216 lines
7.9 KiB
Plaintext
216 lines
7.9 KiB
Plaintext
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PGI_vertex_hints
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Name Strings
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GL_PGI_vertex_hints
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Version
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$Date: 1996/04/12 22:54:16 $ $Revision: 1.6 $
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Number
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76
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Dependencies
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None
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Overview
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The extension allows the app to give hints regarding what kinds of
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OpenGL function calls will happen between Begin/End pairs.
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New Procedures and Functions
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None
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New Tokens
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Accepted by the <target> parameters of Hint and HintPGI:
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VERTEX_DATA_HINT_PGI 107050
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VERTEX_CONSISTENT_HINT_PGI 107051
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MATERIAL_SIDE_HINT_PGI 107052
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MAX_VERTEX_HINT_PGI 107053
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Accepted by the <mode> parameters of Hint and HintPGI:
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COLOR3_BIT_PGI 0x00010000
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COLOR4_BIT_PGI 0x00020000
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EDGEFLAG_BIT_PGI 0x00040000
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INDEX_BIT_PGI 0x00080000
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MAT_AMBIENT_BIT_PGI 0x00100000
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MAT_AMBIENT_AND_DIFFUSE_BIT_PGI 0x00200000
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MAT_DIFFUSE_BIT_PGI 0x00400000
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MAT_EMISSION_BIT_PGI 0x00800000
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MAT_COLOR_INDEXES_BIT_PGI 0x01000000
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MAT_SHININESS_BIT_PGI 0x02000000
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MAT_SPECULAR_BIT_PGI 0x04000000
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NORMAL_BIT_PGI 0x08000000
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TEXCOORD1_BIT_PGI 0x10000000
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TEXCOORD2_BIT_PGI 0x20000000
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TEXCOORD3_BIT_PGI 0x40000000
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TEXCOORD4_BIT_PGI 0x80000000
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VERTEX23_BIT_PGI 0x00000004
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VERTEX4_BIT_PGI 0x00000008
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Additions to Chapter 2 of the 1.0 Specification (OpenGL Operation)
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None
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Additions to Chapter 3 of the 1.0 Specification (Rasterization)
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None
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Additions to Chapter 4 of the 1.0 Specification (Per-Fragment Operations
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and the Frame Buffer)
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None
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Additions to Chapter 5 of the 1.0 Specification (Special Functions)
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Functions Hint and HintPGI accept the following targets and modes:
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[All hints are subject to Push/Pop with the HINT_BIT attributes.]
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<target> = VERTEX_DATA_HINT_PGI
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This hint indicates which GL calls might occur between Begin/End pairs.
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If <mode> is any of FALSE, then the hint is "disabled" -- this means
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the application is not making any predictions about which GL calls
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might occur between Begin/End pairs. Otherwise, <mode> must be a
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bitwise OR of the following bits:
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COLOR3_BIT_PGI Color3*
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COLOR4_BIT_PGI Color4*
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EDGEFLAG_BIT_PGI EdgeFlag*
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INDEX_BIT_PGI Index*
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MAT_AMBIENT_BIT_PGI Material*(pname=AMBIENT)
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MAT_AMBIENT_AND_DIFFUSE_BIT_PGI Material*(pname=AMBIENT_AND_DIFFUSE)
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MAT_DIFFUSE_BIT_PGI Material*(pname=DIFFUSE)
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MAT_EMISSION_BIT_PGI Material*(pname=EMISSION)
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MAT_COLOR_INDEXES_BIT_PGI Material*(pname=COLOR_INDEXES)
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MAT_SHININESS_BIT_PGI Material*(pname=SHININESS)
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MAT_SPECULAR_BIT_PGI Material*(pname=SPECULAR)
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NORMAL_BIT_PGI Normal*
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TEXCOORD1_BIT_PGI TexCoord1*
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TEXCOORD2_BIT_PGI TexCoord2*
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TEXCOORD3_BIT_PGI TexCoord3*
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TEXCOORD4_BIT_PGI TexCoord4*
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VERTEX23_BIT_PGI Vertex[23]*
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VERTEX4_BIT_PGI Vertex4
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At least one of the bits VERTEX23_BIT_PGI or VERTEX4_BIT_PGI must be
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set in <mode>.
