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39 lines
1.0 KiB
Plaintext
39 lines
1.0 KiB
Plaintext
/**
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* Landscape
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* Simple raymarching shader with camera, originally by Paulo Falcão
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* Ported from the webGL version in GLSL Sandbox:
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* http://glsl.heroku.com/e#3213.0
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*
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*/
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PShader landscape;
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PGraphics pg;
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void setup() {
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size(640, 360, P2D);
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// This effect can be too demanding on older GPUs,
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// so we render it on a smaller res offscreen surface
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pg = createGraphics(320, 180, P2D);
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pg.noStroke();
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landscape = loadShader("landscape.glsl");
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landscape.set("resolution", float(width), float(height));
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}
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void draw() {
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landscape.set("time", millis() / 1000.0);
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landscape.set("mouse", float(mouseX), height - float(mouseY));
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// This kind of raymarching effects are entirely implemented in the
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// fragment shader, they only need a quad covering the entire view
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// area so every pixel is pushed through the shader.
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pg.beginDraw();
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pg.shader(landscape);
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pg.rect(0, 0, width, height);
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pg.endDraw();
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// Scaling up offscreen surface to cover entire screen.
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image(pg, 0, 0, width, height);
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}
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