PointSpriteRendering

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This sample demonstrates how to use the OpenGL's ARB_point_sprite extensions to create point sprites. Point sprites are hardware-accelerated billboards, which are capable of being textured. Point sprites are ideal for creating high-performance particle systems because you only have to send a single vertex point or point sprite for each particle instead of four vertices for a regular billboarded quad. CodeSampler Tutorial

SWEgine wraps upper tutorial codes in SWCore.dll. You can access the point sprite api from swGraphics

ScreenShot
Image:PointSprite.jpg


SourceCode

//SWEngine
#include "../../include/SWEngine.h"
 
#pragma comment (lib,"../../lib/SWUtil.lib")    
#pragma comment (lib,"../../lib/SWTypes.lib")    
#pragma comment (lib,"../../lib/SWCore.lib")    
#pragma comment (lib,"../../lib/SWEngine.lib")    
 
 
swApplication pointSpriteApp;
int pointSpriteID=-1;
 
swPoint pointS[3];
swColor colorS[3];
 
 
 
//-------------------------------------------------------------------------------------------
void GameLoop(){ 
 
	swGraphicsBeginScene();
	swGraphicsSetBlendingMode(SW_BLENDING_MODE_ADDITIVE_ACCORDING2_ALPHA);
	swGraphicsRenderPointSprite(pointSpriteID,60,3,colorS,pointS);
	swGraphicsEndScene();
 
}
 
 
//-------------------------------------------------------------------------------------------
void GameInit(){ 
    pointSpriteID=swGraphicsCreatePointSprite("particleX.tga");
	pointS[0].x=100; pointS[0].y=100;
	colorS[0].r=0.2; colorS[0].g=0.8; colorS[0].b=0.8; colorS[0].a=0.5;
 
	pointS[1].x=300; pointS[1].y=300;
	colorS[1].r=0.8; colorS[1].g=0.8; colorS[1].b=0.8; colorS[1].a=1;
 
	pointS[2].x=500; pointS[2].y=500;
	colorS[2].r=1.0; colorS[2].g=0.1; colorS[2].b=0.1; colorS[2].a=1;
 
 
}
 
 
//-------------------------------------------------------------------------------------------
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd)
{ 
 
 
	//Application Settings
	pointSpriteApp.hInstance=hInstance;
	pointSpriteApp.fullScreen=false;
	pointSpriteApp.cursor=true;
	pointSpriteApp.width=800;
	pointSpriteApp.height=600;
	pointSpriteApp.title="Point Sprite";
	pointSpriteApp.path="\\rsc\\PointSprites\\";
	pointSpriteApp.appRun=GameLoop;
 
 
	//Application Execution
	swEngineInit(&pointSpriteApp);
	GameInit();	
	swEngineRun();
	swEngineExit();
 
	return 0;
}
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