2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
6 * Copyright (C) 2008 VMware, Inc. All Rights Reserved.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
22 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
23 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
24 * OTHER DEALINGS IN THE SOFTWARE.
29 * Mesa context/visual/framebuffer management functions.
34 * \mainpage Mesa Main Module
36 * \section MainIntroduction Introduction
38 * The Mesa Main module consists of all the files in the main/ directory.
39 * Among the features of this module are:
41 * <LI> Structures to represent most GL state </LI>
42 * <LI> State set/get functions </LI>
43 * <LI> Display lists </LI>
44 * <LI> Texture unit, object and image handling </LI>
45 * <LI> Matrix and attribute stacks </LI>
48 * Other modules are responsible for API dispatch, vertex transformation,
49 * point/line/triangle setup, rasterization, vertex array caching,
50 * vertex/fragment programs/shaders, etc.
53 * \section AboutDoxygen About Doxygen
55 * If you're viewing this information as Doxygen-generated HTML you'll
56 * see the documentation index at the top of this page.
58 * The first line lists the Mesa source code modules.
59 * The second line lists the indexes available for viewing the documentation
62 * Selecting the <b>Main page</b> link will display a summary of the module
65 * Selecting <b>Data Structures</b> will list all C structures.
67 * Selecting the <b>File List</b> link will list all the source files in
69 * Selecting a filename will show a list of all functions defined in that file.
71 * Selecting the <b>Data Fields</b> link will display a list of all
72 * documented structure members.
74 * Selecting the <b>Globals</b> link will display a list
75 * of all functions, structures, global variables and macros in the module.
84 #include "api_loopback.h"
89 #include "bufferobj.h"
96 #include "extensions.h"
101 #include "framebuffer.h"
108 #include "multisample.h"
110 #include "pixelstore.h"
113 #include "queryobj.h"
119 #include "shaderobj.h"
120 #include "simple_list.h"
123 #include "texcompress_s3tc.h"
124 #include "texstate.h"
125 #include "transformfeedback.h"
129 #include "viewport.h"
131 #include "program/program.h"
132 #include "program/prog_print.h"
133 #include "math/m_matrix.h"
134 #include "main/dispatch.h" /* for _gloffset_COUNT */
137 #include "sparc/sparc.h"
140 #include "glsl_parser_extras.h"
145 int MESA_VERBOSE
= 0;
148 #ifndef MESA_DEBUG_FLAGS
149 int MESA_DEBUG_FLAGS
= 0;
153 /* ubyte -> float conversion */
154 GLfloat _mesa_ubyte_to_float_color_tab
[256];
159 * Swap buffers notification callback.
161 * \param ctx GL context.
163 * Called by window system just before swapping buffers.
164 * We have to finish any pending rendering.
167 _mesa_notifySwapBuffers(struct gl_context
*ctx
)
169 if (MESA_VERBOSE
& VERBOSE_SWAPBUFFERS
)
170 _mesa_debug(ctx
, "SwapBuffers\n");
171 FLUSH_CURRENT( ctx
, 0 );
172 if (ctx
->Driver
.Flush
) {
173 ctx
->Driver
.Flush(ctx
);
178 /**********************************************************************/
179 /** \name GL Visual allocation/destruction */
180 /**********************************************************************/
184 * Allocates a struct gl_config structure and initializes it via
185 * _mesa_initialize_visual().
187 * \param dbFlag double buffering
188 * \param stereoFlag stereo buffer
189 * \param depthBits requested bits per depth buffer value. Any value in [0, 32]
190 * is acceptable but the actual depth type will be GLushort or GLuint as
192 * \param stencilBits requested minimum bits per stencil buffer value
193 * \param accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits number
194 * of bits per color component in accum buffer.
195 * \param indexBits number of bits per pixel if \p rgbFlag is GL_FALSE
196 * \param redBits number of bits per color component in frame buffer for RGB(A)
197 * mode. We always use 8 in core Mesa though.
198 * \param greenBits same as above.
199 * \param blueBits same as above.
200 * \param alphaBits same as above.
201 * \param numSamples not really used.
203 * \return pointer to new struct gl_config or NULL if requested parameters
206 * \note Need to add params for level and numAuxBuffers (at least)
209 _mesa_create_visual( GLboolean dbFlag
,
210 GLboolean stereoFlag
,
218 GLint accumGreenBits
,
220 GLint accumAlphaBits
,
223 struct gl_config
*vis
= CALLOC_STRUCT(gl_config
);
225 if (!_mesa_initialize_visual(vis
, dbFlag
, stereoFlag
,
226 redBits
, greenBits
, blueBits
, alphaBits
,
227 depthBits
, stencilBits
,
228 accumRedBits
, accumGreenBits
,
229 accumBlueBits
, accumAlphaBits
,
240 * Makes some sanity checks and fills in the fields of the struct
241 * gl_config object with the given parameters. If the caller needs to
242 * set additional fields, he should just probably init the whole
243 * gl_config object himself.
245 * \return GL_TRUE on success, or GL_FALSE on failure.
247 * \sa _mesa_create_visual() above for the parameter description.
250 _mesa_initialize_visual( struct gl_config
*vis
,
252 GLboolean stereoFlag
,
260 GLint accumGreenBits
,
262 GLint accumAlphaBits
,
267 if (depthBits
< 0 || depthBits
> 32) {
270 if (stencilBits
< 0 || stencilBits
> 8) {
273 assert(accumRedBits
>= 0);
274 assert(accumGreenBits
>= 0);
275 assert(accumBlueBits
>= 0);
276 assert(accumAlphaBits
>= 0);
278 vis
->rgbMode
= GL_TRUE
;
279 vis
->doubleBufferMode
= dbFlag
;
280 vis
->stereoMode
= stereoFlag
;
282 vis
->redBits
= redBits
;
283 vis
->greenBits
= greenBits
;
284 vis
->blueBits
= blueBits
;
285 vis
->alphaBits
= alphaBits
;
286 vis
->rgbBits
= redBits
+ greenBits
+ blueBits
;
289 vis
->depthBits
= depthBits
;
290 vis
->stencilBits
= stencilBits
;
292 vis
->accumRedBits
= accumRedBits
;
293 vis
->accumGreenBits
= accumGreenBits
;
294 vis
->accumBlueBits
= accumBlueBits
;
295 vis
->accumAlphaBits
= accumAlphaBits
;
297 vis
->haveAccumBuffer
= accumRedBits
> 0;
298 vis
->haveDepthBuffer
= depthBits
> 0;
299 vis
->haveStencilBuffer
= stencilBits
> 0;
301 vis
->numAuxBuffers
= 0;
303 vis
->sampleBuffers
= numSamples
> 0 ? 1 : 0;
304 vis
->samples
= numSamples
;
311 * Destroy a visual and free its memory.
315 * Frees the visual structure.
318 _mesa_destroy_visual( struct gl_config
*vis
)
326 /**********************************************************************/
327 /** \name Context allocation, initialization, destroying
329 * The purpose of the most initialization functions here is to provide the
330 * default state values according to the OpenGL specification.
332 /**********************************************************************/
337 * This is lame. gdb only seems to recognize enum types that are
338 * actually used somewhere. We want to be able to print/use enum
339 * values such as TEXTURE_2D_INDEX in gdb. But we don't actually use
340 * the gl_texture_index type anywhere. Thus, this lame function.
343 dummy_enum_func(void)
345 gl_buffer_index bi
= BUFFER_FRONT_LEFT
;
346 gl_face_index fi
= FACE_POS_X
;
347 gl_frag_result fr
= FRAG_RESULT_DEPTH
;
348 gl_texture_index ti
= TEXTURE_2D_ARRAY_INDEX
;
349 gl_vert_attrib va
= VERT_ATTRIB_POS
;
350 gl_varying_slot vs
= VARYING_SLOT_POS
;
362 * One-time initialization mutex lock.
364 * \sa Used by one_time_init().
366 _glthread_DECLARE_STATIC_MUTEX(OneTimeLock
);
371 * Calls all the various one-time-init functions in Mesa.
