Add more utilities to default shader function + make the road shader more optimized

data/shaders/sp_normal_map.frag

@@ -4,6 +4,7 @@ in float hue_change;
 in vec3 normal;
 in vec3 tangent;
 in vec2 uv;
+in vec4 world_position;
 
 layout(location = 0) out vec4 o_diffuse_color;
 layout(location = 1) out vec4 o_normal_color;
@@ -12,9 +13,17 @@ layout(location = 1) out vec4 o_normal_color;
 #stk_include "utils/rgb_conversion.frag"
 #stk_include "utils/sp_texture_sampling.frag"
 
+uniform sampler2D g_detail_map;
+
 void main()
 {
+    // Triplanar detail map
+    vec2 xyuv = vec2(world_position.x, world_position.y);
+    float detail = texture(g_detail_map, uv * 32).r;
+    detail *= 2.5;
+
     vec4 col = sampleTextureLayer0(uv);
+    col = (col - detail) + 0.5;
     if (hue_change > 0.0)
     {
         float mask = col.a;

data/shaders/sp_road_blending.frag

@@ -1,3 +1,5 @@
+uniform sampler2D road_masking;
+
 in vec3 bitangent;
 in vec4 color;
 in float hue_change;
@@ -21,6 +23,7 @@ void main()
     vec4 col = multi_sampleTextureLayer0(uv, camdist);
 
     float mask = sampleTextureLayer4(uuv * 2.0).r;
+    mask += sampleTextureLayer4(uuv * 0.5).r;
 
     //* (1.0 - color.g)
     mask = mix(1.0, mask, color.r);
@@ -36,16 +39,16 @@ void main()
     mask_2 = pow(mask_2, 1.5);
     mask_2 *= pow(mask_3, 0.5);
 
-    float skidding_marks = sampleTextureLayer5(uv * 10.0).g;
+    float skidding_marks = texture(road_masking, uv * 10.0).g;
     skidding_marks *= mask_2;
     col = mix(col, vec4(0.0, 0.0, 0.0, 1.0), skidding_marks);
 
-    float skidding_marks_2 = sampleTextureLayer5(uv * 15.0).g;
+    float skidding_marks_2 = texture(road_masking, uv * 15.0).g;
     skidding_marks_2 *= mask_2;
     col = mix(col, vec4(0.0, 0.0, 0.0, 1.0), skidding_marks_2);
 
     // Add some cracks
-    float cracks_marks = sampleTextureLayer5(uv * 11.0).b;
+    float cracks_marks = texture(road_masking, uv * 11.0).b;
     float crack_mask = sampleTextureLayer4(uuv * 0.5).r;
     cracks_marks *= crack_mask;
     col = mix(col, vec4(0.0, 0.0, 0.0, 1.0), cracks_marks);

data/shaders/sps_01_normalmap.xml

@@ -3,6 +3,10 @@
     <first-pass vertex-shader="sp_pass.vert"
         fragment-shader="sp_normal_map.frag"
         skinned-mesh-shader="sp_skinning.vert">
+    <prefilled-textures>
+            <prefilled-texture name="g_detail_map" file="gfx_detailmap_a.png"
+                 srgb="Y" sampler="trilinear"/>
+    </prefilled-textures>
     </first-pass>
     <shadow-pass vertex-shader="sp_shadow.vert"
         fragment-shader="white.frag"

data/shaders/sps_12_roadBlending.xml

@@ -2,15 +2,8 @@
     <shader-info name="roadBlending" fallback-shader="solid" use-tangents="Y"/>
     <first-pass vertex-shader="sp_pass.vert"
         fragment-shader="sp_road_blending.frag">
+        <prefilled-textures>
+            <prefilled-texture name="road_masking" file="hd_roadMarking_a_mask.png" srgb="Y" sampler="trilinear"/>
+        </prefilled-textures>
     </first-pass>
-    <!--
-    <shadow-pass vertex-shader="sp_shadow.vert"
-        fragment-shader="white.frag"
-        skinned-mesh-shader="sp_skinning_shadow.vert">
-    </shadow-pass>
-    <uniform-assigners>
-        <uniform-assigner name="layer"
-        function="shadowCascadeUniformAssigner"/>
-    </uniform-assigners>
-    -->
 </spshader>

data/shaders/utils/sp_texture_sampling.frag

@@ -109,6 +109,29 @@ vec4 sampleTextureLayer4(vec2 uv)
     return texture(tex_layer_4, uv);
 }
 
+vec4 multi_sampleTextureLayer4(vec2 uv, float distance)
+{
+
+    vec4 l_col = sampleTextureLayer4(uv * LOW_SAMPLING);
+    vec4 m_col = sampleTextureLayer4(uv * MEDIUM_SAMPLING);
+    vec4 h_col = sampleTextureLayer4(uv * HIGH_SAMPLING);
+
+    // From Low to medium
+    float factor = distance * 0.02;
+    factor = pow(factor, 2.5);
+    factor = clamp(factor, 0.0, 1.0);
+    vec4 f_col = mix(m_col, l_col, factor);
+    
+    // From medium to high
+    factor = distance * 0.1;
+    factor = pow(factor, 2.5);
+    factor = clamp(factor, 0.0, 1.0);
+
+    f_col = mix(h_col, f_col, factor);
+
+    return f_col;
+}
+
 vec4 sampleTextureLayer5(vec2 uv)
 {
     return texture(tex_layer_5, uv);