This sample demonstrates how to use the 10 primitive types available under OpenGL: points, lines, line strip, line loop, triangles triangle strips, triangle fan, quads, quads strips, and polygon.
It is an adaptation of ogl_primitive_types.cpp, by Kevin Harris, 02/01/05, downloadable at
http://www.codesampler.com/oglsrc/oglsrc_1.htm#ogl_primitive_types' SED_PBWIN - Use the PBWIN compiler
#COMPILE EXE
#DIM ALL
#INCLUDE "GLU.INC"
$WindowCaption = "OpenGL - Primitve Types"
%GL_WINDOWWIDTH = 640 ' Window width
%GL_WINDOWHEIGHT = 480 ' Window height
%GL_BITSPERPEL = 16 ' Color resolution in bits per pixel
%GL_DEPTHBITS = 16 ' Depth of the depth (z-axis) buffer
GLOBAL hDC AS LONG ' Device context handle
GLOBAL g_currentPrimitive AS LONG
TYPE Vertex
r AS BYTE
g AS BYTE
b AS BYTE
a AS BYTE
x AS SINGLE
y AS SINGLE
z AS SINGLE
END TYPE
GLOBAL g_points () AS Vertex
GLOBAL g_lines () AS Vertex
GLOBAL g_lineStrip_and_lineLoop () AS Vertex
GLOBAL g_triangles () AS Vertex
GLOBAL g_triangleStrip () AS Vertex
GLOBAL g_triangleFan() AS Vertex
GLOBAL g_quads () AS Vertex
GLOBAL g_quadStrip () AS Vertex
GLOBAL g_polygon () AS Vertex
' ========================================================================================
' Fills a Vertex structure
' ========================================================================================
MACRO FillVertex (v, r_, g_, b_, a_, x_, y_, z_)
v.r = r_ : v.g = g_ : v.b = b_ : v.a = a_
v.x = x_ : v.y = y_ : v.z = z_
END MACRO
' =======================================================================================
' All the setup goes here
' =======================================================================================
SUB SetupScene (BYVAL hwnd AS DWORD, BYVAL nWidth AS LONG, BYVAL nHeight AS LONG)
g_currentPrimitive = %GL_POLYGON
DIM g_points(4)
FillVertex(g_points(0), 255, 0, 0, 255, 0.0!, 0.0!, 0.0!)
FillVertex(g_points(1), 0, 255, 0, 255, 0.5!, 0.0!, 0.0!)
FillVertex(g_points(2), 0, 0, 255, 255, -0.5!, 0.0!, 0.0!)
FillVertex(g_points(3), 255, 255, 0, 255, 0.0!, -0.5!, 0.0!)
FillVertex(g_points(4), 255, 0, 255, 255, 0.0!, 0.5!, 0.0!)
DIM g_lines(5)
FillVertex(g_lines(0), 255, 0, 0, 255, -1.0!, 0.0!, 0.0!)
FillVertex(g_lines(1), 255, 0, 0, 255, 0.0!, 1.0!, 0.0!)
FillVertex(g_lines(2), 0, 255, 0, 255, 0.5!, 1.0!, 0.0!)
FillVertex(g_lines(3), 0, 255, 0, 255, 0.5!, -1.0!, 0.0!)
FillVertex(g_lines(4), 0, 0, 255, 255, 1.0!, -0.5!, 0.0!)
FillVertex(g_lines(5), 0, 0, 255, 255, -1.0!, -0.5!, 0.0!)
'//
'// Note:
'//
'// We'll use the same vertices for both the line-strip and line-loop
'// demonstrations. The difference between the two primitive types will not be
'// noticeable until the vertices are rendered. Line-loop works exactly like
'// line-strip except it creates a closed loop by automatically connecting
'// the last vertex to the first with a line segment.
'//
DIM g_lineStrip_and_lineLoop(5)
FillVertex(g_lineStrip_and_lineLoop(0), 255, 0, 0, 255, 0.5!, 0.5!, 0.0!)
