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<HTML><BODY><PRE> <STRONG>NAME</STRONG> <STRONG>glGetMapdv,</STRONG> <STRONG>glGetMapfv,</STRONG> <STRONG>glGetMapiv</STRONG> - return evaluator parameters <STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG> void <STRONG>glGetMapdv</STRONG>( GLenum <EM>target</EM>, GLenum <EM>query</EM>, GLdouble *<EM>v</EM> ) void <STRONG>glGetMapfv</STRONG>( GLenum <EM>target</EM>, GLenum <EM>query</EM>, GLfloat *<EM>v</EM> ) void <STRONG>glGetMapiv</STRONG>( GLenum <EM>target</EM>, GLenum <EM>query</EM>, GLint *<EM>v</EM> ) <STRONG>PARAMETERS</STRONG> <EM>target</EM> Specifies the symbolic name of a map. Accepted values are <STRONG>GL_MAP1_COLOR_4</STRONG>, <STRONG>GL_MAP1_INDEX</STRONG>, <STRONG>GL_MAP1_NORMAL</STRONG>, <STRONG>GL_MAP1_TEXTURE_COORD_1</STRONG>, <STRONG>GL_MAP1_TEXTURE_COORD_2</STRONG>, <STRONG>GL_MAP1_TEXTURE_COORD_3</STRONG>, <STRONG>GL_MAP1_TEXTURE_COORD_4</STRONG>, <STRONG>GL_MAP1_VERTEX_3</STRONG>, <STRONG>GL_MAP1_VERTEX_4</STRONG>, <STRONG>GL_MAP2_COLOR_4</STRONG>, <STRONG>GL_MAP2_INDEX</STRONG>, <STRONG>GL_MAP2_NORMAL</STRONG>, <STRONG>GL_MAP2_TEXTURE_COORD_1</STRONG>, <STRONG>GL_MAP2_TEXTURE_COORD_2</STRONG>, <STRONG>GL_MAP2_TEXTURE_COORD_3</STRONG>, <STRONG>GL_MAP2_TEXTURE_COORD_4</STRONG>, <STRONG>GL_MAP2_VERTEX_3</STRONG>, and <STRONG>GL_MAP2_VERTEX_4</STRONG>. <EM>query</EM> Specifies which parameter to return. Symbolic names <STRONG>GL_COEFF</STRONG>, <STRONG>GL_ORDER</STRONG>, and <STRONG>GL_DOMAIN</STRONG> are accepted. <EM>v</EM> Returns the requested data. <STRONG>DESCRIPTION</STRONG> <STRONG>glMap1</STRONG> and <STRONG>glMap2</STRONG> define evaluators. <STRONG>glGetMap</STRONG> returns evaluator parameters. <EM>target</EM> chooses a map, <EM>query</EM> selects a specific parameter, and <EM>v</EM> points to storage where the values will be returned. The acceptable values for the <EM>target</EM> parameter are described in the <STRONG>glMap1</STRONG> and <STRONG>glMap2</STRONG> reference pages. <EM>query</EM> can assume the following values: <STRONG>GL_COEFF</STRONG> <EM>v</EM> returns the control points for the evaluator function. One-dimensional evaluators return order control points, and two-dimensional evaluators return uorderxvorder control points. Each control point consists of one, two, three, or four integer, single-precision floating-point, or double-precision floating-point values, depending on the type of the evaluator. The GL returns two-dimensional control points in row-major order, incrementing the uorder index quickly and the vorder index after each row. Integer values, when requested, are computed by rounding the internal floating- point values to the nearest integer values. <STRONG>GL_ORDER</STRONG> <EM>v</EM> returns the order of the evaluator function. One-dimensional evaluators return a single value, order. The initial value is 1. Two-dimensional evaluators return two values, uorder and vorder. The initial value is 1,1. <STRONG>GL_DOMAIN</STRONG> <EM>v</EM> returns the linear u and v mapping parameters. One-dimensional evaluators return two values, u1 and u2, as specified by <STRONG>glMap1</STRONG>. Two-dimensional evaluators return four values (u1, u2, v1, and v2) as specified by <STRONG>glMap2</STRONG>. Integer values, when requested, are computed by rounding the internal floating-point values to the nearest integer values. <STRONG>NOTES</STRONG> If an error is generated, no change is made to the contents of <EM>v</EM>. <STRONG>ERRORS</STRONG> <STRONG>GL_INVALID_ENUM</STRONG> is generated if either <EM>target</EM> or <EM>query</EM> is not an accepted value. <STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>glGetMap</STRONG> is executed between the execution of <STRONG>glBegin</STRONG> and the corresponding execution of <STRONG>glEnd</STRONG>. <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG> <STRONG>glEvalCoord</STRONG>, <STRONG>glMap1</STRONG>, <STRONG>glMap2</STRONG></PRE></BODY></HTML>⌨️ 快捷键说明
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