2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
5 * Copyright (C) 2008 VMware, Inc. All Rights Reserved.
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:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
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 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * OTHER DEALINGS IN THE SOFTWARE.
28 * Mesa context/visual/framebuffer management functions.
33 * \mainpage Mesa Main Module
35 * \section MainIntroduction Introduction
37 * The Mesa Main module consists of all the files in the main/ directory.
38 * Among the features of this module are:
40 * <LI> Structures to represent most GL state </LI>
41 * <LI> State set/get functions </LI>
42 * <LI> Display lists </LI>
43 * <LI> Texture unit, object and image handling </LI>
44 * <LI> Matrix and attribute stacks </LI>
47 * Other modules are responsible for API dispatch, vertex transformation,
48 * point/line/triangle setup, rasterization, vertex array caching,
49 * vertex/fragment programs/shaders, etc.
52 * \section AboutDoxygen About Doxygen
54 * If you're viewing this information as Doxygen-generated HTML you'll
55 * see the documentation index at the top of this page.
57 * The first line lists the Mesa source code modules.
58 * The second line lists the indexes available for viewing the documentation
61 * Selecting the <b>Main page</b> link will display a summary of the module
64 * Selecting <b>Data Structures</b> will list all C structures.
66 * Selecting the <b>File List</b> link will list all the source files in
68 * Selecting a filename will show a list of all functions defined in that file.
70 * Selecting the <b>Data Fields</b> link will display a list of all
71 * documented structure members.
73 * Selecting the <b>Globals</b> link will display a list
74 * of all functions, structures, global variables and macros in the module.
83 #include "api_loopback.h"
88 #include "bufferobj.h"
95 #include "extensions.h"
100 #include "framebuffer.h"
107 #include "multisample.h"
108 #include "performance_monitor.h"
109 #include "pipelineobj.h"
111 #include "pixelstore.h"
114 #include "queryobj.h"
120 #include "shaderobj.h"
121 #include "simple_list.h"
124 #include "texcompress_s3tc.h"
125 #include "texstate.h"
126 #include "transformfeedback.h"
130 #include "viewport.h"
132 #include "program/program.h"
133 #include "program/prog_print.h"
134 #include "math/m_matrix.h"
135 #include "main/dispatch.h" /* for _gloffset_COUNT */
138 #include "sparc/sparc.h"
141 #include "glsl_parser_extras.h"
146 int MESA_VERBOSE
= 0;
149 #ifndef MESA_DEBUG_FLAGS
150 int MESA_DEBUG_FLAGS
= 0;
154 /* ubyte -> float conversion */
155 GLfloat _mesa_ubyte_to_float_color_tab
[256];
160 * Swap buffers notification callback.
162 * \param ctx GL context.
164 * Called by window system just before swapping buffers.
165 * We have to finish any pending rendering.
168 _mesa_notifySwapBuffers(struct gl_context
*ctx
)
170 if (MESA_VERBOSE
& VERBOSE_SWAPBUFFERS
)
171 _mesa_debug(ctx
, "SwapBuffers\n");
172 FLUSH_CURRENT( ctx
, 0 );
173 if (ctx
->Driver
.Flush
) {
174 ctx
->Driver
.Flush(ctx
);
179 /**********************************************************************/
180 /** \name GL Visual allocation/destruction */
181 /**********************************************************************/
185 * Allocates a struct gl_config structure and initializes it via
186 * _mesa_initialize_visual().
188 * \param dbFlag double buffering
189 * \param stereoFlag stereo buffer
190 * \param depthBits requested bits per depth buffer value. Any value in [0, 32]
191 * is acceptable but the actual depth type will be GLushort or GLuint as
193 * \param stencilBits requested minimum bits per stencil buffer value
194 * \param accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits number
195 * of bits per color component in accum buffer.
196 * \param indexBits number of bits per pixel if \p rgbFlag is GL_FALSE
197 * \param redBits number of bits per color component in frame buffer for RGB(A)
198 * mode. We always use 8 in core Mesa though.
199 * \param greenBits same as above.
200 * \param blueBits same as above.
201 * \param alphaBits same as above.
202 * \param numSamples not really used.
204 * \return pointer to new struct gl_config or NULL if requested parameters
207 * \note Need to add params for level and numAuxBuffers (at least)
210 _mesa_create_visual( GLboolean dbFlag
,
211 GLboolean stereoFlag
,
219 GLint accumGreenBits
,
221 GLint accumAlphaBits
,
224 struct gl_config
*vis
= CALLOC_STRUCT(gl_config
);
226 if (!_mesa_initialize_visual(vis
, dbFlag
, stereoFlag
,
227 redBits
, greenBits
, blueBits
, alphaBits
,
228 depthBits
, stencilBits
,
229 accumRedBits
, accumGreenBits
,
230 accumBlueBits
, accumAlphaBits
,
241 * Makes some sanity checks and fills in the fields of the struct
242 * gl_config object with the given parameters. If the caller needs to
243 * set additional fields, he should just probably init the whole
244 * gl_config object himself.
246 * \return GL_TRUE on success, or GL_FALSE on failure.
248 * \sa _mesa_create_visual() above for the parameter description.
251 _mesa_initialize_visual( struct gl_config
*vis
,
253 GLboolean stereoFlag
,
261 GLint accumGreenBits
,
263 GLint accumAlphaBits
,
268 if (depthBits
< 0 || depthBits
> 32) {
271 if (stencilBits
< 0 || stencilBits
> 8) {
274 assert(accumRedBits
>= 0);
275 assert(accumGreenBits
>= 0);
276 assert(accumBlueBits
>= 0);
277 assert(accumAlphaBits
>= 0);
279 vis
->rgbMode
= GL_TRUE
;
280 vis
->doubleBufferMode
= dbFlag
;
281 vis
->stereoMode
= stereoFlag
;
283 vis
->redBits
= redBits
;
284 vis
->greenBits
= greenBits
;
285 vis
->blueBits
= blueBits
;
286 vis
->alphaBits
= alphaBits
;
287 vis
->rgbBits
= redBits
+ greenBits
+ blueBits
;
290 vis
->depthBits
= depthBits
;
291 vis
->stencilBits
= stencilBits
;
293 vis
->accumRedBits
= accumRedBits
;
294 vis
->accumGreenBits
= accumGreenBits
;
295 vis
->accumBlueBits
= accumBlueBits
;
296 vis
->accumAlphaBits
= accumAlphaBits
;
298 vis
->haveAccumBuffer
= accumRedBits
> 0;
299 vis
->haveDepthBuffer
= depthBits
> 0;
300 vis
->haveStencilBuffer
= stencilBits
> 0;
302 vis
->numAuxBuffers
= 0;
304 vis
->sampleBuffers
= numSamples
> 0 ? 1 : 0;
305 vis
->samples
= numSamples
;
312 * Destroy a visual and free its memory.
316 * Frees the visual structure.
319 _mesa_destroy_visual( struct gl_config
*vis
)
327 /**********************************************************************/
328 /** \name Context allocation, initialization, destroying
330 * The purpose of the most initialization functions here is to provide the
331 * default state values according to the OpenGL specification.
333 /**********************************************************************/
338 * This is lame. gdb only seems to recognize enum types that are
339 * actually used somewhere. We want to be able to print/use enum
340 * values such as TEXTURE_2D_INDEX in gdb. But we don't actually use
341 * the gl_texture_index type anywhere. Thus, this lame function.
344 dummy_enum_func(void)
346 gl_buffer_index bi
= BUFFER_FRONT_LEFT
;
347 gl_face_index fi
= FACE_POS_X
;
348 gl_frag_result fr
= FRAG_RESULT_DEPTH
;
349 gl_texture_index ti
= TEXTURE_2D_ARRAY_INDEX
;
350 gl_vert_attrib va
= VERT_ATTRIB_POS
;
351 gl_varying_slot vs
= VARYING_SLOT_POS
;
363 * One-time initialization mutex lock.
365 * \sa Used by one_time_init().
367 mtx_t OneTimeLock
= _MTX_INITIALIZER_NP
;
372 * Calls all the various one-time-init functions in Mesa.
