1 /* $Id: s_context.h,v 1.7 2001/03/12 00:48:41 gareth Exp $ */
4 * Mesa 3-D graphics library
7 * Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
27 * Keith Whitwell <keithw@valinux.com>
37 * For texture sampling:
39 typedef void (*TextureSampleFunc
)( GLcontext
*ctx
, GLuint texUnit
,
40 const struct gl_texture_object
*tObj
,
42 const GLfloat s
[], const GLfloat t
[],
43 const GLfloat u
[], const GLfloat lambda
[],
52 typedef void (_ASMAPIP blend_func
)( GLcontext
*ctx
, GLuint n
,
54 GLchan src
[][4], CONST GLchan dst
[][4] );
56 typedef void (*blend_func
)( GLcontext
*ctx
, GLuint n
, const GLubyte mask
[],
57 GLchan src
[][4], CONST GLchan dst
[][4] );
60 typedef void (*swrast_point_func
)( GLcontext
*ctx
, const SWvertex
*);
62 typedef void (*swrast_line_func
)( GLcontext
*ctx
,
63 const SWvertex
*, const SWvertex
*);
65 typedef void (*swrast_tri_func
)( GLcontext
*ctx
, const SWvertex
*,
66 const SWvertex
*, const SWvertex
*);
71 * Bitmasks to indicate which rasterization options are enabled (RasterMask)
73 #define ALPHATEST_BIT 0x001 /* Alpha-test pixels */
74 #define BLEND_BIT 0x002 /* Blend pixels */
75 #define DEPTH_BIT 0x004 /* Depth-test pixels */
76 #define FOG_BIT 0x008 /* Fog pixels */
77 #define LOGIC_OP_BIT 0x010 /* Apply logic op in software */
78 #define SCISSOR_BIT 0x020 /* Scissor pixels */
79 #define STENCIL_BIT 0x040 /* Stencil pixels */
80 #define MASKING_BIT 0x080 /* Do glColorMask or glIndexMask */
81 #define ALPHABUF_BIT 0x100 /* Using software alpha buffer */
82 #define WINCLIP_BIT 0x200 /* Clip pixels/primitives to window */
83 #define MULTI_DRAW_BIT 0x400 /* Write to more than one color- */
84 /* buffer or no buffers. */
85 #define OCCLUSION_BIT 0x800 /* GL_HP_occlusion_test enabled */
86 #define TEXTURE_BIT 0x1000 /* Texturing really enabled */
89 #define _SWRAST_NEW_RASTERMASK (_NEW_BUFFERS| \
103 /* Configuration mechanisms to make software rasterizer match
104 * characteristics of the hardware rasterizer (if present):
106 GLboolean AllowVertexFog
;
107 GLboolean AllowPixelFog
;
109 /* Derived values, invalidated on statechanges, updated from
110 * _swrast_validate_derived():
113 GLboolean _MultiTextureEnabled
;
114 GLfloat _MinMagThresh
[MAX_TEXTURE_UNITS
];
115 GLfloat _backface_sign
;
116 GLboolean _PreferPixelFog
;
118 /* Accum buffer temporaries.
120 GLboolean _IntegerAccumMode
; /* Storing unscaled integers? */
121 GLfloat _IntegerAccumScaler
; /* Implicit scale factor */
126 struct pixel_buffer
* PB
;
127 GLuint StippleCounter
; /* Line stipple counter */
131 /* Mechanism to allow driver (like X11) to register further
132 * software rasterization routines.
134 void (*choose_point
)( GLcontext
* );
135 void (*choose_line
)( GLcontext
* );
136 void (*choose_triangle
)( GLcontext
* );
138 GLuint invalidate_point
;
139 GLuint invalidate_line
;
140 GLuint invalidate_triangle
;
143 /* Function pointers for dispatch behind public entrypoints.
145 void (*InvalidateState
)( GLcontext
*ctx
, GLuint new_state
);
147 swrast_point_func Point
;
148 swrast_line_func Line
;
149 swrast_tri_func Triangle
;
151 /* Placeholders for when seperate specular (or secondary color) is
152 * enabled but texturing is not.
154 swrast_point_func SpecPoint
;
155 swrast_line_func SpecLine
;
156 swrast_tri_func SpecTriangle
;
159 /* Internal hooks, kept uptodate by the same mechanism as above.
161 blend_func BlendFunc
;
162 TextureSampleFunc TextureSample
[MAX_TEXTURE_UNITS
];
168 _swrast_validate_derived( GLcontext
*ctx
);
171 #define SWRAST_CONTEXT(ctx) ((SWcontext *)ctx->swrast_context)