points.c revision 3464ebd5 
1/**
2 * \file points.c
3 * Point operations.
4 */
5
6/*
7 * Mesa 3-D graphics library
8 * Version:  7.1
9 *
10 * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
11 *
12 * Permission is hereby granted, free of charge, to any person obtaining a
13 * copy of this software and associated documentation files (the "Software"),
14 * to deal in the Software without restriction, including without limitation
15 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
16 * and/or sell copies of the Software, and to permit persons to whom the
17 * Software is furnished to do so, subject to the following conditions:
18 *
19 * The above copyright notice and this permission notice shall be included
20 * in all copies or substantial portions of the Software.
21 *
22 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
23 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
24 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
25 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
26 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
27 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
28 */
29
30
31#include "glheader.h"
32#include "context.h"
33#include "macros.h"
34#include "points.h"
35#include "mtypes.h"
36
37
38/**
39 * Set current point size.
40 * \param size  point diameter in pixels
41 * \sa glPointSize().
42 */
43void GLAPIENTRY
44_mesa_PointSize( GLfloat size )
45{
46   GET_CURRENT_CONTEXT(ctx);
47   ASSERT_OUTSIDE_BEGIN_END(ctx);
48
49   if (size <= 0.0) {
50      _mesa_error( ctx, GL_INVALID_VALUE, "glPointSize" );
51      return;
52   }
53
54   if (ctx->Point.Size == size)
55      return;
56
57   FLUSH_VERTICES(ctx, _NEW_POINT);
58   ctx->Point.Size = size;
59
60   if (ctx->Driver.PointSize)
61      ctx->Driver.PointSize(ctx, size);
62}
63
64
65#if _HAVE_FULL_GL
66
67
68void GLAPIENTRY
69_mesa_PointParameteri( GLenum pname, GLint param )
70{
71   GLfloat p[3];
72   p[0] = (GLfloat) param;
73   p[1] = p[2] = 0.0F;
74   _mesa_PointParameterfv(pname, p);
75}
76
77
78void GLAPIENTRY
79_mesa_PointParameteriv( GLenum pname, const GLint *params )
80{
81   GLfloat p[3];
82   p[0] = (GLfloat) params[0];
83   if (pname == GL_DISTANCE_ATTENUATION_EXT) {
84      p[1] = (GLfloat) params[1];
85      p[2] = (GLfloat) params[2];
86   }
87   _mesa_PointParameterfv(pname, p);
88}
89
90
91void GLAPIENTRY
92_mesa_PointParameterf( GLenum pname, GLfloat param)
93{
94   GLfloat p[3];
95   p[0] = param;
96   p[1] = p[2] = 0.0F;
97   _mesa_PointParameterfv(pname, p);
98}
99
100
101void GLAPIENTRY
102_mesa_PointParameterfv( GLenum pname, const GLfloat *params)
103{
104   GET_CURRENT_CONTEXT(ctx);
105   ASSERT_OUTSIDE_BEGIN_END(ctx);
106
107   switch (pname) {
108      case GL_DISTANCE_ATTENUATION_EXT:
109         if (ctx->Extensions.EXT_point_parameters) {
110            if (TEST_EQ_3V(ctx->Point.Params, params))
111	       return;
112	    FLUSH_VERTICES(ctx, _NEW_POINT);
113            COPY_3V(ctx->Point.Params, params);
114            ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 ||
115                                      ctx->Point.Params[1] != 0.0 ||
116                                      ctx->Point.Params[2] != 0.0);
117
118            if (ctx->Point._Attenuated)
119               ctx->_TriangleCaps |= DD_POINT_ATTEN;
120            else
121               ctx->_TriangleCaps &= ~DD_POINT_ATTEN;
122         }
123         else {
124            _mesa_error(ctx, GL_INVALID_ENUM,
125                        "glPointParameterf[v]{EXT,ARB}(pname)");
126            return;
127         }
128         break;
129      case GL_POINT_SIZE_MIN_EXT:
130         if (ctx->Extensions.EXT_point_parameters) {
131            if (params[0] < 0.0F) {
132               _mesa_error( ctx, GL_INVALID_VALUE,
133                            "glPointParameterf[v]{EXT,ARB}(param)" );
134               return;
135            }
136            if (ctx->Point.MinSize == params[0])
137               return;
138            FLUSH_VERTICES(ctx, _NEW_POINT);
139            ctx->Point.MinSize = params[0];
140         }
141         else {
142            _mesa_error(ctx, GL_INVALID_ENUM,
143                        "glPointParameterf[v]{EXT,ARB}(pname)");
144            return;
145         }
146         break;
147      case GL_POINT_SIZE_MAX_EXT:
148         if (ctx->Extensions.EXT_point_parameters) {
149            if (params[0] < 0.0F) {
150               _mesa_error( ctx, GL_INVALID_VALUE,