374 * While holding a global mutex lock, calls several initialization functions,
375 * and sets the glapi callbacks if the \c MESA_DEBUG environment variable is
381 one_time_init( struct gl_context
*ctx
)
383 static GLbitfield api_init_mask
= 0x0;
385 mtx_lock(&OneTimeLock
);
387 /* truly one-time init */
388 if (!api_init_mask
) {
391 /* do some implementation tests */
392 assert( sizeof(GLbyte
) == 1 );
393 assert( sizeof(GLubyte
) == 1 );
394 assert( sizeof(GLshort
) == 2 );
395 assert( sizeof(GLushort
) == 2 );
396 assert( sizeof(GLint
) == 4 );
397 assert( sizeof(GLuint
) == 4 );
399 _mesa_get_cpu_features();
401 for (i
= 0; i
< 256; i
++) {
402 _mesa_ubyte_to_float_color_tab
[i
] = (float) i
/ 255.0F
;
405 #if defined(DEBUG) && defined(__DATE__) && defined(__TIME__)
406 if (MESA_VERBOSE
!= 0) {
407 _mesa_debug(ctx
, "Mesa %s DEBUG build %s %s\n",
408 PACKAGE_VERSION
, __DATE__
, __TIME__
);
413 _mesa_test_formats();
417 /* per-API one-time init */
418 if (!(api_init_mask
& (1 << ctx
->API
))) {
419 _mesa_init_get_hash(ctx
);
421 _mesa_init_remap_table();
424 api_init_mask
|= 1 << ctx
->API
;
426 mtx_unlock(&OneTimeLock
);
428 /* Hopefully atexit() is widely available. If not, we may need some
431 atexit(_mesa_destroy_shader_compiler
);
438 * Initialize fields of gl_current_attrib (aka ctx->Current.*)
441 _mesa_init_current(struct gl_context
*ctx
)
445 /* Init all to (0,0,0,1) */
446 for (i
= 0; i
< Elements(ctx
->Current
.Attrib
); i
++) {
447 ASSIGN_4V( ctx
->Current
.Attrib
[i
], 0.0, 0.0, 0.0, 1.0 );
450 /* redo special cases: */
451 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_WEIGHT
], 1.0, 0.0, 0.0, 0.0 );
452 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_NORMAL
], 0.0, 0.0, 1.0, 1.0 );
453 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_COLOR0
], 1.0, 1.0, 1.0, 1.0 );
454 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_COLOR1
], 0.0, 0.0, 0.0, 1.0 );
455 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_COLOR_INDEX
], 1.0, 0.0, 0.0, 1.0 );
456 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_EDGEFLAG
], 1.0, 0.0, 0.0, 1.0 );
461 * Init vertex/fragment/geometry program limits.
462 * Important: drivers should override these with actual limits.
465 init_program_limits(struct gl_context
*ctx
, gl_shader_stage stage
,
466 struct gl_program_constants
*prog
)
468 prog
->MaxInstructions
= MAX_PROGRAM_INSTRUCTIONS
;
469 prog
->MaxAluInstructions
= MAX_PROGRAM_INSTRUCTIONS
;
470 prog
->MaxTexInstructions
= MAX_PROGRAM_INSTRUCTIONS
;
471 prog
->MaxTexIndirections
= MAX_PROGRAM_INSTRUCTIONS
;
472 prog
->MaxTemps
= MAX_PROGRAM_TEMPS
;
473 prog
->MaxEnvParams
= MAX_PROGRAM_ENV_PARAMS
;
474 prog
->MaxLocalParams
= MAX_PROGRAM_LOCAL_PARAMS
;
475 prog
->MaxAddressOffset
= MAX_PROGRAM_LOCAL_PARAMS
;
478 case MESA_SHADER_VERTEX
:
479 prog
->MaxParameters
= MAX_VERTEX_PROGRAM_PARAMS
;
480 prog
->MaxAttribs
= MAX_VERTEX_GENERIC_ATTRIBS
;
481 prog
->MaxAddressRegs
= MAX_VERTEX_PROGRAM_ADDRESS_REGS
;
482 prog
->MaxUniformComponents
= 4 * MAX_UNIFORMS
;
483 prog
->MaxInputComponents
= 0; /* value not used */
484 prog
->MaxOutputComponents
= 16 * 4; /* old limit not to break tnl and swrast */
486 case MESA_SHADER_FRAGMENT
:
487 prog
->MaxParameters
= MAX_NV_FRAGMENT_PROGRAM_PARAMS
;
488 prog
->MaxAttribs
= MAX_NV_FRAGMENT_PROGRAM_INPUTS
;
489 prog
->MaxAddressRegs
= MAX_FRAGMENT_PROGRAM_ADDRESS_REGS
;
490 prog
->MaxUniformComponents
= 4 * MAX_UNIFORMS
;
491 prog
->MaxInputComponents
= 16 * 4; /* old limit not to break tnl and swrast */
492 prog
->MaxOutputComponents
= 0; /* value not used */
494 case MESA_SHADER_GEOMETRY
:
495 prog
->MaxParameters
= MAX_VERTEX_PROGRAM_PARAMS
;
496 prog
->MaxAttribs
= MAX_VERTEX_GENERIC_ATTRIBS
;
497 prog
->MaxAddressRegs
= MAX_VERTEX_PROGRAM_ADDRESS_REGS
;
498 prog
->MaxUniformComponents
= 4 * MAX_UNIFORMS
;
499 prog
->MaxInputComponents
= 16 * 4; /* old limit not to break tnl and swrast */
500 prog
->MaxOutputComponents
= 16 * 4; /* old limit not to break tnl and swrast */
502 case MESA_SHADER_COMPUTE
:
503 prog
->MaxParameters
= 0; /* not meaningful for compute shaders */
504 prog
->MaxAttribs
= 0; /* not meaningful for compute shaders */
505 prog
->MaxAddressRegs
= 0; /* not meaningful for compute shaders */
506 prog
->MaxUniformComponents
= 4 * MAX_UNIFORMS
;
507 prog
->MaxInputComponents
= 0; /* not meaningful for compute shaders */
508 prog
->MaxOutputComponents
= 0; /* not meaningful for compute shaders */
511 assert(0 && "Bad shader stage in init_program_limits()");
514 /* Set the native limits to zero. This implies that there is no native
515 * support for shaders. Let the drivers fill in the actual values.
517 prog
->MaxNativeInstructions
= 0;
518 prog
->MaxNativeAluInstructions
= 0;
519 prog
->MaxNativeTexInstructions
= 0;
520 prog
->MaxNativeTexIndirections
= 0;
521 prog
->MaxNativeAttribs
= 0;
522 prog
->MaxNativeTemps
= 0;
523 prog
->MaxNativeAddressRegs
= 0;
524 prog
->MaxNativeParameters
= 0;
526 /* Set GLSL datatype range/precision info assuming IEEE float values.
527 * Drivers should override these defaults as needed.
529 prog
->MediumFloat
.RangeMin
= 127;
530 prog
->MediumFloat
.RangeMax
= 127;
531 prog
->MediumFloat
.Precision
= 23;
532 prog
->LowFloat
= prog
->HighFloat
= prog
->MediumFloat
;
534 /* Assume ints are stored as floats for now, since this is the least-common
535 * denominator. The OpenGL ES spec implies (page 132) that the precision
536 * of integer types should be 0. Practically speaking, IEEE
537 * single-precision floating point values can only store integers in the
538 * range [-0x01000000, 0x01000000] without loss of precision.
540 prog
->MediumInt
.RangeMin
= 24;
541 prog
->MediumInt
.RangeMax
= 24;
542 prog
->MediumInt
.Precision
= 0;
543 prog
->LowInt
= prog
->HighInt
= prog
->MediumInt
;
545 prog
->MaxUniformBlocks
= 12;
546 prog
->MaxCombinedUniformComponents
= (prog
->MaxUniformComponents
+
547 ctx
->Const
.MaxUniformBlockSize
/ 4 *
548 prog
->MaxUniformBlocks
);
550 prog
->MaxAtomicBuffers
= 0;
551 prog
->MaxAtomicCounters
= 0;
556 * Initialize fields of gl_constants (aka ctx->Const.*).
557 * Use defaults from config.h. The device drivers will often override
558 * some of these values (such as number of texture units).
