where did i do wrong?

BlitzMax Forums/OpenGL Module/where did i do wrong?

Akat	(Posted 2006) [#1]

where did i do wrong here?

Strict
'global
Global vertices:Float[] = [1.0,-1.0,0.0,-1.0,-1.0,0.0,0.0,1.0,0.0]

Global colors:Int[] = [255,50,160,180,255,70,90,10,255]
Global triangleBuffer:Int[1]

Init()
setupProjection()

While Not KeyHit(key_escape)
	render()
	Flip
Wend
End

Function Init()
	glEnableClientState GL_VERTEX_ARRAY
	glEnableClientState GL_COLOR_ARRAY
	
	glGenBuffers 1,Varptr triangleBuffer[0]
	glBindBuffer GL_ARRAY_BUFFER,triangleBuffer[0]
	glBufferData GL_ARRAY_BUFFER,9*(SizeOf(32) + SizeOf(8)),Null,GL_STATIC_DRAW
	glBufferSubData GL_ARRAY_BUFFER,0,9*SizeOf(32),vertices
	glBufferSubData GL_ARRAY_BUFFER,9*SizeOf(32),9*SizeOf(8),colors
	
	glVertexPointer 3,GL_FLOAT,0,vertices
	glColorPointer 3,GL_UNSIGNED_BYTE,0,colors
EndFunction

Function setupProjection()
	'glViewport 0,0,640,480
	GLGraphics 640,480
	glMatrixMode GL_PROJECTION
	glLoadIdentity
	gluPerspective 45.0,Float(GraphicsWidth())/Float(GraphicsHeight()),1.0,1000.0
EndFunction

Function render()
	glClear GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT
	glMatrixMode GL_MODELVIEW
	glLoadIdentity
	gluLookAt 0.0,0.0,10.0,0.0,0.0,0.0,0.0,0.1,0.0
	glDrawArrays GL_TRIANGLES,0,3
EndFunction

Akat	(Posted 2006) [#2]

anyone can run this?

fredborg

(Posted 2006) [#3]

You need to call glewInit() before using OpenGL extensions, such as glGenBuffers. Additionally you need to initialize your gl context before starting to bind anything. So use this:

setupProjection()
glewInit()
Init()