos;
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int Volumetric;
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};
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out vec4 FragColor;
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// Textures
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uniform sampler2D u_Textures[2];
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const int MaxLight = 20;
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uniform int LightCount = 0;
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uniform Light Lights[MaxLight];
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// Debug
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uniform int u_ShowNormal;
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// Lighting
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uniform vec3 u_AmbientColor;
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uniform vec4 u_LightColor;
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uniform vec3 u_LightDirection;
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uniform float u_Exposure;
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// Material
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uniform vec3 albedo;
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uniform float metallic;
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uniform float roughness;
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uniform float ao;
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// Specular
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uniform samplerCube u_Skybox;
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uniform samplerCube u_IrradianceMap;
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uniform float u_Shininess;
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uniform float u_Strength;
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uniform vec3 u_EyePosition;
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// IBL
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uniform samplerCube irradianceMap;
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uniform samplerCube prefilterMap;
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uniform sampler2D brdfLUT;
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// Material
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uniform int u_HasAlbedo; // I would advise against doing this stuff. just need default normal which is 0.5f 0.5f 1.0f.
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uniform sampler2D m_Albedo; // yeah just think about it // normal maps are in tangent space which means the default should be a vector pointing straight towards the camera right? ie 0.0, 0.0, 1.0
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uniform vec3 m_AlbedoColor;
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uniform int u_HasMetalness; // But normal maps can also contain colors where the vectors face away such as vec3(0.2, 0.4, -1.0f) right? yeah
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uniform sampler2D m_Metalness; // Well normal maps are stored as colors so you can't have negative values. So they are mapped from the range of -1 to 1, to 0 to 1
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uniform float u_MetalnessValue;
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uniform int u_HasRoughness; // That is why you do the [normal * 2.0f - 1.0f]; to put it into to range of -1 to 1. yeah 0 - 1 -> -1 - 1
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uniform sampler2D m_Roughness; // So vec3(0.0, 0.0, 1.0) put into the range of 0 to 1 is (0.5, 0.5, 1.0). easy.
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uniform float u_RoughnessValue;
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uniform int u_HasAO;
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uniform sampler2D m_AO;
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uniform float u_AOValue;
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uniform int u_HasNormal;
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uniform sampler2D m_Normal;
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uniform int u_HasDisplacement;
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uniform sampler2D m_Displacement;
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in vec3 v_FragPos;
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in vec3 v_ViewPos;
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in vec2 v_UVPosition;
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in flat vec3 v_Normal;
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in mat3 v_TBN;
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in flat float v_TextureId;
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in vec3 v_Tangent;
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in vec3 v_Bitangent;
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const float PI = 3.141592653589793f; // mark this as static const wait idk if you can do that in glsl
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float height_scale = 0.00f;
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vec2 ParallaxMapping(vec2 texCoords, vec3 viewDir) // nice never done this // its easy Af its basicalyy returns a uv coords . that u use everywhere
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{
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// number of depth layers
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const float minLayers = 8.0;
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const float maxLayers = 64.0;
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float numLayers = mix(maxLayers, minLayers, max(dot(vec3(0.0, 0.0, 1.0), viewDir), 0.0));
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// calculate the size of each layer
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float layerDepth = 1.0 / numLayers;
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// depth of current layer
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float currentLayerDepth = 0.0;
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// the amount to shift the texture coordinates per layer (from vector P)
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vec2 P = viewDir.xy * height_scale;
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vec2 deltaTexCoords = P / numLayers;
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// get initial values
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vec2 currentTexCoords = texCoords;
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float currentDepthMapValue = texture(m_Displacement, currentTexCoords).r;
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while (currentLayerDepth < currentDepthMapValue)
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{
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// shift texture coordinates along direction of P
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currentTexCoords -= deltaTexCoords;
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// get depthmap value at current texture coordinates
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currentDepthMapValue = texture(m_Displacement, currentTexCoords).r;
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// get depth of next layer
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currentLayerDepth += layerDepth;
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}
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vec2 prevTexCoords = currentTexCoords + deltaTexCoords;
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// get depth after and before collision for linear interpolation
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float afterDepth = currentDepthMapValue - currentLayerDepth;
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float beforeDepth = texture(m_Displacement, prevTexCoords).r - currentLayerDepth + layerDepth;
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// interpolation of texture coordinates
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float weight = afterDepth / (afterDepth - beforeDepth);
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vec2 finalTexCoords = prevTexCoords * weight + currentTexCoords * (1.0 - weight);
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return finalTexCoords;
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//float height = 1.0f - texture(m_Displacement, texCoords).r;
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//vec2 p = viewDir.xy / viewDir.z * (height * height_scale);
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//return texCoords - p;