561 _mesa_init_constants(struct gl_context
*ctx
)
566 /* Constants, may be overriden (usually only reduced) by device drivers */
567 ctx
->Const
.MaxTextureMbytes
= MAX_TEXTURE_MBYTES
;
568 ctx
->Const
.MaxTextureLevels
= MAX_TEXTURE_LEVELS
;
569 ctx
->Const
.Max3DTextureLevels
= MAX_3D_TEXTURE_LEVELS
;
570 ctx
->Const
.MaxCubeTextureLevels
= MAX_CUBE_TEXTURE_LEVELS
;
571 ctx
->Const
.MaxTextureRectSize
= MAX_TEXTURE_RECT_SIZE
;
572 ctx
->Const
.MaxArrayTextureLayers
= MAX_ARRAY_TEXTURE_LAYERS
;
573 ctx
->Const
.MaxTextureCoordUnits
= MAX_TEXTURE_COORD_UNITS
;
574 ctx
->Const
.Program
[MESA_SHADER_FRAGMENT
].MaxTextureImageUnits
= MAX_TEXTURE_IMAGE_UNITS
;
575 ctx
->Const
.MaxTextureUnits
= MIN2(ctx
->Const
.MaxTextureCoordUnits
,
576 ctx
->Const
.Program
[MESA_SHADER_FRAGMENT
].MaxTextureImageUnits
);
577 ctx
->Const
.MaxTextureMaxAnisotropy
= MAX_TEXTURE_MAX_ANISOTROPY
;
578 ctx
->Const
.MaxTextureLodBias
= MAX_TEXTURE_LOD_BIAS
;
579 ctx
->Const
.MaxTextureBufferSize
= 65536;
580 ctx
->Const
.TextureBufferOffsetAlignment
= 1;
581 ctx
->Const
.MaxArrayLockSize
= MAX_ARRAY_LOCK_SIZE
;
582 ctx
->Const
.SubPixelBits
= SUB_PIXEL_BITS
;
583 ctx
->Const
.MinPointSize
= MIN_POINT_SIZE
;
584 ctx
->Const
.MaxPointSize
= MAX_POINT_SIZE
;
585 ctx
->Const
.MinPointSizeAA
= MIN_POINT_SIZE
;
586 ctx
->Const
.MaxPointSizeAA
= MAX_POINT_SIZE
;
587 ctx
->Const
.PointSizeGranularity
= (GLfloat
) POINT_SIZE_GRANULARITY
;
588 ctx
->Const
.MinLineWidth
= MIN_LINE_WIDTH
;
589 ctx
->Const
.MaxLineWidth
= MAX_LINE_WIDTH
;
590 ctx
->Const
.MinLineWidthAA
= MIN_LINE_WIDTH
;
591 ctx
->Const
.MaxLineWidthAA
= MAX_LINE_WIDTH
;
592 ctx
->Const
.LineWidthGranularity
= (GLfloat
) LINE_WIDTH_GRANULARITY
;
593 ctx
->Const
.MaxClipPlanes
= 6;
594 ctx
->Const
.MaxLights
= MAX_LIGHTS
;
595 ctx
->Const
.MaxShininess
= 128.0;
596 ctx
->Const
.MaxSpotExponent
= 128.0;
597 ctx
->Const
.MaxViewportWidth
= MAX_VIEWPORT_WIDTH
;
598 ctx
->Const
.MaxViewportHeight
= MAX_VIEWPORT_HEIGHT
;
599 ctx
->Const
.MinMapBufferAlignment
= 64;
601 /* Driver must override these values if ARB_viewport_array is supported. */
602 ctx
->Const
.MaxViewports
= 1;
603 ctx
->Const
.ViewportSubpixelBits
= 0;
604 ctx
->Const
.ViewportBounds
.Min
= 0;
605 ctx
->Const
.ViewportBounds
.Max
= 0;
607 /** GL_ARB_uniform_buffer_object */
608 ctx
->Const
.MaxCombinedUniformBlocks
= 36;
609 ctx
->Const
.MaxUniformBufferBindings
= 36;
610 ctx
->Const
.MaxUniformBlockSize
= 16384;
611 ctx
->Const
.UniformBufferOffsetAlignment
= 1;
613 for (i
= 0; i
< MESA_SHADER_STAGES
; i
++)
614 init_program_limits(ctx
, i
, &ctx
->Const
.Program
[i
]);
616 ctx
->Const
.MaxProgramMatrices
= MAX_PROGRAM_MATRICES
;
617 ctx
->Const
.MaxProgramMatrixStackDepth
= MAX_PROGRAM_MATRIX_STACK_DEPTH
;
619 /* CheckArrayBounds is overriden by drivers/x11 for X server */
620 ctx
->Const
.CheckArrayBounds
= GL_FALSE
;
622 /* GL_ARB_draw_buffers */
623 ctx
->Const
.MaxDrawBuffers
= MAX_DRAW_BUFFERS
;
625 ctx
->Const
.MaxColorAttachments
= MAX_COLOR_ATTACHMENTS
;
626 ctx
->Const
.MaxRenderbufferSize
= MAX_RENDERBUFFER_SIZE
;
628 ctx
->Const
.Program
[MESA_SHADER_VERTEX
].MaxTextureImageUnits
= MAX_TEXTURE_IMAGE_UNITS
;
629 ctx
->Const
.MaxCombinedTextureImageUnits
= MAX_COMBINED_TEXTURE_IMAGE_UNITS
;
630 ctx
->Const
.MaxVarying
= 16; /* old limit not to break tnl and swrast */
631 ctx
->Const
.Program
[MESA_SHADER_GEOMETRY
].MaxTextureImageUnits
= MAX_TEXTURE_IMAGE_UNITS
;
632 ctx
->Const
.MaxGeometryOutputVertices
= MAX_GEOMETRY_OUTPUT_VERTICES
;
633 ctx
->Const
.MaxGeometryTotalOutputComponents
= MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS
;
635 /* Shading language version */
636 if (_mesa_is_desktop_gl(ctx
)) {
637 ctx
->Const
.GLSLVersion
= 120;
638 _mesa_override_glsl_version(ctx
);
640 else if (ctx
->API
== API_OPENGLES2
) {
641 ctx
->Const
.GLSLVersion
= 100;
643 else if (ctx
->API
== API_OPENGLES
) {
644 ctx
->Const
.GLSLVersion
= 0; /* GLSL not supported */
647 /* GL_ARB_framebuffer_object */
648 ctx
->Const
.MaxSamples
= 0;
651 ctx
->Const
.MaxServerWaitTimeout
= 0x1fff7fffffffULL
;
653 /* GL_ATI_envmap_bumpmap */
654 ctx
->Const
.SupportedBumpUnits
= SUPPORTED_ATI_BUMP_UNITS
;
656 /* GL_EXT_provoking_vertex */
657 ctx
->Const
.QuadsFollowProvokingVertexConvention
= GL_TRUE
;
659 /* GL_EXT_transform_feedback */
660 ctx
->Const
.MaxTransformFeedbackBuffers
= MAX_FEEDBACK_BUFFERS
;
661 ctx
->Const
.MaxTransformFeedbackSeparateComponents
= 4 * MAX_FEEDBACK_ATTRIBS
;
662 ctx
->Const
.MaxTransformFeedbackInterleavedComponents
= 4 * MAX_FEEDBACK_ATTRIBS
;
663 ctx
->Const
.MaxVertexStreams
= 1;
666 ctx
->Const
.ProfileMask
= ctx
->API
== API_OPENGL_CORE
667 ? GL_CONTEXT_CORE_PROFILE_BIT
668 : GL_CONTEXT_COMPATIBILITY_PROFILE_BIT
;
670 /** GL_EXT_gpu_shader4 */
671 ctx
->Const
.MinProgramTexelOffset
= -8;
672 ctx
->Const
.MaxProgramTexelOffset
= 7;
674 /* GL_ARB_texture_gather */
675 ctx
->Const
.MinProgramTextureGatherOffset
= -8;
676 ctx
->Const
.MaxProgramTextureGatherOffset
= 7;
678 /* GL_ARB_robustness */
679 ctx
->Const
.ResetStrategy
= GL_NO_RESET_NOTIFICATION_ARB
;
681 /* PrimitiveRestart */
682 ctx
->Const
.PrimitiveRestartInSoftware
= GL_FALSE
;
684 /* ES 3.0 or ARB_ES3_compatibility */
685 ctx
->Const
.MaxElementIndex
= 0xffffffffu
;
687 /* GL_ARB_texture_multisample */
688 ctx
->Const
.MaxColorTextureSamples
= 1;
689 ctx
->Const
.MaxDepthTextureSamples
= 1;
690 ctx
->Const
.MaxIntegerSamples
= 1;
692 /* GL_ARB_shader_atomic_counters */
693 ctx
->Const
.MaxAtomicBufferBindings
= MAX_COMBINED_ATOMIC_BUFFERS
;
694 ctx
->Const
.MaxAtomicBufferSize
= MAX_ATOMIC_COUNTERS
* ATOMIC_COUNTER_SIZE
;
695 ctx
->Const
.MaxCombinedAtomicBuffers
= MAX_COMBINED_ATOMIC_BUFFERS
;
696 ctx
->Const
.MaxCombinedAtomicCounters
= MAX_ATOMIC_COUNTERS
;
698 /* GL_ARB_vertex_attrib_binding */
699 ctx
->Const
.MaxVertexAttribRelativeOffset
= 2047;
700 ctx
->Const
.MaxVertexAttribBindings
= MAX_VERTEX_GENERIC_ATTRIBS
;
702 /* GL_ARB_compute_shader */
703 ctx
->Const
.MaxComputeWorkGroupCount
[0] = 65535;
704 ctx
->Const
.MaxComputeWorkGroupCount
[1] = 65535;
705 ctx
->Const
.MaxComputeWorkGroupCount
[2] = 65535;
706 ctx
->Const
.MaxComputeWorkGroupSize
[0] = 1024;
707 ctx
->Const
.MaxComputeWorkGroupSize
[1] = 1024;
708 ctx
->Const
.MaxComputeWorkGroupSize
[2] = 64;
709 ctx
->Const
.MaxComputeWorkGroupInvocations
= 1024;
711 /** GL_ARB_gpu_shader5 */
712 ctx
->Const
.MinFragmentInterpolationOffset
= MIN_FRAGMENT_INTERPOLATION_OFFSET
;
713 ctx
->Const
.MaxFragmentInterpolationOffset
= MAX_FRAGMENT_INTERPOLATION_OFFSET
;
718 * Do some sanity checks on the limits/constants for the given context.
