I will try to go with this project, but first i am going to write the program in C and test it in my pc, i am still working on a reliable video display emulator, here is the code, written in Visual Studio 2010, Visual C++:
Code:
// CGA.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include "CGA.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#endif
// The one and only application object
CWinApp theApp;
using namespace std;
void OnDraw(CDC* pDC);
char frameBuffer[192][256]={0};
int c=100;
void GdiOut(HDC hdc)//this function is not boilerplate
{
HPEN hPen, hPenOld;
HBRUSH hBrush, hBrushOld;
char luma;
for(int x=0;x<256;x++)
for(int y=0;y<128;y++)
{
//Initial colors
luma=(frameBuffer[y][x]&192)/4/4/2;
BYTE bRed = (frameBuffer[y][x]&3)*16*luma;
BYTE bGreen = (frameBuffer[y][x]&12)*4*luma;
BYTE bBlue = (frameBuffer[y][x]&48)*luma;//needs some adjusments
//Pen color
COLORREF cPen = RGB(bRed, bGreen, bBlue);
COLORREF cBrush = RGB(233,GetGValue(cPen), 255);
hPen = CreatePen(PS_SOLID, 0, cPen);
hBrush = CreateSolidBrush(cBrush);
hPenOld = (HPEN)SelectObject(hdc, hPen);
hBrushOld = (HBRUSH)SelectObject(hdc, hBrush);
Rectangle(hdc, (x*2)+c, (y*2)+c, (x*2)+2+c, (y*2)+2+c);
DeleteObject(hPen);
SelectObject(hdc, hBrushOld);
DeleteObject(hBrush);
}
}
void drawScreen(){//this function is not boilerplate
HDC screenDC = ::GetDC(NULL);
HDC hdc = GetDC(NULL);
GdiOut(hdc);
}
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
int nRetCode = 0;
HMODULE hModule = ::GetModuleHandle(NULL);
if (hModule != NULL)
{
// initialize MFC and print and error on failure
if (!AfxWinInit(hModule, NULL, ::GetCommandLine(), 0))
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: MFC initialization failed\n"));
nRetCode = 1;
}
else//----------------------------------------------------------------- the code above is boilerplate code
{// int main() {
int px,py,in;
float points[100][4]={
{1,-10,10,110},
{1,0,10,110},
{1,10,10,110},
{11,10,10,110},
{25,5,10,210},
{25,10,10,210},
{30,5,10,210},
{30,10,10,210},
{35,-10,10,200},
{35,0,10,200},
{35,10,10,200},
{45,10,10,200},
{-30,-11,25,189},
{-30,-15,30,157},
{-30,-20,25,140},
{-30,-25,40,155},
{-30,-30,45,179}
};
int numz=20;
printf("Pomak u z? (npr 2)");
do
{
for(int j=0;j<192;j++)
for(int i=0;i<256;i++)
frameBuffer[j][i]=0;//moco
for(int n=0;n<numz;n++)
{
px = int((points[n][0] / points[n][2] * 20.0) + 128);
py = int((points[n][1] / points[n][2] * 20.0) + 96);
//printf("%f %f %f %f %d %d\n",points[n][0],points[n][1],points[n][2],points[n][3],px,py);
if(px > 0 && px < 256)
if(py > 0 && py < 192)
frameBuffer[py][px]=points[n][3];
}
drawScreen();
scanf("%d",&in);
for(int n=0;n<numz;n++)
points[n][2]+=in;
}while(in);
//system("echo off");
//system("pause>nul");
}// return 0; }
}//-------------------------------------------------------------------------------- the code below is boilerplate code (with exceptions)
else
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: GetModuleHandle failed\n"));
nRetCode = 1;
}
return nRetCode;
}
This is the main file, CGA the name does not mean Color Graphic Adapter, it something else that i already forgot what it meant...
This example emulates the screen, and renders some points in a LOL formation, you may zoom in and out.
Does anybody know a better solution for generating color graphics in C/C++?
As for the hardware, i am still undecided how would it work, it is maybe best if it would consist of two mcu-s, one for loading, managing, and controlling(moving rotating, ect...) objects, and one for rendering objects. They would be connected trough a common ram, but i would prefer a solution where there is a big bus, controlled by a cpld/fpga, and any mcu may access to the common ram, framebuffer, and to the 8087. But i still have no idea how to wire this up, without creating a queue when the devices are accessing different hardware components(example: one mcu access the common ram, the other the framebuffer).
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