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}
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float DistributionGGX(vec3 N, vec3 H, float a)
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{
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float a2 = a * a;
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float NdotH = max(dot(N, H), 0.0);
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float NdotH2 = NdotH * NdotH;
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float nom = a2;
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float denom = (NdotH2 * (a2 - 1.0) + 1.0);
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denom = PI * denom * denom;
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return nom / denom;
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}
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float GeometrySchlickGGX(float NdotV, float k)
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{
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float nom = NdotV;
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float denom = NdotV * (1.0 - k) + k;
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return nom / denom;
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}
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float GeometrySmith(vec3 N, vec3 V, vec3 L, float k)
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{
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float NdotV = max(dot(N, V), 0.0);
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float NdotL = max(dot(N, L), 0.0);
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float ggx1 = GeometrySchlickGGX(NdotV, k);
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float ggx2 = GeometrySchlickGGX(NdotL, k);
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return ggx1 * ggx2;
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}
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vec3 fresnelSchlick(float cosTheta, vec3 F0)
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{
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return F0 + (1.0 - F0) * pow(max(1.0 - cosTheta, 0.0), 5.0);
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}
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vec3 fresnelSchlickRoughness(float cosTheta, vec3 F0, float roughness)
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{
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return F0 + (max(vec3(1.0 - roughness), F0) - F0) * pow(max(1.0 - cosTheta, 0.0), 5.0);
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}
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float ShadowCalculation(vec4 fragPosLightSpace, sampler2D shadowMap, vec3 normal, vec3 lightDir)
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{
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// perform perspective divide
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vec3 projCoords = fragPosLightSpace.xyz / fragPosLightSpace.w;
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// transform to [0,1] range
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projCoords = projCoords * 0.5 + 0.5;
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// get closest depth value from light's perspective (using [0,1] range fragPosLight as coords)
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float closestDepth = texture(shadowMap, projCoords.xy).r;
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// get depth of current fragment from light's perspective
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float currentDepth = projCoords.z;
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// check whether current frag pos is in shadow
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float bias = max(0.005 * (1.0 - dot(normal, lightDir)), 0.0005);
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float shadow = 0.0;
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vec2 texelSize = 1.0 / textureSize(shadowMap, 0);
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for (int x = -1; x <= 1; ++x)
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{
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for (int y = -1; y <= 1; ++y)
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{
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float pcfDepth = texture(shadowMap, projCoords.xy + vec2(x, y) * texelSize).r;
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shadow += currentDepth - bias > pcfDepth ? 1.0 : 0.0;
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}
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}
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shadow /= 9.0;
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return shadow;
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}
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uniform float u_FogAmount;
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// Mie scaterring approximated with Henyey-Greenstein phase function.
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float ComputeScattering(float lightDotView)
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{
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float result = 1.0f - u_FogAmount * u_FogAmount;
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result /= (4.0f * PI * pow(1.0f + u_FogAmount * u_FogAmount - (2.0f * u_FogAmount) * lightDotView, 1.5f));
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return result;
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}
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uniform float u_FogStepCount;
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vec3 ComputeVolumetric(vec3 FragPos, mat4 LightTransform, vec3 LightColor, sampler2D shadowMap, vec3 LightDirection)
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{
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// world space frag position.
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vec3 startPosition = u_EyePosition; // Camera Position
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vec3 rayVector = FragPos - startPosition; // Ray Direction
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float rayLength = length(rayVector); // Length of the raymarched
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float stepLength = rayLength / u_FogStepCount; // Step length
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vec3 rayDirection = rayVector / rayLength;
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vec3 step = rayDirection * stepLength; // Normalized to step length direction
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vec3 currentPosition = startPosition; // First step position
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vec3 accumFog = vec3(0.0f, 0.0f, 0.0f); // accumulative color
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// Raymarching
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for (int i = 0; i < u_FogStepCount; i++)
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{
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vec4 fragPosLightSpace = LightTransform * vec4(currentPosition, 1.0f);
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// perform perspective divide
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vec3 projCoords = fragPosLightSpace.xyz / fragPosLightSpace.w;
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// transform to [0,1] range
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projCoords = projCoords * 0.5 + 0.5;
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float currentDepth = projCoords.z;
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// get closest depth value from light's perspective (using [0,1] range fragPosLight as coords)
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vec2 texelSize = 1.0 / textureSize(shadowMap, 0);
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float closestDepth = texture(shadowMap, projCoords.xy).r;
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if (closestDepth > currentDepth)
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accumFog += (ComputeScattering(dot(rayDirection, LightDirection)).xxx * LightColor);
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currentPosition += step;
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}
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accumFog /= u_FogStepCount;
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return accumFog;
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}
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// Reflective shadow maps constants.