719 * Only called the first time a context is bound.
722 check_context_limits(struct gl_context
*ctx
)
724 /* check that we don't exceed the size of various bitfields */
725 assert(VARYING_SLOT_MAX
<=
726 (8 * sizeof(ctx
->VertexProgram
._Current
->Base
.OutputsWritten
)));
727 assert(VARYING_SLOT_MAX
<=
728 (8 * sizeof(ctx
->FragmentProgram
._Current
->Base
.InputsRead
)));
730 /* shader-related checks */
731 assert(ctx
->Const
.Program
[MESA_SHADER_FRAGMENT
].MaxLocalParams
<= MAX_PROGRAM_LOCAL_PARAMS
);
732 assert(ctx
->Const
.Program
[MESA_SHADER_VERTEX
].MaxLocalParams
<= MAX_PROGRAM_LOCAL_PARAMS
);
734 /* Texture unit checks */
735 assert(ctx
->Const
.Program
[MESA_SHADER_FRAGMENT
].MaxTextureImageUnits
> 0);
736 assert(ctx
->Const
.Program
[MESA_SHADER_FRAGMENT
].MaxTextureImageUnits
<= MAX_TEXTURE_IMAGE_UNITS
);
737 assert(ctx
->Const
.MaxTextureCoordUnits
> 0);
738 assert(ctx
->Const
.MaxTextureCoordUnits
<= MAX_TEXTURE_COORD_UNITS
);
739 assert(ctx
->Const
.MaxTextureUnits
> 0);
740 assert(ctx
->Const
.MaxTextureUnits
<= MAX_TEXTURE_IMAGE_UNITS
);
741 assert(ctx
->Const
.MaxTextureUnits
<= MAX_TEXTURE_COORD_UNITS
);
742 assert(ctx
->Const
.MaxTextureUnits
== MIN2(ctx
->Const
.Program
[MESA_SHADER_FRAGMENT
].MaxTextureImageUnits
,
743 ctx
->Const
.MaxTextureCoordUnits
));
744 assert(ctx
->Const
.MaxCombinedTextureImageUnits
> 0);
745 assert(ctx
->Const
.MaxCombinedTextureImageUnits
<= MAX_COMBINED_TEXTURE_IMAGE_UNITS
);
746 assert(ctx
->Const
.MaxTextureCoordUnits
<= MAX_COMBINED_TEXTURE_IMAGE_UNITS
);
747 /* number of coord units cannot be greater than number of image units */
748 assert(ctx
->Const
.MaxTextureCoordUnits
<= ctx
->Const
.Program
[MESA_SHADER_FRAGMENT
].MaxTextureImageUnits
);
751 /* Texture size checks */
752 assert(ctx
->Const
.MaxTextureLevels
<= MAX_TEXTURE_LEVELS
);
753 assert(ctx
->Const
.Max3DTextureLevels
<= MAX_3D_TEXTURE_LEVELS
);
754 assert(ctx
->Const
.MaxCubeTextureLevels
<= MAX_CUBE_TEXTURE_LEVELS
);
755 assert(ctx
->Const
.MaxTextureRectSize
<= MAX_TEXTURE_RECT_SIZE
);
757 /* Texture level checks */
758 assert(MAX_TEXTURE_LEVELS
>= MAX_3D_TEXTURE_LEVELS
);
759 assert(MAX_TEXTURE_LEVELS
>= MAX_CUBE_TEXTURE_LEVELS
);
761 /* Max texture size should be <= max viewport size (render to texture) */
762 assert((1U << (ctx
->Const
.MaxTextureLevels
- 1))
763 <= ctx
->Const
.MaxViewportWidth
);
764 assert((1U << (ctx
->Const
.MaxTextureLevels
- 1))
765 <= ctx
->Const
.MaxViewportHeight
);
767 assert(ctx
->Const
.MaxDrawBuffers
<= MAX_DRAW_BUFFERS
);
769 /* if this fails, add more enum values to gl_buffer_index */
770 assert(BUFFER_COLOR0
+ MAX_DRAW_BUFFERS
<= BUFFER_COUNT
);
772 /* XXX probably add more tests */
777 * Initialize the attribute groups in a GL context.
779 * \param ctx GL context.
781 * Initializes all the attributes, calling the respective <tt>init*</tt>
782 * functions for the more complex data structures.
785 init_attrib_groups(struct gl_context
*ctx
)
790 _mesa_init_constants( ctx
);
793 _mesa_init_extensions( ctx
);
795 /* Attribute Groups */
796 _mesa_init_accum( ctx
);
797 _mesa_init_attrib( ctx
);
798 _mesa_init_buffer_objects( ctx
);
799 _mesa_init_color( ctx
);
800 _mesa_init_current( ctx
);
801 _mesa_init_depth( ctx
);
802 _mesa_init_debug( ctx
);
803 _mesa_init_display_list( ctx
);
804 _mesa_init_errors( ctx
);
805 _mesa_init_eval( ctx
);
806 _mesa_init_fbobjects( ctx
);
807 _mesa_init_feedback( ctx
);
808 _mesa_init_fog( ctx
);
809 _mesa_init_hint( ctx
);
810 _mesa_init_line( ctx
);
811 _mesa_init_lighting( ctx
);
812 _mesa_init_matrix( ctx
);
813 _mesa_init_multisample( ctx
);
814 _mesa_init_performance_monitors( ctx
);
815 _mesa_init_pipeline( ctx
);
816 _mesa_init_pixel( ctx
);
817 _mesa_init_pixelstore( ctx
);
818 _mesa_init_point( ctx
);
819 _mesa_init_polygon( ctx
);
820 _mesa_init_program( ctx
);
821 _mesa_init_queryobj( ctx
);
822 _mesa_init_sync( ctx
);
823 _mesa_init_rastpos( ctx
);
824 _mesa_init_scissor( ctx
);
825 _mesa_init_shader_state( ctx
);
826 _mesa_init_stencil( ctx
);
827 _mesa_init_transform( ctx
);
828 _mesa_init_transform_feedback( ctx
);
829 _mesa_init_varray( ctx
);
830 _mesa_init_viewport( ctx
);
832 if (!_mesa_init_texture( ctx
))
835 _mesa_init_texture_s3tc( ctx
);
838 ctx
->NewState
= _NEW_ALL
;
839 ctx
->NewDriverState
= ~0;
840 ctx
->ErrorValue
= GL_NO_ERROR
;
841 ctx
->ShareGroupReset
= false;
842 ctx
->varying_vp_inputs
= VERT_BIT_ALL
;
849 * Update default objects in a GL context with respect to shared state.
