229 lines
6.9 KiB
GLSL
229 lines
6.9 KiB
GLSL
#version 400 core
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#define NR_POINT_LIGHTS 10
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layout (location = 0) out vec4 accum;
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layout (location = 1) out float reveal;
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layout (std140) uniform Lights {
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// this is how many because we have to align
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// bytes it SHOULD in multiples of 16, this
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// take it where it ACTUALLY is
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//
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//refer: https://learnopengl.com/Advanced-OpenGL/Advanced-GLSL
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//
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// base alignment aligned offset
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//direct light
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vec3 dLDirection; // 16 0
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vec3 dLAmbient; // 16 16
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vec3 dLDiffuse; // 16 32
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vec3 dLSpecular; // 16 48
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//point light
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vec3 pLposition[NR_POINT_LIGHTS]; // 16*10 64
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float pLconstant[NR_POINT_LIGHTS]; // 16*10 224
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float pLlinear[NR_POINT_LIGHTS]; // 16*10 384
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float pLquadratic[NR_POINT_LIGHTS]; // 16*10 544
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vec3 pLambient[NR_POINT_LIGHTS]; // 16*10 704
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vec3 pLdiffuse[NR_POINT_LIGHTS]; // 16*10 864
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vec3 pLspecular[NR_POINT_LIGHTS]; // 16*10 1024
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//for a total size of 1184
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};
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struct Material {
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sampler2D diffuse;
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sampler2D specular;
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float shininess;
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};
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//inputs
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in vec3 FragPos;
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in vec3 Normal;
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in vec2 TexCoord;
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in vec4 FragPosLightSpace;
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//view position
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uniform vec3 viewPos;
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//material
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uniform Material material;
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//light depth map
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uniform sampler2D shadowMap;
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//function prototypes
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float calcLightIntensityTotal(vec3 normal);
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float ShadowCalculation(vec4 fragPosLightSpace, vec3 lightDir, vec3 normal);
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float linearizeDepth(float d,float zNear,float zFar);
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float weightCalcOrigin(float finalAlpha, float zLoc, float linearizedLoc);
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float weightCalcFlat(float finalAlpha, float zLoc, float linearizedLoc);
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float weightCalcNew(float finalAlpha, float zLoc, float linearizedLoc);
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void main(){
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vec3 norm = normalize(Normal);
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vec3 viewDir = normalize(viewPos - FragPos);
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//grab light intensity
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float lightIntensity = calcLightIntensityTotal(norm);
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//get color of base texture
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vec4 textureColor = texture(material.diffuse, TexCoord);
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vec3 textureRGB = textureColor.rgb;
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//shadow
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float shadow = ShadowCalculation(FragPosLightSpace, normalize(-dLDirection), norm);
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vec3 shadowModifiedColor = textureRGB * lightIntensity * max(shadow, 0.4);
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//calculate final color
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vec4 finalColor = vec4(shadowModifiedColor,textureColor.a);
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//calculate weight function
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float weight = clamp(pow(min(1.0, finalColor.a * 10.0) + 0.01, 3.0) * 1e8 *
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pow(1.0 - gl_FragCoord.z * 0.9, 3.0), 1e-2, 3e3);
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//emit colors
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accum = vec4(finalColor.rgb * finalColor.a, finalColor.a) * weight;
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reveal = finalColor.a;
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}
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//a weight calculation
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float weightCalcOrigin(float finalAlpha, float zLoc, float linearizedLoc){
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float weight = clamp(pow(min(1.0, finalAlpha * 10.0) + 0.01, 3.0) * 1e8 *
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pow(1.0 - zLoc * 0.9, 3.0), 1e-2, 3e3);
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return weight;
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}
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//a weight calculation
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float weightCalcFlat(float finalAlpha, float zLoc, float linearizedLoc){
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return 0.1f;
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}
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//a weight calculation
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float weightCalcNew(float finalAlpha, float zLoc, float linearizedLoc){
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float alphaComponent = pow(min(1.0, finalAlpha * 10.0) + 0.01, 3.0);
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float zComponent = pow(1.0 - zLoc * 0.9, 3.0);
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float weightRaw = alphaComponent * 1e8 * zComponent;