151                            "glPointParameterf[v]{EXT,ARB}(param)" );
152               return;
153            }
154            if (ctx->Point.MaxSize == params[0])
155               return;
156            FLUSH_VERTICES(ctx, _NEW_POINT);
157            ctx->Point.MaxSize = params[0];
158         }
159         else {
160            _mesa_error(ctx, GL_INVALID_ENUM,
161                        "glPointParameterf[v]{EXT,ARB}(pname)");
162            return;
163         }
164         break;
165      case GL_POINT_FADE_THRESHOLD_SIZE_EXT:
166         if (ctx->Extensions.EXT_point_parameters) {
167            if (params[0] < 0.0F) {
168               _mesa_error( ctx, GL_INVALID_VALUE,
169                            "glPointParameterf[v]{EXT,ARB}(param)" );
170               return;
171            }
172            if (ctx->Point.Threshold == params[0])
173               return;
174            FLUSH_VERTICES(ctx, _NEW_POINT);
175            ctx->Point.Threshold = params[0];
176         }
177         else {
178            _mesa_error(ctx, GL_INVALID_ENUM,
179                        "glPointParameterf[v]{EXT,ARB}(pname)");
180            return;
181         }
182         break;
183      case GL_POINT_SPRITE_R_MODE_NV:
184         /* This is one area where ARB_point_sprite and NV_point_sprite
185	  * differ.  In ARB_point_sprite the POINT_SPRITE_R_MODE is
186	  * always ZERO.  NV_point_sprite adds the S and R modes.
187	  */
188         if (ctx->Extensions.NV_point_sprite) {
189            GLenum value = (GLenum) params[0];
190            if (value != GL_ZERO && value != GL_S && value != GL_R) {
191               _mesa_error(ctx, GL_INVALID_VALUE,
192                           "glPointParameterf[v]{EXT,ARB}(param)");
193               return;
194            }
195            if (ctx->Point.SpriteRMode == value)
196               return;
197            FLUSH_VERTICES(ctx, _NEW_POINT);
198            ctx->Point.SpriteRMode = value;
199         }
200         else {
201            _mesa_error(ctx, GL_INVALID_ENUM,
202                        "glPointParameterf[v]{EXT,ARB}(pname)");
203            return;
204         }
205         break;
206      case GL_POINT_SPRITE_COORD_ORIGIN:
207	 /* This is not completely correct.  GL_POINT_SPRITE_COORD_ORIGIN was
208	  * added to point sprites when the extension was merged into OpenGL
209	  * 2.0.  It is expected that an implementation supporting OpenGL 1.4
210	  * and GL_ARB_point_sprite will generate an error here.
211	  */
212         if (ctx->Extensions.ARB_point_sprite) {
213            GLenum value = (GLenum) params[0];
214            if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) {
215               _mesa_error(ctx, GL_INVALID_VALUE,
216                           "glPointParameterf[v]{EXT,ARB}(param)");
217               return;
218            }
219            if (ctx->Point.SpriteOrigin == value)
220               return;
221            FLUSH_VERTICES(ctx, _NEW_POINT);
222            ctx->Point.SpriteOrigin = value;
223         }
224         else {
225            _mesa_error(ctx, GL_INVALID_ENUM,
226                        "glPointParameterf[v]{EXT,ARB}(pname)");
227            return;
228         }
229         break;
230      default:
231         _mesa_error( ctx, GL_INVALID_ENUM,
232                      "glPointParameterf[v]{EXT,ARB}(pname)" );
233         return;
234   }
235
236   if (ctx->Driver.PointParameterfv)
237      (*ctx->Driver.PointParameterfv)(ctx, pname, params);
238}
239#endif
240
241
242
243/**
244 * Initialize the context point state.
245 *
246 * \param ctx GL context.
247 *
248 * Initializes __struct gl_contextRec::Point and point related constants in
249 * __struct gl_contextRec::Const.
250 */
251void
252_mesa_init_point(struct gl_context *ctx)
253{
254   GLuint i;
255
256   ctx->Point.SmoothFlag = GL_FALSE;
257   ctx->Point.Size = 1.0;
258   ctx->Point.Params[0] = 1.0;
259   ctx->Point.Params[1] = 0.0;
260   ctx->Point.Params[2] = 0.0;
261   ctx->Point._Attenuated = GL_FALSE;
262   ctx->Point.MinSize = 0.0;
263   ctx->Point.MaxSize
264      = MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA);
265   ctx->Point.Threshold = 1.0;
266   ctx->Point.PointSprite = GL_FALSE; /* GL_ARB/NV_point_sprite */
267   ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */
268   ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */
269   for (i = 0; i < Elements(ctx->Point.CoordReplace); i++) {
270      ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */
271   }
272}
273