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const uint N_SAMPLES = 64;
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const float R_MAX = 0.001; // Maximum sampling radius.
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const float RSM_INTENSITY = 0.7;
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/**
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* Compute indirect lighting from pixels in the surroundings of current fragment.
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* @param uvFrag Current fragment's projected coordinates in light space (texture).
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* @param n Normalized normal vector to current fragment in world space coordinates.
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* @param x Fragment position in world space coordinates.
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*/
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vec3 indirectLighting(vec3 n, vec3 x, Light light)
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{
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vec2 poissonDisk[64];
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poissonDisk[0] = vec2(-0.613392, 0.617481);
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poissonDisk[1] = vec2(0.170019, -0.040254);
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poissonDisk[2] = vec2(-0.299417, 0.791925);
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poissonDisk[3] = vec2(0.645680, 0.493210);
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poissonDisk[4] = vec2(-0.651784, 0.717887);
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poissonDisk[5] = vec2(0.421003, 0.027070);
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poissonDisk[6] = vec2(-0.817194, -0.271096);
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poissonDisk[7] = vec2(-0.705374, -0.668203);
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poissonDisk[8] = vec2(0.977050, -0.108615);
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poissonDisk[9] = vec2(0.063326, 0.142369);
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poissonDisk[10] = vec2(0.203528, 0.214331);
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poissonDisk[11] = vec2(-0.667531, 0.326090);
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poissonDisk[12] = vec2(-0.098422, -0.295755);
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poissonDisk[13] = vec2(-0.885922, 0.215369);
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poissonDisk[14] = vec2(0.566637, 0.605213);
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poissonDisk[15] = vec2(0.039766, -0.396100);
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poissonDisk[16] = vec2(0.751946, 0.453352);
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poissonDisk[17] = vec2(0.078707, -0.715323);
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poissonDisk[18] = vec2(-0.075838, -0.529344);
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poissonDisk[19] = vec2(0.724479, -0.580798);
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poissonDisk[20] = vec2(0.222999, -0.215125);
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poissonDisk[21] = vec2(-0.467574, -0.405438);
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poissonDisk[22] = vec2(-0.248268, -0.814753);
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poissonDisk[23] = vec2(0.354411, -0.887570);
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poissonDisk[24] = vec2(0.175817, 0.382366);
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poissonDisk[25] = vec2(0.487472, -0.063082);
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poissonDisk[26] = vec2(-0.084078, 0.898312);
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poissonDisk[27] = vec2(0.488876, -0.783441);
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poissonDisk[28] = vec2(0.470016, 0.217933);
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poissonDisk[29] = vec2(-0.696890, -0.549791);
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poissonDisk[30] = vec2(-0.149693, 0.605762);
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poissonDisk[31] = vec2(0.034211, 0.979980);
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poissonDisk[32] = vec2(0.503098, -0.308878);
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poissonDisk[33] = vec2(-0.016205, -0.872921);
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poissonDisk[34] = vec2(0.385784, -0.393902);
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poissonDisk[35] = vec2(-0.146886, -0.859249);
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poissonDisk[36] = vec2(0.643361, 0.164098);
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poissonDisk[37] = vec2(0.634388, -0.049471);
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poissonDisk[38] = vec2(-0.688894, 0.007843);
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poissonDisk[39] = vec2(0.464034, -0.188818);
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poissonDisk[40] = vec2(-0.440840, 0.137486);
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poissonDisk[41] = vec2(0.364483, 0.511704);
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poissonDisk[42] = vec2(0.034028, 0.325968);
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poissonDisk[43] = vec2(0.099094, -0.308023);
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poissonDisk[44] = vec2(0.693960, -0.366253);
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poissonDisk[45] = vec2(0.678884, -0.204688);