373 * While holding a global mutex lock, calls several initialization functions,
374 * and sets the glapi callbacks if the \c MESA_DEBUG environment variable is
380 one_time_init( struct gl_context
*ctx
)
382 static GLbitfield api_init_mask
= 0x0;
384 _glthread_LOCK_MUTEX(OneTimeLock
);
386 /* truly one-time init */
387 if (!api_init_mask
) {
390 /* do some implementation tests */
391 assert( sizeof(GLbyte
) == 1 );
392 assert( sizeof(GLubyte
) == 1 );
393 assert( sizeof(GLshort
) == 2 );
394 assert( sizeof(GLushort
) == 2 );
395 assert( sizeof(GLint
) == 4 );
396 assert( sizeof(GLuint
) == 4 );
398 _mesa_get_cpu_features();
400 for (i
= 0; i
< 256; i
++) {
401 _mesa_ubyte_to_float_color_tab
[i
] = (float) i
/ 255.0F
;
404 #if defined(DEBUG) && defined(__DATE__) && defined(__TIME__)
405 if (MESA_VERBOSE
!= 0) {
406 _mesa_debug(ctx
, "Mesa %s DEBUG build %s %s\n",
407 PACKAGE_VERSION
, __DATE__
, __TIME__
);
412 _mesa_test_formats();
416 /* per-API one-time init */
417 if (!(api_init_mask
& (1 << ctx
->API
))) {
418 _mesa_init_get_hash(ctx
);
420 _mesa_init_remap_table();
423 api_init_mask
|= 1 << ctx
->API
;
425 _glthread_UNLOCK_MUTEX(OneTimeLock
);
427 /* Hopefully atexit() is widely available. If not, we may need some
430 atexit(_mesa_destroy_shader_compiler
);
437 * Initialize fields of gl_current_attrib (aka ctx->Current.*)
440 _mesa_init_current(struct gl_context
*ctx
)
444 /* Init all to (0,0,0,1) */
445 for (i
= 0; i
< Elements(ctx
->Current
.Attrib
); i
++) {
446 ASSIGN_4V( ctx
->Current
.Attrib
[i
], 0.0, 0.0, 0.0, 1.0 );
449 /* redo special cases: */
450 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_WEIGHT
], 1.0, 0.0, 0.0, 0.0 );
451 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_NORMAL
], 0.0, 0.0, 1.0, 1.0 );
452 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_COLOR0
], 1.0, 1.0, 1.0, 1.0 );
453 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_COLOR1
], 0.0, 0.0, 0.0, 1.0 );
454 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_COLOR_INDEX
], 1.0, 0.0, 0.0, 1.0 );
455 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_EDGEFLAG
], 1.0, 0.0, 0.0, 1.0 );
460 * Init vertex/fragment/geometry program limits.
461 * Important: drivers should override these with actual limits.
464 init_program_limits(struct gl_context
*ctx
, GLenum type
,
465 struct gl_program_constants
*prog
)
467 prog
->MaxInstructions
= MAX_PROGRAM_INSTRUCTIONS
;
468 prog
->MaxAluInstructions
= MAX_PROGRAM_INSTRUCTIONS
;
469 prog
->MaxTexInstructions
= MAX_PROGRAM_INSTRUCTIONS
;
470 prog
->MaxTexIndirections
= MAX_PROGRAM_INSTRUCTIONS
;
471 prog
->MaxTemps
= MAX_PROGRAM_TEMPS
;
472 prog
->MaxEnvParams
= MAX_PROGRAM_ENV_PARAMS
;
473 prog
->MaxLocalParams
= MAX_PROGRAM_LOCAL_PARAMS
;
474 prog
->MaxAddressOffset
= MAX_PROGRAM_LOCAL_PARAMS
;
477 case GL_VERTEX_PROGRAM_ARB
:
478 prog
->MaxParameters
= MAX_VERTEX_PROGRAM_PARAMS
;
479 prog
->MaxAttribs
= MAX_VERTEX_GENERIC_ATTRIBS
;
480 prog
->MaxAddressRegs
= MAX_VERTEX_PROGRAM_ADDRESS_REGS
;
481 prog
->MaxUniformComponents
= 4 * MAX_UNIFORMS
;
483 case GL_FRAGMENT_PROGRAM_ARB
:
484 prog
->MaxParameters
= MAX_NV_FRAGMENT_PROGRAM_PARAMS
;
485 prog
->MaxAttribs
= MAX_NV_FRAGMENT_PROGRAM_INPUTS
;
486 prog
->MaxAddressRegs
= MAX_FRAGMENT_PROGRAM_ADDRESS_REGS
;
487 prog
->MaxUniformComponents
= 4 * MAX_UNIFORMS
;
489 case MESA_GEOMETRY_PROGRAM
:
490 prog
->MaxParameters
= MAX_VERTEX_PROGRAM_PARAMS
;
491 prog
->MaxAttribs
= MAX_VERTEX_GENERIC_ATTRIBS
;
492 prog
->MaxAddressRegs
= MAX_VERTEX_PROGRAM_ADDRESS_REGS
;
493 prog
->MaxUniformComponents
= MAX_GEOMETRY_UNIFORM_COMPONENTS
;
496 assert(0 && "Bad program type in init_program_limits()");
499 /* Set the native limits to zero. This implies that there is no native
500 * support for shaders. Let the drivers fill in the actual values.
502 prog
->MaxNativeInstructions
= 0;
503 prog
->MaxNativeAluInstructions
= 0;
504 prog
->MaxNativeTexInstructions
= 0;
505 prog
->MaxNativeTexIndirections
= 0;
506 prog
->MaxNativeAttribs
= 0;
507 prog
->MaxNativeTemps
= 0;
508 prog
->MaxNativeAddressRegs
= 0;
509 prog
->MaxNativeParameters
= 0;
511 /* Set GLSL datatype range/precision info assuming IEEE float values.
512 * Drivers should override these defaults as needed.
514 prog
->MediumFloat
.RangeMin
= 127;
515 prog
->MediumFloat
.RangeMax
= 127;
516 prog
->MediumFloat
.Precision
= 23;
517 prog
->LowFloat
= prog
->HighFloat
= prog
->MediumFloat
;
519 /* Assume ints are stored as floats for now, since this is the least-common
520 * denominator. The OpenGL ES spec implies (page 132) that the precision
521 * of integer types should be 0. Practically speaking, IEEE
522 * single-precision floating point values can only store integers in the
523 * range [-0x01000000, 0x01000000] without loss of precision.
525 prog
->MediumInt
.RangeMin
= 24;
526 prog
->MediumInt
.RangeMax
= 24;
527 prog
->MediumInt
.Precision
= 0;
528 prog
->LowInt
= prog
->HighInt
= prog
->MediumInt
;
530 prog
->MaxUniformBlocks
= 12;
531 prog
->MaxCombinedUniformComponents
= (prog
->MaxUniformComponents
+
532 ctx
->Const
.MaxUniformBlockSize
/ 4 *
533 prog
->MaxUniformBlocks
);
538 * Initialize fields of gl_constants (aka ctx->Const.*).
539 * Use defaults from config.h. The device drivers will often override
540 * some of these values (such as number of texture units).
