GXSetTexRegionCallback

C Specification

#include <revolution/gx.h>

typedef GXTexRegion *(* GXTexRegionCallback)(const GXTexObj *t_obj, GXTexMapID id);

GXTexRegionCallback GXSetTexRegionCallback( GXTexRegionCallback f );

Arguments

f Pointer to a function which takes GXTexObj and GXTexMapID as arguments and returns a pointer to GXTexRegion.

Return Values

This function returns a pointer to the previous callback function.

Description

The function f is called by GXLoadTexObj to obtain an available texture region. GXInit calls GXSetTexRegionCallback to set a default region-assignment policy. A programmer can override this default region assignment by implementing his own callback function. A pointer to the texture object and the texture map ID that are passed to GXLoadTexObj are provided to the callback function.

// example of simple texture region allocator GXTexRegion *__GXGetTexRegion(const GXTexObj *tex_obj, GXTexMapID id) { #pragma unused(id) static u32 i = 0; return(__GXTexRegionTab[i++ & 0x0007]); } GXSetTexRegionCallback( __GXGetTexRegion ); // GXInit

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