Post Processing tutorial & SSAO filter

[Kazar]

I saw the thread about the improved SSAO filter and decided to test out the old filter with the code (and assets) from the Post Processing tutorial. Alas, I ran into some errors so I edited the source a bit, like replacing exitapp with the method from 2.28 ProjectWizard and added RegisterAbstractPath to my SDK folder.

 

What it all comes down to is this error: Unhandled exception at 0x00ccc9e8 in PostProcessing_test-Debug.exe: 0xC0000005: Access violation reading location 0x00000068.

The app hangs at BindTexture -> CXX0030: Error: expression cannot be evaluated.

 

 

Here is the source:

#include "engine.h"
int main(int argc, char** argv)
{
Initialize();
	RegisterAbstractPath("D:/Leadwerks");
//Create a graphics context
Graphics(800,600);
//Create a world
TWorld world=CreateWorld();
if (!world) {
	MessageBoxA(0,"Error","Failed to create world.",0);
	return Terminate();
}
//Create a camera
TCamera cam=CreateCamera();
MoveEntity(cam,Vec3(0,5,-5));
CameraClearMode(cam,BUFFER_DEPTH);
//Create a render buffer for lighting
TBuffer gbuffer=CreateBuffer(800,600,BUFFER_COLOR|BUFFER_DEPTH|BUFFER_NORMAL);
//Create a render buffer for post-processing effects
TBuffer postbuffer=CreateBuffer(800,600,BUFFER_COLOR);
//Create a directional light
TLight light=CreateDirectionalLight();
RotateEntity(light,Vec3(45,45,0));
LoadScene("Scenes/scene.sbx");
//Create a skybox
TWorld background=CreateWorld();
TMesh skybox=CreateCube();
TCamera skycam=CreateCamera();

FlipMesh(skybox);
PaintEntity(skybox,LoadMaterial("abstract::skybox.mat"));
SetWorld(world);
TShader postfilter=LoadShader("abstract::postfilter.vert","abstract::postfilter_ssao.frag");
SetShaderVec2(postfilter,"camerarange",Vec2(0.1,1000));
TTexture noisetexture=LoadTexture("abstract::noise.bmp");
AmbientLight(Vec3(0.5));
EntityColor(light,Vec4(0.15));
TVec3 camrotation=Vec3(0);
float mx=0;
float my=0;
HideMouse();
MoveMouse(GraphicsWidth()/2,GraphicsHeight()/2);
//Main loop
while(!KeyHit(KEY_ESCAPE)) {
	//Camera look
	mx=Curve(MouseX()-GraphicsWidth()/2,mx,6);
	my=Curve(MouseY()-GraphicsHeight()/2,my,6);
	MoveMouse(GraphicsWidth()/2,GraphicsHeight()/2);
	camrotation.X=camrotation.X+my/10.0;
	camrotation.Y=camrotation.Y-mx/10.0;
	RotateEntity(cam,camrotation);
	UpdateAppTime();
	UpdateWorld();
	SetBuffer(gbuffer);
	//Render the background
	RotateEntity(skycam,EntityRotation(cam));
	SetWorld(background);
	RenderWorld();
	//Render the world
	SetWorld(world);
	RenderWorld();
	//Render lighting
	SetBuffer(postbuffer);
	RenderLights(gbuffer);
	//Draw image onscreen with postfilter applied
	SetBuffer(BackBuffer());
	SetShader(postfilter);
	BindTexture(GetDepthBuffer(gbuffer),1);
	BindTexture(noisetexture,10);
	DrawImage(GetColorBuffer(postbuffer),0,GraphicsHeight(),GraphicsWidth(),-GraphicsHeight());
	Flip();
}

return Terminate();
}

[Canardia]

You should use Framework, the tutorials are meant to understand how the engine works internally, but not meant for real games. The texture slot meanings have also changed since the tutorials were written.

 

So your code using Framework would look like:

#include "engine.h"
int main(int argc, char** argv)
{
       Initialize();
       RegisterAbstractPath("D:/Leadwerks");

       //Create a graphics context
       Graphics(800,600);

       //Create a framework
       TFramework fw=CreateFramework();
       TCamera cam=GetLayerCamera(GetFrameworkLayer(0));
       MoveEntity(cam,Vec3(0,5,-5));

       //Create a directional light
       TLight light=CreateDirectionalLight();
       RotateEntity(light,Vec3(45,45,0));
       LoadScene("Scenes/scene.sbx");

       SetSkybox(LoadMaterial("abstract::skybox.mat"));
       SetSSAO(1);
       AmbientLight(Vec3(0.5));
       EntityColor(light,Vec4(0.15));

       TVec3 camrotation=Vec3(0);
       float mx=0;
       float my=0;
       HideMouse();
       MoveMouse(GraphicsWidth()/2,GraphicsHeight()/2);

       //Main loop
       while(!KeyHit(KEY_ESCAPE)) {
               //Camera look
               mx=Curve(MouseX()-GraphicsWidth()/2,mx,6);
               my=Curve(MouseY()-GraphicsHeight()/2,my,6);
               MoveMouse(GraphicsWidth()/2,GraphicsHeight()/2);
               camrotation.X=camrotation.X+my/10.0;
               camrotation.Y=camrotation.Y-mx/10.0;
               RotateEntity(cam,camrotation);
               UpdateFramework();
               RenderFramework();
               Flip(0);
       }
       return Terminate();
}

[Kazar]

Does LE 2.28 include Framework? I'm getting 2.3 as soon as Josh processes my order.

[Canardia]

Yes, but it's a bit different than in LE 2.3, since it's made with C++ source files.