7 * Mesa 3-D graphics library
10 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
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:
19 * The above copyright notice and this permission notice shall be included
20 * in all copies or substantial portions of the Software.
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.
39 * Set current point size.
40 * \param size point diameter in pixels
44 _mesa_PointSize( GLfloat size
)
46 GET_CURRENT_CONTEXT(ctx
);
49 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPointSize" );
53 if (ctx
->Point
.Size
== size
)
56 FLUSH_VERTICES(ctx
, _NEW_POINT
);
57 ctx
->Point
.Size
= size
;
59 if (ctx
->Driver
.PointSize
)
60 ctx
->Driver
.PointSize(ctx
, size
);
65 _mesa_PointParameteri( GLenum pname
, GLint param
)
68 p
[0] = (GLfloat
) param
;
70 _mesa_PointParameterfv(pname
, p
);
75 _mesa_PointParameteriv( GLenum pname
, const GLint
*params
)
78 p
[0] = (GLfloat
) params
[0];
79 if (pname
== GL_DISTANCE_ATTENUATION_EXT
) {
80 p
[1] = (GLfloat
) params
[1];
81 p
[2] = (GLfloat
) params
[2];
83 _mesa_PointParameterfv(pname
, p
);
88 _mesa_PointParameterf( GLenum pname
, GLfloat param
)
93 _mesa_PointParameterfv(pname
, p
);
98 _mesa_PointParameterfv( GLenum pname
, const GLfloat
*params
)
100 GET_CURRENT_CONTEXT(ctx
);
102 /* Drivers that support point sprites must also support point parameters.
103 * If point parameters aren't supported, then this function shouldn't even
106 ASSERT(!(ctx
->Extensions
.ARB_point_sprite
107 || ctx
->Extensions
.NV_point_sprite
)
108 || ctx
->Extensions
.EXT_point_parameters
);
110 if (!ctx
->Extensions
.EXT_point_parameters
) {
111 _mesa_error(ctx
, GL_INVALID_OPERATION
,
112 "unsupported function called (unsupported extension)");
117 case GL_DISTANCE_ATTENUATION_EXT
:
118 if (TEST_EQ_3V(ctx
->Point
.Params
, params
))
120 FLUSH_VERTICES(ctx
, _NEW_POINT
);
121 COPY_3V(ctx
->Point
.Params
, params
);
122 ctx
->Point
._Attenuated
= (ctx
->Point
.Params
[0] != 1.0 ||
123 ctx
->Point
.Params
[1] != 0.0 ||
124 ctx
->Point
.Params
[2] != 0.0);
126 if (ctx
->Point
._Attenuated
)
127 ctx
->_TriangleCaps
|= DD_POINT_ATTEN
;
129 ctx
->_TriangleCaps
&= ~DD_POINT_ATTEN
;
131 case GL_POINT_SIZE_MIN_EXT
:
132 if (params
[0] < 0.0F
) {
133 _mesa_error( ctx
, GL_INVALID_VALUE
,
134 "glPointParameterf[v]{EXT,ARB}(param)" );
137 if (ctx
->Point
.MinSize
== params
[0])
139 FLUSH_VERTICES(ctx
, _NEW_POINT
);
140 ctx
->Point
.MinSize
= params
[0];
142 case GL_POINT_SIZE_MAX_EXT
:
143 if (params
[0] < 0.0F
) {
144 _mesa_error( ctx
, GL_INVALID_VALUE
,
145 "glPointParameterf[v]{EXT,ARB}(param)" );
148 if (ctx
->Point
.MaxSize
== params
[0])
150 FLUSH_VERTICES(ctx
, _NEW_POINT
);
151 ctx
->Point
.MaxSize
= params
[0];
153 case GL_POINT_FADE_THRESHOLD_SIZE_EXT
:
154 if (params
[0] < 0.0F
) {
155 _mesa_error( ctx
, GL_INVALID_VALUE
,
156 "glPointParameterf[v]{EXT,ARB}(param)" );
159 if (ctx
->Point
.Threshold
== params
[0])
161 FLUSH_VERTICES(ctx
, _NEW_POINT
);
162 ctx
->Point
.Threshold
= params
[0];
164 case GL_POINT_SPRITE_R_MODE_NV
:
165 /* This is one area where ARB_point_sprite and NV_point_sprite
166 * differ. In ARB_point_sprite the POINT_SPRITE_R_MODE is
167 * always ZERO. NV_point_sprite adds the S and R modes.
