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/***************************************************************************
* Copyright (C) 2016 by iCatButler *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
***************************************************************************/
/**************************************************************************
* pgxp_gpu.c
* PGXP - Parallel/Precision Geometry Xform Pipeline
*
* Created on: 25 Mar 2016
* Author: iCatButler
***************************************************************************/
#include "pgxp_gpu.h"
#include "stdafx.h"
#include "externals.h"
#include <math.h>
typedef struct
{
float x;
float y;
float z;
unsigned int valid;
unsigned int count;
} PGXP_vertex;
const unsigned int primStrideTable[] = { 1, 2, 1, 2, 2, 3, 2, 3, 0 };
const unsigned int primCountTable[] = { 3, 3, 4, 4, 3, 3, 4, 4, 0 };
PGXP_vertex* PGXP_Mem = NULL; // pointer to parallel memory
unsigned int currentAddr = 0; // address of current DMA
// Set current DMA address and pointer to parallel memory
void CALLBACK GPUpgxpMemory(unsigned int addr, unsigned char* pVRAM)
{
if (pVRAM)
PGXP_Mem = (PGXP_vertex*)(pVRAM);
currentAddr = addr;
}
// Set current DMA address
void PGXP_SetAddress(unsigned int addr)
{
currentAddr = addr;
}
// Get parallel vertex values
int PGXP_GetVertices(unsigned int* addr, void* pOutput)
{
unsigned int primCmd = ((*addr >> 24) & 0xff); // primitive command
unsigned int primIdx = (primCmd - 0x20) >> 2; // index to primitive lookup
OGLVertex* pVertex = (OGLVertex*)pOutput; // pointer to output vertices
unsigned int stride = primStrideTable[primIdx]; // stride between vertices
unsigned int count = primCountTable[primIdx]; // number of vertices
PGXP_vertex* primStart = NULL; // pointer to first vertex
if (PGXP_Mem == NULL)
return 0;
// Offset to start of primitive
primStart = &PGXP_Mem[currentAddr + 1];
for (unsigned i = 0; i < count; ++i)
{
if (primStart[stride * i].valid)
{
pVertex[i].x = primStart[stride * i].x;
pVertex[i].y = primStart[stride * i].y;
}
}
return 1;
}
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