src/mesa/main/context.h

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included
  14  * in all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  20  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  21  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  22  * OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /**
  27  * \file context.h
  28  * Mesa context and visual-related functions.
  29  *
  30  * There are three large Mesa data types/classes which are meant to be
  31  * used by device drivers:
  32  * - struct gl_context: this contains the Mesa rendering state
  33  * - struct gl_config:  this describes the color buffer (RGB vs. ci), whether
  34  *   or not there's a depth buffer, stencil buffer, etc.
  35  * - struct gl_framebuffer:  contains pointers to the depth buffer, stencil
  36  *   buffer, accum buffer and alpha buffers.
  37  *
  38  * These types should be encapsulated by corresponding device driver
  39  * data types.  See xmesa.h and xmesaP.h for an example.
  40  *
  41  * In OOP terms, struct gl_context, struct gl_config, and struct gl_framebuffer
  42  * are base classes which the device driver must derive from.
  43  *
  44  * The following functions create and destroy these data types.
  45  */
  46
  47
  48 #ifndef CONTEXT_H
  49 #define CONTEXT_H
  50
  51
  52 #include "errors.h"
  53 #include "imports.h"
  54 #include "extensions.h"
  55 #include "mtypes.h"
  56 #include "vbo/vbo.h"
  57
  58
  59 #ifdef __cplusplus
  60 extern "C" {
  61 #endif
  62
  63
  64 struct _glapi_table;
  65
  66
  67 /** \name Visual-related functions */
  68 /*@{*/
  69
  70 extern struct gl_config *
  71 _mesa_create_visual( GLboolean dbFlag,
  72                      GLboolean stereoFlag,
  73                      GLint redBits,
  74                      GLint greenBits,
  75                      GLint blueBits,
  76                      GLint alphaBits,
  77                      GLint depthBits,
  78                      GLint stencilBits,
  79                      GLint accumRedBits,
  80                      GLint accumGreenBits,
  81                      GLint accumBlueBits,
  82                      GLint accumAlphaBits,
  83                      GLuint numSamples );
  84
  85 extern GLboolean
  86 _mesa_initialize_visual( struct gl_config *v,
  87                          GLboolean dbFlag,
  88                          GLboolean stereoFlag,
  89                          GLint redBits,
  90                          GLint greenBits,
  91                          GLint blueBits,
  92                          GLint alphaBits,
  93                          GLint depthBits,
  94                          GLint stencilBits,
  95                          GLint accumRedBits,
  96                          GLint accumGreenBits,
  97                          GLint accumBlueBits,
  98                          GLint accumAlphaBits,
  99                          GLuint numSamples );
 100
 101 extern void
 102 _mesa_destroy_visual( struct gl_config *vis );
 103
 104 /*@}*/
 105
 106
 107 /** \name Context-related functions */
 108 /*@{*/
 109
 110 extern GLboolean
 111 _mesa_initialize_context( struct gl_context *ctx,
 112                           gl_api api,
 113                           const struct gl_config *visual,
 114                           struct gl_context *share_list,
 115                           const struct dd_function_table *driverFunctions);
 116
 117 extern void
 118 _mesa_free_context_data( struct gl_context *ctx );
 119
 120 extern void
 121 _mesa_destroy_context( struct gl_context *ctx );
 122
 123
 124 extern void
 125 _mesa_copy_context(const struct gl_context *src, struct gl_context *dst, GLuint mask);
 126
 127 extern GLboolean
 128 _mesa_make_current( struct gl_context *ctx, struct gl_framebuffer *drawBuffer,
 129                     struct gl_framebuffer *readBuffer );
 130
 131 extern GLboolean
 132 _mesa_share_state(struct gl_context *ctx, struct gl_context *ctxToShare);
 133
 134 extern struct gl_context *
 135 _mesa_get_current_context(void);
 136
 137 /*@}*/
 138
 139 extern void
 140 _mesa_init_constants(struct gl_constants *consts, gl_api api);
 141
 142 extern void
 143 _mesa_notifySwapBuffers(struct gl_context *gc);
 144
 145
 146 extern struct _glapi_table *
 147 _mesa_get_dispatch(struct gl_context *ctx);
 148
 149 extern void
 150 _mesa_set_context_lost_dispatch(struct gl_context *ctx);
 151
 152
 153
 154 /** \name Miscellaneous */
 155 /*@{*/
 156
 157 extern void
 158 _mesa_flush(struct gl_context *ctx);
 159
 160 extern void GLAPIENTRY
 161 _mesa_Finish( void );
 162
 163 extern void GLAPIENTRY
 164 _mesa_Flush( void );
 165
 166 /*@}*/
 167
 168
 169 /**
 170  * Are we currently between glBegin and glEnd?
