3 * Mesa 3-D graphics library
5 * Copyright (C) 1995-2002 Brian Paul
7 * This library is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Library General Public
9 * License as published by the Free Software Foundation; either
10 * version 2 of the License, or (at your option) any later version.
12 * This library is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Library General Public License for more details.
17 * You should have received a copy of the GNU Library General Public
18 * License along with this library; if not, write to the Free
19 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 * SVGA driver for Mesa.
25 * Original author: Brian Paul
26 * Additional authors: Slawomir Szczyrba <steev@hot.pl> (Mesa 3.2)
36 #include "svgamesa24.h"
37 #include "swrast/swrast.h"
41 /* this doesn't compile with GCC on RedHat 6.1 */
42 static INLINE
int RGB2BGR24(int c
)
52 static unsigned long RGB2BGR24(unsigned long color
)
54 return (color
& 0xff00)|(color
>>16)|((color
& 0xff)<<16);
58 static void __svga_drawpixel24(int x
, int y
, GLubyte r
, GLubyte g
, GLubyte b
)
62 _RGB
*rgbBuffer
=(void *)SVGABuffer
.DrawBuffer
;
63 y
= SVGAInfo
->height
-y
-1;
64 offset
= y
* SVGAInfo
->width
+ x
;
66 rgbBuffer
[offset
].r
=r
;
67 rgbBuffer
[offset
].g
=g
;
68 rgbBuffer
[offset
].b
=b
;
71 static unsigned long __svga_getpixel24(int x
, int y
)
75 _RGB
*rgbBuffer
=(void *)SVGABuffer
.ReadBuffer
;
76 y
= SVGAInfo
->height
-y
-1;
77 offset
= y
* SVGAInfo
->width
+ x
;
78 return rgbBuffer
[offset
].r
<<16 | rgbBuffer
[offset
].g
<<8 | rgbBuffer
[offset
].b
;
81 void __clear_color24( GLcontext
*ctx
, const GLfloat color
[4] )
84 CLAMPED_FLOAT_TO_UBYTE(col
[0], color
[0]);
85 CLAMPED_FLOAT_TO_UBYTE(col
[1], color
[1]);
86 CLAMPED_FLOAT_TO_UBYTE(col
[2], color
[2]);
87 SVGAMesa
->clear_red
= col
[0];
88 SVGAMesa
->clear_green
= col
[1];
89 SVGAMesa
->clear_blue
= col
[2];
90 /* SVGAMesa->clear_truecolor = red<<16 | green<<8 | blue; */
93 void __clear24( GLcontext
*ctx
, GLbitfield mask
)
96 int x
= ctx
->DrawBuffer
->_Xmin
;
97 int y
= ctx
->DrawBuffer
->_Ymin
;
98 int width
= ctx
->DrawBuffer
->_Xmax
- x
;
99 int height
= ctx
->DrawBuffer
->_Ymax
- y
;
100 GLboolean all
= (width
== ctx
->DrawBuffer
->Width
&& height
== ctx
->DrawBuffer
->height
)
102 if (mask
& DD_FRONT_LEFT_BIT
) {
104 _RGB
*rgbBuffer
=(void *)SVGABuffer
.FrontBuffer
;
105 for (i
=0;i
<SVGABuffer
.BufferSize
/ 3;i
++) {
106 rgbBuffer
[i
].r
=SVGAMesa
->clear_red
;
107 rgbBuffer
[i
].g
=SVGAMesa
->clear_green
;
108 rgbBuffer
[i
].b
=SVGAMesa
->clear_blue
;
112 GLubyte
*tmp
= SVGABuffer
.DrawBuffer
;
113 SVGABuffer
.DrawBuffer
= SVGABuffer
