??? ??? RGBA ????? ??

1
? ? ? ? ?
2
??? ??

• ????? ??
• ???? ???
• ???
• ??? ????
• ??? ???
• ??? ??? ??
• ??? ?? ???? ????
• ??? ??

3
??? ??? ??

• ??? ????? ???, ????? ?? ???? ??
• ???? ??? ??? ??? ???? ??? ??
• ??? ??? ???
• ???? ???? ??? ??? ??? ???.
• ??? ??? RGBA ????? ??

4
??

• ??? ???(??, ??, ??? ?? ???)?? ??? ??
• ??(texel) ??? ?? ??? ?? ????? ?
• ?????(tessellation) ???? ? ???? ???? ???? ????
  ??? ??? ??? ??? ????? ??
• ?? ???? ?????? ??? ????? ?? ????? ???? ???? ????
  ?? ??? ???? ???? ??? ???? ???? ??? ?? ??

5
??? ??? ??

• (1) ??? ????? ???, ????? ?? ??? ????
• ???? ???? ?? 2???? ?? ??? 1??? ? ? ??, 3??? ? ?
  ??.
• ???? ???? ???? ? ?, ? ?, ? ?, ?? ? ?? ? ??? ??
  ???? ??
• R, G, B, A ? 4? ???? ??? ?? ??
• ?? 9-1
• ??? ??? ????? ??? ???? ???? ?? ??

6

• (2) ???? ? ??? ???? ?? ????
• ????? ??? ??? ?????? ??? RGBA?? ??? ? 4?? ?? ??
• ??? ??? ??? ?? ??? ???? ??(????)?
• ???? ????? ??? ??? ???? ???? ??? ??.
• ???? ????? ??? ? ??

7

• (3) ??? ??? ???
• ??? ??? ?? ???? ???? ??
• GL_TEXTURE_1D,GL_TEXTURE_2D,GL_TEXTURE_3D ???
  ???? ??? ??? ???? ? ? ??
• (4) ???? ???? ??? ??? ?? ???
• ???? ??? ????? ?????? ?????? ??
• ? ??? ????? ????? ??? ??? ???? ??? ???? ?

8
?? 9-1 ??? ?? ??? ??? checker.c

• include ltGL/glut.hgt
• include ltstdlib.hgt
• include ltstdio.hgt
• / Create checkerboard texture /
• define checkImageWidth 64
• define checkImageHeight 64
• static GLubyte checkImagecheckImageHeightcheckI
  mageWidth4
• ifdef GL_VERSION_1_1
• static GLuint texName
• endif

9

• void makeCheckImage(void)
• int i, j, c
• for (i 0 i lt checkImageHeight i)
• for (j 0 j lt checkImageWidth j)
• c ((((i0x8)0)((j0x8))0))255
• checkImageij0 (GLubyte) c
• checkImageij1 (GLubyte) c
• checkImageij2 (GLubyte) c
• checkImageij3 (GLubyte) 255

10

• void init(void)
• glClearColor (0.0, 0.0, 0.0, 0.0)
• glShadeModel(GL_FLAT)
• glEnable(GL_DEPTH_TEST)
• makeCheckImage()
• glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
• ifdef GL_VERSION_1_1
• glGenTextures(1, texName)
• glBindTexture(GL_TEXTURE_2D, texName)
• endif

11

• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_WRAP_S, GL_REPEAT)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_WRAP_T, GL_REPEAT)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_MAG_FILTER, GL_NEAREST)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_MIN_FILTER, GL_NEAREST)
• ifdef GL_VERSION_1_1
• glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
  checkImageWidth, checkImageHeight,
• 0, GL_RGBA, GL_UNSIGNED_BYTE,
  checkImage)
• else
• glTexImage2D(GL_TEXTURE_2D, 0, 4,
  checkImageWidth, checkImageHeight,
• 0, GL_RGBA, GL_UNSIGNED_BYTE,
  checkImage)
• endif

12

• void display(void)
• glClear(GL_COLOR_BUFFER_BIT
  GL_DEPTH_BUFFER_BIT)
• glEnable(GL_TEXTURE_2D)
• glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE,
  GL_DECAL)
• ifdef GL_VERSION_1_1
• glBindTexture(GL_TEXTURE_2D, texName)
• endif
• glBegin(GL_QUADS)
• glTexCoord2f(0.0, 0.0) glVertex3f(-2.0, -1.0,
  0.0)
• glTexCoord2f(0.0, 1.0) glVertex3f(-2.0, 1.0,
  0.0)
• glTexCoord2f(1.0, 1.0) glVertex3f(0.0, 1.0,
  0.0)
• glTexCoord2f(1.0, 0.0) glVertex3f(0.0, -1.0,
  0.0)

13

• glTexCoord2f(0.0, 0.0) glVertex3f(1.0, -1.0,
  0.0)
• glTexCoord2f(0.0, 1.0) glVertex3f(1.0, 1.0,
  0.0)
• glTexCoord2f(1.0, 1.0) glVertex3f(2.41421,
  1.0, -1.41421)
• glTexCoord2f(1.0, 0.0) glVertex3f(2.41421,
  -1.0, -1.41421)
• glEnd()
• glFlush()
• glDisable(GL_TEXTURE_2D)
• void reshape(int w, int h)
• glViewport(0, 0, (GLsizei) w, (GLsizei) h)
• glMatrixMode(GL_PROJECTION)
• glLoadIdentity()

14

• gluPerspective(60.0, (GLfloat) w/(GLfloat) h,
  1.0, 30.0)
• glMatrixMode(GL_MODELVIEW)
• glLoadIdentity()
• glTranslatef(0.0, 0.0, -3.6)
• void keyboard (unsigned char key, int x, int y)
• switch (key)
• case 27
• exit(0)
• break
• default
• break

15

• int main(int argc, char argv)
• glutInit(argc, argv)
• glutInitDisplayMode(GLUT_SINGLE GLUT_RGB
  GLUT_DEPTH)
• glutInitWindowSize(250, 250)
• glutInitWindowPosition(100, 100)
• glutCreateWindow(argv0)
• init()
• glutDisplayFunc(display)
• glutReshapeFunc(reshape)
• glutKeyboardFunc(keyboard)
• glutMainLoop()
• return 0

16
(No Transcript)
17
?? ???? ?? checker.c

• ???? makeCheckImage() ? ????
• init()?? ????? ???
• glGenTextures()? glBindTexture()? ??? ??? ???
  ???.
• glTexImage2D()? ?? ??? ?? ??? ?? ????. ??? ??,
  ??, ??, ??? ??? ??? ???.
• glTexParameter()? ???? ??? ??????, ???? ??
  ????? ??? ?? ?? ??? ??? ???? ???
• display()?? glEnable()? ?? ???? ??
• glTexEnv()? GL_REPLACE ? ??? ?? ??
• ??? ???? ?? ?? GL_DECAL, GL_REPLACE,
  GL_MODULATE, GL_BLEND
• glTexCoord()? ???? ??? ??? ??

18
???? ???

• glTextImage2D()? 2?? ??? ???? ??
• 1?? glTextImage1D(), 3?? glTextImage3D()
• void glTextImage2D(GLenum target, GLint level,
  GLint internalFormat, GLsizei width, GLsizei
  height, GLint border, GLenum format, GLenum type,
  const GLvoid texels)
• target ??? GL_TEXTURE_2D, GL_PROXY_TEXTURE_2D? ??
• (??) ??????? OpenGL ????? ?? ?????? ?? ?? ??? ???
  ???? ???? ??? ? ??? ?.
• level ??? ??? ??. ???? ??? ??(??? ???? ?? ??)
  level? 0
• internalFormat ??? ??? ???? R, G, B, A ????? ??
  ????? ???. 1?? 4? ?. ?? 38?? ????? ???
• GL_ALPHA, GL_ALPHA4, GL_LUMINANCE4, GL_RGB4 ?
• width, height ? ??? ???? ??(?? ??) ??. ?? 64x64.
  2m2b (m? ??? ?? ?, b? border ?)??? ??? ?.

