3 * Mesa 3-D graphics library
6 * Copyright (C) 1999-2002 Brian Paul All Rights Reserved.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 * This file implements both the GL_SGIX_pixel_texture and
29 * GL_SIGS_pixel_texture extensions. Luckily, they pretty much
30 * overlap in functionality so we use the same state variables
31 * and execution code for both.
39 #include "s_context.h"
40 #include "s_pixeltex.h"
41 #include "s_texture.h"
45 * Convert RGBA values into strq texture coordinates.
48 pixeltexgen(GLcontext
*ctx
, GLuint n
, const GLchan rgba
[][4],
49 GLfloat texcoord
[][4])
51 if (ctx
->Pixel
.FragmentRgbSource
== GL_CURRENT_RASTER_COLOR
) {
53 for (i
= 0; i
< n
; i
++) {
54 texcoord
[i
][0] = ctx
->Current
.RasterColor
[RCOMP
];
55 texcoord
[i
][1] = ctx
->Current
.RasterColor
[GCOMP
];
56 texcoord
[i
][2] = ctx
->Current
.RasterColor
[BCOMP
];
61 ASSERT(ctx
->Pixel
.FragmentRgbSource
== GL_PIXEL_GROUP_COLOR_SGIS
);
62 for (i
= 0; i
< n
; i
++) {
63 texcoord
[i
][0] = CHAN_TO_FLOAT(rgba
[i
][RCOMP
]);
64 texcoord
[i
][1] = CHAN_TO_FLOAT(rgba
[i
][GCOMP
]);
65 texcoord
[i
][2] = CHAN_TO_FLOAT(rgba
[i
][BCOMP
]);
69 if (ctx
->Pixel
.FragmentAlphaSource
== GL_CURRENT_RASTER_COLOR
) {
71 for (i
= 0; i
< n
; i
++) {
72 texcoord
[i
][3] = ctx
->Current
.RasterColor
[ACOMP
];
77 ASSERT(ctx
->Pixel
.FragmentAlphaSource
== GL_PIXEL_GROUP_COLOR_SGIS
);
78 for (i
= 0; i
< n
; i
++) {
79 texcoord
[i
][3] = CHAN_TO_FLOAT(rgba
[i
][ACOMP
]);
87 * Used by glDraw/CopyPixels: the incoming image colors are treated
88 * as texture coordinates. Use those coords to texture the image.
89 * This is for GL_SGIS_pixel_texture / GL_SGIX_pixel_texture.
92 _swrast_pixel_texture(GLcontext
*ctx
, struct sw_span
*span
)
96 ASSERT(!(span
->arrayMask
& SPAN_TEXTURE
));
97 span
->arrayMask
|= SPAN_TEXTURE
;
99 /* convert colors into texture coordinates */
100 pixeltexgen( ctx
, span
->end
,
101 (const GLchan (*)[4]) span
->array
->rgba
,
102 span
->array
->texcoords
[0] );
104 /* copy the new texture units for all enabled units */
105 for (unit
= 1; unit
< ctx
->Const
.MaxTextureUnits
; unit
++) {
106 if (ctx
->Texture
.Unit
[unit
]._ReallyEnabled
) {
107 MEMCPY( span
->array
->texcoords
[unit
], span
->array
->texcoords
[0],
108 span
->end
* 4 * sizeof(GLfloat
) );
112 /* apply texture mapping */
113 _swrast_texture_span( ctx
, span
);
115 /* this is a work-around to be fixed by initializing again span */
116 span
->arrayMask
&= ~SPAN_TEXTURE
;