Code: Select all
struct gfxpipe {
unsigned long *dmatadrA; // 'pipe 1' ... base of allocatted pipeline memory
unsigned long *dmatadrB; // 'pipe 2' ... dmatadrA + (memsize / 2)
unsigned int memsize; // # of bytes allocatted to the pipelines (total)
unsigned long *curpipe; // pointer to current 'pipe' .. may only be equal to
// either dmatadrA or dmatadrB
unsigned long *curdmatadr; // pointer to the the dma block currently being added to
unsigned long *curgiftag; // pointer to current "block" we can add prims to
// need to add state information of zbuffer, alpha test, etc. in here
int flags; // not implemented yet
};
[...]
int createGfxPipe(gfxpipe *pipeline, void *buffer, int size)
{
if ((int)buffer & 0xf)
return 0;
if (size < 0x1000)
return 0;
pipeline->dmatadrA = (unsigned long *)buffer;
pipeline->dmatadrB = pipeline->dmatadrA + (size >> 4);
pipeline->memsize = size;
initializeGfxPipe(pipeline->dmatadrA);
pipeline->curpipe = pipeline->curdmatadr = pipeline->dmatadrA;
pipeline->curgiftag = pipeline->dmatadrA + 2;
return 1;
}
void initializeGfxPipe(unsigned long *dmatadr)
{
//***** THOSE LINES *****
dmatadr[0] = 0x0000000070000000;
dmatadr[1] = 0;
//***** END *****
//dmatadr[2] = 0x1000000000008000;
//dmatadr[3] = 0x000000000000000e;
}
Code: Select all
void gp_line(gfxpipe *p, unsigned x1, unsigned y1, unsigned x2, unsigned y2, unsigned z, unsigned color)
{
unsigned long dt = *(p->curdmatadr);
*(p->curdmatadr) = (dt & 0xffffffffffff0000) | ((dt & 0xffff) + 3);
p->curgiftag[0] = 0x4400000000008001;
p->curgiftag[1] = 0xffffffffffff5d10;
p->curgiftag[2] = 0x0000000000000001;
p->curgiftag[3] = 0x3f80000000000000 | color;
p->curgiftag[4] = ((unsigned long)z << 32) | (y1 << 16) | x1;
p->curgiftag[5] = ((unsigned long)z << 32) | (y2 << 16) | x2;
p->curgiftag = &p->curgiftag[6]; // advance the packet pointer
gp_checkflush(p);
}