543 _mesa_init_constants(struct gl_context
*ctx
)
547 /* Constants, may be overriden (usually only reduced) by device drivers */
548 ctx
->Const
.MaxTextureMbytes
= MAX_TEXTURE_MBYTES
;
549 ctx
->Const
.MaxTextureLevels
= MAX_TEXTURE_LEVELS
;
550 ctx
->Const
.Max3DTextureLevels
= MAX_3D_TEXTURE_LEVELS
;
551 ctx
->Const
.MaxCubeTextureLevels
= MAX_CUBE_TEXTURE_LEVELS
;
552 ctx
->Const
.MaxTextureRectSize
= MAX_TEXTURE_RECT_SIZE
;
553 ctx
->Const
.MaxArrayTextureLayers
= MAX_ARRAY_TEXTURE_LAYERS
;
554 ctx
->Const
.MaxTextureCoordUnits
= MAX_TEXTURE_COORD_UNITS
;
555 ctx
->Const
.FragmentProgram
.MaxTextureImageUnits
= MAX_TEXTURE_IMAGE_UNITS
;
556 ctx
->Const
.MaxTextureUnits
= MIN2(ctx
->Const
.MaxTextureCoordUnits
,
557 ctx
->Const
.FragmentProgram
.MaxTextureImageUnits
);
558 ctx
->Const
.MaxTextureMaxAnisotropy
= MAX_TEXTURE_MAX_ANISOTROPY
;
559 ctx
->Const
.MaxTextureLodBias
= MAX_TEXTURE_LOD_BIAS
;
560 ctx
->Const
.MaxTextureBufferSize
= 65536;
561 ctx
->Const
.TextureBufferOffsetAlignment
= 1;
562 ctx
->Const
.MaxArrayLockSize
= MAX_ARRAY_LOCK_SIZE
;
563 ctx
->Const
.SubPixelBits
= SUB_PIXEL_BITS
;
564 ctx
->Const
.MinPointSize
= MIN_POINT_SIZE
;
565 ctx
->Const
.MaxPointSize
= MAX_POINT_SIZE
;
566 ctx
->Const
.MinPointSizeAA
= MIN_POINT_SIZE
;
567 ctx
->Const
.MaxPointSizeAA
= MAX_POINT_SIZE
;
568 ctx
->Const
.PointSizeGranularity
= (GLfloat
) POINT_SIZE_GRANULARITY
;
569 ctx
->Const
.MinLineWidth
= MIN_LINE_WIDTH
;
570 ctx
->Const
.MaxLineWidth
= MAX_LINE_WIDTH
;
571 ctx
->Const
.MinLineWidthAA
= MIN_LINE_WIDTH
;
572 ctx
->Const
.MaxLineWidthAA
= MAX_LINE_WIDTH
;
573 ctx
->Const
.LineWidthGranularity
= (GLfloat
) LINE_WIDTH_GRANULARITY
;
574 ctx
->Const
.MaxClipPlanes
= 6;
575 ctx
->Const
.MaxLights
= MAX_LIGHTS
;
576 ctx
->Const
.MaxShininess
= 128.0;
577 ctx
->Const
.MaxSpotExponent
= 128.0;
578 ctx
->Const
.MaxViewportWidth
= MAX_VIEWPORT_WIDTH
;
579 ctx
->Const
.MaxViewportHeight
= MAX_VIEWPORT_HEIGHT
;
581 /** GL_ARB_uniform_buffer_object */
582 ctx
->Const
.MaxCombinedUniformBlocks
= 36;
583 ctx
->Const
.MaxUniformBufferBindings
= 36;
584 ctx
->Const
.MaxUniformBlockSize
= 16384;
585 ctx
->Const
.UniformBufferOffsetAlignment
= 1;
587 init_program_limits(ctx
, GL_VERTEX_PROGRAM_ARB
, &ctx
->Const
.VertexProgram
);
588 init_program_limits(ctx
, GL_FRAGMENT_PROGRAM_ARB
, &ctx
->Const
.FragmentProgram
);
589 init_program_limits(ctx
, MESA_GEOMETRY_PROGRAM
, &ctx
->Const
.GeometryProgram
);
591 ctx
->Const
.MaxProgramMatrices
= MAX_PROGRAM_MATRICES
;
592 ctx
->Const
.MaxProgramMatrixStackDepth
= MAX_PROGRAM_MATRIX_STACK_DEPTH
;
594 /* CheckArrayBounds is overriden by drivers/x11 for X server */
595 ctx
->Const
.CheckArrayBounds
= GL_FALSE
;
597 /* GL_ARB_draw_buffers */
598 ctx
->Const
.MaxDrawBuffers
= MAX_DRAW_BUFFERS
;
600 ctx
->Const
.MaxColorAttachments
= MAX_COLOR_ATTACHMENTS
;
601 ctx
->Const
.MaxRenderbufferSize
= MAX_RENDERBUFFER_SIZE
;
603 ctx
->Const
.VertexProgram
.MaxTextureImageUnits
= MAX_TEXTURE_IMAGE_UNITS
;
604 ctx
->Const
.MaxCombinedTextureImageUnits
= MAX_COMBINED_TEXTURE_IMAGE_UNITS
;
605 ctx
->Const
.MaxVarying
= 16; /* old limit not to break tnl and swrast */
606 ctx
->Const
.GeometryProgram
.MaxTextureImageUnits
= MAX_TEXTURE_IMAGE_UNITS
;
607 ctx
->Const
.MaxGeometryOutputVertices
= MAX_GEOMETRY_OUTPUT_VERTICES
;
608 ctx
->Const
.MaxGeometryTotalOutputComponents
= MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS
;
610 /* Shading language version */
611 if (_mesa_is_desktop_gl(ctx
)) {
612 ctx
->Const
.GLSLVersion
= 120;
613 _mesa_override_glsl_version(ctx
);
615 else if (ctx
->API
== API_OPENGLES2
) {
616 ctx
->Const
.GLSLVersion
= 100;
618 else if (ctx
->API
== API_OPENGLES
) {
619 ctx
->Const
.GLSLVersion
= 0; /* GLSL not supported */
622 /* GL_ARB_framebuffer_object */
623 ctx
->Const
.MaxSamples
= 0;
626 ctx
->Const
.MaxServerWaitTimeout
= (GLuint64
) ~0;
628 /* GL_ATI_envmap_bumpmap */
629 ctx
->Const
.SupportedBumpUnits
= SUPPORTED_ATI_BUMP_UNITS
;
631 /* GL_EXT_provoking_vertex */
632 ctx
->Const
.QuadsFollowProvokingVertexConvention
= GL_TRUE
;
634 /* GL_EXT_transform_feedback */
635 ctx
->Const
.MaxTransformFeedbackBuffers
= MAX_FEEDBACK_BUFFERS
;
636 ctx
->Const
.MaxTransformFeedbackSeparateComponents
= 4 * MAX_FEEDBACK_ATTRIBS
;
637 ctx
->Const
.MaxTransformFeedbackInterleavedComponents
= 4 * MAX_FEEDBACK_ATTRIBS
;
638 ctx
->Const
.MaxVertexStreams
= 1;
640 /* GL 3.2: hard-coded for now: */
641 ctx
->Const
.ProfileMask
= GL_CONTEXT_COMPATIBILITY_PROFILE_BIT
;
643 /** GL_EXT_gpu_shader4 */
644 ctx
->Const
.MinProgramTexelOffset
= -8;
645 ctx
->Const
.MaxProgramTexelOffset
= 7;
647 /* GL_ARB_robustness */
648 ctx
->Const
.ResetStrategy
= GL_NO_RESET_NOTIFICATION_ARB
;
650 /* PrimitiveRestart */
651 ctx
->Const
.PrimitiveRestartInSoftware
= GL_FALSE
;
653 /* ES 3.0 or ARB_ES3_compatibility */
654 ctx
->Const
.MaxElementIndex
= 0xffffffffu
;
656 /* GL_ARB_texture_multisample */
657 ctx
->Const
.MaxColorTextureSamples
= 1;
658 ctx
->Const
.MaxDepthTextureSamples
= 1;
659 ctx
->Const
.MaxIntegerSamples
= 1;
664 * Do some sanity checks on the limits/constants for the given context.
665 * Only called the first time a context is bound.
