📄 mapgrid.html
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<HTML><BODY><PRE> <STRONG>NAME</STRONG> <STRONG>glMapGrid1d,</STRONG> <STRONG>glMapGrid1f,</STRONG> <STRONG>glMapGrid2d,</STRONG> <STRONG>glMapGrid2f</STRONG> - define a one- or two-dimensional mesh <STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG> void <STRONG>glMapGrid1d</STRONG>( GLint <EM>un</EM>, GLdouble <EM>u1</EM>, GLdouble <EM>u2</EM> ) void <STRONG>glMapGrid1f</STRONG>( GLint <EM>un</EM>, GLfloat <EM>u1</EM>, GLfloat <EM>u2</EM> ) void <STRONG>glMapGrid2d</STRONG>( GLint <EM>un</EM>, GLdouble <EM>u1</EM>, GLdouble <EM>u2</EM>, GLint <EM>vn</EM>, GLdouble <EM>v1</EM>, GLdouble <EM>v2</EM> ) void <STRONG>glMapGrid2f</STRONG>( GLint <EM>un</EM>, GLfloat <EM>u1</EM>, GLfloat <EM>u2</EM>, GLint <EM>vn</EM>, GLfloat <EM>v1</EM>, GLfloat <EM>v2</EM> ) <STRONG>PARAMETERS</STRONG> <EM>un</EM> Specifies the number of partitions in the grid range interval [<EM>u1</EM>, <EM>u2</EM>]. Must be positive. <EM>u1</EM>, <EM>u2</EM> Specify the mappings for integer grid domain values i=0 and i=un. <EM>vn</EM> Specifies the number of partitions in the grid range interval [<EM>v1</EM>, <EM>v2</EM>] (<STRONG>glMapGrid2</STRONG> only). <EM>v1</EM>, <EM>v2</EM> Specify the mappings for integer grid domain values j=0 and j=vn (<STRONG>glMapGrid2</STRONG> only). <STRONG>DESCRIPTION</STRONG> <STRONG>glMapGrid</STRONG> and <STRONG>glEvalMesh</STRONG> are used together to efficiently generate and evaluate a series of evenly-spaced map domain values. <STRONG>glEvalMesh</STRONG> steps through the integer domain of a one- or two-dimensional grid, whose range is the domain of the evaluation maps specified by <STRONG>glMap1</STRONG> and <STRONG>glMap2</STRONG>. <STRONG>glMapGrid1</STRONG> and <STRONG>glMapGrid2</STRONG> specify the linear grid mappings between the i (or i and j) integer grid coordinates, to the u (or u and v) floating-point evaluation map coordinates. See <STRONG>glMap1</STRONG> and <STRONG>glMap2</STRONG> for details of how u and v coordinates are evaluated. <STRONG>glMapGrid1</STRONG> specifies a single linear mapping such that integer grid coordinate 0 maps exactly to <EM>u1</EM>, and integer grid coordinate <EM>un</EM> maps exactly to <EM>u2</EM>. All other integer grid coordinates i are mapped so that u = i(u2-u1)/un + u1 <STRONG>glMapGrid2</STRONG> specifies two such linear mappings. One maps integer grid coordinate i=0 exactly to <EM>u1</EM>, and integer grid coordinate i=un exactly to <EM>u2</EM>. The other maps integer grid coordinate j=0 exactly to <EM>v1</EM>, and integer grid coordinate j=vn exactly to <EM>v2</EM>. Other integer grid coordinates i and j are mapped such that u = i(u2-u1)/un + u1 v = j(v2-v1)/vn + v1 The mappings specified by <STRONG>glMapGrid</STRONG> are used identically by <STRONG>glEvalMesh</STRONG> and <STRONG>glEvalPoint</STRONG>. <STRONG>ERRORS</STRONG> <STRONG>GL_INVALID_VALUE</STRONG> is generated if either <EM>un</EM> or <EM>vn</EM> is not positive. <STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>glMapGrid</STRONG> is executed between the execution of <STRONG>glBegin</STRONG> and the corresponding execution of <STRONG>glEnd</STRONG>. <STRONG>ASSOCIATED</STRONG> <STRONG>GETS</STRONG> <STRONG>glGet</STRONG> with argument <STRONG>GL_MAP1_GRID_DOMAIN</STRONG> <STRONG>glGet</STRONG> with argument <STRONG>GL_MAP2_GRID_DOMAIN</STRONG> <STRONG>glGet</STRONG> with argument <STRONG>GL_MAP1_GRID_SEGMENTS</STRONG> <STRONG>glGet</STRONG> with argument <STRONG>GL_MAP2_GRID_SEGMENTS</STRONG> <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG> <STRONG>glEvalCoord</STRONG>, <STRONG>glEvalMesh</STRONG>, <STRONG>glEvalPoint</STRONG>, <STRONG>glMap1</STRONG>, <STRONG>glMap2</STRONG></PRE></BODY></HTML>⌨️ 快捷键说明
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