851 * \param ctx GL context.
853 * Removes references to old default objects, (texture objects, program
854 * objects, etc.) and changes to reference those from the current shared
858 update_default_objects(struct gl_context
*ctx
)
862 _mesa_update_default_objects_program(ctx
);
863 _mesa_update_default_objects_texture(ctx
);
864 _mesa_update_default_objects_buffer_objects(ctx
);
871 * This is the default function we plug into all dispatch table slots
872 * This helps prevents a segfault when someone calls a GL function without
873 * first checking if the extension's supported.
876 _mesa_generic_nop(void)
878 GET_CURRENT_CONTEXT(ctx
);
879 _mesa_error(ctx
, GL_INVALID_OPERATION
,
880 "unsupported function called "
881 "(unsupported extension or deprecated function?)");
887 * Allocate and initialize a new dispatch table.
889 struct _glapi_table
*
890 _mesa_alloc_dispatch_table()
892 /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
893 * In practice, this'll be the same for stand-alone Mesa. But for DRI
894 * Mesa we do this to accomodate different versions of libGL and various
897 GLint numEntries
= MAX2(_glapi_get_dispatch_table_size(), _gloffset_COUNT
);
898 struct _glapi_table
*table
;
900 table
= malloc(numEntries
* sizeof(_glapi_proc
));
902 _glapi_proc
*entry
= (_glapi_proc
*) table
;
904 for (i
= 0; i
< numEntries
; i
++) {
905 entry
[i
] = (_glapi_proc
) _mesa_generic_nop
;
912 * Creates a minimal dispatch table for use within glBegin()/glEnd().
914 * This ensures that we generate GL_INVALID_OPERATION errors from most
915 * functions, since the set of functions that are valid within Begin/End is
918 * From the GL 1.0 specification section 2.6.3, "GL Commands within
921 * "The only GL commands that are allowed within any Begin/End pairs are
922 * the commands for specifying vertex coordinates, vertex color, normal
923 * coordinates, and texture coordinates (Vertex, Color, Index, Normal,
924 * TexCoord), EvalCoord and EvalPoint commands (see section 5.1),
925 * commands for specifying lighting material parameters (Material
926 * commands see section 2.12.2), display list invocation commands
927 * (CallList and CallLists see section 5.4), and the EdgeFlag
928 * command. Executing Begin after Begin has already been executed but
929 * before an End is issued generates the INVALID OPERATION error, as does
930 * executing End without a previous corresponding Begin. Executing any
931 * other GL command within Begin/End results in the error INVALID
934 * The table entries for specifying vertex attributes are set up by
935 * install_vtxfmt() and _mesa_loopback_init_api_table(), and End() and dlists
936 * are set by install_vtxfmt() as well.
938 static struct _glapi_table
*
939 create_beginend_table(const struct gl_context
*ctx
)
941 struct _glapi_table
*table
;
943 table
= _mesa_alloc_dispatch_table();
947 /* Fill in functions which return a value, since they should return some
948 * specific value even if they emit a GL_INVALID_OPERATION error from them
949 * being called within glBegin()/glEnd().
951 #define COPY_DISPATCH(func) SET_##func(table, GET_##func(ctx->Exec))
953 COPY_DISPATCH(GenLists
);
954 COPY_DISPATCH(IsProgram
);
955 COPY_DISPATCH(IsVertexArray
);
956 COPY_DISPATCH(IsBuffer
);
957 COPY_DISPATCH(IsEnabled
);
958 COPY_DISPATCH(IsEnabledi
);
959 COPY_DISPATCH(IsRenderbuffer
);
960 COPY_DISPATCH(IsFramebuffer
);
961 COPY_DISPATCH(CheckFramebufferStatus
);
962 COPY_DISPATCH(RenderMode
);
963 COPY_DISPATCH(GetString
);
964 COPY_DISPATCH(GetStringi
);
965 COPY_DISPATCH(GetPointerv
);
966 COPY_DISPATCH(IsQuery
);
967 COPY_DISPATCH(IsSampler
);
968 COPY_DISPATCH(IsSync
);
969 COPY_DISPATCH(IsTexture
);
970 COPY_DISPATCH(IsTransformFeedback
);
971 COPY_DISPATCH(DeleteQueries
);
972 COPY_DISPATCH(AreTexturesResident
);
973 COPY_DISPATCH(FenceSync
);
974 COPY_DISPATCH(ClientWaitSync
);
975 COPY_DISPATCH(MapBuffer
);
976 COPY_DISPATCH(UnmapBuffer
);
977 COPY_DISPATCH(MapBufferRange
);
978 COPY_DISPATCH(ObjectPurgeableAPPLE
);
979 COPY_DISPATCH(ObjectUnpurgeableAPPLE
);
981 _mesa_loopback_init_api_table(ctx
, table
);
987 _mesa_initialize_dispatch_tables(struct gl_context
*ctx
)
989 /* Do the code-generated setup of the exec table in api_exec.c. */
990 _mesa_initialize_exec_table(ctx
);
993 _mesa_initialize_save_table(ctx
);
997 * Initialize a struct gl_context struct (rendering context).
999 * This includes allocating all the other structs and arrays which hang off of
1000 * the context by pointers.
1001 * Note that the driver needs to pass in its dd_function_table here since
1002 * we need to at least call driverFunctions->NewTextureObject to create the
1003 * default texture objects.
1005 * Called by _mesa_create_context().
1007 * Performs the imports and exports callback tables initialization, and
1008 * miscellaneous one-time initializations. If no shared context is supplied one
1009 * is allocated, and increase its reference count. Setups the GL API dispatch
1010 * tables. Initialize the TNL module. Sets the maximum Z buffer depth.
1011 * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
1014 * \param ctx the context to initialize
1015 * \param api the GL API type to create the context for
1016 * \param visual describes the visual attributes for this context or NULL to
1017 * create a configless context
1018 * \param share_list points to context to share textures, display lists,
1020 * \param driverFunctions table of device driver functions for this context
1024 _mesa_initialize_context(struct gl_context
*ctx
,
1026 const struct gl_config
*visual
,
1027 struct gl_context
*share_list
,
1028 const struct dd_function_table
*driverFunctions
)
1030 struct gl_shared_state
*shared
;
1033 assert(driverFunctions
->NewTextureObject
);
1034 assert(driverFunctions
->FreeTextureImageBuffer
);
1037 ctx
->DrawBuffer
= NULL
;
1038 ctx
->ReadBuffer
= NULL
;
1039 ctx
->WinSysDrawBuffer
= NULL
;
1040 ctx
->WinSysReadBuffer
= NULL
;
1043 ctx
->Visual
= *visual
;
1044 ctx
->HasConfig
= GL_TRUE
;
1047 memset(&ctx
->Visual
, 0, sizeof ctx
->Visual
);
1048 ctx
->HasConfig
= GL_FALSE
;
1051 if (_mesa_is_desktop_gl(ctx
)) {
1052 _mesa_override_gl_version(ctx
);
1055 /* misc one-time initializations */
1058 /* Plug in driver functions and context pointer here.
1059 * This is important because when we call alloc_shared_state() below
1060 * we'll call ctx->Driver.NewTextureObject() to create the default
1063 ctx
->Driver
= *driverFunctions
;
1066 /* share state with another context */
1067 shared
= share_list
->Shared
;
1070 /* allocate new, unshared state */
1071 shared
= _mesa_alloc_shared_state(ctx
);
1076 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, shared
);
1078 if (!init_attrib_groups( ctx
))
1081 /* setup the API dispatch tables with all nop functions */
1082 ctx
->OutsideBeginEnd
= _mesa_alloc_dispatch_table();
1083 if (!ctx
->OutsideBeginEnd
)
1085 ctx
->Exec
= ctx
->OutsideBeginEnd
;
1086 ctx
->CurrentDispatch
= ctx
->OutsideBeginEnd
;
1088 ctx
->FragmentProgram
._MaintainTexEnvProgram
1089 = (_mesa_getenv("MESA_TEX_PROG") != NULL
);
1091 ctx
->VertexProgram
._MaintainTnlProgram
1092 = (_mesa_getenv("MESA_TNL_PROG") != NULL
);
1093 if (ctx
->VertexProgram
._MaintainTnlProgram
) {
1094 /* this is required... */
1095 ctx
->FragmentProgram
._MaintainTexEnvProgram
= GL_TRUE
;
1098 /* Mesa core handles all the formats that mesa core knows about.
