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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
26 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
27 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
28 * OTHER DEALINGS IN THE SOFTWARE.
40 * Set current point size.
41 * \param size point diameter in pixels
45 _mesa_PointSize( GLfloat size
)
47 GET_CURRENT_CONTEXT(ctx
);
50 _mesa_error( ctx
, GL_INVALID_VALUE
, "glPointSize" );
54 if (ctx
->Point
.Size
== size
)
57 FLUSH_VERTICES(ctx
, _NEW_POINT
);
58 ctx
->Point
.Size
= size
;
60 if (ctx
->Driver
.PointSize
)
61 ctx
->Driver
.PointSize(ctx
, size
);
66 _mesa_PointParameteri( GLenum pname
, GLint param
)
69 p
[0] = (GLfloat
) param
;
71 _mesa_PointParameterfv(pname
, p
);
76 _mesa_PointParameteriv( GLenum pname
, const GLint
*params
)
79 p
[0] = (GLfloat
) params
[0];
80 if (pname
== GL_DISTANCE_ATTENUATION_EXT
) {
81 p
[1] = (GLfloat
) params
[1];
82 p
[2] = (GLfloat
) params
[2];
84 _mesa_PointParameterfv(pname
, p
);
89 _mesa_PointParameterf( GLenum pname
, GLfloat param
)
94 _mesa_PointParameterfv(pname
, p
);
99 _mesa_PointParameterfv( GLenum pname
, const GLfloat
*params
)
101 GET_CURRENT_CONTEXT(ctx
);
103 /* Drivers that support point sprites must also support point parameters.
104 * If point parameters aren't supported, then this function shouldn't even
107 ASSERT(!(ctx
->Extensions
.ARB_point_sprite
108 || ctx
->Extensions
.NV_point_sprite
)
109 || ctx
->Extensions
.EXT_point_parameters
);
111 if (!ctx
->Extensions
.EXT_point_parameters
) {
112 _mesa_error(ctx
, GL_INVALID_OPERATION
,
113 "unsupported function called (unsupported extension)");
118 case GL_DISTANCE_ATTENUATION_EXT
:
119 if (TEST_EQ_3V(ctx
->Point
.Params
, params
))
121 FLUSH_VERTICES(ctx
, _NEW_POINT
);
122 COPY_3V(ctx
->Point
.Params
, params
);
123 ctx
->Point
._Attenuated
= (ctx
->Point
.Params
[0] != 1.0 ||
124 ctx
->Point
.Params
[1] != 0.0 ||
125 ctx
->Point
.Params
[2] != 0.0);
127 case GL_POINT_SIZE_MIN_EXT
:
128 if (params
[0] < 0.0F
) {
129 _mesa_error( ctx
, GL_INVALID_VALUE
,
130 "glPointParameterf[v]{EXT,ARB}(param)" );
133 if (ctx
->Point
.MinSize
== params
[0])
135 FLUSH_VERTICES(ctx
, _NEW_POINT
);
136 ctx
->Point
.MinSize
= params
[0];
138 case GL_POINT_SIZE_MAX_EXT
:
139 if (params
[0] < 0.0F
) {
140 _mesa_error( ctx
, GL_INVALID_VALUE
,
141 "glPointParameterf[v]{EXT,ARB}(param)" );
144 if (ctx
->Point
.MaxSize
== params
[0])
146 FLUSH_VERTICES(ctx
, _NEW_POINT
);
147 ctx
->Point
.MaxSize
= params
[0];
149 case GL_POINT_FADE_THRESHOLD_SIZE_EXT
:
150 if (params
[0] < 0.0F
) {
151 _mesa_error( ctx
, GL_INVALID_VALUE
,
152 "glPointParameterf[v]{EXT,ARB}(param)" );
155 if (ctx
->Point
.Threshold
== params
[0])
157 FLUSH_VERTICES(ctx
, _NEW_POINT
);
158 ctx
->Point
.Threshold
= params
[0];
160 case GL_POINT_SPRITE_R_MODE_NV
:
161 /* This is one area where ARB_point_sprite and NV_point_sprite
162 * differ. In ARB_point_sprite the POINT_SPRITE_R_MODE is
163 * always ZERO. NV_point_sprite adds the S and R modes.