FillVertex(g_lineStrip_and_lineLoop(1), 0, 255, 0, 255, 1.0!, 0.0!, 0.0!)
FillVertex(g_lineStrip_and_lineLoop(2), 0, 0, 255, 255, 0.0!, -0.0!, 0.0!)
FillVertex(g_lineStrip_and_lineLoop(3), 255, 255, 0, 255, -1.0!, 0.0!, 0.0!)
FillVertex(g_lineStrip_and_lineLoop(4), 255, 0, 0, 255, 0.0!, 0.0!, 0.0!)
FillVertex(g_lineStrip_and_lineLoop(5), 255, 0, 0, 255, 0.0!, 1.0!, 0.0!)
DIM g_triangles(5)
FillVertex(g_triangles(0), 255, 0, 0, 255, -1.0!, 0.0!, 0.0!)
FillVertex(g_triangles(1), 0, 0, 255, 255, 1.0!, 0.0!, 0.0!)
FillVertex(g_triangles(2), 0, 255, 0, 255, 0.0!, 1.0!, 0.0!)
FillVertex(g_triangles(3), 255, 255, 0, 255, -0.5!, 1.0!, 0.0!)
FillVertex(g_triangles(4), 255, 0, 0, 255, 0.5!, -1.0!, 0.0!)
FillVertex(g_triangles(5), 0, 255, 255, 255, 0.0!, -0.5!, 0.0!)
DIM g_triangleStrip(7)
FillVertex(g_triangleStrip(0), 255, 0, 0, 255, -2.0!, 0.0!, 0.0!)
FillVertex(g_triangleStrip(1), 0, 0, 255, 255, -1.0!, 0.0!, 0.0!)
FillVertex(g_triangleStrip(2), 0, 255, 0, 255, -1.0!, 1.0!, 0.0!)
FillVertex(g_triangleStrip(3), 255, 0, 255, 255, 0.0!, 0.0!, 0.0!)
FillVertex(g_triangleStrip(4), 255, 255, 0, 255, 0.0!, 1.0!, 0.0!)
FillVertex(g_triangleStrip(5), 255, 0, 0, 255, 1.0!, 0.0!, 0.0!)
FillVertex(g_triangleStrip(6), 0, 255, 255, 255, 1.0!, 1.0!, 0.0!)
FillVertex(g_triangleStrip(7), 0, 255, 0, 255, 2.0!, 1.0!, 0.0!)
DIM g_triangleFan(5)
FillVertex(g_triangleFan(0), 255, 0, 0, 255, 0.0!, -1.0!, 0.0!)
FillVertex(g_triangleFan(1), 0, 255, 255, 255, 1.0!, 0.0!, 0.0!)
FillVertex(g_triangleFan(2), 255, 0, 255, 255, 0.5!, 0.5!, 0.0!)
FillVertex(g_triangleFan(3), 255, 255, 0, 255, 0.0!, 1.0!, 0.0!)
FillVertex(g_triangleFan(4), 0, 0, 255, 255, -0.5!, 0.5!, 0.0!)
FillVertex(g_triangleFan(5), 0, 255, 0, 255, -1.0!, 0.5!, 0.0!)
DIM g_quads(11)
FillVertex(g_quads(0), 255, 0, 0, 255, -0.5!, -0.5!, 0.0!)
FillVertex(g_quads(1), 0, 255, 0, 255, 0.5!, -0.5!, 0.0!)
FillVertex(g_quads(2), 0, 0, 255, 255, 0.5!, 0.5!, 0.0!)
FillVertex(g_quads(3), 255, 255, 0, 255, -0.5!, 0.5!, 0.0!)
FillVertex(g_quads(4), 255, 0, 255, 255, -1.5!, -1.5!, 0.0!)
FillVertex(g_quads(5), 0, 255, 255, 255, -1.0!, -1.0!, 0.0!)
FillVertex(g_quads(6), 255, 0, 0, 255, -1.0!, 1.5!, 0.0!)
