2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
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11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
26 * \file swrast/s_bitmap.c
27 * \brief glBitmap rendering.
32 #include "bufferobj.h"
37 #include "s_context.h"
46 _swrast_Bitmap( GLcontext
*ctx
, GLint px
, GLint py
,
47 GLsizei width
, GLsizei height
,
48 const struct gl_pixelstore_attrib
*unpack
,
49 const GLubyte
*bitmap
)
51 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
56 ASSERT(ctx
->RenderMode
== GL_RENDER
);
58 if (unpack
->BufferObj
->Name
) {
61 if (!_mesa_validate_pbo_access(unpack
, width
, height
, 1,
62 GL_COLOR_INDEX
, GL_BITMAP
,
64 _mesa_error(ctx
, GL_INVALID_OPERATION
,"glBitmap(invalid PBO access)");
67 buf
= (GLubyte
*) ctx
->Driver
.MapBuffer(ctx
, GL_PIXEL_UNPACK_BUFFER_EXT
,
71 /* buffer is already mapped - that's an error */
72 _mesa_error(ctx
, GL_INVALID_OPERATION
, "glBitmap(PBO is mapped)");
75 bitmap
= ADD_POINTERS(buf
, bitmap
);
78 RENDER_START(swrast
,ctx
);
80 if (SWRAST_CONTEXT(ctx
)->NewState
)
81 _swrast_validate_derived( ctx
);
83 INIT_SPAN(span
, GL_BITMAP
, width
, 0, SPAN_XY
);
85 if (ctx
->Visual
.rgbMode
) {
86 span
.interpMask
|= SPAN_RGBA
;
87 span
.red
= FloatToFixed(ctx
->Current
.RasterColor
[0] * CHAN_MAXF
);
88 span
.green
= FloatToFixed(ctx
->Current
.RasterColor
[1] * CHAN_MAXF
);
89 span
.blue
= FloatToFixed(ctx
->Current
.RasterColor
[2] * CHAN_MAXF
);
90 span
.alpha
= FloatToFixed(ctx
->Current
.RasterColor
[3] * CHAN_MAXF
);
91 span
.redStep
= span
.greenStep
= span
.blueStep
= span
.alphaStep
= 0;
94 span
.interpMask
|= SPAN_INDEX
;
95 span
.index
= FloatToFixed(ctx
->Current
.RasterIndex
);
100 _swrast_span_default_z(ctx
, &span
);
101 if (ctx
->Fog
.Enabled
)
102 _swrast_span_default_fog(ctx
, &span
);
103 if (ctx
->Texture
._EnabledCoordUnits
)
104 _swrast_span_default_texcoords(ctx
, &span
);
106 for (row
= 0; row
< height
; row
++, span
.y
++) {
107 const GLubyte
*src
= (const GLubyte
*) _mesa_image_address( unpack
,
108 bitmap
, width
, height
, GL_COLOR_INDEX
, GL_BITMAP
, 0, row
, 0 );
110 if (unpack
->LsbFirst
) {
112 GLubyte mask
= 1U << (unpack
->SkipPixels
& 0x7);
113 for (col
= 0; col
< width
; col
++) {
115 span
.array
->x
[count
] = px
+ col
;
116 span
.array
->y
[count
] = py
+ row
;
128 /* get ready for next row */
134 GLubyte mask
= 128U >> (unpack
->SkipPixels
& 0x7);
135 for (col
= 0; col
< width
; col
++) {
137 span
.array
->x
[count
] = px
+ col
;
138 span
.array
->y
[count
] = py
+ row
;
150 /* get ready for next row */
155 if (count
+ width
>= MAX_WIDTH
|| row
+ 1 == height
) {
158 if (ctx
->Visual
.rgbMode
)
159 _swrast_write_rgba_span(ctx
, &span
);
161 _swrast_write_index_span(ctx
, &span
);
167 RENDER_FINISH(swrast
,ctx
);
169 if (unpack
->BufferObj
->Name
) {
170 /* done with PBO so unmap it now */
171 ctx
->Driver
.UnmapBuffer(ctx
, GL_PIXEL_UNPACK_BUFFER_EXT
,
179 * XXX this is another way to implement Bitmap. Use horizontal runs of
180 * fragments, initializing the mask array to indicate which fragmens to
184 _swrast_Bitmap( GLcontext
*ctx
, GLint px
, GLint py
,
185 GLsizei width
, GLsizei height
,
186 const struct gl_pixelstore_attrib
*unpack
,
187 const GLubyte
*bitmap
)
189 SWcontext
*swrast
= SWRAST_CONTEXT(ctx
);
193 ASSERT(ctx
->RenderMode
== GL_RENDER
);
196 RENDER_START(swrast
,ctx
);
198 if (SWRAST_CONTEXT(ctx
)->NewState
)
199 _swrast_validate_derived( ctx
);
201 INIT_SPAN(span
, GL_BITMAP
, width
, 0, SPAN_MASK
);
203 /*span.arrayMask |= SPAN_MASK;*/ /* we'll init span.mask[] */
206 /*span.end = width;*/
207 if (ctx
->Visual
.rgbMode
) {
208 span
.interpMask
|= SPAN_RGBA
;
209 span
.red
= FloatToFixed(ctx
->Current
.RasterColor
[0] * CHAN_MAXF
);
210 span
.green
= FloatToFixed(ctx
->Current
.RasterColor
[1] * CHAN_MAXF
);
211 span
.blue
= FloatToFixed(ctx
->Current
.RasterColor
[2] * CHAN_MAXF
);
212 span
.alpha
= FloatToFixed(ctx
->Current
.RasterColor
[3] * CHAN_MAXF
);
213 span
.redStep
= span
.greenStep
= span
.blueStep
= span
.alphaStep
= 0;
216 span
.interpMask
|= SPAN_INDEX
;
217 span
.index
= FloatToFixed(ctx
->Current
.RasterIndex
);
222 _swrast_span_default_z(ctx
, &span
);
223 if (ctx
->Fog
.Enabled
)
224 _swrast_span_default_fog(ctx
, &span
);
225 if (ctx
->Texture
._EnabledCoordUnits
)
226 _swrast_span_default_texcoords(ctx
, &span
);
228 for (row
=0; row
<height
; row
++, span
.y
++) {
229 const GLubyte
*src
= (const GLubyte
*) _mesa_image_address( unpack
,
230 bitmap
, width
, height
, GL_COLOR_INDEX
, GL_BITMAP
, 0, row
, 0 );
232 if (unpack
->LsbFirst
) {
234 GLubyte mask
= 1U << (unpack
->SkipPixels
& 0x7);
235 for (col
=0; col
<width
; col
++) {
236 span
.array
->mask
[col
] = (*src
& mask
) ? GL_TRUE
: GL_FALSE
;
246 if (ctx
->Visual
.rgbMode
)
247 _swrast_write_rgba_span(ctx
, &span
);
249 _swrast_write_index_span(ctx
, &span
);
251 /* get ready for next row */
257 GLubyte mask
= 128U >> (unpack
->SkipPixels
& 0x7);
258 for (col
=0; col
<width
; col
++) {
259 span
.array
->mask
[col
] = (*src
& mask
) ? GL_TRUE
: GL_FALSE
;
269 if (ctx
->Visual
.rgbMode
)
270 _swrast_write_rgba_span(ctx
, &span
);
272 _swrast_write_index_span(ctx
, &span
);
274 /* get ready for next row */
280 RENDER_FINISH(swrast
,ctx
);