[SDL] 2D above OpenGL graphics

[Nicolas Goy - kuon - 時期精]

On 23 Nov 2006, at 02:10, Nuno Santos wrote:

> Ok,
>
> I now got something, but my 3D gets very weird and almost doest  
> shows up.
>
> I would love to have this font rastering on while the 3D stuff is  
> under it.
>
> Is it possible?
>
> I also don't know what is happening with that code.
>
> This is what i got:
>
> void renderScene(void) {
> 	glClearColor(0.0f,0.0f,0.0f,0.0f);
> 	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
> 	
> 	eyeX = sin(angle);
> 	eyeZ = -cos(angle);
> 			
> 	glLoadIdentity();
> 	
> 	gluLookAt((eyeX*c.ex)*zoom,c.ey+eyeY,(eyeZ*c.ez)*zoom,
> 			c.cx,c.cy,c.cz,
> 			0.0f,1.0f,0.0f);
> 				
> 	
> 	glMatrixMode(GL_MODELVIEW);
> 	glPushMatrix();
> 	glLoadIdentity();
> 	glMatrixMode(GL_PROJECTION);
> 	glPushMatrix();
> 	glLoadIdentity();
>
> 	glOrtho( 0, 640, 0, 480, 0.0, 1.0 );
>
>
> 	glMatrixMode(GL_MODELVIEW);
> 	// some 2d drawing like
>
> 	glRasterPos2i(50, 50); // draw at position 0 100 pixel
> 	glutBitmapCharacter(GLUT_BITMAP_8_BY_13, 'H'); // Will draw a H at  
> 100 100, for more advanced text handling or if you don't wanna link  
> with glut, check the opengl.org site for font rastering, SDL also  
> provide true type library.
>
> 	glPopMatrix();
> 	glMatrixMode(GL_PROJECTION);
> 	glPopMatrix();
> 	
> 	
> 	glutSwapBuffers();
> }
>
>
>
> Em Nov 22, 2006, às 6:31 PM, Sami Näätänen escreveu:
>
>> glOrtho( 0, width, 0, height, 0.0, 1.0 );
>
> _

Just a note to the list, I helped Nuno privately.

For reference, the error in the above code is

	glMatrixMode(GL_MODELVIEW);

missing just after glClear. I usualy set the matrixMode I want to  
use, that's why I don't restore it after my 2d "context".

the glOrtho2d was a typo, it's glOrtho or gluOrtho2D.

Best regards


-- 
Kuon
CEO - Goyman.com SA
http://www.goyman.com/

"Computers should not stop working when the users' brain does."



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