feat(shadertoy): add proper mouse/touch interaction support #293
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- Fix iMouse uniform to match official Shadertoy specification: - iMouse.xy only updates while button/touch is held down - iMouse.zw uses positive values when down, negative when released - Enables proper click detection via iMouse.z > 0 - Add touch event support for mobile devices: - touchstart/touchmove/touchend/touchcancel handlers - Same behavior as mouse events - Update tool description with mouse interaction documentation - Update README with: - Mouse & Touch Interaction feature - Improved Julia Set example with click detection - iMouse specification table and usage examples The iMouse uniform is a core Shadertoy feature used by popular shaders like Star Nest, raymarching examples, and particle systems.
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Summary
This PR fixes and enhances mouse interaction in the Shadertoy example to match the official Shadertoy specification.
Changes
iMouse Uniform Behavior (Spec-compliant)
iMouse.xy(0, 0)iMouse.zw(0, 0)Previous behavior (incorrect):
iMouse.xyalways updated on mousemove (should only update when button down)iMouse.zwreset to 0 on mouseup (should negate to indicate release)New behavior (spec-compliant):
iMouse.xyonly updates while button/touch is heldiMouse.zwis positive when down, negative when releasediMouse.z > 0reliably indicates button is pressedMobile Touch Support
Added touch event handlers for mobile devices:
touchstart/touchmove/touchend/touchcancelDocumentation
Research
iMouse is a core Shadertoy feature expected by the community. Most popular shaders use it:
All major Shadertoy clones/viewers implement mouse support:
Testing
Fixes mouse interaction to match official Shadertoy specification.