Drawing to texture

[neseir]

Hi

 

Is it possible to use draw commands like the context functions to create a texture runtime ? I think I saw a simular questions where he who asked it solved it by using OpenGL commands instead of functions in Leadwerks but it would be nice if this was supported in the engine.

 

The idea is to create textures with information drawn using functions like drawtext and drawimage and apply the created texture to an entity.

 

Regards

Eirik

[Josh]

The Buffer API is not officially exposed in the docs yet, but it does work. See Source/Classes/Buffer.h for the commands. You can draw to a buffer, then use the buffer's color component as a texture in another material, and it works fine.

[neseir]

Thanks Josh!

 

Will check this later tonight.

 

Regards

Eirik

[klepto2]

Hi,

 

this is the usage i found out to help our glsl god "shadmar"

 

#include "App.h"
using namespace Leadwerks;
App::App() : window(NULL), context(NULL), world(NULL), camera(NULL), buffer(NULL) {}
App::~App() { delete world; delete window; }
Vec3 camerarotation;
#if defined (PLATFORM_WINDOWS) || defined (PLATFORM_MACOS)
bool freelookmode=true;
#else
bool freelookmode=false;
#endif
bool App::Start()
{
//Create a window
window = Window::Create("ShadmarTest");
//Create a context
context = Context::Create(window);
//Create a world
world = World::Create();
//Create a camera
camera = Camera::Create();
camera->Move(0,2,-5);
//Hide the mouse cursor
window->HideMouse();
std::string mapname = System::GetProperty("map","Maps/start.map");
Map::Load(mapname);
//Move the mouse to the center of the screen
window->SetMousePosition(context->GetWidth()/2,context->GetHeight()/2);
//Create Buffer & Texture
buffer = Buffer::Create(256,256,1,0,0);
buffer->SetColorTexture(Texture::Create(256,256));
return true;
}
bool App::Loop()
{
//Close the window to end the program
if (window->Closed()) return false;

//Press escape to end freelook mode
if (window->KeyHit(Key::Escape))
{
 if (!freelookmode) return false;
 freelookmode=false;
 window->ShowMouse();
}
if (freelookmode)
{
 //Keyboard movement
 float strafe = (window->KeyDown(Key:) - window->KeyDown(Key::A))*Time::GetSpeed() * 0.05;
 float move = (window->KeyDown(Key::W) - window->KeyDown(Key::S))*Time::GetSpeed() * 0.05;
 camera->Move(strafe,0,move);
 //Get the mouse movement
 float sx = context->GetWidth()/2;
 float sy = context->GetHeight()/2;
 Vec3 mouseposition = window->GetMousePosition();
 float dx = mouseposition.x - sx;
 float dy = mouseposition.y - sy;
 //Adjust and set the camera rotation
 camerarotation.x += dy / 10.0;
 camerarotation.y += dx / 10.0;
 camera->SetRotation(camerarotation);
 //Move the mouse to the center of the screen
 window->SetMousePosition(sx,sy);
}
//Update world and Time
Time::Update();
world->Update();
//Render to Buffer (CLS Color set to red)
camera->SetClearColor(1.0f,0.0f,0.0f);
buffer->Enable();
buffer->Clear();
world->Render();
buffer->Disable();
//Render to Backbuffer (normal Context) (CLS Color set to black)
camera->SetClearColor(0.0f,0.0f,0.0f);
Context::SetCurrent(context);
world->Render();
//Draw Buffer
context->DrawImage(buffer->GetColorTexture(),0,0,256,256);
context->Sync(false);
return true;
}

 

I hope this will help you.

[neseir]

Hi klepto2

 

Thanks a lot, this is to great help. Both in this specific thing I'm trying to implement and with in some tests I intend to do later using shaders.

 

Regards

Eirik

[shadmar]

You can also use lua and make a prefab scipt (test water prefab script)

 

function Script:Start()
--Create a water material
self.mat = Material:Create()
self.shader = Shader:Load("Shaders/Dynamic/refract+specular.shader") -- Projection shader
self.mat:SetTexture(Texture:Load("Materials/Water/wavemap_Pure3D.tex"),1) -- normal map for refraction
self.mat:SetShader(self.shader)

--Paint me
self.entity:SetMaterial(self.mat);

--create the buffer for color and depth
self.buffer = Buffer:Create(App.window:GetWidth(),App.window:GetHeight(),1,1)
--And a texture for it.
self.buffer:SetColorTexture(Texture:Create(App.window:GetWidth(),App.window:GetHeight()))
end

function Script:Draw()
--Clear and enble the buffer
self.buffer:Clear()
self.buffer:Enable()

--Hide water enity
self.entity:Hide()
--Render to buffer
App.world:Render()
self.buffer:Disable()

--Apply buffer as material
self.mat:SetTexture(self.buffer:GetColorTexture(),0) --get buffer for diffuse
self.mat:SetTexture(self.buffer:GetDepthTexture(),3) --get scene depth

--Switch back to context and show water
Context:SetCurrent(App.context);
self.entity:Show()
end

[neseir]

Thanks to all of You !

 

Got it to work using the two examples here

 

Regards

Eirik