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  • 使用glReadPixels 读取颜色缓存,深度缓存和模板缓存数据

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

    format和type取值如下

    /* 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

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  • 原文地址:https://www.cnblogs.com/mazhenyu/p/5048927.html
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