FillVertex(g_quads(7), 0, 255, 0, 255, -1.5!, 1.5!, 0.0!)
FillVertex(g_quads(8), 0, 0, 255, 255, 1.0!, -0.2!, 0.0!)
FillVertex(g_quads(9), 255, 255, 0, 255, 2.0!, -0.2!, 0.0!)
FillVertex(g_quads(10), 0, 255, 255, 255, 2.0!, 0.2!, 0.0!)
FillVertex(g_quads(11), 255, 0, 255, 255, 1.0!, 0.2!, 0.0!)
DIM g_quadStrip(7)
FillVertex(g_quadStrip(0), 255, 0, 0, 255, -0.5!, -1.5!, 0.0!)
FillVertex(g_quadStrip(1), 0, 255, 0, 255, 0.5!, -1.5!, 0.0!)
FillVertex(g_quadStrip(2), 0, 0, 255, 255, -0.2!, -0.5!, 0.0!)
FillVertex(g_quadStrip(3), 255, 255, 0, 255, 0.2!, -0.5!, 0.0!)
FillVertex(g_quadStrip(4), 255, 0, 255, 255, -0.5!, 0.5!, 0.0!)
FillVertex(g_quadStrip(5), 0, 255, 255, 255, 0.5!, 0.5!, 0.0!)
FillVertex(g_quadStrip(6), 255, 0, 0, 255, -0.4!, 1.5!, 0.0!)
FillVertex(g_quadStrip(7), 0, 255, 0, 255, 0.4!, 1.5!, 0.0!)
DIM g_polygon(4)
FillVertex(g_polygon(0), 255, 0, 0, 255, -0.3!, -1.5!, 0.0!)
FillVertex(g_polygon(1), 0, 255, 0, 255, 0.3!, -1.5!, 0.0!)
FillVertex(g_polygon(2), 0, 0, 255, 255, 0.5!, 0.5!, 0.0!)
FillVertex(g_polygon(3), 255, 255, 0, 255, 0.0!, 1.5!, 0.0!)
FillVertex(g_polygon(4), 255, 0, 255, 255, -0.5!, 0.5!, 0.0!)
glClearColor 0.0!, 0.0!, 0.0!, 0.0!
glCullFace %GL_BACK
glEnable %GL_CULL_FACE
END SUB
' =======================================================================================
' =======================================================================================
' Resize the scene
' =======================================================================================
SUB ResizeScene (BYVAL hwnd AS DWORD, BYVAL nWidth AS LONG, BYVAL nHeight AS LONG)
' Prevent divide by zero making height equal one
IF nHeight = 0 THEN nHeight = 1
' Reset the current viewport
glViewport 0, 0, nWidth, nHeight
' Select the projection matrix
glMatrixMode %GL_PROJECTION
' Reset the projection matrix
glLoadIdentity
' Calculate the aspect ratio of the window
gluPerspective 45.0!, nWidth / nHeight, 0.1!, 100.0!
