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1

SFML projects / DLgui Update Aug, 26

« on: August 24, 2009, 08:41:28 am »

Update Aug 26,
   I have posted a screen shot of the current version i am working on. Hopefully it makes it easyer to see what i am trying todo?

Here's a project i have been working on, After i have it all cleaned up more I am going to release this gui library under the same license as SFML. Their is still a lot of ruff edges that i want to clean up before anyone uses it. Below I have provided a link to the current code if I could get some people to take a peek at it and tell me what you think.

http://www.distant-light.net/DistantLightSoftware.zip

Currently the feature list is pretty descent.
* Render once draw many style system prevents needlessly redrawing text and other things every frame by using FBO's to store textures of the rendered Gui
* Themeing support through 9 slice rendering This also benefits from the FBO use.
* completely Shader driven

Things I have planned after I can get some review of what I have already done.
* more widgets (I have more that I didn't include in the zip above I want to see reaction to my object model before I put to much effort into this)
* Everything theme able.
* Easier to integrate with game applications
* look and feel will be very modifiable.

If their is something you would like to see that I don't currently have listed, please tell me and I will maybe add that to what I am trying todo.

2

Graphics / sf::view and FBO's

« on: July 29, 2009, 02:25:04 am »

I have been trying to intermingle sfml calls with opengl calls on FBO's and they work so long as the FBO is the same size as the screen. Mostly I want to be able to use sf::string to an FBO of some size other then whatever the screen is set to.  I am guessing that i am not setting up the sf::View correctly but after much experimentation I though it might be worthwhile to ask.

I will note that i am using the GL_TEXTURE_RECTANGLE_ARB extension.

Code: [Select]


class GuiImage
{
private:
GLuint FrameObjectId;
GLuint TextureObjectId;

GLuint Width,Height;

public:
GuiImage(GLuint w, GLuint h) :
 Width(w), Height(h), FrameObjectId(0), TextureObjectId(0)
{
glGenFramebuffersEXT(1,&FrameObjectId);
glGenTextures(1,&TextureObjectId);
glBindTexture(
GL_TEXTURE_RECTANGLE_ARB,
TextureObjectId);

glTexImage2D(
GL_TEXTURE_RECTANGLE_ARB,
0, GL_RGBA8,Width,Height,0,GL_RGBA,GL_UNSIGNED_BYTE,0);

glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,FrameObjectId  );

glFramebufferTexture2DEXT(
GL_FRAMEBUFFER_EXT,
GL_COLOR_ATTACHMENT0_EXT,
GL_TEXTURE_RECTANGLE_ARB,
TextureObjectId,0);

glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
};

~GuiImage()
{
glDeleteFramebuffersEXT(1,&FrameObjectId);
glDeleteTextures(1,&TextureObjectId);
};

void SetActive( bool active)
{
if(active)
{
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT,FrameObjectId  );

glViewport(0, 0, Width, Height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();

gluOrtho2D(0,Width,Height, 0);
glMatrixMode(GL_MODELVIEW);
glColor4f(1.f,1.f,1.f,1.f);
//glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

}
else
{
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
}
};

sf::View GetView( void )
{
//sf::View myview(
// sf::FloatRect(0.f,0.f,Width,Height));
sf::View myview(
sf::Vector2f(Width/2,Height/2),
sf::Vector2f(Width/2,Height/2));
return myview;
};

void Bind( void )
{
glBindTexture(
GL_TEXTURE_RECTANGLE_ARB,
TextureObjectId);
glEnable(GL_TEXTURE_RECTANGLE_ARB);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_RECTANGLE_ARB, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
int err = glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
if(err != 0x8CD5 )
std::cout<<"error using fbo! "<<err<<std::endl;
};

GLuint GetWidthi() const
{
return Width;
};

GLuint GetHeighti() const
{
return Height;
};

GLfloat GetWidthf() const
{
return static_cast<GLfloat>(Width);
};

GLfloat GetHeightf() const
{
return static_cast<GLfloat>(Height);
};

};