19

• border? 0(???? ??)?? 1(??? ??)?? ???? ?? ???.
• format, type ??? ??? ???? ??? ??? ??? ???
• format GL_COLOR_INDEX, GL_RGB, GL_GREEN,
  GL_BLUE, GL_ALPHA,
• type GL_BYTE, GL_UNSIGNED_BYTE, GL_SHORT,
• texels ??? ??? ???

20

• ???? ???? ?? ???? ??? ??? ?? ?? ???? 2? ????? ?.
  ? ??? ?? ??? ????gluScaleImage() ???? ???? ???
  ????
• Int gluScaleImage(GLenum format, GLint widthin,
  GLint heightin, GLenum typein, const void
  datain, GLint widthout, GLint heightout, GLenum
  typeout, void dataout)
• datain?? ?? ???? ?? ?? ??? ?? ????? ??, ???? ???
• ?? ???? GL_PACK ????? ???? dataout? ???.

21

• glCopyTexImage2D()? ???????? ?? ???? read, ? ????
  ??? ???? ???? ??
• void glCopyTexImage2D(GLenum target, GLint level,
  GLint internalFormat, GLint x, GLint y, GLsizei
  width, GLsizei height, GLint border)
• ???? ???? ?? ??? ?? ???? ???? 2?? ???? ??.
• target ??? ?? GL_TEXTURE_2D? ????? ?
• ??? ??? ??? ?? (x, y) ??? ?? ?? ????? ???? ????
• width/height ? ??? ???? ??, ? ? 2m2b ? ??
• m? ?? ?? ??, b? border ?

22
??? ???

• OpenGL ?? ??? ?? ??? ??? ?? ?? ??? ??? ???? ????
  ??? ? ??? ??? ??? ???(proxy) ??
• OpenGL? ??? ?? ??? ??? ?? GL_PROXY_TEXTURE_2D ?
  target ??? ??? level, internalFormat, width,
  height, border, format, type? ??? glTexImage2D()?
  ??
• ???? ?? ?? ??? ?? ????? NULL?? ??? ?
• ???? ???? ??? ???? ??? ???? ?? ??? ???? ??? ??
  glGetTexLevelParameter()? ??, ??? ????? ??
• void glGetTextLevelParameterifv(GLenum target,
  GLint level, GLenum pname, TYPE params)

23
?? 9-2 ??? ???

• ??? ???? ??? ??? ????
• GLInt width
• glTexImage2D(GL_PROXY_TEXTURE_2D, 0, GL_RGBA8,
  64, 64, 0,GL_RGBA, GL_UNSIGNED_BYTE, NULL)
• glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D,
  0, GL_TEXTURE_WIDTH, width)

24

• ??? ???? ?? ?? ?? ???
• ?? ???? 2?? ??? ???? ???? ?? ??(subregion)? ?? ??
  ???? ???? 2?? ??? ??? ??
• void glTexSubImage2D(GLenum target, GLint level,
  GLint xoffset, GLint yoffset, GLsizei width,
  GLsizei height, GLenum format, GLenum type, const
  GLvoid texels)
• target ??? GL_TEXTURE_2D? ??
• level ?? LOD(level-of-detail)
• width/height ?? ??? ???? ?? ?? ??? ???? ?? ???
  ??
• xoffset/yoffset x-, y- ??? ?? ???. ?? ???? ????
  ??

25
??9-3 ??? ?? ??? ?? texsub.c

• include ltGL/glut.hgt
• include ltstdlib.hgt
• include ltstdio.hgt
• ifdef GL_VERSION_1_1
• define checkImageWidth 64
• define checkImageHeight 64
• define subImageWidth 16
• define subImageHeight 16
• static GLubyte checkImagecheckImageHeightcheckI
  mageWidth4
• static GLubyte subImagesubImageHeightsubImageWi
  dth4
• static GLuint texName

26

• void makeCheckImages(void)
• int i, j, c
• for (i 0 i lt checkImageHeight i)
• for (j 0 j lt checkImageWidth j)
• c (((i0x8)0)((j0x8)0))255 //??
• checkImageij0 (GLubyte) c
• checkImageij1 (GLubyte) c
• checkImageij2 (GLubyte) c
• checkImageij3 (GLubyte) 255

27

• for (i 0 i lt subImageHeight i)
• for (j 0 j lt subImageWidth j)
• c (((i0x4)0)((j0x4)0))255 //??
• subImageij0 (GLubyte) c
• subImageij1 (GLubyte) 0
• subImageij2 (GLubyte) 0
• subImageij3 (GLubyte) 255
• void init(void)
• glClearColor (0.0, 0.0, 0.0, 0.0)
• glShadeModel(GL_FLAT)
• glEnable(GL_DEPTH_TEST)

28

• makeCheckImages()
• glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
• glGenTextures(1, texName)
• glBindTexture(GL_TEXTURE_2D, texName)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_WRAP_S, GL_REPEAT)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_WRAP_T, GL_REPEAT)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_MAG_FILTER, GL_NEAREST)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_MIN_FILTER, GL_NEAREST)
• glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
  checkImageWidth, checkImageHeight, 0, GL_RGBA,
  GL_UNSIGNED_BYTE, checkImage)

29

• void display(void)
• glClear(GL_COLOR_BUFFER_BIT
  GL_DEPTH_BUFFER_BIT)
• glEnable(GL_TEXTURE_2D)
• glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE,
  GL_DECAL)
• glBindTexture(GL_TEXTURE_2D, texName)
• glBegin(GL_QUADS)
• glTexCoord2f(0.0, 0.0) glVertex3f(-2.0, -1.0,
  0.0)
• glTexCoord2f(0.0, 1.0) glVertex3f(-2.0, 1.0,
  0.0)
• glTexCoord2f(1.0, 1.0) glVertex3f(0.0, 1.0,
  0.0)
• glTexCoord2f(1.0, 0.0) glVertex3f(0.0, -1.0,
  0.0)

30

• glTexCoord2f(0.0, 0.0) glVertex3f(1.0, -1.0,
  0.0)
• glTexCoord2f(0.0, 1.0) glVertex3f(1.0, 1.0,
  0.0)
• glTexCoord2f(1.0, 1.0) glVertex3f(2.41421,
  1.0, -1.41421)
• glTexCoord2f(1.0, 0.0) glVertex3f(2.41421,
  -1.0, -1.41421)
• glEnd()
• glFlush()
• glDisable(GL_TEXTURE_2D)
• void reshape(int w, int h)
• glViewport(0, 0, (GLsizei) w, (GLsizei) h)
• glMatrixMode(GL_PROJECTION)
• glLoadIdentity()

31

• gluPerspective(60.0, (GLfloat) w/(GLfloat) h,
  1.0, 30.0)
• glMatrixMode(GL_MODELVIEW)
• glLoadIdentity()
• glTranslatef(0.0, 0.0, -3.6)
• void keyboard (unsigned char key, int x, int y)
• switch (key)
• case 's'
• case 'S'
• glBindTexture(GL_TEXTURE_2D, texName)
• glTexSubImage2D(GL_TEXTURE_2D, 0, 12,
  44, subImageWidth,
• subImageHeight, GL_RGBA,
• GL_UNSIGNED_BYTE,
  subImage)
• glutPostRedisplay()
• break