' Select the model view matrix
glMatrixMode %GL_MODELVIEW
' Reset the model view matrix
glLoadIdentity
END SUB
' =======================================================================================
' =======================================================================================
' Draw the scene
' =======================================================================================
SUB DrawScene (BYVAL hwnd AS DWORD, BYVAL nWidth AS LONG, BYVAL nHeight AS LONG)
' Clear the screen buffer
glClear %GL_COLOR_BUFFER_BIT OR %GL_DEPTH_BUFFER_BIT
' Reset the view
glLoadIdentity
glTranslatef 0.0!, 0.0!, -5.0! ' Move into the screen 5.0
SELECT CASE g_currentPrimitive
CASE %GL_POINTS
glInterleavedArrays %GL_C4UB_V3F, 0, g_points(0)
glDrawArrays %GL_POINTS, 0, 5
CASE %GL_LINES
glInterleavedArrays %GL_C4UB_V3F, 0, g_lines(0)
glDrawArrays %GL_LINES, 0, 6
CASE %GL_LINE_STRIP
glInterleavedArrays %GL_C4UB_V3F, 0, g_lineStrip_and_lineLoop(0)
glDrawArrays %GL_LINE_STRIP, 0, 6
CASE %GL_LINE_LOOP
glInterleavedArrays %GL_C4UB_V3F, 0, g_lineStrip_and_lineLoop(0)
glDrawArrays %GL_LINE_LOOP, 0, 6
CASE %GL_TRIANGLES
glInterleavedArrays %GL_C4UB_V3F, 0, g_triangles(0)
glDrawArrays %GL_TRIANGLES, 0, 6
CASE %GL_TRIANGLE_STRIP
glInterleavedArrays %GL_C4UB_V3F, 0, g_triangleStrip(0)
glDrawArrays %GL_TRIANGLE_STRIP, 0, 8
CASE %GL_TRIANGLE_FAN
glInterleavedArrays %GL_C4UB_V3F, 0, g_triangleFan(0)
glDrawArrays %GL_TRIANGLE_FAN, 0, 6
CASE %GL_QUADS
glInterleavedArrays %GL_C4UB_V3F, 0, g_quads(0)
glDrawArrays %GL_QUADS, 0, 12
CASE %GL_QUAD_STRIP
glInterleavedArrays %GL_C4UB_V3F, 0, g_quadStrip(0)
glDrawArrays %GL_QUAD_STRIP, 0, 8
CASE %GL_POLYGON
glInterleavedArrays %GL_C4UB_V3F, 0, g_polygon(0)
glDrawArrays %GL_POLYGON, 0, 5
END SELECT
END SUB
' =======================================================================================
' =======================================================================================
' Processes keystrokes
' Parameters:
' * hwnd = Window hande
' * vKeyCode = Virtual key code
' * bKeyDown = %TRUE if key is pressed; %FALSE if it is released
' =======================================================================================
SUB ProcessKeystrokes (BYVAL hwnd AS DWORD, BYVAL vKeyCode AS LONG, BYVAL bKeyDown AS LONG)
STATIC bRenderInWireFrame AS LONG
SELECT CASE AS LONG vKeyCode
CASE %VK_ESCAPE
' Quit if Esc key pressed
SendMessage hwnd, %WM_CLOSE, 0, 0
CASE %VK_F1
IF ISTRUE bKeyDown THEN
IF g_currentPrimitive = %GL_POINTS THEN
g_currentPrimitive = %GL_LINES
ELSEIF g_currentPrimitive = %GL_LINES THEN
g_currentPrimitive = %GL_LINE_STRIP
ELSEIF g_currentPrimitive = %GL_LINE_STRIP THEN
g_currentPrimitive = %GL_LINE_LOOP
ELSEIF g_currentPrimitive = %GL_LINE_LOOP THEN
g_currentPrimitive = %GL_TRIANGLES
ELSEIF g_currentPrimitive = %GL_TRIANGLES THEN
g_currentPrimitive = %GL_TRIANGLE_STRIP
ELSEIF g_currentPrimitive = %GL_TRIANGLE_STRIP THEN
g_currentPrimitive = %GL_TRIANGLE_FAN
ELSEIF g_currentPrimitive = %GL_TRIANGLE_FAN THEN
