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155 lines
6.7 KiB
GLSL
155 lines
6.7 KiB
GLSL
#version 450 core
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#extension GL_ARB_shading_language_include : require
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#include "../../lib/lights.fs"
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#include "../../lib/material.fs"
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#include "../../lib/standarduniform.fs"
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//texture defines
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#define ATLAS_ELEMENT_DIM 256.0
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#define ATLAS_DIM 8192.0
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#define ATLAS_EL_PER_ROW 32
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#define ATLAS_NORMALIZED_ELEMENT_WIDTH 0.031 //within the single texture within the atlas, we use this so we never go over the end of the texture
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#define ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL 0.03125 //used to properly shift from texture to texture in the atlas
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/**
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* Transparency of the terrain
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*/
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#define TERRAIN_TRANSPARENCY 1.0
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in vec3 FragPos;
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in vec3 ViewFragPos;
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in vec3 Normal;
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in vec2 texPlane1;
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in vec2 texPlane2;
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in vec2 texPlane3;
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in vec4 FragPosLightSpace;
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in vec3 samplerIndexVec; //the indices in the atlas of textures to sample
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in vec3 samplerRatioVec; //the vector of HOW MUCH to pull from each texture in the atlas
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uniform dvec3 viewPos;
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// uniform DirLight dirLight;
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// uniform PointLight pointLights[NR_POINT_LIGHTS];
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// uniform SpotLight spotLight;
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uniform Material material;
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/**
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The output
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*/
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out vec4 FragColor;
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// function prototypes
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vec3 getColor(vec2 texPlane1, vec2 texPlane2, vec2 texPlane3, vec3 normal, vec3 samplerIndexVec, vec3 samplerRatioVec, Material material);
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void main(){
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vec3 norm = normalize(Normal);
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vec3 viewDir = normalize(vec3(viewPos) - FragPos);
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//get color of base texture
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vec3 albedo = getColor(texPlane1, texPlane2, texPlane3, norm, samplerIndexVec, samplerRatioVec, material);
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// Calculate the light to apply
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vec3 light = getTotalLight(
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material,
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albedo,
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vec3(viewPos.xyz),
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FragPosLightSpace,
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ViewFragPos,
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FragPos,
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norm,
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viewDir
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);
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//calculate final color
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vec3 finalColor = light;
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//this final calculation is for transparency
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FragColor = vec4(finalColor, TERRAIN_TRANSPARENCY);
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}
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/**
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* The function that gets the texture color based on the triplanar texture mapping and the voxel type at each point along the vert.
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* See the triplanar mapping wiki article for an explanation of math involved.
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*/
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vec3 getColor(vec2 texPlane1, vec2 texPlane2, vec2 texPlane3, vec3 normal, vec3 samplerIndexVec, vec3 samplerRatioVec, Material material){
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vec3 weights = abs(normal);
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//what is the index in the atlas of the texture for a given vertex
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int vert1AtlasIndex = int(samplerIndexVec.x);
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int vert2AtlasIndex = int(samplerIndexVec.y);
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int vert3AtlasIndex = int(samplerIndexVec.z);
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//what is the weight of that texture relative to the fragment
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float vert1Weight = samplerRatioVec.x;
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float vert2Weight = samplerRatioVec.y;
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float vert3Weight = samplerRatioVec.z;
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//the x-wise uv of the texture for vert1
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vec2 vert1_x_uv = vec2(
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(fract(texPlane1.x) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (mod(samplerIndexVec.x,ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL),
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(fract(texPlane1.y) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (round(samplerIndexVec.x / ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL)
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);
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//the x-wise uv of the texture for vert2
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vec2 vert2_x_uv = vec2(
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(fract(texPlane1.x) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (mod(samplerIndexVec.y,ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL),
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(fract(texPlane1.y) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (round(samplerIndexVec.y / ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL)
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);
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//the x-wise uv of the texture for vert3
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vec2 vert3_x_uv = vec2(
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(fract(texPlane1.x) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (mod(samplerIndexVec.z,ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL),
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(fract(texPlane1.y) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (round(samplerIndexVec.z / ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL)
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);
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//albedo for the X texture
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vec3 albedoX = texture(material.diffuse, vert1_x_uv).rgb * vert1Weight + texture(material.diffuse, vert2_x_uv).rgb * vert2Weight + texture(material.diffuse, vert3_x_uv).rgb * vert3Weight;
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//the y-wise uv of the texture for vert1
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vec2 vert1_y_uv = vec2(
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(fract(texPlane2.x) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (mod(samplerIndexVec.x,ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL),
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(fract(texPlane2.y) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (round(samplerIndexVec.x / ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL)
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);
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//the y-wise uv of the texture for vert2
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vec2 vert2_y_uv = vec2(
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(fract(texPlane2.x) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (mod(samplerIndexVec.y,ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL),
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(fract(texPlane2.y) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (round(samplerIndexVec.y / ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL)
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);
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//the y-wise uv of the texture for vert3
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vec2 vert3_y_uv = vec2(
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(fract(texPlane2.x) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (mod(samplerIndexVec.z,ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL),
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(fract(texPlane2.y) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (round(samplerIndexVec.z / ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL)
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);
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//albedo for the X texture
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vec3 albedoY = texture(material.diffuse, vert1_y_uv).rgb * vert1Weight + texture(material.diffuse, vert2_y_uv).rgb * vert2Weight + texture(material.diffuse, vert3_y_uv).rgb * vert3Weight;
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//the z-wise uv of the texture for vert1
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vec2 vert1_z_uv = vec2(
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(fract(texPlane3.x) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (mod(samplerIndexVec.x,ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL),
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(fract(texPlane3.y) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (round(samplerIndexVec.x / ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL)
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);
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//the z-wise uv of the texture for vert2
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vec2 vert2_z_uv = vec2(
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(fract(texPlane3.x) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (mod(samplerIndexVec.y,ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL),
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(fract(texPlane3.y) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (round(samplerIndexVec.y / ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL)
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);
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//the z-wise uv of the texture for vert3
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vec2 vert3_z_uv = vec2(
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(fract(texPlane3.x) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (mod(samplerIndexVec.z,ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL),
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(fract(texPlane3.y) * ATLAS_NORMALIZED_ELEMENT_WIDTH) + (round(samplerIndexVec.z / ATLAS_EL_PER_ROW) * ATLAS_NORMALIZED_ELEMENT_WIDTH_FULL)
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);
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//albedo for the X texture
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vec3 albedoZ = texture(material.diffuse, vert1_z_uv).rgb * vert1Weight + texture(material.diffuse, vert2_z_uv).rgb * vert2Weight + texture(material.diffuse, vert3_z_uv).rgb * vert3Weight;
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return (albedoX * weights.x + albedoY * weights.y + albedoZ * weights.z);
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}
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