668 check_context_limits(struct gl_context
*ctx
)
670 /* check that we don't exceed the size of various bitfields */
671 assert(VARYING_SLOT_MAX
<=
672 (8 * sizeof(ctx
->VertexProgram
._Current
->Base
.OutputsWritten
)));
673 assert(VARYING_SLOT_MAX
<=
674 (8 * sizeof(ctx
->FragmentProgram
._Current
->Base
.InputsRead
)));
676 /* shader-related checks */
677 assert(ctx
->Const
.FragmentProgram
.MaxLocalParams
<= MAX_PROGRAM_LOCAL_PARAMS
);
678 assert(ctx
->Const
.VertexProgram
.MaxLocalParams
<= MAX_PROGRAM_LOCAL_PARAMS
);
680 /* Texture unit checks */
681 assert(ctx
->Const
.FragmentProgram
.MaxTextureImageUnits
> 0);
682 assert(ctx
->Const
.FragmentProgram
.MaxTextureImageUnits
<= MAX_TEXTURE_IMAGE_UNITS
);
683 assert(ctx
->Const
.MaxTextureCoordUnits
> 0);
684 assert(ctx
->Const
.MaxTextureCoordUnits
<= MAX_TEXTURE_COORD_UNITS
);
685 assert(ctx
->Const
.MaxTextureUnits
> 0);
686 assert(ctx
->Const
.MaxTextureUnits
<= MAX_TEXTURE_IMAGE_UNITS
);
687 assert(ctx
->Const
.MaxTextureUnits
<= MAX_TEXTURE_COORD_UNITS
);
688 assert(ctx
->Const
.MaxTextureUnits
== MIN2(ctx
->Const
.FragmentProgram
.MaxTextureImageUnits
,
689 ctx
->Const
.MaxTextureCoordUnits
));
690 assert(ctx
->Const
.MaxCombinedTextureImageUnits
> 0);
691 assert(ctx
->Const
.MaxCombinedTextureImageUnits
<= MAX_COMBINED_TEXTURE_IMAGE_UNITS
);
692 assert(ctx
->Const
.MaxTextureCoordUnits
<= MAX_COMBINED_TEXTURE_IMAGE_UNITS
);
693 /* number of coord units cannot be greater than number of image units */
694 assert(ctx
->Const
.MaxTextureCoordUnits
<= ctx
->Const
.FragmentProgram
.MaxTextureImageUnits
);
697 /* Texture size checks */
698 assert(ctx
->Const
.MaxTextureLevels
<= MAX_TEXTURE_LEVELS
);
699 assert(ctx
->Const
.Max3DTextureLevels
<= MAX_3D_TEXTURE_LEVELS
);
700 assert(ctx
->Const
.MaxCubeTextureLevels
<= MAX_CUBE_TEXTURE_LEVELS
);
701 assert(ctx
->Const
.MaxTextureRectSize
<= MAX_TEXTURE_RECT_SIZE
);
703 /* Texture level checks */
704 assert(MAX_TEXTURE_LEVELS
>= MAX_3D_TEXTURE_LEVELS
);
705 assert(MAX_TEXTURE_LEVELS
>= MAX_CUBE_TEXTURE_LEVELS
);
707 /* Max texture size should be <= max viewport size (render to texture) */
708 assert((1U << (ctx
->Const
.MaxTextureLevels
- 1))
709 <= ctx
->Const
.MaxViewportWidth
);
710 assert((1U << (ctx
->Const
.MaxTextureLevels
- 1))
711 <= ctx
->Const
.MaxViewportHeight
);
713 assert(ctx
->Const
.MaxDrawBuffers
<= MAX_DRAW_BUFFERS
);
715 /* if this fails, add more enum values to gl_buffer_index */
716 assert(BUFFER_COLOR0
+ MAX_DRAW_BUFFERS
<= BUFFER_COUNT
);
718 /* XXX probably add more tests */
723 * Initialize the attribute groups in a GL context.
725 * \param ctx GL context.
727 * Initializes all the attributes, calling the respective <tt>init*</tt>
728 * functions for the more complex data structures.
731 init_attrib_groups(struct gl_context
*ctx
)
736 _mesa_init_constants( ctx
);
739 _mesa_init_extensions( ctx
);
741 /* Attribute Groups */
742 _mesa_init_accum( ctx
);
743 _mesa_init_attrib( ctx
);
744 _mesa_init_buffer_objects( ctx
);
745 _mesa_init_color( ctx
);
746 _mesa_init_current( ctx
);
747 _mesa_init_depth( ctx
);
748 _mesa_init_debug( ctx
);
749 _mesa_init_display_list( ctx
);
750 _mesa_init_errors( ctx
);
751 _mesa_init_eval( ctx
);
752 _mesa_init_fbobjects( ctx
);
753 _mesa_init_feedback( ctx
);
754 _mesa_init_fog( ctx
);
755 _mesa_init_hint( ctx
);
756 _mesa_init_line( ctx
);
757 _mesa_init_lighting( ctx
);
758 _mesa_init_matrix( ctx
);
759 _mesa_init_multisample( ctx
);
760 _mesa_init_pixel( ctx
);
761 _mesa_init_pixelstore( ctx
);
762 _mesa_init_point( ctx
);
763 _mesa_init_polygon( ctx
);
764 _mesa_init_program( ctx
);
765 _mesa_init_queryobj( ctx
);
766 _mesa_init_sync( ctx
);
767 _mesa_init_rastpos( ctx
);
768 _mesa_init_scissor( ctx
);
769 _mesa_init_shader_state( ctx
);
770 _mesa_init_stencil( ctx
);
771 _mesa_init_transform( ctx
);
772 _mesa_init_transform_feedback( ctx
);
773 _mesa_init_varray( ctx
);
774 _mesa_init_viewport( ctx
);
776 if (!_mesa_init_texture( ctx
))
779 _mesa_init_texture_s3tc( ctx
);
782 ctx
->NewState
= _NEW_ALL
;
783 ctx
->NewDriverState
= ~0;
784 ctx
->ErrorValue
= GL_NO_ERROR
;
785 ctx
->ResetStatus
= GL_NO_ERROR
;
786 ctx
->varying_vp_inputs
= VERT_BIT_ALL
;
793 * Update default objects in a GL context with respect to shared state.
795 * \param ctx GL context.
797 * Removes references to old default objects, (texture objects, program
798 * objects, etc.) and changes to reference those from the current shared
802 update_default_objects(struct gl_context
*ctx
)
806 _mesa_update_default_objects_program(ctx
);
807 _mesa_update_default_objects_texture(ctx
);
808 _mesa_update_default_objects_buffer_objects(ctx
);
815 * This is the default function we plug into all dispatch table slots
816 * This helps prevents a segfault when someone calls a GL function without
817 * first checking if the extension's supported.
820 _mesa_generic_nop(void)
822 GET_CURRENT_CONTEXT(ctx
);
823 _mesa_error(ctx
, GL_INVALID_OPERATION
,
824 "unsupported function called "
825 "(unsupported extension or deprecated function?)");
831 * Allocate and initialize a new dispatch table.
833 struct _glapi_table
*
834 _mesa_alloc_dispatch_table()
836 /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
837 * In practice, this'll be the same for stand-alone Mesa. But for DRI
838 * Mesa we do this to accomodate different versions of libGL and various
841 GLint numEntries
= MAX2(_glapi_get_dispatch_table_size(), _gloffset_COUNT
);
842 struct _glapi_table
*table
;
844 table
= malloc(numEntries
* sizeof(_glapi_proc
));
846 _glapi_proc
*entry
= (_glapi_proc
*) table
;
848 for (i
= 0; i
< numEntries
; i
++) {
849 entry
[i
] = (_glapi_proc
) _mesa_generic_nop
;
856 * Creates a minimal dispatch table for use within glBegin()/glEnd().
858 * This ensures that we generate GL_INVALID_OPERATION errors from most
859 * functions, since the set of functions that are valid within Begin/End is
862 * From the GL 1.0 specification section 2.6.3, "GL Commands within
865 * "The only GL commands that are allowed within any Begin/End pairs are
866 * the commands for specifying vertex coordinates, vertex color, normal
867 * coordinates, and texture coordinates (Vertex, Color, Index, Normal,
868 * TexCoord), EvalCoord and EvalPoint commands (see section 5.1),
869 * commands for specifying lighting material parameters (Material
870 * commands see section 2.12.2), display list invocation commands
871 * (CallList and CallLists see section 5.4), and the EdgeFlag
872 * command. Executing Begin after Begin has already been executed but
873 * before an End is issued generates the INVALID OPERATION error, as does
874 * executing End without a previous corresponding Begin. Executing any
875 * other GL command within Begin/End results in the error INVALID
878 * The table entries for specifying vertex attributes are set up by
879 * install_vtxfmt() and _mesa_loopback_init_api_table(), and End() and dlists
880 * are set by install_vtxfmt() as well.
882 static struct _glapi_table
*
883 create_beginend_table(const struct gl_context
*ctx
)
885 struct _glapi_table
*table
;
887 table
= _mesa_alloc_dispatch_table();
891 /* Fill in functions which return a value, since they should return some
892 * specific value even if they emit a GL_INVALID_OPERATION error from them
893 * being called within glBegin()/glEnd().