g_currentPrimitive = %GL_QUADS
ELSEIF g_currentPrimitive = %GL_QUADS THEN
g_currentPrimitive = %GL_QUAD_STRIP
ELSEIF g_currentPrimitive = %GL_QUAD_STRIP THEN
g_currentPrimitive = %GL_POLYGON
ELSEIF g_currentPrimitive = %GL_POLYGON THEN
g_currentPrimitive = %GL_POINTS
END IF
END IF
CASE %VK_F2
IF ISTRUE bKeyDown THEN
bRenderInWireFrame = NOT bRenderInWireFrame
IF ISTRUE bRenderInWireFrame THEN
glPolygonMode %GL_FRONT, %GL_LINE
ELSE
glPolygonMode %GL_FRONT, %GL_FILL
END IF
END IF
END SELECT
END SUB
' =======================================================================================
' =======================================================================================
' Main
' =======================================================================================
FUNCTION WINMAIN (BYVAL hInstance AS DWORD, BYVAL hPrevInstance AS DWORD, BYVAL lpszCmdLine AS ASCIIZ PTR, BYVAL nCmdShow AS LONG) AS LONG
LOCAL hwnd AS DWORD
LOCAL wcex AS WNDCLASSEX
LOCAL szClassName AS ASCIIZ * 256
LOCAL szCaption AS ASCIIZ * 256
LOCAL msg AS tagMSG
LOCAL rc AS RECT
LOCAL bDone AS LONG
LOCAL nLeft AS LONG
LOCAL nTop AS LONG
LOCAL nWidth AS LONG
LOCAL nHeight AS LONG
LOCAL dwStyle AS DWORD
LOCAL dwStyleEx AS DWORD
STATIC vKeyCode AS LONG
STATIC bKeyDown AS LONG
LOCAL t AS DOUBLE
LOCAL t0 AS DOUBLE
LOCAL fps AS DOUBLE
LOCAL nFrames AS LONG
LOCAL dm AS DEVMODE
LOCAL bFullScreen AS LONG
LOCAL lResult AS LONG
' Register the window class
szClassName = "PBOPENGL"
wcex.cbSize = SIZEOF(wcex)
wcex.style = %CS_HREDRAW OR %CS_VREDRAW OR %CS_OWNDC
wcex.lpfnWndProc = CODEPTR(WndProc)
wcex.cbClsExtra = 0
wcex.cbWndExtra = 0
wcex.hInstance = hInstance
wcex.hCursor = LoadCursor (%NULL, BYVAL %IDC_ARROW)
wcex.hbrBackground = %NULL
wcex.lpszMenuName = %NULL
wcex.lpszClassName = VARPTR(szClassName)
wcex.hIcon = LoadIcon (%NULL, BYVAL %IDI_APPLICATION) ' Sample, if resource icon: LoadIcon(hInst, "APPICON")
wcex.hIconSm = LoadIcon (%NULL, BYVAL %IDI_APPLICATION) ' Remember to set small icon too..
RegisterClassEx wcex
' Ask the user which screen mode he prefers
lResult = MessageBox(%NULL, "Would you like to run in fullscreen mode?", _
"Start fullScreen?", %MB_YESNOCANCEL OR %MB_ICONQUESTION)
SELECT CASE lResult
CASE %IDCANCEL : EXIT FUNCTION
CASE %IDYES : bFullScreen = %TRUE
CASE %IDNO : bFullScreen = %FALSE
END SELECT
' Window size
nWidth = %GL_WINDOWWIDTH
nHeight = %GL_WINDOWHEIGHT
IF bFullScreen THEN
' Change display settings
dm.dmSize = SIZEOF(dm)
dm.dmPelsWidth = nWidth
dm.dmPelsHeight = nHeight
dm.dmBitsPerPel = %GL_BITSPERPEL
dm.dmFields = %DM_BITSPERPEL OR %DM_PELSWIDTH OR %DM_PELSHEIGHT
IF ChangeDisplaySettings(dm, %CDS_FULLSCREEN) = 0 THEN ShowCursor %FALSE
END IF
' Window caption
szCaption = $WindowCaption
' Window styles
IF ISFALSE bFullScreen THEN
dwStyle = %WS_OVERLAPPEDWINDOW
dwStyleEx = %WS_EX_APPWINDOW OR %WS_EX_WINDOWEDGE
ELSE
dwStyle = %WS_POPUP
dwStyleEx = %WS_EX_APPWINDOW
END IF
' Create the window
hwnd = CreateWindowEx( _
dwStyleEx, _ ' extended styles
