src/mesa/main/context.h

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5.1
   4  *
   5  * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR 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 or not
  34  *   there's a depth buffer, stencil buffer, etc.
  35  * - struct gl_framebuffer:  contains pointers to the depth buffer, stencil buffer,
  36  *   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 are base classes
  42  * 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 "imports.h"
  53 #include "mtypes.h"
  54
  55
  56 struct _glapi_table;
  57
  58
  59 /** \name Visual-related functions */
  60 /*@{*/
  61
  62 extern struct gl_config *
  63 _mesa_create_visual( GLboolean dbFlag,
  64                      GLboolean stereoFlag,
  65                      GLint redBits,
  66                      GLint greenBits,
  67                      GLint blueBits,
  68                      GLint alphaBits,
  69                      GLint depthBits,
  70                      GLint stencilBits,
  71                      GLint accumRedBits,
  72                      GLint accumGreenBits,
  73                      GLint accumBlueBits,
  74                      GLint accumAlphaBits,
  75                      GLint numSamples );
  76
  77 extern GLboolean
  78 _mesa_initialize_visual( struct gl_config *v,
  79                          GLboolean dbFlag,
  80                          GLboolean stereoFlag,
  81                          GLint redBits,
  82                          GLint greenBits,
  83                          GLint blueBits,
  84                          GLint alphaBits,
  85                          GLint depthBits,
  86                          GLint stencilBits,
  87                          GLint accumRedBits,
  88                          GLint accumGreenBits,
  89                          GLint accumBlueBits,
  90                          GLint accumAlphaBits,
  91                          GLint numSamples );
  92
  93 extern void
  94 _mesa_destroy_visual( struct gl_config *vis );
  95
  96 /*@}*/
  97
  98
  99 /** \name Context-related functions */
 100 /*@{*/
 101
 102 extern GLboolean
 103 _mesa_initialize_context( struct gl_context *ctx,
 104                           gl_api api,
 105                           const struct gl_config *visual,
 106                           struct gl_context *share_list,
 107                           const struct dd_function_table *driverFunctions,
 108                           void *driverContext );
 109
 110 extern struct gl_context *
 111 _mesa_create_context(gl_api api,
 112                      const struct gl_config *visual,
 113                      struct gl_context *share_list,
 114                      const struct dd_function_table *driverFunctions,
 115                      void *driverContext);
 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
 128 extern void
 129 _mesa_check_init_viewport(struct gl_context *ctx, GLuint width, GLuint height);
 130
 131 extern GLboolean
 132 _mesa_make_current( struct gl_context *ctx, struct gl_framebuffer *drawBuffer,
 133                     struct gl_framebuffer *readBuffer );
 134
 135 extern GLboolean
 136 _mesa_share_state(struct gl_context *ctx, struct gl_context *ctxToShare);
 137
 138 extern struct gl_context *
 139 _mesa_get_current_context(void);
 140
 141 /*@}*/
 142
 143 extern void
 144 _mesa_init_get_hash(struct gl_context *ctx);
 145
 146 extern void
 147 _mesa_notifySwapBuffers(struct gl_context *gc);
 148
 149
 150 extern struct _glapi_table *
 151 _mesa_get_dispatch(struct gl_context *ctx);
 152
 153
 154 void
 155 _mesa_set_mvp_with_dp4( struct gl_context *ctx,
 156                         GLboolean flag );
 157
 158
 159 extern GLboolean
 160 _mesa_valid_to_render(struct gl_context *ctx, const char *where);
 161
 162
 163
 164 /** \name Miscellaneous */
 165 /*@{*/
 166
 167 extern void
 168 _mesa_record_error( struct gl_context *ctx, GLenum error );
 169
 170
 171 extern void
 172 _mesa_finish(struct gl_context *ctx);
 173
 174 extern void
 175 _mesa_flush(struct gl_context *ctx);
 176
 177
 178 extern void GLAPIENTRY
 179 _mesa_Finish( void );
 180
 181 extern void GLAPIENTRY
 182 _mesa_Flush( void );
 183
 184 /*@}*/
 185
 186
 187 /**
 188  * \name Macros for flushing buffered rendering commands before state changes,
 189  * checking if inside glBegin/glEnd, etc.
 190  */
 191 /*@{*/
 192
 193 /**
 194  * Flush vertices.
 195  *
 196  * \param ctx GL context.
 197  * \param newstate new state.
 198  *
 199  * Checks if dd_function_table::NeedFlush is marked to flush stored vertices,
 200  * and calls dd_function_table::FlushVertices if so. Marks
 201  * __struct gl_contextRec::NewState with \p newstate.
 202  */
 203 #define FLUSH_VERTICES(ctx, newstate)                           \
 204 do {                                                            \
 205    if (MESA_VERBOSE & VERBOSE_STATE)                            \
 206       _mesa_debug(ctx, "FLUSH_VERTICES in %s\n", MESA_FUNCTION);\
 207    if (ctx->Driver.NeedFlush & FLUSH_STORED_VERTICES)           \
 208       ctx->Driver.FlushVertices(ctx, FLUSH_STORED_VERTICES);    \
 209    ctx->NewState |= newstate;                                   \
 210 } while (0)
 211
 212 /**
 213  * Flush current state.
