twix/raylib
1
0
Fork 0
mirror of https://github.com/raysan5/raylib.git synced 2026-02-02 04:09:18 -05:00
Code Issues Packages Projects Releases Wiki Activity

Review some shaders to work on GLSL 100

Browse Source 
Tested on Raspberry Pi... Just note that platform is very limited by GPU...
This commit is contained in:
raysan5
2019-12-04 19:52:53 +01:00
parent ff499fe57d
commit 3aad221b1e
4 changed files with 40 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

15
examples/shaders/resources/shaders/glsl100/julia_set.fs
View File

@ -11,7 +11,9 @@ uniform vec2 c; // c.x = real, c.y = imaginary component. Equati
uniform vec2 offset; // Offset of the scale.
uniform float zoom; // Zoom of the scale.
const int MAX_ITERATIONS = 255; // Max iterations to do.
// NOTE: Maximum number of shader for-loop iterations depend on GPU,
// for example, on RasperryPi for this examply only supports up to 60
const int MAX_ITERATIONS = 48; // Max iterations to do
// Square a complex number
vec2 ComplexSquare(vec2 z)
@ -56,21 +58,22 @@ void main()
// NOTE: fragTexCoord already comes as normalized screen coordinates but offset must be normalized before scaling and zoom
vec2 z = vec2((fragTexCoord.x + offset.x/screenDims.x)*2.5/zoom, (fragTexCoord.y + offset.y/screenDims.y)*1.5/zoom);
int iterations = 0;
for (iterations = 0; iterations < MAX_ITERATIONS; iterations++)
int iter = 0;
for (int iterations = 0; iterations < 60; iterations++)
{
z = ComplexSquare(z) + c; // Iterate function
if (dot(z, z) > 4.0) break;
iter = iterations;
}
// Another few iterations decreases errors in the smoothing calculation.
// See http://linas.org/art-gallery/escape/escape.html for more information.
z = ComplexSquare(z) + c;
z = ComplexSquare(z) + c;
// This last part smooths the color (again see link above).
float smoothVal = float(iterations) + 1.0 - (log(log(length(z)))/log(2.0));
float smoothVal = float(iter) + 1.0 - (log(log(length(z)))/log(2.0));
// Normalize the value so it is between 0 and 1.
float norm = smoothVal/float(MAX_ITERATIONS);