 171  * During execution, not display list compilation.
 172  */
 173 static inline GLboolean
 174 _mesa_inside_begin_end(const struct gl_context *ctx)
 175 {
 176    return ctx->Driver.CurrentExecPrimitive != PRIM_OUTSIDE_BEGIN_END;
 177 }
 178
 179
 180 /**
 181  * Are we currently between glBegin and glEnd in a display list?
 182  */
 183 static inline GLboolean
 184 _mesa_inside_dlist_begin_end(const struct gl_context *ctx)
 185 {
 186    return ctx->Driver.CurrentSavePrimitive <= PRIM_MAX;
 187 }
 188
 189
 190
 191 /**
 192  * \name Macros for flushing buffered rendering commands before state changes,
 193  * checking if inside glBegin/glEnd, etc.
 194  */
 195 /*@{*/
 196
 197 /**
 198  * Flush vertices.
 199  *
 200  * \param ctx GL context.
 201  * \param newstate new state.
 202  *
 203  * Checks if dd_function_table::NeedFlush is marked to flush stored vertices,
 204  * and calls dd_function_table::FlushVertices if so. Marks
 205  * __struct gl_contextRec::NewState with \p newstate.
 206  */
 207 #define FLUSH_VERTICES(ctx, newstate)                           \
 208 do {                                                            \
 209    if (MESA_VERBOSE & VERBOSE_STATE)                            \
 210       _mesa_debug(ctx, "FLUSH_VERTICES in %s\n", __func__);     \
 211    if (ctx->Driver.NeedFlush & FLUSH_STORED_VERTICES)           \
 212       vbo_exec_FlushVertices(ctx, FLUSH_STORED_VERTICES);       \
 213    ctx->NewState |= newstate;                                   \
 214 } while (0)
 215
 216 /**
 217  * Flush current state.
 218  *
 219  * \param ctx GL context.
 220  * \param newstate new state.
 221  *
 222  * Checks if dd_function_table::NeedFlush is marked to flush current state,
 223  * and calls dd_function_table::FlushVertices if so. Marks
 224  * __struct gl_contextRec::NewState with \p newstate.
 225  */
 226 #define FLUSH_CURRENT(ctx, newstate)                            \
 227 do {                                                            \
 228    if (MESA_VERBOSE & VERBOSE_STATE)                            \
 229       _mesa_debug(ctx, "FLUSH_CURRENT in %s\n", __func__);      \
 230    if (ctx->Driver.NeedFlush & FLUSH_UPDATE_CURRENT)            \
 231       vbo_exec_FlushVertices(ctx, FLUSH_UPDATE_CURRENT);        \
 232    ctx->NewState |= newstate;                                   \
 233 } while (0)
 234
 235 /**
 236  * Macro to assert that the API call was made outside the
 237  * glBegin()/glEnd() pair, with return value.
 238  *
 239  * \param ctx GL context.
 240  * \param retval value to return in case the assertion fails.
 241  */
 242 #define ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, retval)               \
 243 do {                                                                    \
 244    if (_mesa_inside_begin_end(ctx)) {                                   \
 245       _mesa_error(ctx, GL_INVALID_OPERATION, "Inside glBegin/glEnd");   \
 246       return retval;                                                    \
 247    }                                                                    \
 248 } while (0)
 249
 250 /**
 251  * Macro to assert that the API call was made outside the
 252  * glBegin()/glEnd() pair.