szClassName, _ ' window class name
szCaption, _ ' window caption
dwStyle, _ ' window style
nLeft, _ ' initial x position
nTop, _ ' initial y position
nWidth, _ ' initial x size
nHeight, _ ' initial y size
%NULL, _ ' parent window handle
0, _ ' window menu handle
hInstance, _ ' program instance handle
BYVAL %NULL) ' creation parameters
' Retrieve the coordinates of the window's client area
GetClientRect hwnd, rc
' Initialize the new OpenGl window
SetupScene hwnd, rc.nRight - rc.nLeft, rc.nBottom - rc.nTop
' Show the window
ShowWindow hwnd, nCmdShow
UpdateWindow hwnd
DO UNTIL bDone
' Windows message pump
DO WHILE PeekMessage(msg, %NULL, 0, 0, %PM_REMOVE)
IF msg.message = %WM_QUIT THEN
bDone = %TRUE
ELSE
IF msg.message = %WM_KEYDOWN THEN
vKeyCode = msg.wParam
bKeyDown = %TRUE
ELSEIF msg.message = %WM_KEYUP THEN
vKeyCode = msg.wParam
bKeyDown = %FALSE
END IF
TranslateMessage msg
DispatchMessage msg
END IF
LOOP
IF ISFALSE bFullScreen THEN
' Get time and mouse position
t = INT(TIMER)
' Calculate and display FPS (frames per second)
IF t > t0 OR nFrames = 0 THEN
fps = nFrames \ (t - t0)
wsprintf szCaption, $WindowCaption & " (%i FPS)", BYVAL fps
SetWindowText hwnd, szCaption
t0 = t
nFrames = 0
END IF
nFrames = nFrames + 1
END IF
' Draw the scene
DrawScene hwnd, nWidth, nHeight
' Exchange the front and back buffers
SwapBuffers hDC
' Process the keystrokes
IF vKeyCode THEN
ProcessKeystrokes hwnd, vKeyCode, bKeyDown
vKeyCode = 0
END IF
LOOP
' Retore defaults
IF bFullScreen THEN
ChangeDisplaySettings BYVAL %NULL, 0
ShowCursor %TRUE
END IF
FUNCTION = msg.wParam
END FUNCTION
' =======================================================================================
' =======================================================================================
' Main window procedure
' =======================================================================================
FUNCTION WndProc (BYVAL hwnd AS DWORD, BYVAL wMsg AS DWORD, BYVAL wParam AS DWORD, BYVAL lParam AS LONG) AS LONG
LOCAL pf AS LONG
LOCAL pfd AS PIXELFORMATDESCRIPTOR
STATIC hRC AS LONG
SELECT CASE wMsg
CASE %WM_SYSCOMMAND
' Disable the Windows screensaver
IF (wParam AND &HFFF0) = %SC_SCREENSAVE THEN EXIT FUNCTION
' Close the window
IF (wParam AND &HFFF0) = %SC_CLOSE THEN
SendMessage hwnd, %WM_CLOSE, 0, 0
EXIT FUNCTION
END IF
CASE %WM_CREATE
' Retrieve the device context handle
hDC = GetDC(hwnd)
' Fill the PIXELFORMATDESCRIPTOR structure
pfd.nSize = SIZEOF(PIXELFORMATDESCRIPTOR) ' Size of the structure
pfd.nVersion = 1 ' Version number
pfd.dwFlags = %PFD_DRAW_TO_WINDOW _ ' Format must support window
OR %PFD_SUPPORT_OPENGL _ ' Format must support OpenGL
OR %PFD_DOUBLEBUFFER ' Format must support double buffering
pfd.iPixelType = %PFD_TYPE_RGBA ' Request an RGBA format
pfd.cColorBits = %GL_BITSPERPEL ' Number of color bitplanes in each color buffer
pfd.cRedBits = 0 ' Number of red bitplanes in each RGBA color buffer.
pfd.cRedShift = 0 ' Shift count for red bitplanes in each RGBA color buffer.