895 #define COPY_DISPATCH(func) SET_##func(table, GET_##func(ctx->Exec))
897 COPY_DISPATCH(GenLists
);
898 COPY_DISPATCH(IsProgram
);
899 COPY_DISPATCH(IsVertexArray
);
900 COPY_DISPATCH(IsBuffer
);
901 COPY_DISPATCH(IsEnabled
);
902 COPY_DISPATCH(IsEnabledi
);
903 COPY_DISPATCH(IsRenderbuffer
);
904 COPY_DISPATCH(IsFramebuffer
);
905 COPY_DISPATCH(CheckFramebufferStatus
);
906 COPY_DISPATCH(RenderMode
);
907 COPY_DISPATCH(GetString
);
908 COPY_DISPATCH(GetStringi
);
909 COPY_DISPATCH(GetPointerv
);
910 COPY_DISPATCH(IsQuery
);
911 COPY_DISPATCH(IsSampler
);
912 COPY_DISPATCH(IsSync
);
913 COPY_DISPATCH(IsTexture
);
914 COPY_DISPATCH(IsTransformFeedback
);
915 COPY_DISPATCH(DeleteQueries
);
916 COPY_DISPATCH(AreTexturesResident
);
917 COPY_DISPATCH(FenceSync
);
918 COPY_DISPATCH(ClientWaitSync
);
919 COPY_DISPATCH(MapBuffer
);
920 COPY_DISPATCH(UnmapBuffer
);
921 COPY_DISPATCH(MapBufferRange
);
922 COPY_DISPATCH(ObjectPurgeableAPPLE
);
923 COPY_DISPATCH(ObjectUnpurgeableAPPLE
);
925 _mesa_loopback_init_api_table(ctx
, table
);
931 _mesa_initialize_dispatch_tables(struct gl_context
*ctx
)
933 /* Do the code-generated setup of the exec table in api_exec.c. */
934 _mesa_initialize_exec_table(ctx
);
937 _mesa_initialize_save_table(ctx
);
941 * Initialize a struct gl_context struct (rendering context).
943 * This includes allocating all the other structs and arrays which hang off of
944 * the context by pointers.
945 * Note that the driver needs to pass in its dd_function_table here since
946 * we need to at least call driverFunctions->NewTextureObject to create the
947 * default texture objects.
949 * Called by _mesa_create_context().
951 * Performs the imports and exports callback tables initialization, and
952 * miscellaneous one-time initializations. If no shared context is supplied one
953 * is allocated, and increase its reference count. Setups the GL API dispatch
954 * tables. Initialize the TNL module. Sets the maximum Z buffer depth.
955 * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
958 * \param ctx the context to initialize
959 * \param api the GL API type to create the context for
960 * \param visual describes the visual attributes for this context
961 * \param share_list points to context to share textures, display lists,
963 * \param driverFunctions table of device driver functions for this context
967 _mesa_initialize_context(struct gl_context
*ctx
,
969 const struct gl_config
*visual
,
970 struct gl_context
*share_list
,
971 const struct dd_function_table
*driverFunctions
)
973 struct gl_shared_state
*shared
;
976 assert(driverFunctions
->NewTextureObject
);
977 assert(driverFunctions
->FreeTextureImageBuffer
);
980 ctx
->Visual
= *visual
;
981 ctx
->DrawBuffer
= NULL
;
982 ctx
->ReadBuffer
= NULL
;
983 ctx
->WinSysDrawBuffer
= NULL
;
984 ctx
->WinSysReadBuffer
= NULL
;
986 if (_mesa_is_desktop_gl(ctx
)) {
987 _mesa_override_gl_version(ctx
);
990 /* misc one-time initializations */
993 /* Plug in driver functions and context pointer here.
994 * This is important because when we call alloc_shared_state() below
995 * we'll call ctx->Driver.NewTextureObject() to create the default
998 ctx
->Driver
= *driverFunctions
;
1001 /* share state with another context */
1002 shared
= share_list
->Shared
;
1005 /* allocate new, unshared state */
1006 shared
= _mesa_alloc_shared_state(ctx
);
1011 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, shared
);
1013 if (!init_attrib_groups( ctx
))
1016 /* setup the API dispatch tables with all nop functions */
1017 ctx
->OutsideBeginEnd
= _mesa_alloc_dispatch_table();
1018 if (!ctx
->OutsideBeginEnd
)
1020 ctx
->Exec
= ctx
->OutsideBeginEnd
;
1021 ctx
->CurrentDispatch
= ctx
->OutsideBeginEnd
;
1023 ctx
->FragmentProgram
._MaintainTexEnvProgram
1024 = (_mesa_getenv("MESA_TEX_PROG") != NULL
);
1026 ctx
->VertexProgram
._MaintainTnlProgram
1027 = (_mesa_getenv("MESA_TNL_PROG") != NULL
);
1028 if (ctx
->VertexProgram
._MaintainTnlProgram
) {
1029 /* this is required... */
1030 ctx
->FragmentProgram
._MaintainTexEnvProgram
= GL_TRUE
;
1033 /* Mesa core handles all the formats that mesa core knows about.
1034 * Drivers will want to override this list with just the formats
1035 * they can handle, and confirm that appropriate fallbacks exist in
1036 * _mesa_choose_tex_format().
1038 memset(&ctx
->TextureFormatSupported
, GL_TRUE
,
1039 sizeof(ctx
->TextureFormatSupported
));
1042 case API_OPENGL_COMPAT
:
1043 ctx
->BeginEnd
= create_beginend_table(ctx
);
1044 ctx
->Save
= _mesa_alloc_dispatch_table();
1045 if (!ctx
->BeginEnd
|| !ctx
->Save
)
1049 case API_OPENGL_CORE
:
1053 * GL_OES_texture_cube_map says
1054 * "Initially all texture generation modes are set to REFLECTION_MAP_OES"
1056 for (i
= 0; i
< MAX_TEXTURE_UNITS
; i
++) {
1057 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[i
];
1058 texUnit
->GenS
.Mode
= GL_REFLECTION_MAP_NV
;
1059 texUnit
->GenT
.Mode
= GL_REFLECTION_MAP_NV
;
1060 texUnit
->GenR
.Mode
= GL_REFLECTION_MAP_NV
;
1061 texUnit
->GenS
._ModeBit
= TEXGEN_REFLECTION_MAP_NV
;
1062 texUnit
->GenT
._ModeBit
= TEXGEN_REFLECTION_MAP_NV
;
1063 texUnit
->GenR
._ModeBit
= TEXGEN_REFLECTION_MAP_NV
;
1067 ctx
->FragmentProgram
._MaintainTexEnvProgram
= GL_TRUE
;
1068 ctx
->VertexProgram
._MaintainTnlProgram
= GL_TRUE
;
1072 ctx
->FirstTimeCurrent
= GL_TRUE
;
1077 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, NULL
);
1078 free(ctx
->BeginEnd
);
1086 * Allocate and initialize a struct gl_context structure.
1087 * Note that the driver needs to pass in its dd_function_table here since
1088 * we need to at least call driverFunctions->NewTextureObject to initialize
1089 * the rendering context.
1091 * \param api the GL API type to create the context for
1092 * \param visual a struct gl_config pointer (we copy the struct contents)
1093 * \param share_list another context to share display lists with or NULL
1094 * \param driverFunctions points to the dd_function_table into which the
1095 * driver has plugged in all its special functions.
1097 * \return pointer to a new __struct gl_contextRec or NULL if error.
1100 _mesa_create_context(gl_api api
,
1101 const struct gl_config
*visual
,
1102 struct gl_context
*share_list
,
1103 const struct dd_function_table
*driverFunctions
)
1105 struct gl_context
*ctx
;
1109 ctx
= calloc(1, sizeof(struct gl_context
));
1113 if (_mesa_initialize_context(ctx
, api
, visual
, share_list
,
1125 * Free the data associated with the given context.
1127 * But doesn't free the struct gl_context struct itself.
1129 * \sa _mesa_initialize_context() and init_attrib_groups().
1132 _mesa_free_context_data( struct gl_context
*ctx
)
1134 if (!_mesa_get_current_context()){
1135 /* No current context, but we may need one in order to delete
1136 * texture objs, etc. So temporarily bind the context now.
