72 lines
2.1 KiB
GLSL
72 lines
2.1 KiB
GLSL
#version 330 core
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out vec4 FragColor;
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in vec3 FragPos;
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in vec3 Normal;
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in vec2 TexCoords;
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in vec4 FragPosLightSpace;
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uniform vec3 lightPos;
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uniform vec3 viewPos;
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uniform sampler2D shadowMap;
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uniform sampler2D texture_diffuse1;
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uniform sampler2D texture_specular1;
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float ShadowCalculation(vec4 fragPosLightSpace, float bias)
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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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// avoid the frustrum
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if(projCoords.z > 1.0) return 0.0;
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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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// PCF
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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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for(int y = -1; y <= 1; ++y) {
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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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return shadow / 9.0;
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}
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void main()
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{
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vec3 color = texture(texture_diffuse1, TexCoords).rgb;
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vec3 normal = normalize(Normal);
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vec3 lightColor = vec3(0.7);
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// ambient
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vec3 ambient = 0.3 * lightColor;
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// diffuse
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vec3 lightDir = normalize(lightPos - FragPos);
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float diff = max(dot(lightDir, normal), 0.0);
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vec3 diffuse = diff * lightColor;
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// specular
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vec3 viewDir = normalize(viewPos - FragPos);
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vec3 reflectDir = reflect(-lightDir, normal);
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float spec = 0.0;
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vec3 halfwayDir = normalize(lightDir + viewDir);
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spec = pow(max(dot(normal, halfwayDir), 0.0), 64.0);
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vec3 specular = spec * lightColor;
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// calculate shadow
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float bias = max(0.05 * (1.0 - dot(normal, lightDir)), 0.005);
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float shadow = ShadowCalculation(FragPosLightSpace, bias);
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vec3 lighting = (ambient + (1.0 - shadow) * (diffuse + specular)) * color;
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FragColor = vec4(lighting, 1.0);
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}
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