Hello,
I'm trying to draw individual pixels to the screen.
First i tried to draw them using line of 1 pixel, it worked but was incredibly slow.
To draw every pixel on a 640x480 screen it takes about 2 seconds...
Then i searched on the forum, and i found out that writing to a buffer, then loading it with sf::Image::LoadFromPixels should be much faster.
So i tried that, it worked and it was indeed much faster, i got about 80-90 fps in release mode.
But the pixels i draw look antialiased or something, the pixel i wanted to draw is not fully drawn and some pixels around it are slightly drawn too...
How can i fix this ? i just want one clean pixel to be drawn.
Also, is the way i draw the fps the most efficient way ? if not, what is the most efficient way ?
My code :
#if _DEBUG
#pragma comment(lib, "sfml-system-s-d.lib")
#pragma comment(lib, "sfml-window-s-d.lib")
#pragma comment(lib, "sfml-graphics-s-d.lib")
#else
#pragma comment(lib, "sfml-system-s.lib")
#pragma comment(lib, "sfml-graphics-s.lib")
#pragma comment(lib, "sfml-window-s.lib")
#endif
#include <SFML/System.hpp>
#include <SFML/Graphics.hpp>
#include <iostream>
//#include <Windows.h>
using namespace std;
#include "CRenderer.h"
#include "CParticle.h"
#include "CPhysics.h"
#define WIDTH 640
#define HEIGHT 480
char textBuffer[1024];
int main()
{
//INITIALIZATION
sf::RenderWindow Window(sf::VideoMode(WIDTH, HEIGHT, 32), "SFML-Test");
Window.Create(sf::VideoMode(WIDTH, HEIGHT, 32), "SFML-Test");
CRenderer Renderer( WIDTH, HEIGHT );
sf::Image ScreenImage;
//MAIN LOOP
while (Window.IsOpened())
{
// Loop through all the events and handle them
sf::Event Event;
while (Window.GetEvent(Event))
{
// Exit when window is close or escape is pressed
if ( (Event.Type == sf::Event::Closed) || ((Event.Type == sf::Event::KeyPressed) && (Event.Key.Code == sf::Key::Escape)) )
Window.Close();
if (Event.Key.Code == sf::Key::F1)
{
sf::Image Screenshot = Window.Capture();
Screenshot.SaveToFile("screenshot.jpg");
}
}
// Clear the window
Window.Clear();
//draw some random stuff
/*for( int x = 0 ; x < WIDTH ; x++ )
{
for( int y = 0 ; y < HEIGHT ; y++ )
{
Renderer.DrawPixel( x, y, sf::Color( x % 255, y % 255, x % 255, 255 ) );
}
}*/
Renderer.DrawPixel( 50, 50, sf::Color( 255, 0, 0 ) );
ScreenImage.LoadFromPixels( WIDTH , HEIGHT, (sf::Uint8*) Renderer._pixelArray );
sf::Sprite ScreenSprite( ScreenImage );
Window.Draw( ScreenSprite );
// Calculate and draw FPS
sf::String Text_FPS;
Text_FPS.SetFont(sf::Font::GetDefaultFont());
sprintf_s( textBuffer, "FPS: %i", (int)(1.0f / Window.GetFrameTime()) );
Text_FPS.SetText(textBuffer);
Text_FPS.SetColor(sf::Color(255, 0, 0));
Text_FPS.Move(5, 5);
Window.Draw(Text_FPS);
// Display window
Window.Display();
}
return EXIT_SUCCESS;
}
class CRenderer {
public:
__int32* _pixelArray;
int _width;
int _height;
CRenderer( int width, int height)
{
_pixelArray = new __int32[width * height];
for( int i = 0 ; i < width * height ; i++ )
{
_pixelArray[i] = 0x00000000;
}
_width = width;
_height = height;
}
~CRenderer()
{
delete[] _pixelArray;
}
bool DrawPixel( int x, int y, sf::Color color ){
__int32 colorTotal = ( ( ( ( color.r ) & 0xff ) << 24 ) | ( ( ( color.g ) & 0xff ) << 16 ) | ( ( ( color.b ) & 0xff ) << 8 ) | ( ( color.a ) & 0xff ) );
if( ( x >= 0 ) && ( x < _width ) && ( y >= 0 ) && ( y < _height ) )
{
_pixelArray[ y * _width + x ] = colorTotal;
return true;
}
return false;
}
};
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