ReactOS 0.4.15-dev-8191-gbc6c731
quads.c
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1/* $Id: quads.c,v 1.5 1997/08/19 02:44:18 brianp Exp $ */
2
3/*
4 * Mesa 3-D graphics library
5 * Version: 2.4
6 * Copyright (C) 1995-1997 Brian Paul
7 *
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.
12 *
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.
17 *
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.
21 */
22
23
24/*
25 * $Log: quads.c,v $
26 * Revision 1.5 1997/08/19 02:44:18 brianp
27 * added null_quad() and re-implemented gl_set_quad_function()
28 *
29 * Revision 1.4 1997/07/24 01:23:44 brianp
30 * changed precompiled header symbol from PCH to PC_HEADER
31 *
32 * Revision 1.3 1997/05/28 03:26:18 brianp
33 * added precompiled header (PCH) support
34 *
35 * Revision 1.2 1997/04/20 19:45:46 brianp
36 * added a comment
37 *
38 * Revision 1.1 1997/04/12 12:24:07 brianp
39 * Initial revision
40 *
41 */
42
43
44/*
45 * Quadrilateral rendering functions.
46 */
47
48
49#ifdef PC_HEADER
50#include "all.h"
51#else
52#include "types.h"
53#include "quads.h"
54#endif
55
56
57
58/*
59 * At this time there is no quadrilateral optimization. Just call the
60 * triangle function twice.
61 * v0, v1, v2, v3 in CCW order = front facing.
62 */
63static void quad( GLcontext *ctx,
65{
66 (*ctx->Driver.TriangleFunc)( ctx, v0, v1, v3, pv );
67 (*ctx->Driver.TriangleFunc)( ctx, v1, v2, v3, pv );
68}
69
70
71
72/*
73 * Draw nothing (NULL raster mode)
74 */
75static void null_quad( GLcontext *ctx,
77{
78}
79
80
81
83{
84 if (ctx->RenderMode==GL_RENDER) {
85 if (ctx->NoRaster) {
86 ctx->Driver.QuadFunc = null_quad;
87 }
88 else if (ctx->Driver.QuadFunc) {
89 /* Device driver will draw quads. */
90 }
91 else {
92 ctx->Driver.QuadFunc = quad;
93 }
94 }
95 else {
96 /* if in feedback or selection mode we can fall back to triangle code */
97 ctx->Driver.QuadFunc = quad;
98 }
99}
100
101
#define GL_RENDER
Definition: gl.h:388
unsigned int GLuint
Definition: gl.h:159
GLfloat v0
Definition: glext.h:6061
GLfloat GLfloat GLfloat GLfloat v3
Definition: glext.h:6064
GLfloat GLfloat v1
Definition: glext.h:6062
GLfloat GLfloat GLfloat v2
Definition: glext.h:6063
void gl_set_quad_function(GLcontext *ctx)
Definition: quads.c:82
static void quad(GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint v3, GLuint pv)
Definition: quads.c:63
static void null_quad(GLcontext *ctx, GLuint v0, GLuint v1, GLuint v2, GLuint v3, GLuint pv)
Definition: quads.c:75