169 if (_mesa_is_desktop_gl(ctx
) && ctx
->Extensions
.NV_point_sprite
) {
170 GLenum value
= (GLenum
) params
[0];
171 if (value
!= GL_ZERO
&& value
!= GL_S
&& value
!= GL_R
) {
172 _mesa_error(ctx
, GL_INVALID_VALUE
,
173 "glPointParameterf[v]{EXT,ARB}(param)");
176 if (ctx
->Point
.SpriteRMode
== value
)
178 FLUSH_VERTICES(ctx
, _NEW_POINT
);
179 ctx
->Point
.SpriteRMode
= value
;
182 _mesa_error(ctx
, GL_INVALID_ENUM
,
183 "glPointParameterf[v]{EXT,ARB}(pname)");
187 case GL_POINT_SPRITE_COORD_ORIGIN
:
188 /* GL_POINT_SPRITE_COORD_ORIGIN was added to point sprites when the
189 * extension was merged into OpenGL 2.0.
191 if ((ctx
->API
== API_OPENGL_COMPAT
&& ctx
->Version
>= 20)
192 || ctx
->API
== API_OPENGL_CORE
) {
193 GLenum value
= (GLenum
) params
[0];
194 if (value
!= GL_LOWER_LEFT
&& value
!= GL_UPPER_LEFT
) {
195 _mesa_error(ctx
, GL_INVALID_VALUE
,
196 "glPointParameterf[v]{EXT,ARB}(param)");
199 if (ctx
->Point
.SpriteOrigin
== value
)
201 FLUSH_VERTICES(ctx
, _NEW_POINT
);
202 ctx
->Point
.SpriteOrigin
= value
;
205 _mesa_error(ctx
, GL_INVALID_ENUM
,
206 "glPointParameterf[v]{EXT,ARB}(pname)");
211 _mesa_error( ctx
, GL_INVALID_ENUM
,
212 "glPointParameterf[v]{EXT,ARB}(pname)" );
216 if (ctx
->Driver
.PointParameterfv
)
217 (*ctx
->Driver
.PointParameterfv
)(ctx
, pname
, params
);
223 * Initialize the context point state.
225 * \param ctx GL context.
227 * Initializes __struct gl_contextRec::Point and point related constants in
228 * __struct gl_contextRec::Const.
231 _mesa_init_point(struct gl_context
*ctx
)
235 ctx
->Point
.SmoothFlag
= GL_FALSE
;
236 ctx
->Point
.Size
= 1.0;
237 ctx
->Point
.Params
[0] = 1.0;
238 ctx
->Point
.Params
[1] = 0.0;
239 ctx
->Point
.Params
[2] = 0.0;
240 ctx
->Point
._Attenuated
= GL_FALSE
;
241 ctx
->Point
.MinSize
= 0.0;
243 = MAX2(ctx
->Const
.MaxPointSize
, ctx
->Const
.MaxPointSizeAA
);
244 ctx
->Point
.Threshold
= 1.0;
246 /* Page 403 (page 423 of the PDF) of the OpenGL 3.0 spec says:
248 * "Non-sprite points (section 3.4) - Enable/Disable targets
249 * POINT_SMOOTH and POINT_SPRITE, and all associated state. Point
250 * rasterization is always performed as though POINT_SPRITE were
253 * In a core context, the state will default to true, and the setters and
254 * getters are disabled.
256 ctx
->Point
.PointSprite
= (ctx
->API
== API_OPENGL_CORE
);
258 ctx
->Point
.SpriteRMode
= GL_ZERO
; /* GL_NV_point_sprite (only!) */
259 ctx
->Point
.SpriteOrigin
= GL_UPPER_LEFT
; /* GL_ARB_point_sprite */
260 for (i
= 0; i
< Elements(ctx
->Point
.CoordReplace
); i
++) {
261 ctx
->Point
.CoordReplace
[i
] = GL_FALSE
; /* GL_ARB/NV_point_sprite */