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* chickadee/render/texture.scm (make-apply-texture, texture-ref,
texture-set!): New procedures.
(*texture-states*): New variable.
(apply-texture, *texture-state*): Delete.
(make-texture): Use 'vector-set!'
* chickadee/render/shader.scm: Export 'uniform-type'.
(default-uniform-value): Remove 'sampler-2d' case.
(extract-uniforms): Handle sampler-2d uniforms specially.
* chickadee/render.scm (current-texture): Add 'i' argument.
(with-texture): Add 'n' argument.
(gpu-apply*): Set textures for all texture units.
* .dir-locals.el: Update indentation rules for 'with-texture'.
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