 253  *
 254  * \param ctx GL context.
 255  */
 256 #define ASSERT_OUTSIDE_BEGIN_END(ctx)                                   \
 257 do {                                                                    \
 258    if (_mesa_inside_begin_end(ctx)) {                                   \
 259       _mesa_error(ctx, GL_INVALID_OPERATION, "Inside glBegin/glEnd");   \
 260       return;                                                           \
 261    }                                                                    \
 262 } while (0)
 263
 264 /*@}*/
 265
 266
 267 /**
 268  * Checks if the context is for Desktop GL (Compatibility or Core)
 269  */
 270 static inline bool
 271 _mesa_is_desktop_gl(const struct gl_context *ctx)
 272 {
 273    return ctx->API == API_OPENGL_COMPAT || ctx->API == API_OPENGL_CORE;
 274 }
 275
 276
 277 /**
 278  * Checks if the context is for any GLES version
 279  */
 280 static inline bool
 281 _mesa_is_gles(const struct gl_context *ctx)
 282 {
 283    return ctx->API == API_OPENGLES || ctx->API == API_OPENGLES2;
 284 }
 285
 286
 287 /**
 288  * Checks if the context is for GLES 3.0 or later
 289  */
 290 static inline bool
 291 _mesa_is_gles3(const struct gl_context *ctx)
 292 {
 293    return ctx->API == API_OPENGLES2 && ctx->Version >= 30;
 294 }
 295
 296
 297 /**
 298  * Checks if the context is for GLES 3.1 or later
 299  */
 300 static inline bool
 301 _mesa_is_gles31(const struct gl_context *ctx)
 302 {
 303    return ctx->API == API_OPENGLES2 && ctx->Version >= 31;
 304 }
 305
 306
 307 /**
 308  * Checks if the context is for GLES 3.2 or later
 309  */
 310 static inline bool
 311 _mesa_is_gles32(const struct gl_context *ctx)
 312 {
 313    return ctx->API == API_OPENGLES2 && ctx->Version >= 32;
 314 }
 315
 316
 317 static inline bool
 318 _mesa_is_no_error_enabled(const struct gl_context *ctx)
 319 {
 320    return ctx->Const.ContextFlags & GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR;
 321 }
 322
 323
 324 /**
 325  * Checks if the context supports geometry shaders.
 326  */
 327 static inline bool
 328 _mesa_has_geometry_shaders(const struct gl_context *ctx)
 329 {
 330    return _mesa_has_OES_geometry_shader(ctx) ||
 331           (_mesa_is_desktop_gl(ctx) && ctx->Version >= 32);
 332 }
 333
 334
 335 /**
 336  * Checks if the context supports compute shaders.
 337  */
 338 static inline bool
 339 _mesa_has_compute_shaders(const struct gl_context *ctx)
 340 {
 341    return _mesa_has_ARB_compute_shader(ctx) ||
 342       (ctx->API == API_OPENGLES2 && ctx->Version >= 31);
 343 }
 344
 345 /**
 346  * Checks if the context supports tessellation.
 347  */
 348 static inline GLboolean
 349 _mesa_has_tessellation(const struct gl_context *ctx)
 350 {
 351    /* _mesa_has_EXT_tessellation_shader(ctx) is redundant with the OES
 352     * check, so don't bother calling it.
 353     */
 354    return _mesa_has_OES_tessellation_shader(ctx) ||
 355           _mesa_has_ARB_tessellation_shader(ctx);
 356 }
 357
 358 static inline bool
 359 _mesa_has_texture_cube_map_array(const struct gl_context *ctx)
 360 {
 361    return _mesa_has_ARB_texture_cube_map_array(ctx) ||
 362           _mesa_has_OES_texture_cube_map_array(ctx);
 363 }
 364
 365 #ifdef __cplusplus
 366 }
 367 #endif
 368
 369
 370 #endif /* CONTEXT_H */