mtxstack.c

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#include <c3d/mtxstack.h>
#include <c3d/uniforms.h>
 
void MtxStack_Init(C3D_MtxStack* stk)
{
    stk->pos = 0;
    stk->unifPos = 0xFF;
    stk->isDirty = true;
    Mtx_Identity(&stk->m[0]);
}
 
void MtxStack_Bind(C3D_MtxStack* stk, GPU_SHADER_TYPE unifType, int unifPos, int unifLen)
{
    stk->unifType = unifType;
    stk->unifPos = unifPos;
    stk->unifLen = unifLen;
    stk->isDirty = true;
}
 
C3D_Mtx* MtxStack_Push(C3D_MtxStack* stk)
{
    if (stk->pos == (C3D_MTXSTACK_SIZE-1)) return NULL;
    stk->pos ++;
    Mtx_Copy(&stk->m[stk->pos], &stk->m[stk->pos-1]);
    return MtxStack_Cur(stk);
}
 
C3D_Mtx* MtxStack_Pop(C3D_MtxStack* stk)
{
    if (stk->pos == 0) return NULL;
    stk->pos --;
    return MtxStack_Cur(stk);
}
 
void MtxStack_Update(C3D_MtxStack* stk)
{
    if (!stk->isDirty) return;
 
    if (stk->unifPos != 0xFF)
        C3D_FVUnifMtxNx4(stk->unifType, stk->unifPos, &stk->m[stk->pos], stk->unifLen);
 
    stk->isDirty = false;
}