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290 lines
11 KiB
290 lines
11 KiB
Name
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PGI_misc_hints
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Name Strings
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GL_PGI_misc_hints
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Version
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$Date: 1996/04/12 22:54:15 $ $Revision: 1.7 $
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Number
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77
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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 various hints regarding
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desired level of conformance, performance, features, etc.
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New Procedures and Functions
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HintPGI
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New Tokens
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Accepted by the <target> parameters of Hint and HintPGI:
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PREFER_DOUBLEBUFFER_HINT_PGI 107000
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STRICT_DEPTHFUNC_HINT_PGI 107030
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STRICT_LIGHTING_HINT_PGI 107031
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STRICT_SCISSOR_HINT_PGI 107032
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FULL_STIPPLE_HINT_PGI 107033
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NATIVE_GRAPHICS_BEGIN_HINT_PGI 107011
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NATIVE_GRAPHICS_END_HINT_PGI 107012
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CONSERVE_MEMORY_HINT_PGI 107005
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RECLAIM_MEMORY_HINT_PGI 107006
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ALWAYS_FAST_HINT_PGI 107020
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ALWAYS_SOFT_HINT_PGI 107021
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ALLOW_DRAW_OBJ_HINT_PGI 107022
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ALLOW_DRAW_WIN_HINT_PGI 107023
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ALLOW_DRAW_FRG_HINT_PGI 107024
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ALLOW_DRAW_MEM_HINT_PGI 107025
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CLIP_NEAR_HINT_PGI 107040
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CLIP_FAR_HINT_PGI 107041
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WIDE_LINE_HINT_PGI 107042
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BACK_NORMALS_HINT_PGI 107043
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Accepted by the <pname> parameter of GetIntegerv
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GL_NATIVE_GRAPHICS_HANDLE_PGI 107010
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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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Function HintPGI behaves the same as Hint, except it accepts
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only the hints described below (and hints from the PGI_vertex_hints
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extension). HintPGI also has a slightly different prototype
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than Hint:
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void HintPGI ( GLenum target, GLint mode )
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HintPGI calls are sent to the server as Hint, so this function
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does not require additional server protocol.
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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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except for these hints: PREFER_DOUBLEBUFFER_HINT_PGI,
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NATIVE_GRAPHICS_BEGIN_HINT_PGI, NATIVE_GRAPHICS_END_HINT_PGI,
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RECLAIM_MEMORY_HINT_PGI.]
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<target> = PREFER_DOUBLEBUFFER_HINT_PGI
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This is a client-only mode. In some cases the PGI client may
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change the singlebuffer/doublebuffer attributes of some GLX
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visuals. If <mode> is TRUE, the client will tend to choose
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doublebuffer in these cases; if <mode> is FALSE, the client
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will tend to choose singlebuffer attributes.
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<target> = STRICT_DEPTHFUNC_HINT_PGI
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This hint indicates whether the application is willing to accept
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non-conformant depth functions. When <mode> is TRUE or NICEST,
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GL uses strictly conformant depth functions. When <mode> is
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FALSE, FASTEST, or DONT_CARE, GL may use an improper depth
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function.
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<target> = STRICT_LIGHTING_HINT_PGI
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This hint indicates whether the application is willing to accept
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non-conformant lighting operations. When <mode> is TRUE or NICEST,
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GL uses strictly conformant lighting operations. When <mode> is
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FALSE, FASTEST, or DONT_CARE, GL may use non-conformant lighting.
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<target> = STRICT_SCISSOR_HINT_PGI
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This hint indicates whether the application is willing to accept
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non-conformant scissoring operations. When <mode> is TRUE or NICEST,
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GL uses strictly conformant scissoring. When <mode> is FALSE,
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FASTEST, or DONT_CARE, GL may use non-conformant scissoring.
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<target> = FULL_STIPPLE_HINT_PGI
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This hint indicates whether the application is willing to accept
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non-conformant polygon stippling. When <mode> is TRUE or NICEST,
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GL uses strictly conformant polygon stippling. When <mode> is FALSE,
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FASTEST, or DONT_CARE, GL may use only a subset of the polygon
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stipple pattern.
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<target> = NATIVE_GRAPHICS_BEGIN_HINT_PGI
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This hint indicates that the application is about to perform
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rendering through the native API, outside the scope of GL. If
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<mode> is one of the parameters POINT, LINE, or FILL, then GL
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prepares the native API for rendering of that kind of primitive.
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If <mode> is TRUE, NICEST, or DONT_CARE, GL prepares the native
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API for rendering of any primitive. If <mode> is FASTEST, GL does
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minimal preparation of the native API, and the API may not be in a
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suitable state for any rendering. If <mode> is FALSE, GL does nothing.
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<target> = NATIVE_GRAPHICS_END_HINT_PGI
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This hint indicates that the application has completed native-API
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rendering outside the scope of GL, and that the application will not
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use native-API rendering until the next NATIVE_GRAPHICS_BEGIN_HINT_PGI
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hint. When <mode> is NICEST, GL assumes that the entire native-API
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state may be corrupted, and completely resets its state. When <mode>
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is TRUE, DONT_CARE, or FASTEST, GL performs minimal synchronization
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of the native-API state. When <mode> is FALSE, GL does not adjust
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the native-API state.
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<target> = CONSERVE_MEMORY_HINT_PGI
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The hint indicates that the application should attempt to conserve
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memory, perhaps at the cost of performance. The <mode> parameter
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indicates the level of conservation, from least conservation to
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most conservation: FALSE, FASTEST, DONT_CARE, TRUE, or NICEST.
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When <mode> is FALSE, GL does little or no memory conservation;
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when <mode> is NICEST, GL does the most agressive memory conservation.