1138 _mesa_make_current(ctx
, NULL
, NULL
);
1141 /* unreference WinSysDraw/Read buffers */
1142 _mesa_reference_framebuffer(&ctx
->WinSysDrawBuffer
, NULL
);
1143 _mesa_reference_framebuffer(&ctx
->WinSysReadBuffer
, NULL
);
1144 _mesa_reference_framebuffer(&ctx
->DrawBuffer
, NULL
);
1145 _mesa_reference_framebuffer(&ctx
->ReadBuffer
, NULL
);
1147 _mesa_reference_vertprog(ctx
, &ctx
->VertexProgram
.Current
, NULL
);
1148 _mesa_reference_vertprog(ctx
, &ctx
->VertexProgram
._Current
, NULL
);
1149 _mesa_reference_vertprog(ctx
, &ctx
->VertexProgram
._TnlProgram
, NULL
);
1151 _mesa_reference_fragprog(ctx
, &ctx
->FragmentProgram
.Current
, NULL
);
1152 _mesa_reference_fragprog(ctx
, &ctx
->FragmentProgram
._Current
, NULL
);
1153 _mesa_reference_fragprog(ctx
, &ctx
->FragmentProgram
._TexEnvProgram
, NULL
);
1155 _mesa_reference_array_object(ctx
, &ctx
->Array
.ArrayObj
, NULL
);
1156 _mesa_reference_array_object(ctx
, &ctx
->Array
.DefaultArrayObj
, NULL
);
1158 _mesa_free_attrib_data(ctx
);
1159 _mesa_free_buffer_objects(ctx
);
1160 _mesa_free_lighting_data( ctx
);
1161 _mesa_free_eval_data( ctx
);
1162 _mesa_free_texture_data( ctx
);
1163 _mesa_free_matrix_data( ctx
);
1164 _mesa_free_viewport_data( ctx
);
1165 _mesa_free_program_data(ctx
);
1166 _mesa_free_shader_state(ctx
);
1167 _mesa_free_queryobj_data(ctx
);
1168 _mesa_free_sync_data(ctx
);
1169 _mesa_free_varray_data(ctx
);
1170 _mesa_free_transform_feedback(ctx
);
1172 _mesa_reference_buffer_object(ctx
, &ctx
->Pack
.BufferObj
, NULL
);
1173 _mesa_reference_buffer_object(ctx
, &ctx
->Unpack
.BufferObj
, NULL
);
1174 _mesa_reference_buffer_object(ctx
, &ctx
->DefaultPacking
.BufferObj
, NULL
);
1175 _mesa_reference_buffer_object(ctx
, &ctx
->Array
.ArrayBufferObj
, NULL
);
1177 /* free dispatch tables */
1178 free(ctx
->BeginEnd
);
1182 /* Shared context state (display lists, textures, etc) */
1183 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, NULL
);
1185 /* needs to be after freeing shared state */
1186 _mesa_free_display_list_data(ctx
);
1188 _mesa_free_errors_data(ctx
);
1190 free((void *)ctx
->Extensions
.String
);
1192 free(ctx
->VersionString
);
1194 /* unbind the context if it's currently bound */
1195 if (ctx
== _mesa_get_current_context()) {
1196 _mesa_make_current(NULL
, NULL
, NULL
);
1202 * Destroy a struct gl_context structure.
1204 * \param ctx GL context.
1206 * Calls _mesa_free_context_data() and frees the gl_context object itself.
1209 _mesa_destroy_context( struct gl_context
*ctx
)
1212 _mesa_free_context_data(ctx
);
1213 free( (void *) ctx
);
1219 * Copy attribute groups from one context to another.
1221 * \param src source context
1222 * \param dst destination context
1223 * \param mask bitwise OR of GL_*_BIT flags
1225 * According to the bits specified in \p mask, copies the corresponding
1226 * attributes from \p src into \p dst. For many of the attributes a simple \c
1227 * memcpy is not enough due to the existence of internal pointers in their data
1231 _mesa_copy_context( const struct gl_context
*src
, struct gl_context
*dst
,
1234 if (mask
& GL_ACCUM_BUFFER_BIT
) {
1236 dst
->Accum
= src
->Accum
;
1238 if (mask
& GL_COLOR_BUFFER_BIT
) {
1240 dst
->Color
= src
->Color
;
1242 if (mask
& GL_CURRENT_BIT
) {
1244 dst
->Current
= src
->Current
;
1246 if (mask
& GL_DEPTH_BUFFER_BIT
) {
1248 dst
->Depth
= src
->Depth
;
1250 if (mask
& GL_ENABLE_BIT
) {
1253 if (mask
& GL_EVAL_BIT
) {
1255 dst
->Eval
= src
->Eval
;
1257 if (mask
& GL_FOG_BIT
) {
1259 dst
->Fog
= src
->Fog
;
1261 if (mask
& GL_HINT_BIT
) {
1263 dst
->Hint
= src
->Hint
;
1265 if (mask
& GL_LIGHTING_BIT
) {
1267 /* begin with memcpy */
1268 dst
->Light
= src
->Light
;
1269 /* fixup linked lists to prevent pointer insanity */
1270 make_empty_list( &(dst
->Light
.EnabledList
) );
1271 for (i
= 0; i
< MAX_LIGHTS
; i
++) {
1272 if (dst
->Light
.Light
[i
].Enabled
) {
1273 insert_at_tail(&(dst
->Light
.EnabledList
), &(dst
->Light
.Light
[i
]));
1277 if (mask
& GL_LINE_BIT
) {
1279 dst
->Line
= src
->Line
;
1281 if (mask
& GL_LIST_BIT
) {
1283 dst
->List
= src
->List
;
1285 if (mask
& GL_PIXEL_MODE_BIT
) {
1287 dst
->Pixel
= src
->Pixel
;
1289 if (mask
& GL_POINT_BIT
) {
1291 dst
->Point
= src
->Point
;
1293 if (mask
& GL_POLYGON_BIT
) {
1295 dst
->Polygon
= src
->Polygon
;
1297 if (mask
& GL_POLYGON_STIPPLE_BIT
) {
1298 /* Use loop instead of memcpy due to problem with Portland Group's
1299 * C compiler. Reported by John Stone.
1302 for (i
= 0; i
< 32; i
++) {
1303 dst
->PolygonStipple
[i
] = src
->PolygonStipple
[i
];
1306 if (mask
& GL_SCISSOR_BIT
) {
1308 dst
->Scissor
= src
->Scissor
;
1310 if (mask
& GL_STENCIL_BUFFER_BIT
) {
1312 dst
->Stencil
= src
->Stencil
;
1314 if (mask
& GL_TEXTURE_BIT
) {
1315 /* Cannot memcpy because of pointers */
1316 _mesa_copy_texture_state(src
, dst
);
1318 if (mask
& GL_TRANSFORM_BIT
) {
1320 dst
->Transform
= src
->Transform
;
1322 if (mask
& GL_VIEWPORT_BIT
) {
1323 /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
1324 dst
->Viewport
.X
= src
->Viewport
.X
;
1325 dst
->Viewport
.Y
= src
->Viewport
.Y
;
1326 dst
->Viewport
.Width
= src
->Viewport
.Width
;
1327 dst
->Viewport
.Height
= src
->Viewport
.Height
;
1328 dst
->Viewport
.Near
= src
->Viewport
.Near
;
1329 dst
->Viewport
.Far
= src
->Viewport
.Far
;
1330 _math_matrix_copy(&dst
->Viewport
._WindowMap
, &src
->Viewport
._WindowMap
);
1333 /* XXX FIXME: Call callbacks?
1335 dst
->NewState
= _NEW_ALL
;
1336 dst
->NewDriverState
= ~0;
1341 * Check if the given context can render into the given framebuffer
1342 * by checking visual attributes.
1344 * Most of these tests could go away because Mesa is now pretty flexible
1345 * in terms of mixing rendering contexts with framebuffers. As long
1346 * as RGB vs. CI mode agree, we're probably good.
1348 * \return GL_TRUE if compatible, GL_FALSE otherwise.
1351 check_compatible(const struct gl_context
*ctx
,
1352 const struct gl_framebuffer
*buffer
)
1354 const struct gl_config
*ctxvis
= &ctx
->Visual
;
1355 const struct gl_config
*bufvis
= &buffer
->Visual
;
1357 if (buffer
== _mesa_get_incomplete_framebuffer())
1361 /* disabling this fixes the fgl_glxgears pbuffer demo */
1362 if (ctxvis
->doubleBufferMode
&& !bufvis
->doubleBufferMode
)
1365 if (ctxvis
->stereoMode
&& !bufvis
->stereoMode
)
1367 if (ctxvis
->haveAccumBuffer
&& !bufvis
->haveAccumBuffer
)
1369 if (ctxvis
->haveDepthBuffer
&& !bufvis
->haveDepthBuffer
)
1371 if (ctxvis
->haveStencilBuffer
&& !bufvis
->haveStencilBuffer
)
1373 if (ctxvis
->redMask
&& ctxvis
->redMask
!= bufvis
->redMask
)
1375 if (ctxvis
->greenMask
&& ctxvis
->greenMask
!= bufvis
->greenMask
)
1377 if (ctxvis
->blueMask
&& ctxvis
->blueMask
!= bufvis
->blueMask
)
1380 /* disabled (see bug 11161) */
1381 if (ctxvis
->depthBits
&& ctxvis
->depthBits
!= bufvis
->depthBits
)
1384 if (ctxvis
->stencilBits
&& ctxvis
->stencilBits
!= bufvis
->stencilBits
)
1392 * Do one-time initialization for the given framebuffer. Specifically,
1393 * ask the driver for the window's current size and update the framebuffer
1395 * Really, the device driver should totally take care of this.