pfd.cGreenBits = 0 ' Number of green bitplanes in each RGBA color buffer.
pfd.cGreenShift = 0 ' Shift count for green bitplanes in each RGBA color buffer.
pfd.cBlueBits = 0 ' Number of blue bitplanes in each RGBA color buffer.
pfd.cBlueShift = 0 ' Shift count for blue bitplanes in each RGBA color buffer.
pfd.cAlphaBits = 0 ' Number of alpha bitplanes in each RGBA color buffer
pfd.cAlphaShift = 0 ' Shift count for alpha bitplanes in each RGBA color buffer.
pfd.cAccumBits = 0 ' Total number of bitplanes in the accumulation buffer.
pfd.cAccumRedBits = 0 ' Number of red bitplanes in the accumulation buffer.
pfd.cAccumGreenBits = 0 ' Number of gree bitplanes in the accumulation buffer.
pfd.cAccumBlueBits = 0 ' Number of blue bitplanes in the accumulation buffer.
pfd.cAccumAlphaBits = 0 ' Number of alpha bitplanes in the accumulation buffer.
pfd.cDepthBits = %GL_DEPTHBITS ' Depth of the depth (z-axis) buffer.
pfd.cStencilBits = 0 ' Depth of the stencil buffer.
pfd.cAuxBuffers = 0 ' Number of auxiliary buffers.
pfd.iLayerType = %PFD_MAIN_PLANE ' Ignored. Earlier implementations of OpenGL used this member, but it is no longer used.
pfd.bReserved = 0 ' Number of overlay and underlay planes.
pfd.dwLayerMask = 0 ' Ignored. Earlier implementations of OpenGL used this member, but it is no longer used.
pfd.dwVisibleMask = 0 ' Transparent color or index of an underlay plane.
pfd.dwDamageMask = 0 ' Ignored. Earlier implementations of OpenGL used this member, but it is no longer used.
' Find a matching pixel format
pf = ChoosePixelFormat(hDC, pfd)
IF ISFALSE pf THEN
MessageBox hwnd, "Can't find a suitable pixel format", _
"Error", %MB_OK OR %MB_ICONEXCLAMATION
SendMessage hwnd, %WM_CLOSE, 0, 0
EXIT FUNCTION
END IF
' Set the pixel format
IF ISFALSE SetPixelFormat(hDC, pf, pfd) THEN
MessageBox hwnd, "Can't set the pixel format", _
"Error", %MB_OK OR %MB_ICONEXCLAMATION
SendMessage hwnd, %WM_CLOSE, 0, 0
EXIT FUNCTION
END IF
' Create a new OpenGL rendering context
hRC = wglCreateContext(hDC)
IF ISFALSE hRC THEN
MessageBox hwnd, "Can't create an OpenGL rendering context", _
"Error", %MB_OK OR %MB_ICONEXCLAMATION
SendMessage hwnd, %WM_CLOSE, 0, 0
EXIT FUNCTION
END IF
' Make it current
IF ISFALSE wglMakeCurrent(hDC,hRC) THEN
MessageBox hwnd, "Can't activate the OpenGL rendering context", _
"Error", %MB_OK OR %MB_ICONEXCLAMATION
SendMessage hwnd, %WM_CLOSE, 0, 0
EXIT FUNCTION
END IF
EXIT FUNCTION
CASE %WM_DESTROY
' Release the device and rendering contexts
wglMakeCurrent hDC, 0
' Make the rendering context no longer current
wglDeleteContext hRC
' Release the device context
ReleaseDC hwnd, hDC
' Post a WM_QUIT message
PostQuitMessage 0
EXIT FUNCTION
CASE %WM_SIZE
ResizeScene hwnd, LO(WORD, lParam), HI(WORD, lParam)
EXIT FUNCTION
END SELECT
' Call the default window procedure to process unhandled messages
FUNCTION = DefWindowProc(hwnd, wMsg, wParam, lParam)
END FUNCTION
' =======================================================================================
