1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/* $Id: s_pixeltex.c,v 1.1 2000/10/31 18:00:04 keithw Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2000 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* This file implements both the GL_SGIX_pixel_texture and
* GL_SIGS_pixel_texture extensions. Luckily, they pretty much
* overlap in functionality so we use the same state variables
* and execution code for both.
*/
#include "glheader.h"
#include "colormac.h"
#include "s_pixeltex.h"
/*
* Convert RGBA values into strq texture coordinates.
*/
void
_mesa_pixeltexgen(GLcontext *ctx, GLuint n, const GLchan rgba[][4],
GLfloat s[], GLfloat t[], GLfloat r[], GLfloat q[])
{
if (ctx->Pixel.FragmentRgbSource == GL_CURRENT_RASTER_COLOR) {
GLuint i;
for (i = 0; i < n; i++) {
s[i] = ctx->Current.RasterColor[RCOMP];
t[i] = ctx->Current.RasterColor[GCOMP];
r[i] = ctx->Current.RasterColor[BCOMP];
}
}
else {
GLuint i;
ASSERT(ctx->Pixel.FragmentRgbSource == GL_PIXEL_GROUP_COLOR_SGIS);
for (i = 0; i < n; i++) {
s[i] = CHAN_TO_FLOAT(rgba[i][RCOMP]);
t[i] = CHAN_TO_FLOAT(rgba[i][GCOMP]);
r[i] = CHAN_TO_FLOAT(rgba[i][BCOMP]);
}
}
if (ctx->Pixel.FragmentAlphaSource == GL_CURRENT_RASTER_COLOR) {
GLuint i;
for (i = 0; i < n; i++) {
q[i] = ctx->Current.RasterColor[ACOMP];
}
}
else {
GLuint i;
ASSERT(ctx->Pixel.FragmentAlphaSource == GL_PIXEL_GROUP_COLOR_SGIS);
for (i = 0; i < n; i++) {
q[i] = CHAN_TO_FLOAT(rgba[i][ACOMP]);
}
}
}
|
