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Code Issues 147 Wiki Activity

Make the material shaders physically based

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Hirek
2026-10-20 18:39:31 +02:00
parent cf36b24e8d
commit 7d0f76aaa9
20 changed files with 288 additions and 258 deletions
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18
shaders/mat_parallax.frag
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@@ -55,7 +55,8 @@ void main()
normal.z = sqrt(1.0 - clamp((dot(normal.xy, normal.xy)), 0.0, 1.0));
vec3 fragnormal = normalize(f_tbn * normalize(normal.xyz));
float reflectivity = param[1].z * texture(normalmap, f_coord_p).a;
float specularity = (tex_color.r + tex_color.g + tex_color.b) * 0.5;
float specularity = (tex_color.r + tex_color.g + tex_color.b) * 0.5;
legacy_gloss();
fragcolor = apply_lights(fragcolor, fragnormal, tex_color.rgb, reflectivity, specularity, shadow_tone);
@@ -78,36 +79,41 @@ void main()
vec2 ParallaxMapping(vec2 f_coord, vec3 viewDir)
{
float pos_len = length(f_pos.xyz);
// gradients of the coordinates taken here: inside the loop the fragments of a quad don't go the same way
vec2 dcoorddx = dFdx(f_coord);
vec2 dcoorddy = dFdy(f_coord);
if (pos_len > 100.0) {
return f_coord;
}
// the shift fades out before the distance it stops at, so it doesn't switch off at once there
float fade = 1.0 - smoothstep(80.0, 100.0, pos_len);
#if EXTRAEFFECTS_ENABLED
const float minLayers = 8.0;
const float maxLayers = 32.0;
float LayersWeight = pos_len / 20.0;
vec2 currentTexCoords = f_coord;
float currentDepthMapValue = texture(normalmap, currentTexCoords).b;
float currentDepthMapValue = textureGrad(normalmap, currentTexCoords, dcoorddx, dcoorddy).b;
LayersWeight = min(abs(dot(vec3(0.0, 0.0, 1.0), viewDir)),LayersWeight);
float numLayers = mix(maxLayers, minLayers, clamp(LayersWeight, 0.0, 1.0)); // number of depth layers
float layerDepth = 1.0 / numLayers; // calculate the size of each layer
float currentLayerDepth = 0.0; // depth of current layer
vec2 P = viewDir.xy * param[2].y; // the amount to shift the texture coordinates per layer (from vector P)
vec2 P = viewDir.xy * param[2].y * fade; // the amount to shift the texture coordinates per layer (from vector P)
vec2 deltaTexCoords = P / numLayers;
while(currentLayerDepth < currentDepthMapValue)
{
currentTexCoords -= deltaTexCoords; // shift texture coordinates along direction of P
currentDepthMapValue = texture(normalmap, currentTexCoords).b; // get depthmap value at current texture coordinates
currentDepthMapValue = textureGrad(normalmap, currentTexCoords, dcoorddx, dcoorddy).b; // get depthmap value at current texture coordinates
currentLayerDepth += layerDepth; // get depth of next layer
}
vec2 prevTexCoords = currentTexCoords + deltaTexCoords; // get texture coordinates before collision (reverse operations)
float afterDepth = currentDepthMapValue - currentLayerDepth; // get depth after and before collision for linear interpolation
float beforeDepth = texture(normalmap, prevTexCoords).b - currentLayerDepth + layerDepth;
float beforeDepth = textureGrad(normalmap, prevTexCoords, dcoorddx, dcoorddy).b - currentLayerDepth + layerDepth;
float weight = afterDepth / (afterDepth - beforeDepth); // interpolation of texture coordinates
vec2 finalTexCoords = prevTexCoords * weight + currentTexCoords * (1.0 - weight);
@@ -115,7 +121,7 @@ vec2 ParallaxMapping(vec2 f_coord, vec3 viewDir)
return finalTexCoords;
#else
float height = texture(normalmap, f_coord).b;
vec2 p = viewDir.xy / viewDir.z * (height * (param[2].y - param[2].z) * 0.2);
vec2 p = viewDir.xy / viewDir.z * (height * (param[2].y - param[2].z) * 0.2) * fade;
return f_coord - p;
#endif
}