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 */ 43 void 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 68 void 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 78 void 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 91 void 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 } 99 100 101 void GLAPIENTRY 102 _mesa_PointParameterfv( GLenum pname, const GLfloat *params) 103 { 104 GET_CURRENT_CONTEXT(ctx); 105 ASSERT_OUTSIDE_BEGIN_END(ctx); 106 107 /* Drivers that support point sprites must also support point parameters. 108 * If point parameters aren't supported, then this function shouldn't even 109 * exist. 110 */ 111 ASSERT(!(ctx->Extensions.ARB_point_sprite 112 || ctx->Extensions.NV_point_sprite) 113 || ctx->Extensions.EXT_point_parameters); 114 115 if (!ctx->Extensions.EXT_point_parameters) { 116 _mesa_error(ctx, GL_INVALID_OPERATION, 117 "unsupported function called (unsupported extension)"); 118 return; 119 } 120 121 switch (pname) { 122 case GL_DISTANCE_ATTENUATION_EXT: 123 if (TEST_EQ_3V(ctx->Point.Params, params)) 124 return; 125 FLUSH_VERTICES(ctx, _NEW_POINT); 126 COPY_3V(ctx->Point.Params, params); 127 ctx->Point._Attenuated = (ctx->Point.Params[0] != 1.0 || 128 ctx->Point.Params[1] != 0.0 || 129 ctx->Point.Params[2] != 0.0); 130 131 if (ctx->Point._Attenuated) 132 ctx->_TriangleCaps |= DD_POINT_ATTEN; 133 else 134 ctx->_TriangleCaps &= ~DD_POINT_ATTEN; 135 break; 136 case GL_POINT_SIZE_MIN_EXT: 137 if (params[0] < 0.0F) { 138 _mesa_error( ctx, GL_INVALID_VALUE, 139 "glPointParameterf[v]{EXT,ARB}(param)" ); 140 return; 141 } 142 if (ctx->Point.MinSize == params[0]) 143 return; 144 FLUSH_VERTICES(ctx, _NEW_POINT); 145 ctx->Point.MinSize = params[0]; 146 break; 147 case GL_POINT_SIZE_MAX_EXT: 148 if (params[0] < 0.0F) { 149 _mesa_error( ctx, GL_INVALID_VALUE, 150 "glPointParameterf[v]{EXT,ARB}(param)" ); 151 return; 152 } 153 if (ctx->Point.MaxSize == params[0]) 154 return; 155 FLUSH_VERTICES(ctx, _NEW_POINT); 156 ctx->Point.MaxSize = params[0]; 157 break; 158 case GL_POINT_FADE_THRESHOLD_SIZE_EXT: 159 if (params[0] < 0.0F) { 160 _mesa_error( ctx, GL_INVALID_VALUE, 161 "glPointParameterf[v]{EXT,ARB}(param)" ); 162 return; 163 } 164 if (ctx->Point.Threshold == params[0]) 165 return; 166 FLUSH_VERTICES(ctx, _NEW_POINT); 167 ctx->Point.Threshold = params[0]; 168 break; 169 case GL_POINT_SPRITE_R_MODE_NV: 170 /* This is one area where ARB_point_sprite and NV_point_sprite 171 * differ. In ARB_point_sprite the POINT_SPRITE_R_MODE is 172 * always ZERO. NV_point_sprite adds the S and R modes. 173 */ 174 if (_mesa_is_desktop_gl(ctx) && ctx->Extensions.NV_point_sprite) { 175 GLenum value = (GLenum) params[0]; 176 if (value != GL_ZERO && value != GL_S && value != GL_R) { 177 _mesa_error(ctx, GL_INVALID_VALUE, 178 "glPointParameterf[v]{EXT,ARB}(param)"); 179 return; 180 } 181 if (ctx->Point.SpriteRMode == value) 182 return; 183 FLUSH_VERTICES(ctx, _NEW_POINT); 184 ctx->Point.SpriteRMode = value; 185 } 186 else { 187 _mesa_error(ctx, GL_INVALID_ENUM, 188 "glPointParameterf[v]{EXT,ARB}(pname)"); 189 return; 190 } 191 break; 192 case GL_POINT_SPRITE_COORD_ORIGIN: 193 /* GL_POINT_SPRITE_COORD_ORIGIN was added to point sprites when the 194 * extension was merged into OpenGL 2.0. 195 */ 196 if ((ctx->API == API_OPENGL && ctx->Version >= 20) 197 || ctx->API == API_OPENGL_CORE) { 198 GLenum value = (GLenum) params[0]; 199 if (value != GL_LOWER_LEFT && value != GL_UPPER_LEFT) { 200 _mesa_error(ctx, GL_INVALID_VALUE, 201 "glPointParameterf[v]{EXT,ARB}(param)"); 202 return; 203 } 204 if (ctx->Point.SpriteOrigin == value) 205 return; 206 FLUSH_VERTICES(ctx, _NEW_POINT); 207 ctx->Point.SpriteOrigin = value; 208 } 209 else { 210 _mesa_error(ctx, GL_INVALID_ENUM, 211 "glPointParameterf[v]{EXT,ARB}(pname)"); 212 return; 213 } 214 break; 215 default: 216 _mesa_error( ctx, GL_INVALID_ENUM, 217 "glPointParameterf[v]{EXT,ARB}(pname)" ); 218 return; 219 } 220 221 if (ctx->Driver.PointParameterfv) 222 (*ctx->Driver.PointParameterfv)(ctx, pname, params); 223 } 224 #endif 225 226 227 228 /** 229 * Initialize the context point state. 230 * 231 * \param ctx GL context. 232 * 233 * Initializes __struct gl_contextRec::Point and point related constants in 234 * __struct gl_contextRec::Const. 235 */ 236 void 237 _mesa_init_point(struct gl_context *ctx) 238 { 239 GLuint i; 240 241 ctx->Point.SmoothFlag = GL_FALSE; 242 ctx->Point.Size = 1.0; 243 ctx->Point.Params[0] = 1.0; 244 ctx->Point.Params[1] = 0.0; 245 ctx->Point.Params[2] = 0.0; 246 ctx->Point._Attenuated = GL_FALSE; 247 ctx->Point.MinSize = 0.0; 248 ctx->Point.MaxSize 249 = MAX2(ctx->Const.MaxPointSize, ctx->Const.MaxPointSizeAA); 250 ctx->Point.Threshold = 1.0; 251 252 /* Page 403 (page 423 of the PDF) of the OpenGL 3.0 spec says: 253 * 254 * "Non-sprite points (section 3.4) - Enable/Disable targets 255 * POINT_SMOOTH and POINT_SPRITE, and all associated state. Point 256 * rasterization is always performed as though POINT_SPRITE were 257 * enabled." 258 * 259 * In a core context, the state will default to true, and the setters and 260 * getters are disabled. 261 */ 262 ctx->Point.PointSprite = (ctx->API == API_OPENGL_CORE); 263 264 ctx->Point.SpriteRMode = GL_ZERO; /* GL_NV_point_sprite (only!) */ 265 ctx->Point.SpriteOrigin = GL_UPPER_LEFT; /* GL_ARB_point_sprite */ 266 for (i = 0; i < Elements(ctx->Point.CoordReplace); i++) { 267 ctx->Point.CoordReplace[i] = GL_FALSE; /* GL_ARB/NV_point_sprite */ 268 } 269 } 270