1099 * Drivers will want to override this list with just the formats
1100 * they can handle, and confirm that appropriate fallbacks exist in
1101 * _mesa_choose_tex_format().
1103 memset(&ctx
->TextureFormatSupported
, GL_TRUE
,
1104 sizeof(ctx
->TextureFormatSupported
));
1107 case API_OPENGL_COMPAT
:
1108 ctx
->BeginEnd
= create_beginend_table(ctx
);
1109 ctx
->Save
= _mesa_alloc_dispatch_table();
1110 if (!ctx
->BeginEnd
|| !ctx
->Save
)
1114 case API_OPENGL_CORE
:
1118 * GL_OES_texture_cube_map says
1119 * "Initially all texture generation modes are set to REFLECTION_MAP_OES"
1121 for (i
= 0; i
< MAX_TEXTURE_UNITS
; i
++) {
1122 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[i
];
1123 texUnit
->GenS
.Mode
= GL_REFLECTION_MAP_NV
;
1124 texUnit
->GenT
.Mode
= GL_REFLECTION_MAP_NV
;
1125 texUnit
->GenR
.Mode
= GL_REFLECTION_MAP_NV
;
1126 texUnit
->GenS
._ModeBit
= TEXGEN_REFLECTION_MAP_NV
;
1127 texUnit
->GenT
._ModeBit
= TEXGEN_REFLECTION_MAP_NV
;
1128 texUnit
->GenR
._ModeBit
= TEXGEN_REFLECTION_MAP_NV
;
1132 ctx
->FragmentProgram
._MaintainTexEnvProgram
= GL_TRUE
;
1133 ctx
->VertexProgram
._MaintainTnlProgram
= GL_TRUE
;
1137 ctx
->FirstTimeCurrent
= GL_TRUE
;
1142 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, NULL
);
1143 free(ctx
->BeginEnd
);
1144 free(ctx
->OutsideBeginEnd
);
1151 * Allocate and initialize a struct gl_context structure.
1152 * Note that the driver needs to pass in its dd_function_table here since
1153 * we need to at least call driverFunctions->NewTextureObject to initialize
1154 * the rendering context.
1156 * \param api the GL API type to create the context for
1157 * \param visual a struct gl_config pointer (we copy the struct contents) or
1158 * NULL to create a configless context
1159 * \param share_list another context to share display lists with or NULL
1160 * \param driverFunctions points to the dd_function_table into which the
1161 * driver has plugged in all its special functions.
1163 * \return pointer to a new __struct gl_contextRec or NULL if error.
1166 _mesa_create_context(gl_api api
,
1167 const struct gl_config
*visual
,
1168 struct gl_context
*share_list
,
1169 const struct dd_function_table
*driverFunctions
)
1171 struct gl_context
*ctx
;
1173 ctx
= calloc(1, sizeof(struct gl_context
));
1177 if (_mesa_initialize_context(ctx
, api
, visual
, share_list
,
1189 * Free the data associated with the given context.
1191 * But doesn't free the struct gl_context struct itself.
1193 * \sa _mesa_initialize_context() and init_attrib_groups().
1196 _mesa_free_context_data( struct gl_context
*ctx
)
1198 if (!_mesa_get_current_context()){
1199 /* No current context, but we may need one in order to delete
1200 * texture objs, etc. So temporarily bind the context now.
1202 _mesa_make_current(ctx
, NULL
, NULL
);
1205 /* unreference WinSysDraw/Read buffers */
1206 _mesa_reference_framebuffer(&ctx
->WinSysDrawBuffer
, NULL
);
1207 _mesa_reference_framebuffer(&ctx
->WinSysReadBuffer
, NULL
);
1208 _mesa_reference_framebuffer(&ctx
->DrawBuffer
, NULL
);
1209 _mesa_reference_framebuffer(&ctx
->ReadBuffer
, NULL
);
1211 _mesa_reference_vertprog(ctx
, &ctx
->VertexProgram
.Current
, NULL
);
1212 _mesa_reference_vertprog(ctx
, &ctx
->VertexProgram
._Current
, NULL
);
1213 _mesa_reference_vertprog(ctx
, &ctx
->VertexProgram
._TnlProgram
, NULL
);
1215 _mesa_reference_fragprog(ctx
, &ctx
->FragmentProgram
.Current
, NULL
);
1216 _mesa_reference_fragprog(ctx
, &ctx
->FragmentProgram
._Current
, NULL
);
1217 _mesa_reference_fragprog(ctx
, &ctx
->FragmentProgram
._TexEnvProgram
, NULL
);
1219 _mesa_reference_vao(ctx
, &ctx
->Array
.VAO
, NULL
);
1220 _mesa_reference_vao(ctx
, &ctx
->Array
.DefaultVAO
, NULL
);
1222 _mesa_free_attrib_data(ctx
);
1223 _mesa_free_buffer_objects(ctx
);
1224 _mesa_free_lighting_data( ctx
);
1225 _mesa_free_eval_data( ctx
);
1226 _mesa_free_texture_data( ctx
);
1227 _mesa_free_matrix_data( ctx
);
1228 _mesa_free_viewport_data( ctx
);
1229 _mesa_free_pipeline_data(ctx
);
1230 _mesa_free_program_data(ctx
);
1231 _mesa_free_shader_state(ctx
);
1232 _mesa_free_queryobj_data(ctx
);
1233 _mesa_free_sync_data(ctx
);
1234 _mesa_free_varray_data(ctx
);
1235 _mesa_free_transform_feedback(ctx
);
1236 _mesa_free_performance_monitors(ctx
);
1238 _mesa_reference_buffer_object(ctx
, &ctx
->Pack
.BufferObj
, NULL
);
1239 _mesa_reference_buffer_object(ctx
, &ctx
->Unpack
.BufferObj
, NULL
);
1240 _mesa_reference_buffer_object(ctx
, &ctx
->DefaultPacking
.BufferObj
, NULL
);
1241 _mesa_reference_buffer_object(ctx
, &ctx
->Array
.ArrayBufferObj
, NULL
);
1243 /* free dispatch tables */
1244 free(ctx
->BeginEnd
);
1245 free(ctx
->OutsideBeginEnd
);
1248 /* Shared context state (display lists, textures, etc) */
1249 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, NULL
);
1251 /* needs to be after freeing shared state */
1252 _mesa_free_display_list_data(ctx
);
1254 _mesa_free_errors_data(ctx
);
1256 free((void *)ctx
->Extensions
.String
);
1258 free(ctx
->VersionString
);
1260 /* unbind the context if it's currently bound */
1261 if (ctx
== _mesa_get_current_context()) {
1262 _mesa_make_current(NULL
, NULL
, NULL
);
1268 * Destroy a struct gl_context structure.
1270 * \param ctx GL context.
1272 * Calls _mesa_free_context_data() and frees the gl_context object itself.
1275 _mesa_destroy_context( struct gl_context
*ctx
)
1278 _mesa_free_context_data(ctx
);
1279 free( (void *) ctx
);
1285 * Copy attribute groups from one context to another.
1287 * \param src source context
1288 * \param dst destination context
1289 * \param mask bitwise OR of GL_*_BIT flags
1291 * According to the bits specified in \p mask, copies the corresponding
1292 * attributes from \p src into \p dst. For many of the attributes a simple \c
1293 * memcpy is not enough due to the existence of internal pointers in their data
1297 _mesa_copy_context( const struct gl_context
*src
, struct gl_context
*dst
,
1300 if (mask
& GL_ACCUM_BUFFER_BIT
) {
1302 dst
->Accum
= src
->Accum
;
1304 if (mask
& GL_COLOR_BUFFER_BIT
) {
1306 dst
->Color
= src
->Color
;
1308 if (mask
& GL_CURRENT_BIT
) {
1310 dst
->Current
= src
->Current
;
1312 if (mask
& GL_DEPTH_BUFFER_BIT
) {
1314 dst
->Depth
= src
->Depth
;
1316 if (mask
& GL_ENABLE_BIT
) {
1319 if (mask
& GL_EVAL_BIT
) {
1321 dst
->Eval
= src
->Eval
;
1323 if (mask
& GL_FOG_BIT
) {
1325 dst
->Fog
= src
->Fog
;
1327 if (mask
& GL_HINT_BIT
) {
1329 dst
->Hint
= src
->Hint
;
1331 if (mask
& GL_LIGHTING_BIT
) {
1333 /* begin with memcpy */
1334 dst
->Light
= src
->Light
;
1335 /* fixup linked lists to prevent pointer insanity */
1336 make_empty_list( &(dst
->Light
.EnabledList
) );
1337 for (i
= 0; i
< MAX_LIGHTS
; i
++) {
1338 if (dst
->Light
.Light
[i
].Enabled
) {
1339 insert_at_tail(&(dst
->Light
.EnabledList
), &(dst
->Light
.Light
[i
]));
1343 if (mask
& GL_LINE_BIT
) {
1345 dst
->Line
= src
->Line
;
1347 if (mask
& GL_LIST_BIT
) {
1349 dst
->List
= src
->List
;
1351 if (mask
& GL_PIXEL_MODE_BIT
) {
1353 dst
->Pixel
= src
->Pixel
;
1355 if (mask
& GL_POINT_BIT
) {
1357 dst
->Point
= src
->Point
;
1359 if (mask
& GL_POLYGON_BIT
) {
1361 dst
->Polygon
= src
->Polygon
;
1363 if (mask
& GL_POLYGON_STIPPLE_BIT
) {
1364 /* Use loop instead of memcpy due to problem with Portland Group's
1365 * C compiler. Reported by John Stone.
