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[examples] Fixed shaders_mandelbrot_set for WebGL (#5286)

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JordSant
2025-10-20 15:18:15 +02:00
committed by GitHub
parent 5aeedb4899
commit 8604085b6e
2 changed files with 23 additions and 17 deletions
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35
examples/shaders/resources/shaders/glsl100/mandelbrot_set.fs
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@ -17,6 +17,9 @@ uniform int maxIterations; // Max iterations per pixel
const float max = 4.0; // We consider infinite as 4.0: if a point reaches a distance of 4.0 it will escape to infinity
const float max2 = max*max; // Square of max to avoid computing square root
// WebGL shaders for loop iteration limit only const
const int maxIterationsLimit = 20000;
void main()
{
// The pixel coordinates are scaled so they are on the mandelbrot scale
@ -31,31 +34,29 @@ void main()
// Fc(z) = z^2 + c on the complex numbers c from the plane does not diverge to infinity starting at z = 0
// Here: z = a + bi. Iterations: z -> z^2 + c = (a + bi)^2 + (c.x + c.yi) = (a^2 - b^2 + c.x) + (2ab + c.y)i
int iter = 0;
while (iter < maxIterations)
for (int iter = 0; iter < maxIterationsLimit; ++iter)
{
float aa = a*a;
float bb = b*b;
if (iter >= maxIterations)
{
gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);
return;
}
if (aa + bb > max2)
break;
{
float normR = float(iter - (iter/55)*55)/55.0;
float normG = float(iter - (iter/69)*69)/69.0;
float normB = float(iter - (iter/40)*40)/40.0;
gl_FragColor = vec4(sin(normR*PI), sin(normG*PI), sin(normB*PI), 1.0);
return;
}
float twoab = 2.0*a*b;
a = aa - bb + c.x;
b = twoab + c.y;
++iter;
}
if (iter >= maxIterations)
{
gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);
}
else
{
float normR = float(iter - (iter/55)*55)/55.0;
float normG = float(iter - (iter/69)*69)/69.0;
float normB = float(iter - (iter/40)*40)/40.0;
gl_FragColor = vec4(sin(normR*PI), sin(normG*PI), sin(normB*PI), 1.0);
}
gl_FragColor = vec4(0.0, 0.0, 0.0, 1.0);
}