32

• case 'r'
• case 'R'
• glBindTexture(GL_TEXTURE_2D, texName)
• glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
  checkImageWidth,
• checkImageHeight, 0,
  GL_RGBA,
• GL_UNSIGNED_BYTE,
  checkImage)
• glutPostRedisplay()
• break
• case 27
• exit(0)
• break
• default
• break

33

• int main(int argc, char argv)
• glutInit(argc, argv)
• glutInitDisplayMode(GLUT_SINGLE GLUT_RGB
  GLUT_DEPTH)
• glutInitWindowSize(250, 250)
• glutInitWindowPosition(100, 100)
• glutCreateWindow(argv0)
• init()
• glutDisplayFunc(display)
• glutReshapeFunc(reshape)
• glutKeyboardFunc(keyboard)
• glutMainLoop()
• return 0

34

• else
• int main(int argc, char argv)
• fprintf (stderr, "This program demonstrates a
  feature which is not in OpenGL Version 1.0.\n")
• fprintf (stderr, "If your implementation of
  OpenGL Version 1.0 has the right extensions,\n")
• fprintf (stderr, "you may be able to modify
  this program to make it run.\n")
• return 0
• endif

35
????
36

• glCopyTexSubImage2D()? ?????? ?? ??? ???? ??,
  ???? ??? ??? ??? ??
• void glCopyTexSubImage2D(GLenum target, GLint
  level, GLint xoffset, GLint yoffset, GLint x,
  GLint y,GLsizei width, GLsizei height)
• ???? 2?? ??? ???? ???? ?? ??? ?? ?? ??? ???? ??
  ??? ??? ??? ?? ??
• target ??? GL_TEXTURE_2D? ??
• level? ????? ?? ??, xoffset,yoffset? x,y??? ??
  offset? ??

37
1?? ???

• ??? 1?? ???? ??? ?? glTexImage1D() ??
• ? ???? ???? ??? ? ??? ?? ? ??? 1?? ???? ?? ??
  ???? ?? 1?? ??? ??
• void glTexImage1D(GLenum target, GLint level,
  GLint internalFormat, GLsizei width, GLint
  border, GLenum format, GLenum type, const GLvoid
  texels)
• texels? 1?? ??, width ?? 2m (?? ??? ??? 2m 2)

38

• 1?? ???? ?? ?? ?? ??? ???? ??? glTexSubImage1D()?
  ??
• void glTexSubImage1D(GLenum target, GLint level,
  GLint xoffset, GLsizei width, GLenum format,
  GLenum type,const GLvoid texels)
• ???? 1?? ??? ???? ???? ?? ??? ?? ?? ??? ???? 1??
  ??? ??? ??
• level, format, type ??? glTexImage1D()?? ???? ??
  ??

39

• ?????? ??? 1?? ???? ??? ??? 1?? ??? ????? ????
  ??? glCopyTexImage1D()? glCopyTexSubImage1()? ??
• void glCopyTexImage1D(GLenum target, GLint level,
  GLint internalFormat, GLint x, GLint y, GLsizei
  width,GLint border)
• ??? ???? ??? ????? ??? ??, 1?? ???? ???.
• target? GL_TEXTURE_1D??? ????? ?
• width ? ?? ?? ??? ? ??. ?? 2m(??? ?? ??? 2m2)

40

• void glCopyTexSubImage1D(GLenum target, GLint
  level, GLint xoffset, GLint x, GLint y, GLsizei
  width)
• ???? 1?? ??? ???? ???? ???? ?? ?? ??? ???? ??
  ?????? ??? ??? ??
• target ??? GL_TEXTURE_1D? ??
• level ?? ??? ?? ??
• xoffset ?? offset ??

41
3?? ??? ? ?? ??

• 3?? ???? ??, ????? ??????? ??? ?? ???
• ??? ???? ????(CT), ???? ???(MRI)???? ????? ??
• ?? ??? ? ???
• 3?? ??? ???? 2?? ?? ??? ??? ??? ??
• ????? ???? ??? ??
• 3?? ???? ??? ?? glTexImage3D()??

42

• void glTexImage3D(GLenum target, GLint level,
  GLint internalFormat, GLsizei width, GLsizei
  height, GLsizei depth, GLint border, GLenum
  format, GLenum type, const GLvoid texels)
• 3?? ??? ??
• ?? ??? glTexImage2D() ? ?? ??? ???? ??? 3?? ????
  depth ??? ??. Depth ?? 2m(???? ?? ??? 2m1)
• ???? ??? ???? ??? ? ???, ??? ??? ??? ??

43

• 3?? ???? ?? ?? ??? ????? glTexSubImage3D()? ??
• void glTexSubImage3D(GLenum target, GLint level,
  GLint xoffset, GLint yoffset, GLint zoffset,
  GLsizei width, GLsizei height, GLsizei depth,
  GLenum format, GLenum type, const GLvoid
  texels)
• ???? 3?? ??? ???? ???? 3?? ??? ??? ??
• target ??? GL_TEXTURE_3D? ?? ?
• level, format, type glTexImage3D() ?? ??? ??
  ??.

44

• 3?? ???? ??? ???? ???? ?????? ???? ??
  glCopyTexSubImage3D()? ??
• void glCopyTexSubImage3D(GLenum target, GLint
  level, GLint xoffset, GLint yoffset, GLint
  zoffset, GLsizei width, GLsizei height)
• ???? 3?? ??? ???? ???? ?? ??? ???? ??, ??? ???
  ??? ??? ??
• target ??? GL_TEXTURE_3D ??

45
3?? ???? ?? ?? ??

• ?? ???? ? ?? ?? ??? ??
• glPixelStore()? ???? ?? ??? ?? ???? ?? ???? ???
  ???? ????? ???? ?? ????? ???
• ROW_LENGTH, ALIGNMENT, SKIP_PIXELS,
  SKIP_ROWS(? GL_UNPACK_ ?? GL_PACK_ ??)
• 3?? ??? ??? ??? ?? ??? ???? ??? ??? ?? ?? ??? ??
• IMAGE_HEIGHT,SKIP_IMAGES ?
• ??? ???? ?? ??? ??? ??? ???? ?? glTexImage3D(),
  glSubImage3D(), glGetTexImage() ??? ??

46

• ?? ???? ?? 3?? ???? ??? ?? ???? ??? ????
  IMAGE_HEIGHT??? ???? ??? ?? ??? ??? ??
• ?? ??? ??? ??? ???? ???? SKIP_IMAGES ????? ??

47
IMAGE_HEIGHT ?? ?? ??
Subimage In layer 1
ROW_LENGTH
IMAGE_ HEIGHT
Subimage In layer 0
Height
SKIP_PIXELS
layer1
SKIP_ROWS
layer0
48
?? ??? ?? ??

• ??? ????? ???? ??? ???? ?? ??? ??? ??? ????? ???
  ????? ??. ??? ?? ?????? ??? ??? ??? ????? ?. gt
  ?? ??(?? ??? ??? ?? ?? ??)
• ???? ??? ? OpenGL? ????? ??? ????? ??? ??? ????
  ??? ??
• ???? ???? ???? ?? ??? ?? ? ??? 1 1 ??? ??? 2?
  ????? ??? ? ?? ???? ??? ??? ?
• ???? ?? ??? ?? 64x16 ???, ???? 32x8, 16x4, 8x2,
  4x1, 2x1, 1x1 ??? ?? ????? ?
• ? ????? ???? ?? ??? ?? ??? ???? ? level, width,
  height,image ?????? ?? ?? ??? ?? glTexImage2D()?
  ?? ??