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poissonDisk[46] = vec2(0.001801, 0.780328);
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poissonDisk[47] = vec2(0.145177, -0.898984);
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poissonDisk[48] = vec2(0.062655, -0.611866);
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poissonDisk[49] = vec2(0.315226, -0.604297);
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poissonDisk[50] = vec2(-0.780145, 0.486251);
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poissonDisk[51] = vec2(-0.371868, 0.882138);
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poissonDisk[52] = vec2(0.200476, 0.494430);
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poissonDisk[53] = vec2(-0.494552, -0.711051);
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poissonDisk[54] = vec2(0.612476, 0.705252);
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poissonDisk[55] = vec2(-0.578845, -0.768792);
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poissonDisk[56] = vec2(-0.772454, -0.090976);
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poissonDisk[57] = vec2(0.504440, 0.372295);
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poissonDisk[58] = vec2(0.155736, 0.065157);
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poissonDisk[59] = vec2(0.391522, 0.849605);
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poissonDisk[60] = vec2(-0.620106, -0.328104);
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poissonDisk[61] = vec2(0.789239, -0.419965);
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poissonDisk[62] = vec2(-0.545396, 0.538133);
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poissonDisk[63] = vec2(-0.178564, -0.596057);
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vec4 fragPosLightSpace = light.LightTransform * vec4(x, 1.0f);
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// perform perspective divide
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vec3 projCoords = fragPosLightSpace.xyz / fragPosLightSpace.w;
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// transform to [0,1] range
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projCoords = projCoords * 0.5 + 0.5;
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vec3 rsmShading = vec3(0);
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for (int i = 0; i < N_SAMPLES; i++) // Sum contributions of sampling locations.
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{
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vec2 uv = projCoords.xy + poissonDisk[i] * R_MAX;
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vec3 flux = texture(light.RSMFlux, uv).rgb; // Collect components from corresponding RSM textures.
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vec3 x_p = texture(light.RSMPos, uv).xyz; // Position (x_p) and normal (n_p) are in world coordinates too.
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vec3 n_p = texture(light.RSMNormal, uv).xyz;
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float closestDepth = texture(light.ShadowMap, projCoords.xy).r;
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float currentDepth = projCoords.z;
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vec3 E_p = flux * ((max(0, dot(n_p, x - x_p)) * max(0, dot(n , x_p - x))) / pow(length(x - x_p), 4));
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//E_p *= poissonDisk[i].x * poissonDisk[i].x;
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rsmShading += E_p;
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}
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return rsmShading * RSM_INTENSITY; // Modulate result with some intensity value.
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}
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void main()
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{
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// Parallax UV offset.
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vec3 tangentViewPos = v_TBN * u_EyePosition;
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vec3 tangentFragPos = v_TBN * v_FragPos;
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vec3 viewDir = normalize(tangentViewPos - tangentFragPos);
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vec2 texCoords = ParallaxMapping(v_UVPosition, viewDir);
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vec2 finalTexCoords = texCoords;
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vec3 finalAlbedo = m_AlbedoColor;
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if(u_HasAlbedo == 1)
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finalAlbedo = texture(m_Albedo, finalTexCoords).rgb;
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float finalRoughness = u_RoughnessValue;
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if (u_HasRoughness == 1)
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finalRoughness = texture(m_Roughness, finalTexCoords).r;
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float finalMetalness = u_MetalnessValue;
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if (u_HasMetalness == 1)
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finalMetalness = texture(m_Metalness, finalTexCoords).r;
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float finalAO = u_AOValue;
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if (u_HasAO == 1)
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finalAO = texture(m_AO, finalTexCoords).r;