.FrontBuffer
;
114 for (i
=x
;i
<width
;i
++)
115 for (j
=y
;j
<height
;j
++)
116 __svga_drawpixel24( i
, j
, SVGAMesa
->clear_red
,
117 SVGAMesa
->clear_green
,
118 SVGAMesa
->clear_blue
);
119 SVGABuffer
.DrawBuffer
= tmp
;
121 mask
&= ~DD_FRONT_LEFT_BIT
;
123 if (mask
& DD_BACK_LEFT_BIT
) {
125 _RGB
*rgbBuffer
=(void *)SVGABuffer
.BackBuffer
;
126 for (i
=0;i
<SVGABuffer
.BufferSize
/ 3;i
++) {
127 rgbBuffer
[i
].r
=SVGAMesa
->clear_red
;
128 rgbBuffer
[i
].g
=SVGAMesa
->clear_green
;
129 rgbBuffer
[i
].b
=SVGAMesa
->clear_blue
;
133 GLubyte
*tmp
= SVGABuffer
.DrawBuffer
;
134 SVGABuffer
.DrawBuffer
= SVGABuffer
.BackBuffer
;
135 for (i
=x
;i
<width
;i
++)
136 for (j
=y
;j
<height
;j
++)
137 __svga_drawpixel24( i
, j
, SVGAMesa
->clear_red
,
138 SVGAMesa
->clear_green
,
139 SVGAMesa
->clear_blue
);
140 SVGABuffer
.DrawBuffer
= tmp
;
142 mask
&= ~DD_BACK_LEFT_BIT
;
146 _swrast_Clear( ctx
, mask
);
149 void __write_rgba_span24( const GLcontext
*ctx
, GLuint n
, GLint x
, GLint y
,
150 const GLubyte rgba
[][4], const GLubyte mask
[] )
154 /* draw some pixels */
155 for (i
=0; i
<n
; i
++, x
++) {
157 __svga_drawpixel24( x
, y
, rgba
[i
][RCOMP
],
164 /* draw all pixels */
165 for (i
=0; i
<n
; i
++, x
++) {
166 __svga_drawpixel24( x
, y
, rgba
[i
][RCOMP
],
173 void __write_mono_rgba_span24( const GLcontext
*ctx
,
174 GLuint n
, GLint x
, GLint y
,
175 const GLchan color
[4], const GLubyte mask
[])
178 for (i
=0; i
<n
; i
++, x
++) {
180 __svga_drawpixel24( x
, y
, color
[RCOMP
], color
[GCOMP
], color
[BCOMP
]);
185 void __read_rgba_span24( const GLcontext
*ctx
, GLuint n
, GLint x
, GLint y
,
189 for (i
=0; i
<n
; i
++, x
++) {
190 *((GLint
*)rgba
[i
]) = RGB2BGR24(__svga_getpixel24( x
, y
));
194 void __write_rgba_pixels24( const GLcontext
*ctx
,
195 GLuint n
, const GLint x
[], const GLint y
[],
196 const GLubyte rgba
[][4], const GLubyte mask
[] )
199 for (i
=0; i
<n
; i
++) {
201 __svga_drawpixel24( x
[i
], y
[i
], rgba
[i
][RCOMP
],
208 void __write_mono_rgba_pixels24( const GLcontext
*ctx
,
210 const GLint x
[], const GLint y
[],
211 const GLchan color
[4], const GLubyte mask
[] )
214 for (i
=0; i
<n
; i
++) {
216 __svga_drawpixel24( x
[i
], y
[i
],
217 color
[RCOMP
], color
[GCOMP
], color
[BCOMP
] );
222 void __read_rgba_pixels24( const GLcontext
*ctx
,
223 GLuint n
, const GLint x
[], const GLint y
[],
224 GLubyte rgba
[][4], const GLubyte mask
[] )
227 for (i
=0; i
<n
; i
++,x
++) {
228 *((GLint
*)rgba
[i
]) = RGB2BGR24(__svga_getpixel24( x
[i
], y
[i
]));
235 /* silence compiler warning */
236 extern void _mesa_svga24_dummy_function(void);
237 void _mesa_svga24_dummy_function(void)