49
??9-5 ?? ??? mipmap.c

• include ltGL/glut.hgt
• include ltstdlib.hgt
• GLubyte mipmapImage3232324
• GLubyte mipmapImage1616164
• GLubyte mipmapImage8884
• GLubyte mipmapImage4444
• GLubyte mipmapImage2224
• GLubyte mipmapImage1114
• ifdef GL_VERSION_1_1
• static GLuint texName
• endif

50

• void makeImages(void)
• int i, j
• for (i 0 i lt 32 i)
• for (j 0 j lt 32 j)
• mipmapImage32ij0 255
• mipmapImage32ij1 255
• mipmapImage32ij2 0
• mipmapImage32ij3 255

51

• for (i 0 i lt 16 i)
• for (j 0 j lt 16 j)
• mipmapImage16ij0 255
• mipmapImage16ij1 0
• mipmapImage16ij2 255
• mipmapImage16ij3 255
• for (i 0 i lt 8 i)
• for (j 0 j lt 8 j)
• mipmapImage8ij0 255
• mipmapImage8ij1 0
• mipmapImage8ij2 0
• mipmapImage8ij3 255

52

• for (i 0 i lt 4 i)
• for (j 0 j lt 4 j)
• mipmapImage4ij0 0
• mipmapImage4ij1 255
• mipmapImage4ij2 0
• mipmapImage4ij3 255
• for (i 0 i lt 2 i)
• for (j 0 j lt 2 j)
• mipmapImage2ij0 0
• mipmapImage2ij1 0
• mipmapImage2ij2 255
• mipmapImage2ij3 255

53

• mipmapImage1000 255
• mipmapImage1001 255
• mipmapImage1002 255
• mipmapImage1003 255
• void init(void)
• glEnable(GL_DEPTH_TEST)
• glShadeModel(GL_FLAT)
• glTranslatef(0.0, 0.0, -3.6)
• makeImages()
• glPixelStorei(GL_UNPACK_ALIGNMENT, 1)

54

• ifdef GL_VERSION_1_1
• glGenTextures(1, texName)
• glBindTexture(GL_TEXTURE_2D, texName)
• endif
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_WRAP_S, GL_REPEAT)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_WRAP_T, GL_REPEAT)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_MAG_FILTER, GL_NEAREST)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_MIN_FILTER,
• GL_NEAREST_MIPMAP_NEAREST)
• glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, 32,
  32, 0,
• GL_RGBA, GL_UNSIGNED_BYTE,
  mipmapImage32)

55

• glTexImage2D(GL_TEXTURE_2D, 1, GL_RGBA, 16,
  16, 0,
• GL_RGBA, GL_UNSIGNED_BYTE,
  mipmapImage16)
• glTexImage2D(GL_TEXTURE_2D, 2, GL_RGBA, 8, 8,
  0,
• GL_RGBA, GL_UNSIGNED_BYTE,
  mipmapImage8)
• glTexImage2D(GL_TEXTURE_2D, 3, GL_RGBA, 4, 4,
  0,
• GL_RGBA, GL_UNSIGNED_BYTE,
  mipmapImage4)
• glTexImage2D(GL_TEXTURE_2D, 4, GL_RGBA, 2, 2,
  0,
• GL_RGBA, GL_UNSIGNED_BYTE,
  mipmapImage2)
• glTexImage2D(GL_TEXTURE_2D, 5, GL_RGBA, 1, 1,
  0,
• GL_RGBA, GL_UNSIGNED_BYTE,
  mipmapImage1)
• glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE,
  GL_DECAL)
• glEnable(GL_TEXTURE_2D)

56

• void display(void)
• glClear(GL_COLOR_BUFFER_BIT
  GL_DEPTH_BUFFER_BIT)
• ifdef GL_VERSION_1_1
• glBindTexture(GL_TEXTURE_2D, texName)
• endif
• glBegin(GL_QUADS)
• glTexCoord2f(0.0, 0.0) glVertex3f(-2.0, -1.0,
  0.0)
• glTexCoord2f(0.0, 8.0) glVertex3f(-2.0, 1.0,
  0.0)
• glTexCoord2f(8.0, 8.0) glVertex3f(2000.0,
  1.0, -6000.0)
• glTexCoord2f(8.0, 0.0) glVertex3f(2000.0,
  -1.0, -6000.0)
• glEnd()
• glFlush()

57

• void reshape(int w, int h)
• glViewport(0, 0, (GLsizei) w, (GLsizei) h)
• glMatrixMode(GL_PROJECTION)
• glLoadIdentity()
• gluPerspective(60.0, (GLfloat)w/(GLfloat)h,
  1.0, 30000.0)
• glMatrixMode(GL_MODELVIEW)
• glLoadIdentity()
• void keyboard (unsigned char key, int x, int y)
  
• switch (key)
• case 27
• exit(0)
• break
• default
• break

58

• int main(int argc, char argv)
• glutInit(argc, argv)
• glutInitDisplayMode (GLUT_SINGLE GLUT_RGB
  GLUT_DEPTH)
• glutInitWindowSize (500, 500)
• glutInitWindowPosition (50, 50)
• glutCreateWindow (argv0)
• init ()
• glutDisplayFunc(display)
• glutReshapeFunc(reshape)
• glutKeyboardFunc(keyboard)
• glutMainLoop()
• return 0

59
?? ??
60
???? ?? ??

• ?? ?? 0?? ? ?? ?? ???? ?? ????? ?????
  gluBuildD1Mipmaps(), gluBuild2DMipmaps(),
  gluBuild3DMipmaps() ??? 1 1 ???? ???? ???? ???
  ??? ??? ??
• int gluBuild1DMipmaps(GLenum target, GLint
  internalFormat, GLint width, GLenum format,GLenum
  type, void texels)
• int gluBuild2DMipmaps(GLenum target, GLint
  internalFormat, GLint width, GLenum height,
  GLenum format, GLenum type, void texels)
• int gluBuild3DMipmpas(GLenum target, GLint
  internalFormat, GLint width, GLenum height,
  GLenum depth, GLenum format, GLenum type, void
  texels)
• ??? ??? ??? ???? ?? ??? glTexImageD()? ????.
• ?? ???? ????? ????? 0?? ???? ??? GLU ???? ??

61
??? ??? ?? ??

• ??? ??? ??? ???? ??? ??? ?? ??? ?? ??? ??? ??? ??
• ? log2 ?, ? ??? ??
• ? lt 0.0
• ???? ??? ???? ??, ???? ??
• ? gt 0.0
• ???? ??? ???? ??, ???? ??
• ?? ??, ??? ???? 64x64 ????, ??? ??? 32x32????
• ? 2.0, ? 1.0
• ??? ???? 64x32??, ??? ??? 8x16????
• ? 8.0, ? 3.0

62

• OpenGL? ??? ???? ???? ??? ???? ??
• GL_TEXTURE_BASE_LEVEL, GL_TEXTURE_MAX_LEVEL,
  GL_TEXTURE_MIN_LOD, GL_TEXTURE_MAX_LOD
• BASE_LEVEL
• ???? ?? ??? ?? ??? ??
• ???? 0
• MAX_LEVEL
• ??? ?? ??? ??
• ???? 1000
• ??? ?? BASE_LEVEL? ?? ?? ??? ??? ? ??? ?? ????
  ???? ?
• ?? ?? ??? MAX_LEVEL ?? ??? ?? ????, ??? ???
  1??(1, 1x1, 1x1x1)? ?? ??

63

• ??? ?? ???? ????

???? ?? ?
GL_TEXTURE_BASE_LEVEL ??? ?? ?? ???? ??? ???? ??(?? ?? ??? ?? ??) ?? ??? ?
GL_TEXTURE_MAX_LEVEL ??? ?? ?? ???? ??? ???? ??(?? ?? ??? ?? ??) ?? ??? ?
64
??? ??? ?? ??

