HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 152

F glFeedbackBuffer The following table gives the correspondence between type and the number of values per vertex. k is 1 in color index mode and 4 in RGBA mode. Table 6-1 type GL_2D GL_3D GL_3D_COLOR GL_3D_COLOR_TEXTURE GL_4D_COLOR_TEXTURE Coordinates Color Texture Total number of values x, y 2 x, y, z 3 x, y, z k 3+k x, y, z k 4 7+k x, y, z, w k 4 8+k Feedback vertex coordinates are in window coordinates, except w, which is in clip coordinates. Feedback colors are lighted, if lighting is enabled. Feedback texture coordinates are generated, if texture coordinate generation is enabled. They are always transformed by the texture matrix. Notes glFeedbackBuffer, when used in a display list, is not compiled into the display list but is executed immediately. Errors • GL_INVALID_ENUM is generated if type is not an accepted value. • GL_INVALID_VALUE is generated if size is negative. • GL_INVALID_OPERATION is generated if glFeedbackBuffer is called while the render mode is GL_FEEDBACK, or if glRenderMode is called with argument GL_FEEDBACK before glFeedbackBuffer is called at least once. • GL_INVALID_OPERATION is generated if glFeedbackBuffer is executed between the execution of glBegin and the corresponding execution of glEnd. Associated Gets glGet with argument GL_RENDER_MODE See Also glBegin, glLineStipple, glPassThrough, glPolygonMode, glRenderMode, glSelectBuffer 152 Chapter 6