Rotate
Rotates an input texture based on a specified rotation angle in degrees. It ensures that the resulting rotated coordinates are within the texture bounds. If the rotated coordinates fall outside the bounds, the pixel becomes transparent.
Parameters
texture
Texture: The input texture to be filtered. Default: undefined
rotationAngleDegrees
Float: Rotation angle in degrees. Default: 0.0
Example
let layer,
bird,
rotate;
function preload() {
rotate = createShader(fip.defaultVert, fip.rotate); // Load the shader
bird = loadImage("bird.jpg");
}
function setup() {
createCanvas(600, 600, WEBGL); // Use WEBGL mode to use the shader
layer = createFramebuffer(); // Create a framebuffer to draw the image onto
}
function draw() {
background(0);
// Draw an image to a framebuffer
layer.begin();
clear();
scale(1, -1); // Flip the Y-axis to match the canvas (different coordinate system in framebuffer)
image(bird, -width / 2, -height / 2, width, height);
layer.end();
// Apply the shader
shader(rotate);
// Set the shader uniforms
rotate.setUniform("texture", layer.color); // Set the texture to apply the shader to
rotate.setUniform("rotationAngle", -45);
rect(0, 0, width, height); // Draw a rectangle to apply the shader to
resetShader();
}