• MIN_LOD? MAX_LOD? ?? ??? ?(? ,??? ???? ?????? ???
  ??)? ??, ???? ??
• BASE_LEVEL? MAX_LEVEL? ???? glTexParameter()?
  MIN_LOD? MAX_LOD? ??
• glTexParameterf(GL_TEXTURE_2D,
  GL_TEXTURE_MIN_LOD, 2.5)
• glTexParameterf(GL_TEXTURE_2D,
  GL_TEXTURE_MAX_LOD, 4.5)

65
???? ?? ?? ?? ??

• ?? ??? ??? ??? ?? gluBuildDMipmaps()???? ??? ??
  ??? ?? ??? ??.
• ?? ???? ????? ??? ??? ??? gluBuildDMipmapLevels()
  ? ??
• int gluBuild1DMipmapLevels(GLenum target, GLint
  internalFormat, GLint width, GLenum format,
  GLenum type, GLint level,GLint base, GLint max,
  void texels)
• int gluBuild2DMipmapLevels(GLenum target, GLint
  internalFormat, GLint width, Glint height, GLenum
  format, GLenum type, GLint level,GLint base,
  GLint max, void texels)
• int gluBuild3DMipmapLevels(GLenum target, GLint
  internalFormat, GLint width, Glint height, GLint
  depth,GLenum format, GLenum type, GLint
  level,GLint base, GLint max, void texels)

66
? ? ?

• ??? ?? ???? ?? ?????? ??? ????? ???? ??, ?? ???
  ?? ???? ??? ??? ????? ??
• ??? ???? ????? ?? ??, ?????? ?? ??? ?? ??
• glTexParameter()? ??, ?? ??? ??? ????.
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_MAG_FILTER, GL_NEAREST)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_MIN_FILTER, GL_NEAREST)

67
??? ??? ?? ??? ??

• GL_NEAREST(????) ??? ??? ??? ??? ??? ??? ??? ???
  ?? ??
• GL_LINEAR(???) ??? ??? ??? ??? ??? 2x2??? ??? ??
  ?? ??
• GL_NEAREST_MIPMAP_NEAREST ??? ????? ?? ??? ????
  ??
• GL_NEAREST_MIPMAP_LINEAR ??? ?? ??? ????? ??

???? ?
GL_TEXTURE_MAG_FLITER GL_NEAREST ?? GL_LINEAR
GL_TEXTURE_MIN_FILTER GL_NEAREST, GL_LINEAR, GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST_MIPMAP_LINEAR, GL_LINEAR_MIPMAP_NEAREST, GL_LINEAR_MIPMAP_LINEAR
68

• GL_LINEAR_MIPMAP_NEAREST ? ?? ? ??? ?? ??? ???
  ???? ? ? ?? ?? ????? ??
• GL_LINEAR_MIPMAP_LINEAR ? ?? ?? ?? ??? ???? ??
  ?? ???? ????, ? ?? ?? ????? ??

69
OpenGL ???? - ???
70
??? ????

• ??? ???? ????, ?? ??? ??? ??
• ??? ???? ??? ???? ???? ?? ?? ??
• ??? ???? ???? glTexImage() ?? ??
• ??? ???? ?? ??? ???? ?? ??
• ??? ??? ???.
• ??? ??? ??? ??? ???? ??? ???? ??? ????? ???
• ?? ???? ?? ??? ?? ?? ???? ??? ?? ??? ????? ???
  ???? ????? ??? ??? ???? ??
• ??? ????? ??? ???? ???? ???? ??? ?? ??? ? ??? ??.

71
??? ????? ??

• void glGenTextures(GLsizei n, GLuint
  textureNames)
• texture Names ??? ?? ??? ????? n?? ???? ?? ??? ??
• GLboolean glIsTexture(GLuint textureName)
• ??? ??? ????? ?????? ??
• ??? ??? ???? ?? ??? ?? ???? GL_FALSE? ??

72
??? ????? ??? ??

• glBindTexture()? ??? ????? ??? ??
• void glBindTexture(GLenum target, GLuint
  texture)
• ??? 0 ? ?? ?? ?? ??? textureName? ??? ? ??? ???
  ????? ?????, ? ??? ??
• ??? ???? ??? ????? ??? ? ? ??? ????? ???
• 0? ?? ??? textureName? ?? ? OpenGL? ??? ???? ???
  ??, ???? ?? ??? ???? ??

73
??9-7 ??? ???? ??? texbind.c

• include ltGL/glut.hgt
• include ltstdlib.hgt
• include ltstdio.hgt
• ifdef GL_VERSION_1_1
• define checkImageWidth 64
• define checkImageHeight 64
• static GLubyte checkImagecheckImageHeightcheckI
  mageWidth4
• static GLubyte otherImagecheckImageHeightcheckI
  mageWidth4
• static GLuint texName2

74

• void makeCheckImages(void)
• int i, j, c
• for (i 0 i lt checkImageHeight i)
• for (j 0 j lt checkImageWidth j)
• c ((((i0x8)0)((j0x8))0))255
• checkImageij0 (GLubyte) c
• checkImageij1 (GLubyte) c
• checkImageij2 (GLubyte) c
• checkImageij3 (GLubyte) 255
• c ((((i0x10)0)((j0x10))0))255

75

• otherImageij0 (GLubyte) c
• otherImageij1 (GLubyte) 0
• otherImageij2 (GLubyte) 0
• otherImageij3 (GLubyte) 255
• void init(void)
• glClearColor (0.0, 0.0, 0.0, 0.0)
• glShadeModel(GL_FLAT)
• glEnable(GL_DEPTH_TEST)

76

• makeCheckImages()
• glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
• glGenTextures(2, texName)
• glBindTexture(GL_TEXTURE_2D, texName0)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_WRAP_S, GL_CLAMP)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_WRAP_T, GL_CLAMP)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_MAG_FILTER,
• GL_NEAREST)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_MIN_FILTER,
• GL_NEAREST)
• glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
  checkImageWidth,
• checkImageHeight, 0, GL_RGBA,
  GL_UNSIGNED_BYTE,
• checkImage)

77

• glBindTexture(GL_TEXTURE_2D, texName1)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_WRAP_S, GL_CLAMP)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_WRAP_T, GL_CLAMP)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_MAG_FILTER, GL_NEAREST)
• glTexParameteri(GL_TEXTURE_2D,
  GL_TEXTURE_MIN_FILTER, GL_NEAREST)
• glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE,
  GL_DECAL)
• glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA,
  checkImageWidth,
• checkImageHeight, 0, GL_RGBA,
  GL_UNSIGNED_BYTE,
• otherImage)
• glEnable(GL_TEXTURE_2D)

78

• void display(void)
• glClear(GL_COLOR_BUFFER_BIT
  GL_DEPTH_BUFFER_BIT)
• glBindTexture(GL_TEXTURE_2D, texName0)
• glBegin(GL_QUADS)
• glTexCoord2f(0.0, 0.0) glVertex3f(-2.0, -1.0,
  0.0)
• glTexCoord2f(0.0, 1.0) glVertex3f(-2.0, 1.0,
  0.0)
• glTexCoord2f(1.0, 1.0) glVertex3f(0.0, 1.0,
  0.0)
• glTexCoord2f(1.0, 0.0) glVertex3f(0.0, -1.0,
  0.0)
• glEnd()

