Code : Tout sélectionner
;
; Native OpenGL Test
;
; (c) Fantaisie Software
;
; This source is based on an ASM source code found on the web (can't remember which one).
;
; Axis explainations:
;
; +
; y
;
; |
; |
; + |
; x ---------\
; \
; \
; \
; z+
;
; So a rotate on the y axis will take the y axis as center. With OpenGL, we can specify
; positive And negative value. Positive values are always in the same sens as the axis
; (like described on the schmatic, with '+' signs)
;
IncludeFile "OpenGL.pbi"
Global RollAxisX.f
Global RollAxisY.f
Global RollAxisZ.f
Global RotateSpeedX.f
Global RotateSpeedY.f
Global RotateSpeedZ.f
Global ZoomFactor.f
Procedure DrawCube(hdc)
glPushMatrix_() ; Save the original Matrix coordinates
glMatrixMode_(#GL_MODELVIEW)
glTranslatef_(0, 0, ZoomFactor) ; move it forward a bit
glRotatef_ (RollAxisX, 1.0, 0, 0) ; rotate around X axis
glRotatef_ (RollAxisY, 0, 1.0, 0) ; rotate around Y axis
glRotatef_ (RollAxisZ, 0, 0, 1.0) ; rotate around Z axis
RollAxisX + RotateSpeedX
RollAxisY + RotateSpeedY
RollAxisZ + RotateSpeedZ
; clear framebuffer And depth-buffer
glClear_ (#GL_COLOR_BUFFER_BIT | #GL_DEPTH_BUFFER_BIT)
; draw the faces of a cube
; draw colored faces
glDisable_(#GL_LIGHTING)
glBegin_ (#GL_QUADS)
; Build a face, composed of 4 vertex !
; glBegin() specify how the vertexes are considered. Here a group of
; 4 vertexes (GL_QUADS) form a rectangular surface.
; Now, the color stuff: It's r,v,b but with float values which
; can go from 0.0 To 1.0 (0 is .. zero And 1.0 is full intensity)
glNormal3f_ (0,0,1.0)
glColor3f_ (0,0,1.0)
glVertex3f_ (0.5,0.5,0.5)
glColor3f_ (0,1.0,1.0)
glVertex3f_ (-0.5,0.5,0.5)
glColor3f_ (1.0,1.0,1.0)
glVertex3f_ (-0.5,-0.5,0.5)
glColor3f_ (0,0,0)
glVertex3f_ (0.5,-0.5,0.5)
; The other face is the same than the previous one
; except the colour which is nice blue To white gradiant
glNormal3f_ (0,0,-1.0)
glColor3f_ (0,0,1.0)
glVertex3f_ (-0.5,-0.5,-0.5)
glColor3f_ (0,0,1.0)
glVertex3f_ (-0.5,0.5,-0.5)
glColor3f_ (1.0,1.0,1.0)
glVertex3f_ (0.5,0.5,-0.5)
glColor3f_ (1.0,1.0,1.0)
glVertex3f_ (0.5,-0.5,-0.5)
glEnd_()
; draw shaded faces
glEnable_(#GL_LIGHTING)
glEnable_(#GL_LIGHT0)
glBegin_ (#GL_QUADS)
glNormal3f_ ( 0, 1.0, 0)
glVertex3f_ ( 0.5, 0.5, 0.5)
glVertex3f_ ( 0.5, 0.5,-0.5)
glVertex3f_ (-0.5, 0.5,-0.5)
glVertex3f_ (-0.5, 0.5, 0.5)
glNormal3f_ (0,-1.0,0)
glVertex3f_ (-0.5,-0.5,-0.5)
glVertex3f_ (0.5,-0.5,-0.5)
glVertex3f_ (0.5,-0.5,0.5)
glVertex3f_ (-0.5,-0.5,0.5)
glNormal3f_ (1.0,0,0)
glVertex3f_ (0.5,0.5,0.5)
glVertex3f_ (0.5,-0.5,0.5)
glVertex3f_ (0.5,-0.5,-0.5)
glVertex3f_ (0.5,0.5,-0.5)
glNormal3f_ (-1.0, 0, 0)
glVertex3f_ (-0.5,-0.5,-0.5)
glVertex3f_ (-0.5,-0.5, 0.5)
glVertex3f_ (-0.5, 0.5, 0.5)
glVertex3f_ (-0.5, 0.5,-0.5)
glEnd_()
glPopMatrix_()
glFinish_()
SwapBuffers_(hdc)
EndProcedure
Procedure HandleError (Result, Text$)
If Result = 0
MessageRequester("Error", Text$, 0)
End
EndIf
EndProcedure
pfd.PIXELFORMATDESCRIPTOR
FlatMode = 0 ; Enable Or disable the 'Flat' rendering
WindowWidth = 600 ; The window & GLViewport dimensions
WindowHeight = 600
RotateSpeedX = 5.0 ; The speed of the rotation For the 3 axis
RotateSpeedY = 0
RotateSpeedZ = 5.0
ZoomFactor = 1 ; Distance of the camera. Negative value = zoom back
hWnd = OpenWindow(0, 10, 10, WindowWidth, WindowHeight, "First OpenGL Test")
hdc = GetDC_(hWnd)
pfd\nSize = SizeOf(PIXELFORMATDESCRIPTOR)
pfd\nVersion = 1
pfd\dwFlags = #PFD_SUPPORT_OPENGL | #PFD_DOUBLEBUFFER | #PFD_DRAW_TO_WINDOW
pfd\dwLayerMask = #PFD_MAIN_PLANE
pfd\iPixelType = #PFD_TYPE_RGBA
pfd\cColorBits = 16
pfd\cDepthBits = 16
pixformat = ChoosePixelFormat_(hdc, pfd)
HandleError( SetPixelFormat_(hdc, pixformat, pfd), "SetPixelFormat()")
hrc = wglCreateContext_(hdc)
HandleError( wglMakeCurrent_(hdc,hrc), "vglMakeCurrent()")
glMatrixMode_(#GL_PROJECTION)
gluPerspective_(30.0, WindowWidth/WindowHeight, 1.0, 10.0)
; position viewer
glMatrixMode_(#GL_MODELVIEW)
glTranslatef_(0, 0, -5.0)
If (FlatMode)
glShadeModel_(#GL_FLAT)
Else
glShadeModel_(#GL_SMOOTH)
EndIf
glEnable_(#GL_DEPTH_TEST) ; Enabled, it slowdown a lot the rendering. It's to be sure than the
; rendered objects are inside the z-buffer.
glEnable_(#GL_CULL_FACE) ; This will enhance the rendering speed as all the back face will be
; ignored. This works only with CLOSED objects like a cube... Singles
; planes surfaces will be visibles only on one side.
glViewport_(0, 0, WindowWidth-30, WindowHeight-30)
Repeat
Repeat
Event = WindowEvent()
Select Event
Case #PB_Event_CloseWindow
Quit = 1
EndSelect
Until Event = 0
DrawCube(hdc)
Delay(20)
Until Quit = 1
