Mixing Max2D and OpenGL

BlitzMax Forums/BlitzMax OpenGL Programming/Mixing Max2D and OpenGL

Hi. I was wondering if it's still possible to mix Max2D and OpenGL. Would be nice to use Max2D for GUI stuff and then plain GL for 3D.

ghislain

it can be done. but mark didn't recommand it some time ago. because it might interfere with the max2d internals. be ready for some awkward effects...
i think you will be most succesfull if you do all your 2dmax stuff first followed by the 3d stuff [or vv]..

ghislain

ozak

Right. I'll give it ago. Figures you should'nt mix Max2D and GL (dangerous coctail or something ;)

ozak

Hmm. I tried multiple solutions, but I can't seem to mix Max2D and GL. If I create the screen by GL context, Max2D crashes with a null pointer exception and If I do Graphics and then GL commands, they just get ignored.

Anyone?

EDIT: I'm a bum. Forgot BMax defaults to DX on windooze. Set GL driver and all is fine :) Still some issues though :)

ozak

Quick hack of Nehe Tutorial 5.
I got a yellow max2d box on screen and a rotating triangle.
Problems:

- DrawText removes all OpenGL stuff from screen.
- I can't clear the color buffer of use Cls as either Max2D or GL stuff disappears.

I would appreciate any help towards a rock solid Max2D/OpenGL implementation :)


Framework BRL.GLMax2D


SetGraphicsDriver GLMax2DDriver()
Graphics 640,480,0



Global rtri:Float									'Angle For The Triangle ( New )

	

While Not KeyHit( KEY_ESCAPE )
	
	SetColor(255,255,0)

	DrawRect(0,0,640,100)	
	SetColor(0,0,255)
	
	'DrawText("Hello GL!",0,0) '<- This removes all OpenGL stuff on screen
	
	' Triangle background not cleared, as I can't clear the color buffer or use CLS
	DoGl()

	Flip()

Wend

Function DoGL()

	
	glPushMatrix
	glenable GL_DEPTH_TEST								'Enables Depth Testing

	glMatrixMode GL_PROJECTION							'Select The Projection Matrix
	glLoadIdentity										'Reset The Projection Matrix

	glFrustum -0.1, 0.1,-0.1, 0.1, 0.1, 100.0				'Setup The Projection Matrix Frustum

	glMatrixMode GL_MODELVIEW							'Select The ModelView Matrix
	glLoadIdentity										'Reset The ModelView Matrix

	glClear GL_DEPTH_BUFFER_BIT		'Clear The Screen And The Depth Buffer
	
	glLoadIdentity									'Reset The ModelView Matrix
	glTranslatef -1.5,0.0,-6.0						'Move Left 1.5 Units And Into The Screen 6.0

	glRotatef rtri,1.0,1.0,0.0						'Rotate The Triangle On The Y axis ( New )
	glBegin GL_TRIANGLES							'Drawing Using Triangles

		glColor3f 1.0,0.0,0.0						'Red
		glVertex3f 0.0, 1.0, 0.0						'Top Of Triangle (Front)
		glColor3f 0.0,1.0,0.0						'Green
		glVertex3f -1.0,-1.0, 1.0					'Left Of Triangle (Front)
		glColor3f 0.0,0.0,1.0						'Blue
		glVertex3f 1.0,-1.0, 1.0						'Right Of Triangle (Front)
	
		glColor3f 1.0,0.0,0.0						'Red
		glVertex3f 0.0, 1.0, 0.0						'Top Of Triangle (Right)
		glColor3f 0.0,0.0,1.0						'Blue
		glVertex3f 1.0,-1.0, 1.0						'Left Of Triangle (Right)
		glColor3f 0.0,1.0,0.0						'Green
		glVertex3f 1.0,-1.0, -1.0					'Right Of Triangle (Right)

		glColor3f 1.0,0.0,0.0						'Red
		glVertex3f 0.0, 1.0, 0.0						'Top Of Triangle (Back)
		glColor3f 0.0,1.0,0.0						'Green
		glVertex3f 1.0,-1.0, -1.0					'Left Of Triangle (Back)
		glColor3f 0.0,0.0,1.0						'Blue
		glVertex3f -1.0,-1.0, -1.0					'Right Of Triangle (Back)

		glColor3f 1.0,0.0,0.0						'Red
		glVertex3f 0.0, 1.0, 0.0						'Top Of Triangle (Left)
		glColor3f 0.0,0.0,1.0						'Blue
		glVertex3f -1.0,-1.0,-1.0					'Left Of Triangle (Left)
		glColor3f 0.0,1.0,0.0						'Green
		glVertex3f -1.0,-1.0, 1.0					'Right Of Triangle (Left)

	glEnd										'Finished Drawing The Pyramid
	

	rtri:+1
	glPopMatrix
	
	
End Function

Jim Brown

This may be of interest to you. From Marks latest worklog:

Besides the GUI, other notable module efforts include the 'unification' of some aspects of the graphics stuff. Commands like Graphics/EndGraphics/GraphicsModes/Flip are now common to a variety of drivers, eg: GL, Max2D, D3D7, D3D9. This means BlitzGL will be going, as you can now get exactly the same functionality from the graphics system, eg:

SetGraphicsDriver GLGraphicsDriver()
Graphics 640,480    'now in 'raw' GL mode!
While Not KeyHit( KEY_ESCAPE )
   glClear GL_SOMETHING_BIT
   Flip
Wend

In fact, there is now a 'GLGraphics' command that does the first 2 lines for you...

I wonder if that means each graphics driver now includes its own set of commands such as DrawText, DrawRect, Cls. Thereby avoiding any mixing of modes(?)

ozak

Sounds good :)

Ibmurai

Can't wait!