1 /* $Id: svgamesa8.c,v 1.9.10.1 2006/11/02 12:02:17 alanh Exp $ */
4 * Mesa 3-D graphics library
6 * Copyright (C) 1995-2000 Brian Paul
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Library General Public
10 * License as published by the Free Software Foundation; either
11 * version 2 of the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Library General Public License for more details.
18 * You should have received a copy of the GNU Library General Public
19 * License along with this library; if not, write to the Free
20 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 * SVGA driver for Mesa.
26 * Original author: Brian Paul
27 * Additional authors: Slawomir Szczyrba <steev@hot.pl> (Mesa 3.2)
38 #include "svgamesa8.h"
39 #include "swrast/swrast.h"
42 static void __svga_drawpixel8(int x
, int y
, unsigned long c
)
45 y
= SVGAInfo
->height
-y
-1;
46 offset
= y
* SVGAInfo
->linewidth
+ x
;
47 SVGABuffer
.DrawBuffer
[offset
]=c
;
50 static unsigned long __svga_getpixel8(int x
, int y
)
53 y
= SVGAInfo
->height
-y
-1;
54 offset
= y
* SVGAInfo
->linewidth
+ x
;
55 return SVGABuffer
.ReadBuffer
[offset
];
58 void __clear_index8( GLcontext
*ctx
, GLuint index
)
60 SVGAMesa
->clear_index
= index
;
63 void __clear8( GLcontext
*ctx
, GLbitfield mask
)
66 int x
= ctx
->DrawBuffer
->_Xmin
;
67 int y
= ctx
->DrawBuffer
->_Ymin
;
68 int width
= ctx
->DrawBuffer
->_Xmax
- x
;
69 int height
= ctx
->DrawBuffer
->_Ymax
- y
;
70 GLboolean all
= (width
== ctx
->DrawBuffer
->Width
&& height
== ctx
->DrawBuffer
->height
)
72 if (mask
& DD_FRONT_LEFT_BIT
) {
74 memset(SVGABuffer
.FrontBuffer
, SVGAMesa
->clear_index
, SVGABuffer
.BufferSize
);
77 GLubyte
*tmp
= SVGABuffer
.DrawBuffer
;
78 SVGABuffer
.DrawBuffer
= SVGABuffer
.FrontBuffer
;
80 for (j
=y
;j
<height
;j
++)
81 __svga_drawpixel8(i
,j
,SVGAMesa
->clear_index
);
82 SVGABuffer
.DrawBuffer
= tmp
;
84 mask
&= ~DD_FRONT_LEFT_BIT
;
86 if (mask
& DD_BACK_LEFT_BIT
) {
88 memset(SVGABuffer
.BackBuffer
, SVGAMesa
->clear_index
, SVGABuffer
.BufferSize
);
91 GLubyte
*tmp
= SVGABuffer
.DrawBuffer
;
92 SVGABuffer
.DrawBuffer
= SVGABuffer
.BackBuffer
;
94 for (j
=y
;j
<height
;j
++)
95 __svga_drawpixel8(i
,j
,SVGAMesa
->clear_index
);
96 SVGABuffer
.DrawBuffer
= tmp
;
98 mask
&= ~DD_BACK_LEFT_BIT
;
102 _swrast_Clear( ctx
, mask
);
105 void __write_ci32_span8( const GLcontext
*ctx
, struct gl_renderbuffer
*rb
,
106 GLuint n
, GLint x
, GLint y
,
107 const GLuint index
[], const GLubyte mask
[] )
110 for (i
=0;i
<n
;i
++,x
++) {
112 __svga_drawpixel8( x
, y
, index
[i
]);
117 void __write_ci8_span8( const GLcontext
*ctx
, struct gl_renderbuffer
*rb
,
118 GLuint n
, GLint x
, GLint y
,
119 const GLubyte index
[], const GLubyte mask
[] )
123 for (i
=0;i
<n
;i
++,x
++) {
125 __svga_drawpixel8( x
, y
, index
[i
]);
130 void __write_mono_ci_span8( const GLcontext
*ctx
, struct gl_renderbuffer
*rb
,
131 GLuint n
, GLint x
, GLint y
,
132 GLuint colorIndex
, const GLubyte mask
[] )
135 for (i
=0;i
<n
;i
++,x
++) {
137 __svga_drawpixel8( x
, y
, colorIndex
);
142 void __read_ci32_span8( const GLcontext
*ctx
, struct gl_renderbuffer
*rb
,
143 GLuint n
, GLint x
, GLint y
, GLuint index
[])
146 for (i
=0; i
<n
; i
++,x
++) {
147 index
[i
] = __svga_getpixel8( x
, y
);
151 void __write_ci32_pixels8( const GLcontext
*ctx
, struct gl_renderbuffer
*rb
,
152 GLuint n
, const GLint x
[], const GLint y
[],
153 const GLuint index
[], const GLubyte mask
[] )
156 for (i
=0; i
<n
; i
++) {
158 __svga_drawpixel8( x
[i
], y
[i
], index
[i
]);
164 void __write_mono_ci_pixels8( const GLcontext
*ctx
, struct gl_renderbuffer
*rb
,
165 GLuint n
, const GLint x
[], const GLint y
[],
166 GLuint colorIndex
, const GLubyte mask
[] )
169 for (i
=0; i
<n
; i
++) {
171 __svga_drawpixel8( x
[i
], y
[i
], colorIndex
);
176 void __read_ci32_pixels8( const GLcontext
*ctx
, struct gl_renderbuffer
*rb
,
177 GLuint n
, const GLint x
[], const GLint y
[],
178 GLuint index
[], const GLubyte mask
[] )
181 for (i
=0; i
<n
; i
++,x
++) {
182 index
[i
] = __svga_getpixel8( x
[i
], y
[i
]);
190 /* silence compiler warning */
191 extern void _mesa_svga8_dummy_function(void);
192 void _mesa_svga8_dummy_function(void)