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<target> = RECLAIM_MEMORY_HINT_PGI
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The hint indicates that the application should reclaim unused
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memory immediately. The <mode> parameter indicates how aggressively
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GL reclaims memory: FALSE, FASTEST, DONT_CARE, TRUE, or NICEST.
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When <mode> is FALSE, GL reclaims little or no memory;
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when <mode> is NICEST, GL does the most agressive memory reclaimation.
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<target> = ALLOW_DRAW_OBJ_HINT_PGI
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<target> = ALLOW_DRAW_WIN_HINT_PGI
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<target> = ALLOW_DRAW_SPN_HINT_PGI
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<target> = ALLOW_DRAW_MEM_HINT_PGI
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<target> = ALWAYS_FAST_HINT_PGI
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<target> = ALWAYS_SOFT_HINT_PGI
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The <mode> for each of these hints may be TRUE or FALSE only.
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Each of the ALLOW_DRAW_xxx_HINT_PGI hints indicates if OpenGL
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low-level rendering may occur at the object-coordinate level,
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window-coordinate level, fragment level, or plain-memory level.
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If <mode> for a given <target> is TRUE, rendering may occur at
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that level; if the <mode> is FALSE, rendering will not occur at
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that level (perhaps at the expense of performance or conformance).
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The two ALWAYS_xxxx_HINT_PGI hints describe combinations of the
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ALLOW_DRAW_xxx_HINT_PGI hints. If ALWAYS_FAST_HINT_PGI is TRUE,
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then ALLOW_DRAW_OBJ_HINT_PGI is set TRUE, and the other ALLOW_DRAW_-
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xxx_HINT_PGI hints are set to FALSE. If ALWAYS_FAST_HINT_PGI is
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FALSE, then all ALLOW_DRAW_xxx_HINT_PGI hints are set TRUE.
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If ALWAYS_SOFT_HINT_PGI is TRUE, then ALLOW_DRAW_OBJ_HINT_PGI
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is set FALSE, ALLOW_DRAW_MEM_HINT_PGI is set TRUE, and
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ALLOW_DRAW_WIN_HINT_PGI and ALLOW_DRAW_SPN_HINT_PGI are set to
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TRUE or FALSE in an implementation-dependent manner.
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<target> = CLIP_NEAR_HINT_PGI
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<target> = CLIP_FAR_HINT_PGI
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These hints indicate that the application does not require
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hither/yon clipping when the depth test is disabled. (The hint
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has no effect when depth testing is enabled.) If <mode> is FALSE,
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DONT_CARE, or FASTEST, GL may inhibit hither/yon clipping in some
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situations. If <mode> is NICEST, or TRUE, GL performs ordinary
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hither/yon clipping. If hither or yon clipping is disabled, and
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if fragment depth values fall outside the range [0.0-1.0], then
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rendering behavior is implementation-dependent.
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<target> = LINE_WIDE_HINT_PGI
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Indicates the rendering quality and speed of lines whose widths are
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not equal to 1.0. Allowed values are GL_FASTEST, GL_NICEST, and
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GL_DONT_CARE.
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<target> = BACK_NORMALS_HINT
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Indicates that normals of backfacing facets should be inverted
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when lighting is enabled, even if LIGHT_MODEL_TWO_SIDE is disabled.
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The hint has no effect when lighting is disabled, and when
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LIGHT_MODEL_TWO_SIDE is enabled. If <mode> is FALSE, DONT_CARE,
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or NICEST, GL inverts normals only when LIGHT_MODEL_TWO_SIDE is
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enabled. If <mode> is FASTEST or TRUE, GL inverts the normals
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of backfacing facets whenever lighting is enabled.
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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_vertex_hints
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If PGI_vertex_hints is available, then hints from that extension
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may be used with the HintPGI function.
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Errors
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INVALID_ENUM is generated if <target> or <mode> for Hint or HintPGI
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is not one of the GLenums discussed above.
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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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STRICT_DEPTHFUNC_HINT_PGI GetIntegerv Z TRUE hint
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STRICT_LIGHTING_HINT_PGI GetIntegerv Z TRUE hint
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STRICT_SCISSOR_HINT_PGI GetIntegerv Z TRUE hint
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FULL_STIPPLE_HINT_PGI GetIntegerv Z TRUE hint
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CONSERVE_MEMORY_HINT_PGI GetIntegerv Z FALSE hint
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ALWAYS_FAST_HINT_PGI GetIntegerv Z FALSE hint
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ALWAYS_SOFT_HINT_PGI GetIntegerv Z FALSE hint
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ALLOW_DRAW_OBJ_HINT_PGI GetIntegerv Z TRUE hint
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ALLOW_DRAW_WIN_HINT_PGI GetIntegerv Z TRUE hint
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ALLOW_DRAW_SPN_HINT_PGI GetIntegerv Z TRUE hint
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ALLOW_DRAW_MEM_HINT_PGI GetIntegerv Z TRUE hint
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WIDE_LINE_HINT_PGI GetIntegerv Z DONT_CARE hint
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CLIP_NEAR_HINT_PGI GetIntegerv Z TRUE hint
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CLIP_FAR_HINT_PGI GetIntegerv Z TRUE hint
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BACK_NORMALS_HINT_PGI GetIntegerv Z FALSE hint
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New Implementation Dependent 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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PREFER_DOUBLEBUFFER_HINT_PGI GetIntegerv Z +++ client
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NATIVE_GRAPHICS_HANDLE_PGI GetIntegerv Z *** client
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+++ Implementation-dependent. (TRUE preferred.)
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*** 0 if direct rendering to native API is not available;
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otherwise, this is the handle for direct rendering to native API
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