79

• glBindTexture(GL_TEXTURE_2D, texName1)
• glBegin(GL_QUADS)
• glTexCoord2f(0.0, 0.0) glVertex3f(1.0, -1.0,
  0.0)
• glTexCoord2f(0.0, 1.0) glVertex3f(1.0, 1.0,
  0.0)
• glTexCoord2f(1.0, 1.0) glVertex3f(2.41421,
  1.0, -1.41421)
• glTexCoord2f(1.0, 0.0) glVertex3f(2.41421,
  -1.0, -1.41421)
• glEnd()
• glFlush()
• void reshape(int w, int h)
• glViewport(0, 0, (GLsizei) w, (GLsizei) h)
• glMatrixMode(GL_PROJECTION)

80

• glLoadIdentity()
• gluPerspective(60.0, (GLfloat) w/(GLfloat) h,
  1.0, 30.0)
• glMatrixMode(GL_MODELVIEW)
• glLoadIdentity()
• glTranslatef(0.0, 0.0, -3.6)
• void keyboard(unsigned char key, int x, int y)
• switch (key)
• case 27
• exit(0)
• break

81

• int main(int argc, char argv)
• glutInit(argc, argv)
• glutInitDisplayMode(GLUT_SINGLE GLUT_RGB
  GLUT_DEPTH)
• glutInitWindowSize(250, 250)
• glutInitWindowPosition(100, 100)
• glutCreateWindow(argv0)
• init()
• glutReshapeFunc(reshape)
• glutDisplayFunc(display)
• glutKeyboardFunc (keyboard)
• glutMainLoop()
• return 0

82

• else
• int main(int argc, char argv)
• fprintf (stderr, "This program demonstrates a
  feature which is not in OpenGL Version 1.0.\n")
• fprintf (stderr, "If your implementation of
  OpenGL Version 1.0 has the right extensions,\n")
• fprintf (stderr, "you may be able to modify
  this program to make it run.\n")
• return 0
• endif

83
?? ??
84

• ??? ????? ???
• ??? ????? ??? ???? ? ? ????? ???? ??? ???? ????
  ??? ??
• ?? ??? ???? ???? ?? ? ??? ??? ??? ??? ? ??
• void glDeleteTexture(GLsizei n, const GLuint
  textureName)
• textureNames ??? ???? ??? n?? ??? ????? ??

85
???? ???? ?? ??

• ? ?? ????? ??(resident)?? ??? ?? ?? ???? ?? ???
  ??
• GLboolean glAreTexturesResident(GLsizei n, const
  GLuint textureNames, GLboolean residences)
• ???? ?? ??? ????? ?? ?? ? ??
• textureNames ??? ??? ?? n? ??? ????? ?? ??? ??
• residences? ??? ?? ??? textureNames ??? ?? ???
  ????? ??? ?? ??? ???? ??
• glAreTexturesResident()? ??? ?? ??? ??
• ??? ????? ??? ????, ?? ??? ?? ?? ??

86
??? ????

• ? ?? ???? ?? ??? ? ?? ????? ???? ???? ?? ??? ??
  ????? ???? ??
• void glPrioritizeTextures(GLsizei n, const
  GLuint, textureNames, const GLclampf
  priorities)
• n?? textureNames?? ????, priorities ??? ????
  ????? ?? ???? ??? ????? ??
• priorities ??? ?????? 0.0, 1.0 ??? ??? ????.
• 0? ?? ?? ??? ???? 1? ?? ?? ??? ????.

87
??? ??

• ???? ?? ???? ??? ??? ?????, ????? ??? ?? ??? ??
  ????? ??? ?? ?? ??
• glTexEnv()? ??? ??? ???? 4? ? ??? ??? ??? ??
• void glTexEnvif(GLenum target, GLenum pname,m
  TYPE param)
• void glTexEnvifv(GLenum target, GLenum pname,m
  TYPE param)
• ??? ???? ??? ??, target? GL_TEXTURE_ENV ??
• pname? GL_TEXTURE_ENV_MODE, GL_TEXTURE_ENV_COLOR
  ?
• param? ??? ????? ???? ?????? ???? ?????? ????,
  GL_DECAL, GL_REPLACE, GL_MODULATE, GL_BLEND
• ???? ??? ???? ?? ??? ??? ???? ??? ??? ?? ???
  ?????? ??

88

• ???? ??? ?? ?? (GL_REPLACE, GL_MODULATE)

??? ?? ?? ??? ?? ?? ??? ?? ??
GL_ALPHA C Cf A At C Cf A AfAt
GL_LUMINANCE C Lt A Af C CfLt A At
GL_ALUMINANCE_ALPHA C Lt C At C CfLt A AfAt
GL_INTENSITY C It A It C CfIt A AfIt
GL_RGB C Ct A At C CfCt A Af
GL_RGBA C Ct A Af C CfCt A AfAt
89

• ???? ??? ??? ?? (GL_DECAL, GL_BLEND)

??? ?? ?? ??? ?? ?? ??? ??? ??
GL_ALPHA ???? ?? C Ct A AfAt
GL_LUMINANCE ???? ?? CCf(1-Lt)CcLt A At
GL_LUMINANCE_ALPHA ???? ?? CCf(1-Lt)CcLt A AtAt
GL_INTENSITY ???? ?? CCf(1-Lt)CcLt AAf(1-Lt)AcLt
GL_RGB C Ct A Af CCf(1-Lt)CcLt A Af
GL_RGBA CCf(1At)CtAt A At CCf(1-Lt)CcLt A AfAt
90

• ??? ?? ??(GL_DECAL)? ????(GL_REPLACE)? ???? RGB?
  RGBA ?? ????? ????, ???? ???? ????? ??? ??
• ??? ?(GL_MODULATE) ?????? ??? ???? ????? ????.
• ?? ??? GL_LUMINANCE, GL_LUMINANCE_ALPHA,
  GL_INTENSITY? ? ???? ?? ??? ????.
• GL_RGB? GL_RGBA ?? ???? ??? ???? ?? ??? ???? ????
  ?? ????.
• ??? ???? ??? ??? ??? ??? ?? ???? ??? ?? ??? ??

91
??? ??? ??

• ??? ? ??? ?? ? ??? ??? ?? ???? ??? ??? ??? ???? ?
• ?? ?? ????? ??? ??? ??? ???? ???? ??? ??
• ??? ??? ??? ?? ??? ??? ? ??? ????? ??
• void glTexCoord1234sifd(TYPE coords)
• void glTexCoord1234vsifd(TYPE coords)
• ??? ??(s, t, r, q)? ??
• ?????? ( x, y, z, w)? ???? ?? ??? ??

92
???? ??? ???

• 0, 1 ?? ??? ??? ??? ??? ? ??, ??? ? ??? ?????
  ???? ? ? ??.
• ?? ???? ??? ??? ??? ?? ?
• 1.0?? ??? 1.0?? ??
• 0.0?? ???? 0.0?? ??
• ???? ?? ???? ?????, ??? ???? ??? ?????
• ?? ??? ??? ?? ? ? ??? ??? ?????? ?? ??? ??

93

• ?? ???? ??? ???? GL_LINEAR? ????? ??? ??? ?? ??
  ??? 2 2??? ??? ??? ??
• ???? ??? ??? ??? ??, ???? ??? ??? ??? ?? ???
• ???? GL_REPEAT ??? ?? ???
• ???? GL_CLAMP ????? ??? ??? ??? 2x2 ??? ???
• ???? GL_CLAMP_TO_EDGE ???? ?? ???.
• void glTexParameterif(GLenum target, GLenum
  pname, TYPE param)
• void glTexParameterifv(GLenum target, GLenum
  pname, TYPE param)
• ???? ?????? ?????, ??? ????? ???? ??? ???? ???
  ??? ??

94
?? 9-1??

