static GLuint max_buffer_index	(	GLcontext *	ctx,
		GLuint	count,
		GLenum	type,
		const void *	indices,
		struct gl_buffer_object *	elementBuf
	)		`[static]`

Find the max index in the given element/index buffer

Definition at line 37 of file api_validate.c.

Referenced by _mesa_validate_DrawElements(), and _mesa_validate_DrawRangeElements().

{
   const GLubyte *map = NULL;
   GLuint max = 0;
   GLint i;

   if (elementBuf->Name) {
      /* elements are in a user-defined buffer object.  need to map it */
      map = ctx->Driver.MapBuffer(ctx,
                                  GL_ELEMENT_ARRAY_BUFFER_ARB,
                                  GL_READ_ONLY,
                                  elementBuf);
      /* Actual address is the sum of pointers */
      indices = (const GLvoid *) ADD_POINTERS(map, (const GLubyte *) indices);
   }

   if (type == GL_UNSIGNED_INT) {
      for (i = 0; i < count; i++)
         if (((GLuint *) indices)[i] > max)
            max = ((GLuint *) indices)[i];
   }
   else if (type == GL_UNSIGNED_SHORT) {
      for (i = 0; i < count; i++)
         if (((GLushort *) indices)[i] > max)
            max = ((GLushort *) indices)[i];
   }
   else {
      ASSERT(type == GL_UNSIGNED_BYTE);
      for (i = 0; i < count; i++)
         if (((GLubyte *) indices)[i] > max)
            max = ((GLubyte *) indices)[i];
   }

   if (map) {
      ctx->Driver.UnmapBuffer(ctx,
                              GL_ELEMENT_ARRAY_BUFFER_ARB,
                              ctx->Array.ElementArrayBufferObj);
   }

   return max;
}

ReactOS Development > Doxygen