Name IBM_multimode_draw_arrays Name Strings GL_IBM_multimode_draw_arrays Contact Ian Romanick, IBM (idr 'at' us.ibm.com) Version IBM Date: 2003/12/16 15:48:00 Revision: 1.2 Number 200 Dependencies OpenGL 1.1 is required. The language is written against the OpenGL 1.2 specification. Overview These functions behave identically to the standard OpenGL 1.1 functions glDrawArrays() and glDrawElements() except they handle multiple lists of vertices and multiple primitive modes in one call. Their main purpose is to allow one function call to render more than one primitive regardless of the primitive mode. This extension is similar to the EXT_multi_draw_arrays extension except that it accomodates the specification of a unique mode for each primitive. New Procedures and Functions void glMultiModeDrawArraysIBM(const GLenum *mode, const GLint *first, const GLsizei *count, GLsizei primcount, GLint modestride) Parameters ---------- mode Points to an array of primitive modes. Symbolic constants GL_POINTS, GL_LINE_STRIP, GL_LINE_LOOP, GL_LINES, GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_TRIANGLES, GL_QUAD_STRIP, GL_QUADS, and GL_POLYGON are accepted primitive modes. first Points to an array of starting indices in the enabled arrays. count Points to an array of the number of indices to be rendered. primcount Specifies the size of first and count arrays. The number of primitives. modestride Specifies the how the mode array is strided. Typical values are 0 (single primitive mode for all primitives) and sizeof(GLenum) (seperate primitive mode for each primitive). void glMultiModeDrawElementsIBM(const GLenum *mode, const GLsizei *count, GLenum type, const void * const *indices, GLsizei primcount, GLint modestride) Parameters ---------- mode Points to an array of primitive modes. Symbolic constants GL_POINTS, GL_LINE_STRIP, GL_LINE_LOOP, GL_LINES, GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_TRIANGLES, GL_QUAD_STRIP, GL_QUADS, and GL_POLYGON are accepted primitive modes. count Points to an array of the element counts type Specifies the type of the values in indices. Must be one of GL_UNSIGNED_BYTE, GL_UNSIGNED_SHORT, or GL_UNSIGNED_INT. indices Specifies a pointer to the location where the indices are stored. primcount Specifies the size of the count array. The number of primitives. modestride Specifies the how the mode array is strided. Typical values are 0 (single primitive mode for all primitives) and sizeof(GLenum) (seperate primitive mode for each primitive). New Tokens None Additions to Chapter 2 of the 1.2 Specification (OpenGL Operation) Section 2.8 Vertex Arrays: The command void glMultiModeDrawArraysIBM(const GLenum *mode, const GLint *first, const GLsizei *count, GLsizei primcount, GLint modestride) Behaves identically to DrawArrays except that a list of arrays and a list of primitive modes is specified instead. The number of lists is specified in the primcount parameter. It has the same effect as: for(i=0; i0) DrawArrays(*((GLenum *)((char *)mode+i*modestride)), *(first+i), *(count+i)); } The command void glMultiModeDrawElementsIBM(const GLenum *mode, const GLsizei *count, GLenum type, const void * const *indices, GLsizei primcount, GLint modestride) Behaves identically to DrawElements except that a list of arrays and a list of primitive mode is specified instead. The number of lists is specified in the primcount parameter. It has the same effect as: for(i=0; i0) DrawElements(*((GLenum *)((char *)mode+i*modestride)), *(count+i), type, *(indices+i)); } Additions to Chapter 3 of the 1.2 Specification (Rasterization) None. Additions to Chapter 4 of the 1.2 Specification (Per-Fragment Operations and None. Additions to Chapter 5 of the 1.2 Specification (Special Functions) None. Additions to Chapter 6 of the 1.2 Specification (State and State Requests) None. Additions to the GLX Specification None. GLX Protocol None. Errors GL_INVALID_ENUM is generated if contains an unaccepted value. GL_VALUE is generated if is negative. GL_INVALID_OPERATION is generated if glMultiModeDrawArraysIBM or glMultiModeDrawElementsIBM is executed between the execution of glBegin and the corresponding glEnd. New State None. Revision History 2003/12/16 idr Added missing const-qualifiers. 1998/12/10 Initial version.