• glBegin(GL_QUADS)
• glTexCoord2f(0.0, 0.0) glVertex3f(-2.0, -1.0,
  0.0)
• glTexCoord2f(0.0, 3.0) glVertex3f(-2.0, 1.0,
  0.0)
• glTexCoord2f(3.0, 3.0) glVertex3f(0.0, 1.0,
  0.0)
• glTexCoord2f(3.0, 0.0) glVertex3f(0.0, -1.0,
  0.0)
• glTexCoord2f(0.0, 0.0) glVertex3f(1.0, -1.0,
  0.0)
• glTexCoord2f(0.0, 3.0) glVertex3f(1.0, 1.0,
  0.0)
• glTexCoord2f(3.0, 3.0) glVertex3f(2.41421,
  1.0, -1.41421)
• glTexCoord2f(3.0, 0.0) glVertex3f(2.41421,
  -1.0, -1.41421)
• glEnd()

95

• GL_REPEAT ??? ??
• glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,
  GL_REPEAT)
• glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,
  GL_REPEAT)

96

• GL_CLAMP ??? ??
• glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,
  GL_CLAMP)
• glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,
  GL_CLAMP)

97

• glTexParameter() ???? ?

???? ???
GL_TEXTURE_WRAP_S GL_CLAMP, GL_CLAMP_TO_EDGE, GL_REPEAT
GL_TEXTURE_WRAP_T GL_CLAMP, GL_CLAMP_TO_EDGE, GL_REPEAT
GL_TEXTURE_WRAP_R GL_CLAMP, GL_CLAMP_TO_EDGE, GL_REPEAT
GL_TEXTURE_MAG_FILTER GL_CLAMP, GL_LINEAR
GL_TEXTURE_MIN_FILTER GL_NEAREST, GL_LINEAR, GL_NEAREST_MIPMAP_NEAREST, GL_NEAREST_MIPMAP_LINEAR, GLLINEAR_MIPMAP_NEAREST, GL_LINER_MIPMAP_LINEAR
98
???? ???
GL_TEXTURE_BORDER_COLOR 0.0, 1.0 ??? ?? 4?? ??
GL_TEXTURE_PRIORITY 0.0, 1.0?? ??? ??? ????
GL_TEXTURE_MIN_LOD ????? ?? ??? ??
GL_TEXTURE_MAX_LOD ????? ?? ??? ??
GL_TEXTURE_BASE_LEVEL ?? ???? ?? ??? ??
GL_TEXTURE_MAX_LEVEL ?? ???? ?? ??? ??
99
??? ?? ???? ????

• ??? ??? ????, ??? ??? ??? ???? ???? ??? ??? ????
  ?? ??? ??? ?? ??
• glTextureCoord() ??? OpenGL? ???? ??? ??? ?????
  ??.
• void glTexGenifd(GLenum coord, GLenum pname,
  TYPE param)
• void glTexGenidfv(GLenum coord, GLenum pname,
  TYPE param)
• ? ?? ???? coord? ??? ??? ?????? ???? ?? GL_S,
  GL_T, GL_R, GL_Q ??
• pname? GL_TEXTURE_GEN_MODE, GL_OBJECT_PLANE,
  GL_EYE_PLANE
• param? GL_OBJECT_LINEAR, GL_EYE_LINEAR,
  GL_SPHERE_LINEAR

100

• ??? ???
• GL_TEXTURE_GEN_MODE? GL_OBJECT_LINEAR? ????? ?
• ?? ??? ??(x0, y0, z0, w0)??? ?? ??
• ??? ?? p1x0 p2y0 p3z0 p4w0
• p14? GL_OBJECT_PLANE ?? ?? pname ??? ??
  glTextGenv()? param ??? ??
• p14? ??? ??? ? ? ??? ??? ?? ??? ??? ??
• ?? ??, p2p3p40??, p11?? ? ??? ??? x0 ?? ???
  ??? ????.
• ??? ??? ? ???? ????, ?? ???? ????, ??? ? ?? ?? ??
  ?? 0??.

101

• static Glfloat xequalzero 1.0, 0.0, 0.0,
  0.0
• x0 ??? ??
• glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, xequalzero)
  
• ????? ?? ???? ?? ??? ??.
• Static GLFloat slanted 1.0, 1.0, 1.0, 0.0
• ?? ???? xyz0 ??? ??, ????? ???.
• GL_OBJECT_LINEAR ??
• ??? ????? ??? ??? ????.
• ???? ??? ??? ?? ?? ???? ??? ???? ???.

102

• GL_EYE_LINEAR ??
• ???? ?? ?? ???? ???? ???
• ???? ?? ??? ??? ??(p1, p2, p3, p4)? ??? ??? ????
  ???.
• (p1, p2, p3, p4) (p1, p2, p3, p4) M-1
• (xe, ye, ze, we) ??? ????
• (p1, p2, p3, p4)? pname? GL_EYE_PLANE ?? ????? ?
  glTexGen()? param ??? ???
• ??? ?? p1 xe p2 ye p3 ze p4 we

103
??9-8 ?? ??? ?? ?? texgen.c

• include ltGL/glut.hgt
• include ltstdlib.hgt
• include ltstdio.hgt
• define stripeImageWidth 32
• GLubyte stripeImage4stripeImageWidth
• ifdef GL_VERSION_1_1
• static GLuint texName
• endif

104

• void makeStripeImage(void)
• int j
• for (j 0 j lt stripeImageWidth j)
• stripeImage4j (GLubyte) ((jlt4) ? 255
  0)
• stripeImage4j1 (GLubyte) ((jgt4) ? 255
  0)
• stripeImage4j2 (GLubyte) 0
• stripeImage4j3 (GLubyte) 255
• static GLfloat xequalzero 1.0, 0.0, 0.0,
  0.0
• static GLfloat slanted 1.0, 1.0, 1.0, 0.0
• static GLfloat currentCoeff

105

• static GLenum currentPlane
• static GLint currentGenMode
• void init(void)
• glClearColor (0.0, 0.0, 0.0, 0.0)
• glEnable(GL_DEPTH_TEST)
• glShadeModel(GL_SMOOTH)
• makeStripeImage()
• glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
• ifdef GL_VERSION_1_1
• glGenTextures(1, texName)
• glBindTexture(GL_TEXTURE_1D, texName)

106

• endif
• glTexParameteri(GL_TEXTURE_1D,
  GL_TEXTURE_WRAP_S, GL_REPEAT)
• glTexParameteri(GL_TEXTURE_1D,
  GL_TEXTURE_MAG_FILTER, GL_LINEAR)
• glTexParameteri(GL_TEXTURE_1D,
  GL_TEXTURE_MIN_FILTER, GL_LINEAR)
• ifdef GL_VERSION_1_1
• glTexImage1D(GL_TEXTURE_1D, 0, GL_RGBA,
  stripeImageWidth, 0,
• GL_RGBA, GL_UNSIGNED_BYTE,
  stripeImage)
• else
• glTexImage1D(GL_TEXTURE_1D, 0, 4,
  stripeImageWidth, 0,
• GL_RGBA, GL_UNSIGNED_BYTE,
  stripeImage)
• endif

107

• glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE,
  GL_MODULATE)
• currentCoeff xequalzero
• currentGenMode GL_OBJECT_LINEAR
• currentPlane GL_OBJECT_PLANE
• glTexGeni(GL_S, GL_TEXTURE_GEN_MODE,
  currentGenMode)
• glTexGenfv(GL_S, currentPlane, currentCoeff)
• glEnable(GL_TEXTURE_GEN_S)
• glEnable(GL_TEXTURE_1D)
• glEnable(GL_CULL_FACE)
• glEnable(GL_LIGHTING)
• glEnable(GL_LIGHT0)
• glEnable(GL_AUTO_NORMAL)

