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Differential D13043 Diff 44271 source/blender/gpu/shaders/material/gpu_shader_material_fractal_noise.glsl

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source/blender/gpu/shaders/material/gpu_shader_material_fractal_noise.glsl

/* The fractal_noise functions are all exactly the same except for the input type. */ /* The fractal_noise functions are all exactly the same except for the input type. */
float fractal_noise(float p, float octaves, float roughness) float fractal_noise(float p, float octaves, float roughness)
{ {
float fscale = 1.0; float fscale = 1.0;
float amp = 1.0; float amp = 1.0;
float maxamp = 0.0; float maxamp = 0.0;
float sum = 0.0; float sum = 0.0;
octaves = clamp(octaves, 0.0, 16.0); octaves = clamp(octaves, 0.0, 15.0);
int n = int(octaves); int n = int(octaves);
for (int i = 0; i <= n; i++) { for (int i = 0; i <= n; i++) {
float t = noise(fscale * p); float t = noise(fscale * p);
sum += t * amp; sum += t * amp;
maxamp += amp; maxamp += amp;
amp *= clamp(roughness, 0.0, 1.0); amp *= clamp(roughness, 0.0, 1.0);
fscale *= 2.0; fscale *= 2.0;
} }
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/* The fractal_noise functions are all exactly the same except for the input type. */ /* The fractal_noise functions are all exactly the same except for the input type. */
float fractal_noise(vec2 p, float octaves, float roughness) float fractal_noise(vec2 p, float octaves, float roughness)
{ {
float fscale = 1.0; float fscale = 1.0;
float amp = 1.0; float amp = 1.0;
float maxamp = 0.0; float maxamp = 0.0;
float sum = 0.0; float sum = 0.0;
octaves = clamp(octaves, 0.0, 16.0); octaves = clamp(octaves, 0.0, 15.0);
int n = int(octaves); int n = int(octaves);
for (int i = 0; i <= n; i++) { for (int i = 0; i <= n; i++) {
float t = noise(fscale * p); float t = noise(fscale * p);
sum += t * amp; sum += t * amp;
maxamp += amp; maxamp += amp;
amp *= clamp(roughness, 0.0, 1.0); amp *= clamp(roughness, 0.0, 1.0);
fscale *= 2.0; fscale *= 2.0;
} }
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/* The fractal_noise functions are all exactly the same except for the input type. */ /* The fractal_noise functions are all exactly the same except for the input type. */
float fractal_noise(vec3 p, float octaves, float roughness) float fractal_noise(vec3 p, float octaves, float roughness)
{ {
float fscale = 1.0; float fscale = 1.0;
float amp = 1.0; float amp = 1.0;
float maxamp = 0.0; float maxamp = 0.0;
float sum = 0.0; float sum = 0.0;
octaves = clamp(octaves, 0.0, 16.0); octaves = clamp(octaves, 0.0, 15.0);
int n = int(octaves); int n = int(octaves);
for (int i = 0; i <= n; i++) { for (int i = 0; i <= n; i++) {
float t = noise(fscale * p); float t = noise(fscale * p);
sum += t * amp; sum += t * amp;
maxamp += amp; maxamp += amp;
amp *= clamp(roughness, 0.0, 1.0); amp *= clamp(roughness, 0.0, 1.0);
fscale *= 2.0; fscale *= 2.0;
} }
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/* The fractal_noise functions are all exactly the same except for the input type. */ /* The fractal_noise functions are all exactly the same except for the input type. */
float fractal_noise(vec4 p, float octaves, float roughness) float fractal_noise(vec4 p, float octaves, float roughness)
{ {
float fscale = 1.0; float fscale = 1.0;
float amp = 1.0; float amp = 1.0;
float maxamp = 0.0; float maxamp = 0.0;
float sum = 0.0; float sum = 0.0;
octaves = clamp(octaves, 0.0, 16.0); octaves = clamp(octaves, 0.0, 15.0);
int n = int(octaves); int n = int(octaves);
for (int i = 0; i <= n; i++) { for (int i = 0; i <= n; i++) {
float t = noise(fscale * p); float t = noise(fscale * p);
sum += t * amp; sum += t * amp;
maxamp += amp; maxamp += amp;
amp *= clamp(roughness, 0.0, 1.0); amp *= clamp(roughness, 0.0, 1.0);
fscale *= 2.0; fscale *= 2.0;
} }
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