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* Converts a world coordinate into a homogenous coordinate in view
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void zbuffer_shadow(struct Render *re, float winmat[][4], struct LampRen *lar, int *rectz, int size, float jitx, float jity);
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void zbuffer_abuf_shadow(struct Render *re, struct LampRen *lar, float winmat[][4], struct APixstr *APixbuf, struct APixstrand *apixbuf, struct ListBase *apsmbase, int size, int samples, float (*jit)[2]);