1368 for (i
= 0; i
< 32; i
++) {
1369 dst
->PolygonStipple
[i
] = src
->PolygonStipple
[i
];
1372 if (mask
& GL_SCISSOR_BIT
) {
1374 dst
->Scissor
= src
->Scissor
;
1376 if (mask
& GL_STENCIL_BUFFER_BIT
) {
1378 dst
->Stencil
= src
->Stencil
;
1380 if (mask
& GL_TEXTURE_BIT
) {
1381 /* Cannot memcpy because of pointers */
1382 _mesa_copy_texture_state(src
, dst
);
1384 if (mask
& GL_TRANSFORM_BIT
) {
1386 dst
->Transform
= src
->Transform
;
1388 if (mask
& GL_VIEWPORT_BIT
) {
1389 /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
1391 for (i
= 0; i
< src
->Const
.MaxViewports
; i
++) {
1392 dst
->ViewportArray
[i
].X
= src
->ViewportArray
[i
].X
;
1393 dst
->ViewportArray
[i
].Y
= src
->ViewportArray
[i
].Y
;
1394 dst
->ViewportArray
[i
].Width
= src
->ViewportArray
[i
].Width
;
1395 dst
->ViewportArray
[i
].Height
= src
->ViewportArray
[i
].Height
;
1396 dst
->ViewportArray
[i
].Near
= src
->ViewportArray
[i
].Near
;
1397 dst
->ViewportArray
[i
].Far
= src
->ViewportArray
[i
].Far
;
1398 _math_matrix_copy(&dst
->ViewportArray
[i
]._WindowMap
,
1399 &src
->ViewportArray
[i
]._WindowMap
);
1403 /* XXX FIXME: Call callbacks?
1405 dst
->NewState
= _NEW_ALL
;
1406 dst
->NewDriverState
= ~0;
1411 * Check if the given context can render into the given framebuffer
1412 * by checking visual attributes.
1414 * Most of these tests could go away because Mesa is now pretty flexible
1415 * in terms of mixing rendering contexts with framebuffers. As long
1416 * as RGB vs. CI mode agree, we're probably good.
1418 * \return GL_TRUE if compatible, GL_FALSE otherwise.
1421 check_compatible(const struct gl_context
*ctx
,
1422 const struct gl_framebuffer
*buffer
)
1424 const struct gl_config
*ctxvis
= &ctx
->Visual
;
1425 const struct gl_config
*bufvis
= &buffer
->Visual
;
1427 if (buffer
== _mesa_get_incomplete_framebuffer())
1431 /* disabling this fixes the fgl_glxgears pbuffer demo */
1432 if (ctxvis
->doubleBufferMode
&& !bufvis
->doubleBufferMode
)
1435 if (ctxvis
->stereoMode
&& !bufvis
->stereoMode
)
1437 if (ctxvis
->haveAccumBuffer
&& !bufvis
->haveAccumBuffer
)
1439 if (ctxvis
->haveDepthBuffer
&& !bufvis
->haveDepthBuffer
)
1441 if (ctxvis
->haveStencilBuffer
&& !bufvis
->haveStencilBuffer
)
1443 if (ctxvis
->redMask
&& ctxvis
->redMask
!= bufvis
->redMask
)
1445 if (ctxvis
->greenMask
&& ctxvis
->greenMask
!= bufvis
->greenMask
)
1447 if (ctxvis
->blueMask
&& ctxvis
->blueMask
!= bufvis
->blueMask
)
1450 /* disabled (see bug 11161) */
1451 if (ctxvis
->depthBits
&& ctxvis
->depthBits
!= bufvis
->depthBits
)
1454 if (ctxvis
->stencilBits
&& ctxvis
->stencilBits
!= bufvis
->stencilBits
)
1462 * Check if the viewport/scissor size has not yet been initialized.
1463 * Initialize the size if the given width and height are non-zero.
1466 _mesa_check_init_viewport(struct gl_context
*ctx
, GLuint width
, GLuint height
)
1468 if (!ctx
->ViewportInitialized
&& width
> 0 && height
> 0) {
1471 /* Note: set flag here, before calling _mesa_set_viewport(), to prevent
1472 * potential infinite recursion.
1474 ctx
->ViewportInitialized
= GL_TRUE
;
1476 /* Note: ctx->Const.MaxViewports may not have been set by the driver
1477 * yet, so just initialize all of them.
1479 for (i
= 0; i
< MAX_VIEWPORTS
; i
++) {
1480 _mesa_set_viewport(ctx
, i
, 0, 0, width
, height
);
1481 _mesa_set_scissor(ctx
, i
, 0, 0, width
, height
);
1487 handle_first_current(struct gl_context
*ctx
)
1492 assert(ctx
->Version
> 0);
1494 ctx
->Extensions
.String
= _mesa_make_extension_string(ctx
);
1496 check_context_limits(ctx
);
1498 /* According to GL_MESA_configless_context the default value of
1499 * glDrawBuffers depends on the config of the first surface it is bound to.
1500 * For GLES it is always GL_BACK which has a magic interpretation */
1501 if (!ctx
->HasConfig
&& _mesa_is_desktop_gl(ctx
)) {
1502 if (ctx
->DrawBuffer
!= _mesa_get_incomplete_framebuffer()) {
1503 if (ctx
->DrawBuffer
->Visual
.doubleBufferMode
)
1508 _mesa_drawbuffers(ctx
, 1, &buffer
, NULL
/* destMask */);
1511 if (ctx
->ReadBuffer
!= _mesa_get_incomplete_framebuffer()) {
1512 if (ctx
->ReadBuffer
->Visual
.doubleBufferMode
) {
1514 bufferIndex
= BUFFER_BACK_LEFT
;
1518 bufferIndex
= BUFFER_FRONT_LEFT
;
1521 _mesa_readbuffer(ctx
, buffer
, bufferIndex
);
1525 /* We can use this to help debug user's problems. Tell them to set
1526 * the MESA_INFO env variable before running their app. Then the
1527 * first time each context is made current we'll print some useful
1530 if (_mesa_getenv("MESA_INFO")) {
1531 _mesa_print_info(ctx
);
1536 * Bind the given context to the given drawBuffer and readBuffer and
1537 * make it the current context for the calling thread.
1538 * We'll render into the drawBuffer and read pixels from the
1539 * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1541 * We check that the context's and framebuffer's visuals are compatible
1542 * and return immediately if they're not.
1544 * \param newCtx the new GL context. If NULL then there will be no current GL
1546 * \param drawBuffer the drawing framebuffer
1547 * \param readBuffer the reading framebuffer
1550 _mesa_make_current( struct gl_context
*newCtx
,
1551 struct gl_framebuffer
*drawBuffer
,
1552 struct gl_framebuffer
*readBuffer
)
1554 GET_CURRENT_CONTEXT(curCtx
);
1556 if (MESA_VERBOSE
& VERBOSE_API
)
1557 _mesa_debug(newCtx
, "_mesa_make_current()\n");
1559 /* Check that the context's and framebuffer's visuals are compatible.
