t3du - Add Brick Texture

leenkx/blender/lnx/material/cycles_functions.py

@@ -298,6 +298,125 @@ float tex_brick_f(vec3 p) {
 }
 """
 
+
+
+#https://github.com/blender/blender/blob/main/source/blender/gpu/shaders/material/gpu_shader_material_tex_brick.glsl
+str_tex_brick_blender = """
+float integer_noise(int n)
+{
+  /* Integer bit-shifts for these calculations can cause precision problems on macOS.
+   * Using uint resolves these issues. */
+  uint nn;
+  nn = (uint(n) + 1013u) & 0x7fffffffu;
+  nn = (nn >> 13u) ^ nn;
+  nn = (uint(nn * (nn * nn * 60493u + 19990303u)) + 1376312589u) & 0x7fffffffu;
+  return 0.5f * (float(nn) / 1073741824.0f);
+}
+vec2 calc_brick_texture(vec3 p,
+                          float mortar_size,
+                          float mortar_smooth,
+                          float bias,
+                          float brick_width,
+                          float row_height,
+                          float offset_amount,
+                          int offset_frequency,
+                          float squash_amount,
+                          int squash_frequency)
+{
+  int bricknum, rownum;
+  float offset = 0.0f;
+  float x, y;
+  rownum = int(floor(p.y / row_height));
+  if (offset_frequency != 0 && squash_frequency != 0) {
+    brick_width *= (rownum % squash_frequency != 0) ? 1.0f : squash_amount;           /* squash */
+    offset = (rownum % offset_frequency != 0) ? 0.0f : (brick_width * offset_amount); /* offset */
+  }
+  bricknum = int(floor((p.x + offset) / brick_width));
+  x = (p.x + offset) - brick_width * bricknum;
+  y = p.y - row_height * rownum;
+  float tint = clamp((integer_noise((rownum << 16) + (bricknum & 0xFFFF)) + bias), 0.0f, 1.0f);
+  float min_dist = min(min(x, y), min(brick_width - x, row_height - y));
+  if (min_dist >= mortar_size) {
+    return vec2(tint, 0.0f);
+  }
+  else if (mortar_smooth == 0.0f) {
+    return vec2(tint, 1.0f);
+  }
+  else {
+    min_dist = 1.0f - min_dist / mortar_size;
+    return vec2(tint, smoothstep(0.0f, mortar_smooth, min_dist));
+  }
+}
+vec3 tex_brick_blender(vec3 co,
+                    vec3 color1,
+                    vec3 color2,
+                    vec3 mortar,
+                    float scale,
+                    float mortar_size,
+                    float mortar_smooth,
+                    float bias,
+                    float brick_width,
+                    float row_height,
+                    float offset_amount,
+                    float offset_frequency,
+                    float squash_amount,
+                    float squash_frequency)
+{
+  vec2 f2 = calc_brick_texture(co * scale,
+                                 mortar_size,
+                                 mortar_smooth,
+                                 bias,
+                                 brick_width,
+                                 row_height,
+                                 offset_amount,
+                                 int(offset_frequency),
+                                 squash_amount,
+                                 int(squash_frequency));
+  float tint = f2.x;
+  float f = f2.y;
+  if (f != 1.0f) {
+    float facm = 1.0f - tint;
+    color1 = facm * color1 + tint * color2;
+  }
+    return mix(color1, mortar, f);
+}
+float tex_brick_blender_f(vec3 co,
+                    vec3 color1,
+                    vec3 color2,
+                    vec3 mortar,
+                    float scale,
+                    float mortar_size,
+                    float mortar_smooth,
+                    float bias,
+                    float brick_width,
+                    float row_height,
+                    float offset_amount,
+                    float offset_frequency,
+                    float squash_amount,
+                    float squash_frequency)
+{
+  vec2 f2 = calc_brick_texture(co * scale,
+                                 mortar_size,
+                                 mortar_smooth,
+                                 bias,
+                                 brick_width,
+                                 row_height,
+                                 offset_amount,
+                                 int(offset_frequency),
+                                 squash_amount,
+                                 int(squash_frequency));
+  float tint = f2.x;
+  float f = f2.y;
+  if (f != 1.0f) {
+    float facm = 1.0f - tint;
+    color1 = facm * color1 + tint * color2;
+  }
+    return f;
+}
+"""
+
+
+
 str_tex_wave = """
 float tex_wave_f(const vec3 p, const int type, const int profile, const float dist, const float detail, const float detail_scale) {
     float n;