1398 initialize_framebuffer_size(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
1400 GLuint width
, height
;
1401 if (ctx
->Driver
.GetBufferSize
) {
1402 ctx
->Driver
.GetBufferSize(fb
, &width
, &height
);
1403 if (ctx
->Driver
.ResizeBuffers
)
1404 ctx
->Driver
.ResizeBuffers(ctx
, fb
, width
, height
);
1405 fb
->Initialized
= GL_TRUE
;
1411 * Check if the viewport/scissor size has not yet been initialized.
1412 * Initialize the size if the given width and height are non-zero.
1415 _mesa_check_init_viewport(struct gl_context
*ctx
, GLuint width
, GLuint height
)
1417 if (!ctx
->ViewportInitialized
&& width
> 0 && height
> 0) {
1418 /* Note: set flag here, before calling _mesa_set_viewport(), to prevent
1419 * potential infinite recursion.
1421 ctx
->ViewportInitialized
= GL_TRUE
;
1422 _mesa_set_viewport(ctx
, 0, 0, width
, height
);
1423 _mesa_set_scissor(ctx
, 0, 0, width
, height
);
1429 * Bind the given context to the given drawBuffer and readBuffer and
1430 * make it the current context for the calling thread.
1431 * We'll render into the drawBuffer and read pixels from the
1432 * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1434 * We check that the context's and framebuffer's visuals are compatible
1435 * and return immediately if they're not.
1437 * \param newCtx the new GL context. If NULL then there will be no current GL
1439 * \param drawBuffer the drawing framebuffer
1440 * \param readBuffer the reading framebuffer
1443 _mesa_make_current( struct gl_context
*newCtx
,
1444 struct gl_framebuffer
*drawBuffer
,
1445 struct gl_framebuffer
*readBuffer
)
1447 GET_CURRENT_CONTEXT(curCtx
);
1449 if (MESA_VERBOSE
& VERBOSE_API
)
1450 _mesa_debug(newCtx
, "_mesa_make_current()\n");
1452 /* Check that the context's and framebuffer's visuals are compatible.
1454 if (newCtx
&& drawBuffer
&& newCtx
->WinSysDrawBuffer
!= drawBuffer
) {
1455 if (!check_compatible(newCtx
, drawBuffer
)) {
1456 _mesa_warning(newCtx
,
1457 "MakeCurrent: incompatible visuals for context and drawbuffer");
1461 if (newCtx
&& readBuffer
&& newCtx
->WinSysReadBuffer
!= readBuffer
) {
1462 if (!check_compatible(newCtx
, readBuffer
)) {
1463 _mesa_warning(newCtx
,
1464 "MakeCurrent: incompatible visuals for context and readbuffer");
1470 (curCtx
->WinSysDrawBuffer
|| curCtx
->WinSysReadBuffer
) &&
1471 /* make sure this context is valid for flushing */
1473 _mesa_flush(curCtx
);
1475 /* We used to call _glapi_check_multithread() here. Now do it in drivers */
1476 _glapi_set_context((void *) newCtx
);
1477 ASSERT(_mesa_get_current_context() == newCtx
);
1480 _glapi_set_dispatch(NULL
); /* none current */
1483 _glapi_set_dispatch(newCtx
->CurrentDispatch
);
1485 if (drawBuffer
&& readBuffer
) {
1486 ASSERT(_mesa_is_winsys_fbo(drawBuffer
));
1487 ASSERT(_mesa_is_winsys_fbo(readBuffer
));
1488 _mesa_reference_framebuffer(&newCtx
->WinSysDrawBuffer
, drawBuffer
);
1489 _mesa_reference_framebuffer(&newCtx
->WinSysReadBuffer
, readBuffer
);
1492 * Only set the context's Draw/ReadBuffer fields if they're NULL
1493 * or not bound to a user-created FBO.
1495 if (!newCtx
->DrawBuffer
|| _mesa_is_winsys_fbo(newCtx
->DrawBuffer
)) {
1496 _mesa_reference_framebuffer(&newCtx
->DrawBuffer
, drawBuffer
);
1497 /* Update the FBO's list of drawbuffers/renderbuffers.
1498 * For winsys FBOs this comes from the GL state (which may have
1499 * changed since the last time this FBO was bound).
1501 _mesa_update_draw_buffers(newCtx
);
1503 if (!newCtx
->ReadBuffer
|| _mesa_is_winsys_fbo(newCtx
->ReadBuffer
)) {
1504 _mesa_reference_framebuffer(&newCtx
->ReadBuffer
, readBuffer
);
1507 /* XXX only set this flag if we're really changing the draw/read
1508 * framebuffer bindings.
1510 newCtx
->NewState
|= _NEW_BUFFERS
;
1513 /* We want to get rid of these lines: */
1514 if (!drawBuffer
->Initialized
) {
1515 initialize_framebuffer_size(newCtx
, drawBuffer
);
1517 if (readBuffer
!= drawBuffer
&& !readBuffer
->Initialized
) {
1518 initialize_framebuffer_size(newCtx
, readBuffer
);
1521 _mesa_resizebuffers(newCtx
);
1523 /* We want the drawBuffer and readBuffer to be initialized by
1525 * This generally means the Width and Height match the actual
1526 * window size and the renderbuffers (both hardware and software
1527 * based) are allocated to match. The later can generally be
1528 * done with a call to _mesa_resize_framebuffer().
1530 * It's theoretically possible for a buffer to have zero width
1531 * or height, but for now, assert check that the driver did what's
1534 ASSERT(drawBuffer
->Width
> 0);
1535 ASSERT(drawBuffer
->Height
> 0);
1539 _mesa_check_init_viewport(newCtx
,
1540 drawBuffer
->Width
, drawBuffer
->Height
);
1544 if (newCtx
->FirstTimeCurrent
) {
1545 assert(newCtx
->Version
> 0);
1547 newCtx
->Extensions
.String
= _mesa_make_extension_string(newCtx
);
1549 check_context_limits(newCtx
);
1551 /* We can use this to help debug user's problems. Tell them to set
1552 * the MESA_INFO env variable before running their app. Then the
1553 * first time each context is made current we'll print some useful
1556 if (_mesa_getenv("MESA_INFO")) {
1560 newCtx
->FirstTimeCurrent
= GL_FALSE
;
1569 * Make context 'ctx' share the display lists, textures and programs
1570 * that are associated with 'ctxToShare'.
1571 * Any display lists, textures or programs associated with 'ctx' will
1572 * be deleted if nobody else is sharing them.
1575 _mesa_share_state(struct gl_context
*ctx
, struct gl_context
*ctxToShare
)
1577 if (ctx
&& ctxToShare
&& ctx
->Shared
&& ctxToShare
->Shared
) {
1578 struct gl_shared_state
*oldShared
= NULL
;
1580 /* save ref to old state to prevent it from being deleted immediately */
1581 _mesa_reference_shared_state(ctx
, &oldShared
, ctx
->Shared
);
1583 /* update ctx's Shared pointer */
1584 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, ctxToShare
->Shared
);
1586 update_default_objects(ctx
);
1588 /* release the old shared state */
1589 _mesa_reference_shared_state(ctx
, &oldShared
, NULL
);
1601 * \return pointer to the current GL context for this thread.
1603 * Calls _glapi_get_context(). This isn't the fastest way to get the current
1604 * context. If you need speed, see the #GET_CURRENT_CONTEXT macro in
1608 _mesa_get_current_context( void )
1610 return (struct gl_context
*) _glapi_get_context();
1615 * Get context's current API dispatch table.
1617 * It'll either be the immediate-mode execute dispatcher or the display list
1618 * compile dispatcher.
1620 * \param ctx GL context.
1622 * \return pointer to dispatch_table.
1624 * Simply returns __struct gl_contextRec::CurrentDispatch.