 214  *
 215  * \param ctx GL context.
 216  * \param newstate new state.
 217  *
 218  * Checks if dd_function_table::NeedFlush is marked to flush current state,
 219  * and calls dd_function_table::FlushVertices if so. Marks
 220  * __struct gl_contextRec::NewState with \p newstate.
 221  */
 222 #define FLUSH_CURRENT(ctx, newstate)                            \
 223 do {                                                            \
 224    if (MESA_VERBOSE & VERBOSE_STATE)                            \
 225       _mesa_debug(ctx, "FLUSH_CURRENT in %s\n", MESA_FUNCTION); \
 226    if (ctx->Driver.NeedFlush & FLUSH_UPDATE_CURRENT)            \
 227       ctx->Driver.FlushVertices(ctx, FLUSH_UPDATE_CURRENT);     \
 228    ctx->NewState |= newstate;                                   \
 229 } while (0)
 230
 231 /**
 232  * Macro to assert that the API call was made outside the
 233  * glBegin()/glEnd() pair, with return value.
 234  *
 235  * \param ctx GL context.
 236  * \param retval value to return value in case the assertion fails.
 237  */
 238 #define ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, retval)               \
 239 do {                                                                    \
 240    if (ctx->Driver.CurrentExecPrimitive != PRIM_OUTSIDE_BEGIN_END) {    \
 241       _mesa_error(ctx, GL_INVALID_OPERATION, "Inside glBegin/glEnd");   \
 242       return retval;                                                    \
 243    }                                                                    \
 244 } while (0)
 245
 246 /**
 247  * Macro to assert that the API call was made outside the
 248  * glBegin()/glEnd() pair.
 249  *
 250  * \param ctx GL context.
 251  */
 252 #define ASSERT_OUTSIDE_BEGIN_END(ctx)                                   \
 253 do {                                                                    \
 254    if (ctx->Driver.CurrentExecPrimitive != PRIM_OUTSIDE_BEGIN_END) {    \
 255       _mesa_error(ctx, GL_INVALID_OPERATION, "Inside glBegin/glEnd");   \
 256       return;                                                           \
 257    }                                                                    \
 258 } while (0)
 259
 260 /**
 261  * Macro to assert that the API call was made outside the
 262  * glBegin()/glEnd() pair and flush the vertices.
 263  *
 264  * \param ctx GL context.
 265  */
 266 #define ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx)                         \
 267 do {                                                                    \
 268    ASSERT_OUTSIDE_BEGIN_END(ctx);                                       \
 269    FLUSH_VERTICES(ctx, 0);                                              \
 270 } while (0)
 271
 272 /**
 273  * Macro to assert that the API call was made outside the
 274  * glBegin()/glEnd() pair and flush the vertices, with return value.
 275  *
 276  * \param ctx GL context.
 277  * \param retval value to return value in case the assertion fails.
 278  */
 279 #define ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH_WITH_RETVAL(ctx, retval)     \
 280 do {                                                                    \
 281    ASSERT_OUTSIDE_BEGIN_END_WITH_RETVAL(ctx, retval);                   \
 282    FLUSH_VERTICES(ctx, 0);                                              \
 283 } while (0)
 284
 285 /*@}*/
 286
 287
 288
 289 /**
 290  * Is the secondary color needed?
 291  */
 292 #define NEED_SECONDARY_COLOR(CTX)                                       \
 293    (((CTX)->Light.Enabled &&                                            \
 294      (CTX)->Light.Model.ColorControl == GL_SEPARATE_SPECULAR_COLOR)     \
 295     || (CTX)->Fog.ColorSumEnabled                                       \
 296     || ((CTX)->VertexProgram._Current &&                                \
 297         ((CTX)->VertexProgram._Current != (CTX)->VertexProgram._TnlProgram) &&    \
 298         ((CTX)->VertexProgram._Current->Base.InputsRead & VERT_BIT_COLOR1)) \
 299     || ((CTX)->FragmentProgram._Current &&                              \
 300         ((CTX)->FragmentProgram._Current != (CTX)->FragmentProgram._TexEnvProgram) &&  \
 301         ((CTX)->FragmentProgram._Current->Base.InputsRead & FRAG_BIT_COL1)) \
 302    )
 303
 304
 305 /**
 306  * Is RGBA LogicOp enabled?
 307  */
 308 #define RGBA_LOGICOP_ENABLED(CTX) \
 309   ((CTX)->Color.ColorLogicOpEnabled || \
 310    ((CTX)->Color.BlendEnabled && (CTX)->Color.Blend[0].EquationRGB == GL_LOGIC_OP))
 311
 312
 313 #endif /* CONTEXT_H */