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Each bit above indicates that one of the associated OpenGL functions
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might occur between Begin/End pairs. If <mode> does not contain a
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given bit, then GL may assume that associated functions will not occur
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between Begin/End pairs -- in this case, behavior of these functions
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is undefined. (But the functions will not cause program termination.)
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<target> = VERTEX_CONSISTENT_HINT_PGI
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This hint indicates that OpenGL function calls will occur
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consistently between Begin/End pairs. If <mode> is either
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TRUE or FASTEST, then the application effectively is making
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the following assertion: Between Begin/End pairs, if any of
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the following functions -- Color, EdgeFlag, Index, Material,
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Normal, TexCoord -- occurs before one Vertex call, then it
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will occur before all Vertex calls. (Where "before" means the
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function will occur between the current Vertex function and the
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previous Vertex of Begin function.) If <mode> is NICEST, DONT_CARE,
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or FALSE, the application is asserting that any sequence of
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functions might occur between Begin/End pairs.
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If both VERTEX_CONSISTENT_HINT_PGI and VERTEX_DATA_HINT_PGI are
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enabled, then GL further assumes that any functions indicated in
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VERTEX_DATA_HINT_PGI will be called before each vertex call. When
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a single bit in VERTEX_DATA_HINT_PGI indicates a group of possible
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functions, GL assumes that at least one function from the group will
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be called before each Vertex function between Begin/End pairs.
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<target> = MAX_VERTEX_HINT_PGI
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This hint indicates the maximum number of Vertex functions which
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will occur between Begin/End pairs. If <mode> is FALSE then the
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hint is "disabled" -- any number of Vertex functions might occur
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between Begin/End pairs. However, if <mode> is any value greater
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than 0, then the application is asserting that at most that number
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of Vertex functions will occur between Begin/End pairs. In this
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case, if the application exceeds the promised number of Vertex
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calls, program termination may occur. Negative numbers also
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disable the hint.
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<target> = MATERIAL_SIDE_HINT_PGI
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This hint indicates which <face> paramters will occur for any
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Material functions called between Begin/End pairs. If <mode>
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is any of FALSE, DONT_CARE, NICEST, then this hint is "disabled" --
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any <face> parameters might occur in Material functions called
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between Begin/End pairs. If <mode> is FRONT, BACK, or
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FRONT_AND_BACK, then only the given value will be used in
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Material functions called between Begin/End pairs. If <mode>
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is TRUE or FASTEST, then only a single (unspecified) <face>
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parameter will be used in Material functions called between
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Begin/End pairs.
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Additions to Chapter 6 of the 1.0 Specification (State and State Requests)
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None
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Additions to the GLX Specification
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None
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GLX Protocol
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None
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Interactions with PGI_misc_hints
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If the PGI_misc_hints extension is available, then the hints
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described above can be used through the HintPGI client function.
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If PGI_misc_hints is not avialable, then the hints above must
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be used through the usual Hint function.
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Errors
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INVALID_VALUE is generated if <target> for Hint or HintPGI is
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VERTEX_DATA_HINT_PGI and <mode> is not FALSE or some combination
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of the bits xxx_BIT_PGI. Also, if <mode> does not contain
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VERTEX23_BIT_PGI or VERTEX4_BIT_PGI (or both), then INVALID_VALUE
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is generated.
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INVALID_ENUM is generated if <target> for Hint or HintPGI is
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VERTEX_CONSISTENT_HINT_PGI and <mode> is not FASTEST, NICEST,
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DONT_CARE, TRUE, or FALSE
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INVALID_VALUE is generated if <target> for Hint or HintPGI is
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MAX_VERTEX_HINT_PGI and <mode> is a negative number.
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INVALID_ENUM is generated if <target> for Hint or HintPGI is
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MATERIAL_SIDE_HINT_PGI and <mode> is not FASTEST, NICEST,
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DONT_CARE, TRUE, FALSE, FRONT, BACK, or FRONT_AND_BACK.
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New State
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Initial
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Get Value Get Command Type Value Attrib
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--------- ----------- ---- ------- ------
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VERTEX_DATA_HINT_PGI GetIntegerv Z FALSE
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VERTEX_CONSISTENT_HINT_PGI GetIntegerv Z FALSE
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MAX_VERTEX_HINT_PGI GetIntegerv Z FALSE
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MATERIAL_SIDE_HINT_PGI GetIntegerv Z FALSE
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New Implementation Dependent State
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None
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