169 lines
4.9 KiB
GLSL
169 lines
4.9 KiB
GLSL
#version 330 core
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layout(location = 0) out vec4 f_color;
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in vec3 v_normal;
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in vec2 v_texCoord;
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in vec3 v_fragmentPosition;
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struct Material {
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sampler2D texture_diffuse0;
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sampler2D texture_diffuse1;
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sampler2D texture_specular0;
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sampler2D texture_specular1;
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float shininess;
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};
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uniform Material u_material;
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struct DirectionalLight {
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vec3 direction;
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vec3 ambient;
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vec3 diffuse;
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vec3 specular;
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};
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uniform DirectionalLight u_directionalLight;
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struct PointLight {
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vec3 position;
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float K_c;
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float K_l;
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float K_q;
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vec3 ambient;
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vec3 diffuse;
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vec3 specular;
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};
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#define NR_POINT_LIGHTS 1
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uniform PointLight u_pointLight[NR_POINT_LIGHTS];
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struct SpotLight {
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vec3 position;
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vec3 direction;
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float innerCutOff;
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float outerCutOff;
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float K_c;
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float K_l;
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float K_q;
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vec3 ambient;
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vec3 diffuse;
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vec3 specular;
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};
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uniform SpotLight u_spotLight;
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uniform mat3 u_normalMatrix;
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uniform vec3 u_viewPosition;
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vec3 directionalLightContribution(DirectionalLight light, vec3 normal, vec3 viewDir);
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vec3 pointLightContribution(PointLight light, vec3 normal, vec3 fragPos, vec3 viewDir);
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vec3 spotLightContribution(PointLight light, vec3 normal, vec3 fragPos, vec3 viewDir);
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void main() {
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vec3 fragmentColor = vec3(0.0f);
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vec3 normal = normalize(v_normal);
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vec3 viewDir = normalize(u_viewPosition - v_fragmentPosition);
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fragmentColor += directionalLightContribution(u_directionalLight, normal, viewDir);
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for(int i = 0; i < NR_POINT_LIGHTS; i++) {
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fragmentColor += pointLightContribution(u_pointLight[i], normal, v_fragmentPosition, viewDir);
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}
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//fragmentColor += spotLightContribution(u_spotLight, normal, v_fragmentPosition, viewDir);
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f_color = vec4(fragmentColor, 1.0f);
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}
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vec3 directionalLightContribution(DirectionalLight light, vec3 normal, vec3 viewDir) {
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vec3 lightDir = normalize(-light.direction);
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// Diffuse shading
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float diffuseShading = max(dot(normal, lightDir), 0.0f);
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// Specular shading
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vec3 reflectDir = reflect(-lightDir, normal);
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float specularShading = pow(max(dot(viewDir, reflectDir), 0.0f), u_material.shininess);
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vec3 diffuseTex = vec3(texture(u_material.texture_diffuse0, v_texCoord));
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vec3 specularTex = vec3(texture(u_material.texture_specular0, v_texCoord));
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vec3 ambient = light.ambient * diffuseTex;
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vec3 diffuse = light.diffuse * diffuseShading * diffuseTex;
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vec3 specular = light.specular * specularShading * specularTex;
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return (ambient + diffuse + specular);
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}
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vec3 pointLightContribution(PointLight light, vec3 normal, vec3 fragPos, vec3 viewDir) {
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vec3 lightDir = normalize(light.position - fragPos);
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// Diffuse shading
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float diffuseShading = max(dot(normal, lightDir), 0.0f);
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// Specular shading
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vec3 reflectDir = reflect(-lightDir, normal);
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float specularShading = pow(max(dot(viewDir, reflectDir), 0.0f), u_material.shininess);
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// Attenuation
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float distanceLightFragment = length(light.position - fragPos);
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float attenuation = 1.0f / (light.K_c + light.K_l * distanceLightFragment + light.K_q * distanceLightFragment * distanceLightFragment);
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vec3 diffuseTex = vec3(texture(u_material.texture_diffuse0, v_texCoord));
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vec3 specularTex = vec3(texture(u_material.texture_specular0, v_texCoord));
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vec3 ambient = light.ambient * diffuseTex;
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vec3 diffuse = light.diffuse * diffuseShading * diffuseTex;
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vec3 specular = light.specular * specularShading * specularTex;
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ambient *= attenuation;
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diffuse *= attenuation;
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specular *= attenuation;
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return (ambient + diffuse + specular);
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}
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vec3 spotLightContribution(SpotLight light, vec3 normal, vec3 fragPos, vec3 viewDir) {
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vec3 lightDir = normalize(light.position - fragPos);
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// Diffuse shading
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float diffuseShading = max(dot(normal, lightDir), 0.0f);
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// Specular shading
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vec3 reflectDir = reflect(-lightDir, normal);
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float specularShading = pow(max(dot(viewDir, reflectDir), 0.0f), u_material.shininess);
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// Attenuation
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float distanceLightFragment = length(light.position - fragPos);
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float attenuation = 1.0f / (light.K_c + light.K_l * distanceLightFragment + light.K_q * distanceLightFragment * distanceLightFragment);
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float theta = dot(lightDir, normalize(-light.direction));
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float epsilon = light.innerCutOff - light.outerCutOff;
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float intensity = clamp((theta - light.outerCutOff) / epsilon, 0.0f, 1.0f);
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vec3 diffuseTex = vec3(texture(u_material.texture_diffuse0, v_texCoord));
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vec3 specularTex = vec3(texture(u_material.texture_specular0, v_texCoord));
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vec3 ambient = light.ambient * diffuseTex;
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vec3 diffuse = light.diffuse * diffuseShading * diffuseTex;
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vec3 specular = light.specular * specularShading * specularTex;
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diffuse *= intensity;
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specular *= intensity;
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ambient *= attenuation;
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diffuse *= attenuation;
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specular *= attenuation;
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return (ambient + diffuse + specular);
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}
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