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float weight = clamp(weightRaw, 1e-2, 3e3);
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return weight;
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}
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//Linearizes the depth
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float linearizeDepth(float d,float zNear,float zFar){
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return zNear * zFar / (zFar + d * (zNear - zFar));
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}
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float calcLightIntensityAmbient(){
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//calculate average of ambient light
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float avg = (dLAmbient.x + dLAmbient.y + dLAmbient.z)/3.0;
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return avg;
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}
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//
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float calcLightIntensityDir(vec3 normal){
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vec3 lightDir = normalize(-dLDirection);
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// diffuse shading
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float diff = max(dot(normal, lightDir), 0.0);
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return diff;
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}
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//
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float calcLightIntensityTotal(vec3 normal){
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//ambient intensity
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float ambientLightIntensity = calcLightIntensityAmbient();
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//get direct intensity
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float directLightIntensity = calcLightIntensityDir(normal);
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//sum
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float total = ambientLightIntensity + directLightIntensity;
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return total;
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}
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//
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vec3 getTotalLightColor(vec3 normal){
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//get the direct light color adjusted for intensity
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vec3 diffuseLightColor = dLDiffuse * calcLightIntensityDir(normal);
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//sum light colors
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vec3 totalLightColor = diffuseLightColor;
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return totalLightColor;
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}
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vec3 CalcPointLight(int i, vec3 normal, vec3 fragPos, vec3 viewDir){
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vec3 lightDir = normalize(pLposition[i] - fragPos);
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// diffuse shading
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float diff = max(dot(normal, lightDir), 0.0);
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// specular shading
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// vec3 reflectDir = reflect(-lightDir, normal);
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// float spec = pow(max(dot(viewDir, reflectDir), 0.0), material.shininess);
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// attenuation
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float distance = length(pLposition[i] - fragPos);
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float attenuation = 1.0 / (pLconstant[i] + pLlinear[i] * distance + pLquadratic[i] * (distance * distance));
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// combine results
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vec3 ambient = pLambient[i];// * vec4(texture(material.diffuse, TexCoord)).xyz;
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vec3 diffuse = pLdiffuse[i] * diff;// * vec4(texture(material.diffuse, TexCoord)).xyz;
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// vec3 specular = pLspecular[i] * spec;// * vec4(texture(material.specular, TexCoord)).xyz;
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ambient *= attenuation;
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diffuse *= attenuation;
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// specular *= attenuation;
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vec3 specular = vec3(0,0,0);
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vec3 finalValue = (ambient + diffuse + specular);
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finalValue = vec3(max(finalValue.x,0),max(finalValue.y,0),max(finalValue.z,0));
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return finalValue;
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}
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float ShadowCalculation(vec4 fragPosLightSpace, vec3 lightDir, vec3 normal){
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// perform perspective divide
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vec3 projCoords = fragPosLightSpace.xyz / fragPosLightSpace.w;
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//transform to NDC
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projCoords = projCoords * 0.5 + 0.5;
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//get closest depth from light's POV
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float closestDepth = texture(shadowMap, projCoords.xy).r;
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//get depth of current fragment
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float currentDepth = projCoords.z;
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//calculate bias
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float bias = max(0.05 * (1.0 - dot(normal, lightDir)), 0.005);
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//calculate shadow value
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float shadow = currentDepth - bias > closestDepth ? 1.0 : 0.0;
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if(projCoords.z > 1.0){
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shadow = 0.0;
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}
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//calculate dot product, if it is >0 we know they're parallel-ish therefore should disregard the shadow mapping
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//ie the fragment is already facing away from the light source
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float dotprod = dot(normalize(lightDir),normalize(normal));
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if(dotprod > 0.0){
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shadow = 0.0;
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}
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// shadow = currentDepth;
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return shadow;
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} |