Shulou(Shulou.com)06/03 Report--

In this issue, the editor will bring you what are the OpenGL library functions. The article is rich in content and analyzes and describes for you from a professional point of view. I hope you can get something after reading this article.

The API related to OpenGL function library include core library (gl), practical library (glu), auxiliary library (aux), utility library (glut), window library (glx, agl, wgl) and extension function library. As can be seen from the figure, gl is the core, and glu is a partial encapsulation of gl. Glx, agl, and wgl are functions for different window systems. Glut is a tool kit for cross-platform OpenGL programs, which is more powerful than aux. The extension function library is a function developed by hardware manufacturers using the extension mechanism of OpenGL for hardware update.

At present, the functions of OpenGL are mainly contained in three libraries: GL function library, GLU function library and GLUT function library.

GL library function

Color editing

GlShadeModel,glColor,glColorPointer,glIndex,glIndexPointer,glColorTableEXT,glColorSubTableEXT

Draw geometry

GlVertex,glVertexPointer,glArrayElement,glBegin, glEnd,glEdgeFlag, glEdgeFlagv,glPointSize,glLineWidth,glLineStipple,glPolygonMode,glFrontFace,glPolygonStipple,glDrawElements,glRect

Coordinate transformation

GlTranslate,glRotate,glScale,glViewPoint,glFrustum,glOrtho,glClipPlane

Stack operation

GlLoadMatrix,glMultMatrix,glMatrixMode,glPushMatrix, glPopMatrix,glPushAttrib, glPopAttrib,glPushName, glPopName,glInitName, glLoadName

Display list

GlNewList, glEndList,glCallList,glCallLists,glGenLists,glDeleteLists

GlIsList

Use lighting and material

GlNormal,glNormalPointer,glLight,glLightModel,glMaterial,glColorMaterial

Pixel operation

GlRasterPos,glBitmap,glReadPixels,glDrawPixels,glCopyPixels,glCopyTexImage1D,glCopyTexImage2D,glCopyTexSubImage1D,glCopyTexSubImage2D,glPixelZoom,glPixelStore,glPixelTransfer,glPixelMap

Texture mapping

GlTexImage1D,glTexImage2D,glTexParameter,glTexSubImage1D,glTexSubImage2D,glTexEnv,glTexCoord,glTexGen,glTexCoordPointer,glDeleteTextures

Special effect operation

GlBlendFunc,glHint,glFog

Frame cache operation

GlClear,glClearAccum,glClearColor,glClearDepth,glClearIndex,glClearStencil,glDrawBuffer,glIndexMask,glColorMask,glDepthMask,glStencilMask,glAlphaFunc,glStencilFunc,glStencilOp,glDepthFunc,glDepthRange,glLogicOp,glAccum

Curve or surface drawing

GlEvalCoord,glMap1,glMap2,glMapGrid,glEvalMesh,glEvalPoint

Query function

GlGet,glGetClipPlane,glGetColorTableEXT,glGetColorTableParameterfvEXT, glGetColorTableParameterivEXT,glGetError,glGetLight,glGetMap,glGetMaterial,glGetPixelMap,glGetPointerv,glGetPolygonStipple,glGetString,glGetTexEnv,glGetTexImage,glGetTexLevelParameter,glGetTexParameter

The GLU library function contains 43 functions with the function name prefixed with glu. OpenGL provides powerful but few drawing commands, and all more complex drawings must start with points, lines, and faces. In order to reduce the heavy programming work, Glu encapsulates the OpenGL function. By calling the functions of the core library, the Glu function provides developers with a relatively simple usage and implements some more complex operations. Glu.dll is responsible for interpreting and executing this function. The core and practical libraries in OpenGL can run on all OpenGL platforms.