1626 struct _glapi_table
*
1627 _mesa_get_dispatch(struct gl_context
*ctx
)
1629 return ctx
->CurrentDispatch
;
1635 /**********************************************************************/
1636 /** \name Miscellaneous functions */
1637 /**********************************************************************/
1643 * \param ctx GL context.
1644 * \param error error code.
1646 * Records the given error code and call the driver's dd_function_table::Error
1647 * function if defined.
1650 * This is called via _mesa_error().
1653 _mesa_record_error(struct gl_context
*ctx
, GLenum error
)
1658 if (ctx
->ErrorValue
== GL_NO_ERROR
) {
1659 ctx
->ErrorValue
= error
;
1665 * Flush commands and wait for completion.
1668 _mesa_finish(struct gl_context
*ctx
)
1670 FLUSH_VERTICES( ctx
, 0 );
1671 FLUSH_CURRENT( ctx
, 0 );
1672 if (ctx
->Driver
.Finish
) {
1673 ctx
->Driver
.Finish(ctx
);
1682 _mesa_flush(struct gl_context
*ctx
)
1684 FLUSH_VERTICES( ctx
, 0 );
1685 FLUSH_CURRENT( ctx
, 0 );
1686 if (ctx
->Driver
.Flush
) {
1687 ctx
->Driver
.Flush(ctx
);
1694 * Execute glFinish().
1696 * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1697 * dd_function_table::Finish driver callback, if not NULL.
1702 GET_CURRENT_CONTEXT(ctx
);
1703 ASSERT_OUTSIDE_BEGIN_END(ctx
);
1709 * Execute glFlush().
1711 * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1712 * dd_function_table::Flush driver callback, if not NULL.
1717 GET_CURRENT_CONTEXT(ctx
);
1718 ASSERT_OUTSIDE_BEGIN_END(ctx
);
1724 * Set mvp_with_dp4 flag. If a driver has a preference for DP4 over
1725 * MUL/MAD, or vice versa, call this function to register that.
1726 * Otherwise we default to MUL/MAD.
1729 _mesa_set_mvp_with_dp4( struct gl_context
*ctx
,
1732 ctx
->mvp_with_dp4
= flag
;
1736 * ARB_blend_func_extended - ERRORS section
1737 * "The error INVALID_OPERATION is generated by Begin or any procedure that
1738 * implicitly calls Begin if any draw buffer has a blend function requiring the
1739 * second color input (SRC1_COLOR, ONE_MINUS_SRC1_COLOR, SRC1_ALPHA or
1740 * ONE_MINUS_SRC1_ALPHA), and a framebuffer is bound that has more than
1741 * the value of MAX_DUAL_SOURCE_DRAW_BUFFERS-1 active color attachements."
1744 _mesa_check_blend_func_error(struct gl_context
*ctx
)
1747 for (i
= ctx
->Const
.MaxDualSourceDrawBuffers
;
1748 i
< ctx
->DrawBuffer
->_NumColorDrawBuffers
;
1750 if (ctx
->Color
.Blend
[i
]._UsesDualSrc
) {
1751 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1752 "dual source blend on illegal attachment");
1760 * Prior to drawing anything with glBegin, glDrawArrays, etc. this function
1761 * is called to see if it's valid to render. This involves checking that
1762 * the current shader is valid and the framebuffer is complete.
1763 * If an error is detected it'll be recorded here.
1764 * \return GL_TRUE if OK to render, GL_FALSE if not
1767 _mesa_valid_to_render(struct gl_context
*ctx
, const char *where
)
1769 bool vert_from_glsl_shader
= false;
1770 bool geom_from_glsl_shader
= false;
1771 bool frag_from_glsl_shader
= false;
1773 /* This depends on having up to date derived state (shaders) */
1775 _mesa_update_state(ctx
);
1777 if (ctx
->Shader
.CurrentVertexProgram
) {
1778 vert_from_glsl_shader
= true;
1780 if (!ctx
->Shader
.CurrentVertexProgram
->LinkStatus
) {
1781 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1782 "%s(shader not linked)", where
);
1785 #if 0 /* not normally enabled */
1788 if (!_mesa_validate_shader_program(ctx
,
1789 ctx
->Shader
.CurrentVertexProgram
,
1791 _mesa_warning(ctx
, "Shader program %u is invalid: %s",
1792 ctx
->Shader
.CurrentVertexProgram
->Name
, errMsg
);
1798 if (ctx
->Shader
.CurrentGeometryProgram
) {
1799 geom_from_glsl_shader
= true;
1801 if (!ctx
->Shader
.CurrentGeometryProgram
->LinkStatus
) {
1802 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1803 "%s(shader not linked)", where
);
1806 #if 0 /* not normally enabled */
1809 if (!_mesa_validate_shader_program(ctx
,
1810 ctx
->Shader
.CurrentGeometryProgram
,
1812 _mesa_warning(ctx
, "Shader program %u is invalid: %s",
1813 ctx
->Shader
.CurrentGeometryProgram
->Name
, errMsg
);
1819 if (ctx
->Shader
.CurrentFragmentProgram
) {
1820 frag_from_glsl_shader
= true;
1822 if (!ctx
->Shader
.CurrentFragmentProgram
->LinkStatus
) {
1823 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1824 "%s(shader not linked)", where
);
1827 #if 0 /* not normally enabled */
1830 if (!_mesa_validate_shader_program(ctx
,
1831 ctx
->Shader
.CurrentFragmentProgram
,
1833 _mesa_warning(ctx
, "Shader program %u is invalid: %s",
1834 ctx
->Shader
.CurrentFragmentProgram
->Name
, errMsg
);
1840 /* Any shader stages that are not supplied by the GLSL shader and have
1841 * assembly shaders enabled must now be validated.
1843 if (!vert_from_glsl_shader
1844 && ctx
->VertexProgram
.Enabled
&& !ctx
->VertexProgram
._Enabled
) {
1845 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1846 "%s(vertex program not valid)", where
);
1850 /* FINISHME: If GL_NV_geometry_program4 is ever supported, the current
1851 * FINISHME: geometry program should validated here.
1853 (void) geom_from_glsl_shader
;
1855 if (!frag_from_glsl_shader
) {
1856 if (ctx
->FragmentProgram
.Enabled
&& !ctx
->FragmentProgram
._Enabled
) {
1857 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1858 "%s(fragment program not valid)", where
);
1862 /* If drawing to integer-valued color buffers, there must be an
1863 * active fragment shader (GL_EXT_texture_integer).
1865 if (ctx
->DrawBuffer
&& ctx
->DrawBuffer
->_IntegerColor
) {
1866 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1867 "%s(integer format but no fragment shader)", where
);
1872 if (ctx
->DrawBuffer
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
1873 _mesa_error(ctx
, GL_INVALID_FRAMEBUFFER_OPERATION_EXT
,
1874 "%s(incomplete framebuffer)", where
);
1878 if (_mesa_check_blend_func_error(ctx
) == GL_FALSE
) {
1883 if (ctx
->Shader
.Flags
& GLSL_LOG
) {
1884 struct gl_shader_program
*shProg
[MESA_SHADER_TYPES
];
1887 shProg
[MESA_SHADER_VERTEX
] = ctx
->Shader
.CurrentVertexProgram
;
1888 shProg
[MESA_SHADER_GEOMETRY
] = ctx
->Shader
.CurrentGeometryProgram
;
1889 shProg
[MESA_SHADER_FRAGMENT
] = ctx
->Shader
.CurrentFragmentProgram
;
1891 for (i
= 0; i
< MESA_SHADER_TYPES
; i
++) {
1892 if (shProg
[i
] == NULL
|| shProg
[i
]->_Used
1893 || shProg
[i
]->_LinkedShaders
[i
] == NULL
)
1896 /* This is the first time this shader is being used.
1897 * Append shader's constants/uniforms to log file.
1899 * Only log data for the program target that matches the shader
1900 * target. It's possible to have a program bound to the vertex
1901 * shader target that also supplied a fragment shader. If that
1902 * program isn't also bound to the fragment shader target we don't
1903 * want to log its fragment data.
1905 _mesa_append_uniforms_to_file(shProg
[i
]->_LinkedShaders
[i
]);
1908 for (i
= 0; i
< MESA_SHADER_TYPES
; i
++) {
1909 if (shProg
[i
] != NULL
)
1910 shProg
[i
]->_Used
= GL_TRUE
;