GLSL

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What's GLSL ? Briefly GLSL is an high level languange over graphics card. It provides an abstraction layer on graphics card. If you want to use GLSL codes in your application. you must load, compile and bind to OpenGL. SWEngine simplifies these steps.

GLSL code in SWEngine

diognalblur=swGraphicsCreateGLSLShader("fixed.vert","diognalblur.frag");

Sample Usage
Pressing keyboard 1,2,3,4,5,6,7,8,9,0 keys actives different shaders.

  • 0=Disabled
  • 1=Diognal Blur
  • 2=Edge Detection
  • 3=Emboss
  • 4=Inverted
  • 5=Bloom
  • 6=Sharpen
  • 7=Multiplier
  • 8=Sampling Coord
  • 9=Sampling Coord Ex

I taked this shader examples from facewound web site. You can access shader details in this web site

Api Docs
SwEngine, swInput, swGraphics, swRect, swApplication


Shader ScreenShots

Disabled

Diognal Blur

Edge Detection

Emboss

Inverted

Bloom

Sharpen

Multiplier

Sampling Coord

Sampling Coord Ex



Source Code 

#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 glslApp;
swKeyboardState keybState;
int imgID=-1;
int fontID=-1;
swRect rect={0,0,512,512};
int diognalblur=SW_DISABLED_SHADER_ID;
int edgedetection=SW_DISABLED_SHADER_ID;
int emboss=SW_DISABLED_SHADER_ID;
int inverted=SW_DISABLED_SHADER_ID;
int bloom=SW_DISABLED_SHADER_ID;
int sharpen=SW_DISABLED_SHADER_ID;
int multiplier=SW_DISABLED_SHADER_ID;
int samplingCoord=SW_DISABLED_SHADER_ID;
int samplingCoordexp=SW_DISABLED_SHADER_ID;
int activeShaderID=SW_DISABLED_SHADER_ID;
 
 
//-------------------------------------------------------------------------------------------
void GameLoop(){ 
 
 
	//Input Handling
	swInputListenKeyboard(&keybState);
	if(keybState.keyESCAPE){
		swEngineExit();
	}
 
	if(keybState.key0)
		activeShaderID=SW_DISABLED_SHADER_ID;
 
	if(keybState.key1)
		activeShaderID=diognalblur;
 
	if(keybState.key2)
		activeShaderID=edgedetection;
 
	if(keybState.key3)
		activeShaderID=emboss;
 
	if(keybState.key4)
		activeShaderID=inverted;
 
	if(keybState.key5)
		activeShaderID=bloom;
 
	if(keybState.key6)
		activeShaderID=sharpen;
 
	if(keybState.key7)
		activeShaderID=multiplier;
 
	if(keybState.key8)
		activeShaderID=samplingCoord;
 
	if(keybState.key9)
		activeShaderID=samplingCoordexp;
 
 
 
	swGraphicsBeginScene();
 
	    //Background
		swGraphicsSetBgColor0(0.6f,0.6f,0.6f);
 
		//Img Rendering
		swGraphicsActiveGLSLShader(activeShaderID);
		swGraphicsSetColor0(1,1,1,1);
		swGraphicsRenderImg0(imgID,&rect);
 
		//Info Rendering
		swGraphicsActiveGLSLShader(SW_DISABLED_SHADER_ID);
		swGraphicsSetBlendingMode(SW_BLENDING_MODE_ADDITIVE);
		swGraphicsRenderText(fontID,0,16,515,450,0,"Key0=Disabled Shader");
		swGraphicsRenderText(fontID,0,16,515,430,0,"Key1=Diognal Blur");
		swGraphicsRenderText(fontID,0,16,515,410,0,"Key2=Edge Detection");
		swGraphicsRenderText(fontID,0,16,515,390,0,"Key3=Emboss");
		swGraphicsRenderText(fontID,0,16,515,370,0,"Key4=Inverted");
		swGraphicsRenderText(fontID,0,16,515,350,0,"Key5=Bloom");
		swGraphicsRenderText(fontID,0,16,515,330,0,"Key6=Sharpen");
		swGraphicsRenderText(fontID,0,16,515,310,0,"Key7=Multiplier");
		swGraphicsRenderText(fontID,0,16,515,290,0,"Key8=Sampling Coord");
		swGraphicsRenderText(fontID,0,16,515,270,0,"Key9=Sampling CoordEx");
	swGraphicsEndScene();
}
 
 
 
 
 
//-------------------------------------------------------------------------------------------
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nShowCmd)
{ 
 
 
	//Application Settings
	glslApp.hInstance=hInstance;
	glslApp.fullScreen=false;
	glslApp.cursor=true;
	glslApp.width=800;
	glslApp.height=600;
	glslApp.title="GLSL";
	glslApp.path="\\rsc\\GLSL\\";
	glslApp.appRun=GameLoop;
 
	//Application Execution
	swEngineInit(&glslApp);
 
	if(!swGraphicsIsSupportGLSL()){
		swEngineExit();
		return 0; //exit
	}
 
	//InitApp
	imgID=swGraphicsCreateImg("fruits.tga");
	fontID=swGraphicsCreateFont("font.tga");
	diognalblur=swGraphicsCreateGLSLShader("fixed.vert","diognalblur.frag");
	edgedetection=swGraphicsCreateGLSLShader("fixed.vert","edgedetection.frag");
	emboss=swGraphicsCreateGLSLShader("fixed.vert","emboss.frag");
	inverted=swGraphicsCreateGLSLShader("fixed.vert","inverted.frag");
	bloom=swGraphicsCreateGLSLShader("fixed.vert","bloom.frag");
	sharpen=swGraphicsCreateGLSLShader("fixed.vert","sharpen.frag");
	multiplier=swGraphicsCreateGLSLShader("fixed.vert","multiplier.frag");
	samplingCoord=swGraphicsCreateGLSLShader("fixed.vert","samplingcoord.frag");
	samplingCoordexp=swGraphicsCreateGLSLShader("fixed.vert","samplingcoordexp.frag");
	activeShaderID=SW_DISABLED_SHADER_ID;
 
	swEngineRun();
	swEngineExit();
 
	return 0;
}


Öncelikle kartınızın GLSL uyumlu olup olmadığını sorgulamamız gerekiyor. Bunun için aşağıdaki fonksiyon çağrılır. Desteklemiyorsa uygulamadan çıkılır. 

if(!swGraphicsIsSupportGLSL()){
		swEngineExit();
		return 0; //exit
	}


Shader dosyaları vertex ve fragment olmak üzere 2 farklı dosyada tutulur. Aşağıdaki kodla belirtilen dosyalar okunarak sisteme entegre edilir. 

inverted=swGraphicsCreateGLSLShader("fixed.vert","inverted.frag");

İstenen shader'in aktif olması için aşağıdaki kod çağrılır. 

swGraphicsActiveGLSLShader(inverted);
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