Draw NURBS curves and surfaces

GluNewNurbsRenderer,gluNurbsProperty,gluNurbsCallback,gluBeginCurve, gluEndCurve,gluNurbsCurve,gluDeleteNurbsRenderer,gluBeginSurface, gluEndSurface,gluNurbsSurface,gluBeginTrim, gluEndTrim,gluPwlCurve,gluBeginPolygon, gluEndPolygon,gluPickMatrix

Draw quadratic geometric objects

GluNewQuadric,gluQuadricDrawStyle,gluQuadricNormals,gluQuadricOrientation,gluCylinder,gluSphere,gluDisk,gluPartialDisk,gluDeleteQuadric,gluQuadricTexture,gluQuadricCallback

Gridding

GluNewTess,gluTessVertex,gluTessCallback,gluTessBeginPolygon, gluTessEndPolygon,gluTessBeginContour, gluTessBeginContour,gluTessProperty,gluNextContour,gluTessNormal,gluDeleteTess

Coordinate transformation

GluOrtho2D,gluPerspective,gluLookAt,gluProject,gluUnProject

Multiple mapping

GluBuild1DMipmaps,gluBuild2DMipmaps,gluScaleImage

Query function

GluErrorString,gluGetNurbsProperty,gluGetString,gluGetTessProperty

The GLUT library function contains about 30 functions with the function name prefixed with glut. Glut is an OpenGL toolkit independent of window platforms, written by Mark KLilgrad in SGI (now in Nvidia), to hide the complexity of different window platforms API. The functions begin with glut, and they provide more complex drawing functions as a more powerful alternative to the aux library, which is interpreted and executed by glut.dll. Because the window management function in glut does not depend on the running environment, the tool library in OpenGL can run under X-Window, Windows NT, OS/2 and other systems, which is especially suitable for developing OpenGL sample programs that do not need complex interfaces. For experienced programmers, it is common to use glut to straighten out 3D graphics code before integrating it into a complete application.

Initialize and start event handling

GlutInit,glutInitWindowPosition,glutInitWindowSize,glutInitDisplayMode,glutMainLoop

Window management

GlutCreateWindow,glutCreateSubWindow,glutHideWindow,glutShowWindow,glutSetWindowTitle,glutPostRedisplay,glutSwapBuffers,glutFullScreen,glutPositionWindow,glutReshapeWindow,glutSetWindow,glutGetWindow,glutPopWindow,glutPushWindow,glutDestroyWindow,glutIconifyWindow,glutSetCursor

Overlapping layer management

GlutEstablishOverlay,glutUseLayer,glutRemoveOverlay,glutPostOverlayRedisplay,glutShowOverlay,glutHideOverlay

Menu management

GlutCreateMenu,glutAddMenuEntry,glutAddSubMenu,glutAttachMenu,glutGetMenu,glutSetMenu,glutDestroyMenu,glutChangeToMenuEntry,glutChangeToSubMenu,glutRemoveMenuItem,glutDetachMenu

Register callback function

GlutDisplayFunc,glutReshapeFunc,glutMouseFunc,glutMotionFunc,glutIdleFunc,glutVisibilityFunc,glutKeyboardFunc,glutSpecialFunc,glutOverlayDisplayFunc,glutPassiveMotionFunc,glutEntryFunc,glutSpaceballMotionFunc,glutSpaceballRotateFunc,glutSpaceballButtonFunc,glutButtonBoxFunc,glutDialsFunc,glutTableMotionFunc,glutTableButtonFunc,glutMenuStatusFunc,glutTimerFunc

Color index mapping table management

GlutSetColor,glutGetColor,glutCopyColormap

Status retrieval

GlutGet,glutLayerGet,glutDeviceGet,glutGetModifiers,glutExtensionSupported

Font drawing

GlutBitmapCharacter,glutBitmapWidth,glutStrokeCharacter,glutStrokeWidth

Geometric drawing

GlutSolidSphere, glutWireSphere,glutSolidCube, glutWireCube,glutSolidCone, glutWireCone,glutSolidTorus, glutWireTorus,glutSolidDodecahedron, glutWireDodecahedron,glutSolidOctahedron, glutWireOctahedron,glutSolidTetrahedron, glutWireTetrahedron,glutSolieIcosahedron, glutWireIcosahedron,glutSolidTeapot, glutWireTeapot

These are the OpenGL library functions that Xiaobian shares with you. If you happen to have similar doubts, you might as well refer to the above analysis to understand. If you want to know more about it, you are welcome to follow the industry information channel.

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