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* 2d/sprite.scm: (sprite-vertex): Remove color vertex.
(r-offset): Delete it.
(pack-sprite-vertices): Remove logic moved to shader.
(draw-sprite-vertices): Remove color vertex array rendering.
(sprite-shader): New variable.
(<sprite>): Remove dirty field and adjust setters.
(make-anchor): New procedure.
(update-sprite-vertices!): Use new 'pack-sprite-vertices'.
(make-sprite): Use 'make-anchor' and 'update-sprite-vertices!'.
(dirty-sprite-setter): Delete it.
(load-sprite): Formatting.
(sprite-animation-texture): Delete it.
(drawable-texture): New procedure.
(sprite-texture): Extract body to 'drawable-texture'.
(sprite-anchor-vector): Delete it.
(set-sprite-anchor!): Reimplemented.
(update-sprite-animator!): Update vertices.
(draw-sprite): Use shader program.
(<sprite-batch>, make-sprite-batch, sprite-batch?,
sprite-batch-max-size, sprite-batch-size, set-sprite-batch-size!,
sprite-batch-texture, set-sprite-batch-texture!,
sprite-batch-vertices, sprite-batch-draw, with-sprite-batch): Delete
all sprite batch code.
* data/Makefile.am (shadersdir, shaders_DATA): New variables.
* data/shaders/sprite-fragment.glsl: New shader.
* data/shaders/sprite-vertex.glsl: New shader.
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