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D
glDepthFunc
Chapter 4
100
glDepthFunc
glDepthFunc
: specify the value used for depth buffer comparisons.
C Specification
void glDepthFunc(
GLenum func)
Parameters
func
Specifies the depth comparison function. Symbolic constants
GL_NEVER, GL_LESS, GL_EQUAL, GL_LEQUAL, GL_GREATER,
GL_NOTEQUAL, GL_GEQUAL, and GL_ALWAYS are accepted. The
initial value is GL_LESS.
Description
glDepthFunc specifies the function used to compare each incoming pixel depth value
with the depth value present in the depth buffer. The comparison is performed only if
depth testing is enabled. (See glEnable and glDisable of GL_DEPTH_TEST.)
func specifies the conditions under which the pixel will be drawn. The comparison
functions are as follows:
GL_NEVER
Never passes.
GL_LESS
Passes if the incoming depth value is less than the stored depth value.
GL_EQUAL
Passes if the incoming depth value is equal to the stored depth value.
GL_LEQUAL
Passes if the incoming depth value is less than or equal to the stored depth value.
GL_GREATER
Passes if the incoming depth value is greater than the stored depth value.
GL_NOTEQUAL
Passes if the incoming depth value is not equal to the stored depth value.
GL_GEQUAL
Passes if the incoming depth value is greater than or equal to the stored depth value.
GL_ALWAYS
Always passes.
The initial value of func is GL_LESS. Initially, depth testing is disabled.
Summary of Contents for c3700 - Workstation
Page 9: ...Chapter 1 9 1 A ...
Page 18: ...A glArrayElement Chapter 1 18 glNormalPointer glTexCoordPointer glVertexPointer ...
Page 19: ...Chapter 2 19 2 B ...
Page 40: ...B gluBuild2DMipmaps Chapter 2 40 ...
Page 41: ...Chapter 3 41 3 C ...
Page 49: ...C glXChooseVisual Chapter 3 49 See Also glXCreateContext glXGetConfig ...
Page 73: ...C glCopyPixels Chapter 3 73 glReadBuffer glReadPixels glStencilFunc ...
Page 84: ...C glCopyTexSubImage2D Chapter 3 84 glTexParameter glTexSubImage1D glTexSubImage2D ...
Page 93: ...Chapter 4 93 4 D ...
Page 99: ...D glDeleteTextures Chapter 4 99 glTexImage1D glTexImage2D glTexParameter ...
Page 127: ...Chapter 5 127 5 E ...
Page 148: ...E glEvalPoint Chapter 5 148 ...
Page 149: ...Chapter 6 149 6 F ...
Page 161: ...Chapter 7 161 7 G ...
Page 164: ...G glGenTextures Chapter 7 164 glTexImage1D glTexImage2D glTexParameter ...
Page 207: ...G glGetPointer Chapter 7 207 glSelectBuffer glTexCoordPointer glVertexPointer ...
Page 225: ...Chapter 8 225 8 H ...
Page 228: ...H glHint Chapter 8 228 ...
Page 229: ...Chapter 9 229 9 I ...
Page 248: ...I glIsTexture Chapter 9 248 ...
Page 249: ...Chapter 10 249 10 L ...
Page 256: ...L glLightModel Chapter 10 256 See Also glLight glMaterial ...
Page 271: ...Chapter 11 271 11 M ...
Page 291: ...Chapter 12 291 12 N ...
Page 312: ...N gluNurbsSurface Chapter 12 312 ...
Page 313: ...Chapter 13 313 13 O ...
Page 317: ...Chapter 14 317 14 P ...
Page 360: ...P glPushName Chapter 14 360 See Also glInitNames glLoadName glRenderMode glSelectBuffer ...
Page 362: ...P gluPwlCurve Chapter 14 362 ...
Page 363: ...Chapter 15 363 15 Q ...
Page 372: ...Q glXQueryVersion Chapter 15 372 glXQueryVersion ...
Page 373: ...Chapter 16 373 16 R ...
Page 390: ...R glRotate Chapter 16 390 ...
Page 391: ...Chapter 17 391 17 S ...
Page 397: ...S glScissor Chapter 17 397 See Also glEnable glViewport ...
Page 409: ...Chapter 18 409 18 T ...
Page 448: ...T glTexImage3DEXT Chapter 18 448 glTexGen glTexImage1D glTexImage2D glTexParameter ...
Page 457: ...T glTexSubImage1D Chapter 18 457 glTexImage2D glTexParameter glTexSubImage2D ...
Page 465: ...T glTranslate Chapter 18 465 See Also glMatrixMode glMultMatrix glPushMatrix glScale ...
Page 466: ...T glTranslate Chapter 18 466 ...
Page 467: ...Chapter 19 467 19 U ...
Page 469: ...U gluUnProject Chapter 19 469 See Also glGet gluProject ...
Page 471: ...U glXUseXFont Chapter 19 471 See Also glBitmap glXMakeCurrent ...
Page 472: ...U glXUseXFont Chapter 19 472 ...
Page 473: ...Chapter 20 473 20 V ...
Page 482: ...V glVisibilityBufferhp Chapter 20 482 ...
Page 483: ...Chapter 21 483 21 W ...
Page 486: ...W glXWaitX Chapter 21 486 ...