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vec3 finalNormal = texture(m_Normal, finalTexCoords).rgb;
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finalNormal = finalNormal * 2.0 - 1.0;
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finalNormal = v_TBN * normalize(finalNormal);
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vec3 N = normalize(finalNormal);
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vec3 V = normalize(u_EyePosition - v_FragPos);
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vec3 R = reflect(-V, N);
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vec3 F0 = vec3(0.04);
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F0 = mix(F0, finalAlbedo, finalMetalness);
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// reflectance equation
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vec3 Lo = vec3(0.0);
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vec3 eyeDirection = normalize(u_EyePosition - v_FragPos);
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vec3 Fog = vec3(0.0);
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vec3 eColor = vec3(0);
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for (int i = 0; i < LightCount; i++)
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{
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vec3 L = normalize(Lights[i].Position - v_FragPos);
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float distance = length(Lights[i].Position - v_FragPos);
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float attenuation = 1.0 / (distance * distance);
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if (Lights[i].Type == 0) {
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L = Lights[i].Direction;
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attenuation = 1.0f;
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if (Lights[i].Volumetric == 1)
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Fog += ComputeVolumetric(v_FragPos, Lights[i].LightTransform, Lights[i].Color, Lights[i].ShadowMap, Lights[i].Direction);
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//eColor = indirectLighting(N, v_FragPos, Lights[i]);
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}
|
|
float shadow = ShadowCalculation(Lights[i].LightTransform * vec4(v_FragPos, 1.0f), Lights[i].ShadowMap, N, Lights[i].Direction);
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vec3 H = normalize(V + L);
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vec3 radiance = Lights[i].Color * attenuation * (1.f - shadow) ;
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radiance += eColor;
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|
// Cook-Torrance BRDF
|
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float NDF = DistributionGGX(N, H, finalRoughness);
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float G = GeometrySmith(N, V, L, finalRoughness);
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|
vec3 F = fresnelSchlick(max(dot(H, V), 0.0), F0);
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|
|
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vec3 nominator = NDF * G * F;
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|
float denominator = 4 * max(dot(N, V), 0.0) * max(dot(N, L), 0.0) + 0.001; // 0.001 to prevent divide by zero.
|
|
vec3 specular = nominator / denominator;
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|
|
|
// kS is equal to Fresnel
|
|
vec3 kS = F;
|
|
// for energy conservation, the diffuse and specular light can't
|
|
// be above 1.0 (unless the surface emits light); to preserve this
|
|
// relationship the diffuse component (kD) should equal 1.0 - kS.
|
|
vec3 kD = vec3(1.0) - kS;
|
|
// multiply kD by the inverse metalness such that only non-metals
|
|
// have diffuse lighting, or a linear blend if partly metal (pure metals
|
|
// have no diffuse light).
|
|
kD *= 1.0 - finalMetalness;
|
|
|
|
// scale light by NdotL
|
|
float NdotL = max(dot(N, L), 0.0);
|
|
|
|
// add to outgoing radiance Lo
|
|
Lo += (kD * finalAlbedo / PI + specular ) * radiance * NdotL ;// note that we already multiplied the BRDF by the Fresnel (kS) so we won't multiply by kS again
|
|
}
|
|
|
|
|
|
/// ambient lighting (we now use IBL as the ambient term)
|
|
vec3 F = fresnelSchlickRoughness(max(dot(N, V), 0.0), F0, finalRoughness);
|
|
|
|
vec3 kS = F;
|
|
vec3 kD = 1.0 - kS;
|
|
kD *= 1.0 - finalMetalness;
|
|
|
|
vec3 irradiance = mix(texture(u_IrradianceMap, N).rgb, vec3(0.1f), 0.9f);
|
|
vec3 diffuse = irradiance * finalAlbedo ;
|
|
|
|
// sample both the pre-filter map and the BRDF lut and combine them together as per the Split-Sum approximation to get the IBL specular part.
|
|
const float MAX_REFLECTION_LOD = 4.0;
|
|
vec3 prefilteredColor = textureLod(prefilterMap, R, finalRoughness * MAX_REFLECTION_LOD).rgb;
|
|
vec2 brdf = texture(brdfLUT, vec2(max(dot(N, V), 0.0), finalRoughness)).rg;
|
|
vec3 specular = prefilteredColor * (F * brdf.x + brdf.y);
|
|
|
|
vec3 ambient = (kD * diffuse + specular) * finalAO;
|
|
vec3 color = ambient + Lo;
|
|
|
|
color += Fog;
|
|
// HDR tonemapping
|
|
color = color / (color + vec3(1.0));
|
|
|
|
const float gamma = 2.2;
|
|
|
|
color = vec3(1.0) - exp(-color * u_Exposure);
|
|
// gamma correct
|
|
color = pow(color, vec3(1.0 / gamma));
|
|
|
|
//ComputeVolumetric
|
|
color = mix(color, finalNormal, u_ShowNormal);
|
|
|
|
FragColor = vec4(color, 1.0); // so If i wanted to implement other stuff like SSR and bloom. I would need another render texture? using this same shader?
|
|
} |