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#version 330
#define PI 3.1415926538
// Input vertex attributes (from vertex shader)
in vec2 fragTexCoord;
in vec4 fragColor;
// Input uniform values
uniform sampler2D texture0;
uniform vec4 colDiffuse;
// Output fragment color
out vec4 finalColor;
// Imported variables from code
uniform float renderWidth;
uniform float renderHeight;
uniform float stretch_amount;
// Variable set up
vec2 flipped = vec2(fragTexCoord.x, 1 - fragTexCoord.y); // flipping
vec2 textureResolution = vec2(renderWidth, renderHeight);
//vec2 onePixel = vec2(1.0, 1.0) / textureResolution; // distance of a single pixel in texels
vec2 pixelCoor = flipped * textureResolution;
//float gridify(float coordinate, float spacing) {
// return clamp(floor(((-cos( coordinate * 2 * PI)) / 2) + spacing), 0.0, 1.0);
//}
//float is_pixel(vec2 coordinate, float spacing) {
// return gridify(coordinate.x, spacing) * gridify(coordinate.y, spacing);
//}
float stretch(float coordinate, float intensity) {
return (-pow(((2.0 * coordinate * intensity) - stretch_amount), 3.0));
}
void main()
{
//float is_pixel = gridify(pixelCoor.x, 1.0) * gridify(pixelCoor.y, 1.0);
flipped.y += stretch(flipped.y, stretch_amount) * (pow(flipped.x - 0.5, 2) * 2);
flipped.x += stretch(flipped.x, stretch_amount) * (pow(flipped.y - 0.5, 2) * 2);
vec4 texelColor = texture(texture0, flipped);
if (flipped.y > 1.0 || flipped.y < 0.0 || flipped.x < 0.0 || flipped.x > 1.0) {
texelColor = vec4(0.0,0.0,0.0,1.0);
}
// NOTE: Implement here your fragment shader code
finalColor = texelColor*colDiffuse;
}
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