108

• glEnable(GL_NORMALIZE)
• glFrontFace(GL_CW)
• glCullFace(GL_BACK)
• glMaterialf (GL_FRONT, GL_SHININESS, 64.0)
• void display(void)
• glClear(GL_COLOR_BUFFER_BIT
  GL_DEPTH_BUFFER_BIT)
• glPushMatrix ()
• glRotatef(45.0, 0.0, 0.0, 1.0)

109

• ifdef GL_VERSION_1_1
• glBindTexture(GL_TEXTURE_1D, texName)
• endif
• glutSolidTeapot(2.0)
• glPopMatrix ()
• glFlush()
• void reshape(int w, int h)
• glViewport(0, 0, (GLsizei) w, (GLsizei) h)
• glMatrixMode(GL_PROJECTION)
• glLoadIdentity()

110

• if (w lt h)
• glOrtho (-3.5, 3.5, -3.5(GLfloat)h/(GLfloat
  )w,
• 3.5(GLfloat)h/(GLfloat)w, -3.5,
  3.5)
• else
• glOrtho (-3.5(GLfloat)w/(GLfloat)h,
• 3.5(GLfloat)w/(GLfloat)h, -3.5,
  3.5, -3.5, 3.5)
• glMatrixMode(GL_MODELVIEW)
• glLoadIdentity()

111

• void keyboard (unsigned char key, int x, int y)
• switch (key)
• case 'e'
• case 'E'
• currentGenMode GL_EYE_LINEAR
• currentPlane GL_EYE_PLANE
• glTexGeni(GL_S, GL_TEXTURE_GEN_MODE,
  currentGenMode)
• glTexGenfv(GL_S, currentPlane,
  currentCoeff)
• glutPostRedisplay()
• break

112

• case 'o'
• case 'O'
• currentGenMode GL_OBJECT_LINEAR
• currentPlane GL_OBJECT_PLANE
• glTexGeni(GL_S, GL_TEXTURE_GEN_MODE,
  currentGenMode)
• glTexGenfv(GL_S, currentPlane,
  currentCoeff)
• glutPostRedisplay()
• break
• case 's'
• case 'S'
• currentCoeff slanted
• glTexGenfv(GL_S, currentPlane,
  currentCoeff)
• glutPostRedisplay()
• break

113

• case 'x'
• case 'X'
• currentCoeff xequalzero
• glTexGenfv(GL_S, currentPlane,
  currentCoeff)
• glutPostRedisplay()
• break
• case 27
• exit(0)
• break
• default
• break

114

• int main(int argc, char argv)
• glutInit(argc, argv)
• glutInitDisplayMode (GLUT_SINGLE GLUT_RGB
  GLUT_DEPTH)
• glutInitWindowSize(256, 256)
• glutInitWindowPosition(100, 100)
• glutCreateWindow (argv0)
• init ()
• glutDisplayFunc(display)
• glutReshapeFunc(reshape)
• glutKeyboardFunc(keyboard)
• glutMainLoop()
• return 0

115
????
116
?? ?? ? ??

• ????? ??
• ????? ???? ???? ??? ???? ??? ??? ??? ??? ?? ????
  ???? ???? ?? ?
• ????? ??? ?? ?????? ???? ??? ??? ??? ??? ????
  ???? ???
• ???? ????? ??? ??? ? ????? ?? ?? ??
• ???? ??? ??? ?? ??? ?? ???? ? ??? ?? ???, ???? ??
  ????, ???? ?? ??? ??? ???? ?? ?? ??? ??? ??, ???
  ????? ??.
• glTexGeni(GL_S, GL_TEXTURE_GEN_MODE,
  GL_SPHERE_MAP)
• glTexGeni(GL_T, GL_TEXTURE_GEN_MODE,
  GL_SPHERE_MAP)
• glEnable(GL_TEXTURE_GEN_S)
• glEnable(GL_TEXTURE_GEN_T)

117
??? ?? ?? ? ??

• ???? ?? ??? ????? ?? ??? ????, ??? ??? ??? ???
  ??? ???? ?? 44??? ???
• ???? ?? ??? ??? ??, ????? ???? ??? ??? ??? ?????
• ???? ??? ??????, ? ???? ????, ????, ?????? ? ??
  ??? ???? ?
• ??? ??? ??? ??? ????, ??? ? ??? ??? ??? ???.
• glPushMatrix(), glPopMatrix(), glMultMatrix(),
  glRotate() ?? ?? ?? ?? ?? ??? ??? ??? ???? ??.
• ??? ??? ??? ???? ???? ?? ??? GL_TEXTURE ? ??
• glMatrixMode(GL_TEXTURE)
• ?

118
?????? ? ??

• ?????? ??? ??? ???? ??? ???? ??
• OpenGL 1.2??? ? ??? ????? ??? ?? ???? ???? ?? ??
• ?? ????? ? ?? ??? ??? ??? ??
• ??? ??? ??? ?? ??? ??? ??? ??? ??? ???? ??? ??,
  ?? ??? ???? ??
• ??????? ??? ??, ??, ??, ??? ??? ?? ?? ??

119

• ?? ????? ??
• 1) ????? ??? ?????? ??
• 2) ??? ???? ??? ?? ??? ???, ??, ??, ?? ?? ??? ???
  ???? ???? ??? ??
• 3) ??? ??? ? ??? ??? ?? ?? ?? ? ??? ??? ??? ????
  GLMULTITEXCOORDARB()? ????

120
??? ??? ??

• ??????? ??? ???? ??? ?????? ??? ?? ?? ?? ??? ???
  ???.
• ??? ??
• ?? ???? ??? ???? ??? ???? ??
• ??? ?? ??? ???? ???? ??? ??
• ??? ???
• ??? ??
• ?? ??
• ??? ?? ??
• ?? ??? ?? ??
• ?? ?? ??(??? ?)

121

• void glActiveTextureARB(GLenum texUnit)
• ???? ??? ?? ???? ??? ??? ??
• ?? ???? ??? ????? ????? ???? ???? ??? ??? ????
  ??? ? ??.

122
?? ??? ??? ??

• ????????, ??? ??? ??? ??? ?? ??? ??? ?? ???? ??
• ??? ??? ??? ??? ??? ??? ??? ? ??
• void glMultiTexCoord1234sifdARB(GLenum
  texUnit, TYPE coords)
• void glMultiTexCoord1234sifdvARB(GLenum
  texUnit, TYPE coords)
• ??? ??? texUnit?? ???? ?? coords? ??? ?? ?? (s,
  t, r, q)? ??
• texUnit ? ??? ??? glActiveTextureARB() ? ??? ??
  ??.

123
??? ?? ??? ?? ??

• glMultiTexCooredARB()?? ?? 2 ?? ??? ?? ??? ??
  ??? ????? ?? ??? ?? ?? ???.
• ?????? ???, ?? ??? ?? ??? ?????
• glActiveTextureARB()? ??? ??? ??? ??? ?? ??? ??
  ?? ??? ??? ???? ??
• glTexGen(..)
• glEnable(GL_TEXTURE_GEN_..)
• glDisable(GL_TEXTURE_GEN_..)

124

• ?????? ???? ?? ??? ??? ??? ?????
• glClientActiveTextureARB()? glTexCoordPointer()?
  ?? ??? ??? ?? ??? ????? ??
• void glClientActiveTextureARB(GLenum texUnit)
• ?? ??? ??? ??? ?? ?? ??? ???? ??? ??? ??? ??
• texUnit? glActiveTextureARB()?? ??? ?? ?? ?? ???
  GL_TEXTUREi_ARB ??? ???? ??