165 if (_mesa_is_desktop_gl(ctx
) && ctx
->Extensions
.NV_point_sprite
) {
166 GLenum value
= (GLenum
) params
[0];
167 if (value
!= GL_ZERO
&& value
!= GL_S
&& value
!= GL_R
) {
168 _mesa_error(ctx
, GL_INVALID_VALUE
,
169 "glPointParameterf[v]{EXT,ARB}(param)");
172 if (ctx
->Point
.SpriteRMode
== value
)
174 FLUSH_VERTICES(ctx
, _NEW_POINT
);
175 ctx
->Point
.SpriteRMode
= value
;
178 _mesa_error(ctx
, GL_INVALID_ENUM
,
179 "glPointParameterf[v]{EXT,ARB}(pname)");
183 case GL_POINT_SPRITE_COORD_ORIGIN
:
184 /* GL_POINT_SPRITE_COORD_ORIGIN was added to point sprites when the
185 * extension was merged into OpenGL 2.0.
187 if ((ctx
->API
== API_OPENGL_COMPAT
&& ctx
->Version
>= 20)
188 || ctx
->API
== API_OPENGL_CORE
) {
189 GLenum value
= (GLenum
) params
[0];
190 if (value
!= GL_LOWER_LEFT
&& value
!= GL_UPPER_LEFT
) {
191 _mesa_error(ctx
, GL_INVALID_VALUE
,
192 "glPointParameterf[v]{EXT,ARB}(param)");
195 if (ctx
->Point
.SpriteOrigin
== value
)
197 FLUSH_VERTICES(ctx
, _NEW_POINT
);
198 ctx
->Point
.SpriteOrigin
= value
;
201 _mesa_error(ctx
, GL_INVALID_ENUM
,
202 "glPointParameterf[v]{EXT,ARB}(pname)");
207 _mesa_error( ctx
, GL_INVALID_ENUM
,
208 "glPointParameterf[v]{EXT,ARB}(pname)" );
212 if (ctx
->Driver
.PointParameterfv
)
213 (*ctx
->Driver
.PointParameterfv
)(ctx
, pname
, params
);
219 * Initialize the context point state.
221 * \param ctx GL context.
223 * Initializes __struct gl_contextRec::Point and point related constants in
224 * __struct gl_contextRec::Const.
227 _mesa_init_point(struct gl_context
*ctx
)
231 ctx
->Point
.SmoothFlag
= GL_FALSE
;
232 ctx
->Point
.Size
= 1.0;
233 ctx
->Point
.Params
[0] = 1.0;
234 ctx
->Point
.Params
[1] = 0.0;
235 ctx
->Point
.Params
[2] = 0.0;
236 ctx
->Point
._Attenuated
= GL_FALSE
;
237 ctx
->Point
.MinSize
= 0.0;
239 = MAX2(ctx
->Const
.MaxPointSize
, ctx
->Const
.MaxPointSizeAA
);
240 ctx
->Point
.Threshold
= 1.0;
242 /* Page 403 (page 423 of the PDF) of the OpenGL 3.0 spec says:
244 * "Non-sprite points (section 3.4) - Enable/Disable targets
245 * POINT_SMOOTH and POINT_SPRITE, and all associated state. Point
246 * rasterization is always performed as though POINT_SPRITE were
249 * In a core context, the state will default to true, and the setters and
250 * getters are disabled.
252 ctx
->Point
.PointSprite
= (ctx
->API
== API_OPENGL_CORE
||
253 ctx
->API
== API_OPENGLES2
);
255 ctx
->Point
.SpriteRMode
= GL_ZERO
; /* GL_NV_point_sprite (only!) */
256 ctx
->Point
.SpriteOrigin
= GL_UPPER_LEFT
; /* GL_ARB_point_sprite */
257 for (i
= 0; i
< Elements(ctx
->Point
.CoordReplace
); i
++) {
258 ctx
->Point
.CoordReplace
[i
] = GL_FALSE
; /* GL_ARB/NV_point_sprite */