使用glReadPixels 讀取顏色緩存，深度緩存和模板緩存數據

 

轉載，我看到的這篇博客也是轉載別人的，我都不知道原始在哪兒^_^

 

glReadPixels (GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLvoid *pixels);

format和type取值以下

/* PixelCopyType */
#define GL_COLOR                          0x1800
#define GL_DEPTH                          0x1801
#define GL_STENCIL                        0x1802

/* PixelFormat */
#define GL_COLOR_INDEX                    0x1900
#define GL_STENCIL_INDEX                  0x1901
#define GL_DEPTH_COMPONENT                0x1902
#define GL_RED                            0x1903
#define GL_GREEN                          0x1904
#define GL_BLUE                           0x1905
#define GL_ALPHA                          0x1906
#define GL_RGB                            0x1907
#define GL_RGBA                           0x1908
#define GL_LUMINANCE                      0x1909
#define GL_LUMINANCE_ALPHA                0x190A

 

/* DataType */#define GL_BYTE                           0x1400#define GL_UNSIGNED_BYTE                  0x1401#define GL_SHORT                          0x1402#define GL_UNSIGNED_SHORT                 0x1403#define GL_INT                            0x1404#define GL_UNSIGNED_INT                   0x1405#define GL_FLOAT                          0x1406#define GL_2_BYTES                        0x1407#define GL_3_BYTES                        0x1408#define GL_4_BYTES                        0x1409#define GL_DOUBLE                         0x140A