1561 if (newCtx
&& drawBuffer
&& newCtx
->WinSysDrawBuffer
!= drawBuffer
) {
1562 if (!check_compatible(newCtx
, drawBuffer
)) {
1563 _mesa_warning(newCtx
,
1564 "MakeCurrent: incompatible visuals for context and drawbuffer");
1568 if (newCtx
&& readBuffer
&& newCtx
->WinSysReadBuffer
!= readBuffer
) {
1569 if (!check_compatible(newCtx
, readBuffer
)) {
1570 _mesa_warning(newCtx
,
1571 "MakeCurrent: incompatible visuals for context and readbuffer");
1577 (curCtx
->WinSysDrawBuffer
|| curCtx
->WinSysReadBuffer
) &&
1578 /* make sure this context is valid for flushing */
1580 _mesa_flush(curCtx
);
1582 /* We used to call _glapi_check_multithread() here. Now do it in drivers */
1583 _glapi_set_context((void *) newCtx
);
1584 ASSERT(_mesa_get_current_context() == newCtx
);
1587 _glapi_set_dispatch(NULL
); /* none current */
1590 _glapi_set_dispatch(newCtx
->CurrentDispatch
);
1592 if (drawBuffer
&& readBuffer
) {
1593 ASSERT(_mesa_is_winsys_fbo(drawBuffer
));
1594 ASSERT(_mesa_is_winsys_fbo(readBuffer
));
1595 _mesa_reference_framebuffer(&newCtx
->WinSysDrawBuffer
, drawBuffer
);
1596 _mesa_reference_framebuffer(&newCtx
->WinSysReadBuffer
, readBuffer
);
1599 * Only set the context's Draw/ReadBuffer fields if they're NULL
1600 * or not bound to a user-created FBO.
1602 if (!newCtx
->DrawBuffer
|| _mesa_is_winsys_fbo(newCtx
->DrawBuffer
)) {
1603 _mesa_reference_framebuffer(&newCtx
->DrawBuffer
, drawBuffer
);
1604 /* Update the FBO's list of drawbuffers/renderbuffers.
1605 * For winsys FBOs this comes from the GL state (which may have
1606 * changed since the last time this FBO was bound).
1608 _mesa_update_draw_buffers(newCtx
);
1610 if (!newCtx
->ReadBuffer
|| _mesa_is_winsys_fbo(newCtx
->ReadBuffer
)) {
1611 _mesa_reference_framebuffer(&newCtx
->ReadBuffer
, readBuffer
);
1614 /* XXX only set this flag if we're really changing the draw/read
1615 * framebuffer bindings.
1617 newCtx
->NewState
|= _NEW_BUFFERS
;
1620 _mesa_check_init_viewport(newCtx
,
1621 drawBuffer
->Width
, drawBuffer
->Height
);
1625 if (newCtx
->FirstTimeCurrent
) {
1626 handle_first_current(newCtx
);
1627 newCtx
->FirstTimeCurrent
= GL_FALSE
;
1636 * Make context 'ctx' share the display lists, textures and programs
1637 * that are associated with 'ctxToShare'.
1638 * Any display lists, textures or programs associated with 'ctx' will
1639 * be deleted if nobody else is sharing them.
1642 _mesa_share_state(struct gl_context
*ctx
, struct gl_context
*ctxToShare
)
1644 if (ctx
&& ctxToShare
&& ctx
->Shared
&& ctxToShare
->Shared
) {
1645 struct gl_shared_state
*oldShared
= NULL
;
1647 /* save ref to old state to prevent it from being deleted immediately */
1648 _mesa_reference_shared_state(ctx
, &oldShared
, ctx
->Shared
);
1650 /* update ctx's Shared pointer */
1651 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, ctxToShare
->Shared
);
1653 update_default_objects(ctx
);
1655 /* release the old shared state */
1656 _mesa_reference_shared_state(ctx
, &oldShared
, NULL
);
1668 * \return pointer to the current GL context for this thread.
1670 * Calls _glapi_get_context(). This isn't the fastest way to get the current
1671 * context. If you need speed, see the #GET_CURRENT_CONTEXT macro in
1675 _mesa_get_current_context( void )
1677 return (struct gl_context
*) _glapi_get_context();
1682 * Get context's current API dispatch table.
1684 * It'll either be the immediate-mode execute dispatcher or the display list
1685 * compile dispatcher.
1687 * \param ctx GL context.
1689 * \return pointer to dispatch_table.
1691 * Simply returns __struct gl_contextRec::CurrentDispatch.
1693 struct _glapi_table
*
1694 _mesa_get_dispatch(struct gl_context
*ctx
)
1696 return ctx
->CurrentDispatch
;
1702 /**********************************************************************/
1703 /** \name Miscellaneous functions */
1704 /**********************************************************************/
1710 * \param ctx GL context.
1711 * \param error error code.
1713 * Records the given error code and call the driver's dd_function_table::Error
1714 * function if defined.
1717 * This is called via _mesa_error().
1720 _mesa_record_error(struct gl_context
*ctx
, GLenum error
)
1725 if (ctx
->ErrorValue
== GL_NO_ERROR
) {
1726 ctx
->ErrorValue
= error
;
1732 * Flush commands and wait for completion.
1735 _mesa_finish(struct gl_context
*ctx
)
1737 FLUSH_VERTICES( ctx
, 0 );
1738 FLUSH_CURRENT( ctx
, 0 );
1739 if (ctx
->Driver
.Finish
) {
1740 ctx
->Driver
.Finish(ctx
);
1749 _mesa_flush(struct gl_context
*ctx
)
1751 FLUSH_VERTICES( ctx
, 0 );
1752 FLUSH_CURRENT( ctx
, 0 );
1753 if (ctx
->Driver
.Flush
) {
1754 ctx
->Driver
.Flush(ctx
);
1761 * Execute glFinish().
1763 * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1764 * dd_function_table::Finish driver callback, if not NULL.
1769 GET_CURRENT_CONTEXT(ctx
);
1770 ASSERT_OUTSIDE_BEGIN_END(ctx
);
1776 * Execute glFlush().
1778 * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1779 * dd_function_table::Flush driver callback, if not NULL.
1784 GET_CURRENT_CONTEXT(ctx
);
1785 ASSERT_OUTSIDE_BEGIN_END(ctx
);
1791 * ARB_blend_func_extended - ERRORS section
1792 * "The error INVALID_OPERATION is generated by Begin or any procedure that
1793 * implicitly calls Begin if any draw buffer has a blend function requiring the
1794 * second color input (SRC1_COLOR, ONE_MINUS_SRC1_COLOR, SRC1_ALPHA or
1795 * ONE_MINUS_SRC1_ALPHA), and a framebuffer is bound that has more than
1796 * the value of MAX_DUAL_SOURCE_DRAW_BUFFERS-1 active color attachements."
1799 _mesa_check_blend_func_error(struct gl_context
*ctx
)
1802 for (i
= ctx
->Const
.MaxDualSourceDrawBuffers
;
1803 i
< ctx
->DrawBuffer
->_NumColorDrawBuffers
;
1805 if (ctx
->Color
.Blend
[i
]._UsesDualSrc
) {
1806 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1807 "dual source blend on illegal attachment");
1815 shader_linked_or_absent(struct gl_context
*ctx
,
1816 const struct gl_shader_program
*shProg
,
1817 bool *shader_present
, const char *where
)
1820 *shader_present
= true;
1822 if (!shProg
->LinkStatus
) {
1823 _mesa_error(ctx
, GL_INVALID_OPERATION
, "%s(shader not linked)", where
);
1826 #if 0 /* not normally enabled */
1829 if (!_mesa_validate_shader_program(ctx
, shProg
, errMsg
)) {
1830 _mesa_warning(ctx
, "Shader program %u is invalid: %s",
1831 shProg
->Name
, errMsg
);
1841 * Prior to drawing anything with glBegin, glDrawArrays, etc. this function
1842 * is called to see if it's valid to render. This involves checking that
1843 * the current shader is valid and the framebuffer is complete.
1844 * It also check the current pipeline object is valid if any.
1845 * If an error is detected it'll be recorded here.
1846 * \return GL_TRUE if OK to render, GL_FALSE if not
1849 _mesa_valid_to_render(struct gl_context
*ctx
, const char *where
)
1851 bool from_glsl_shader
[MESA_SHADER_COMPUTE
] = { false };
1854 /* This depends on having up to date derived state (shaders) */
1856 _mesa_update_state(ctx
);
1858 for (i
= 0; i
< MESA_SHADER_COMPUTE
; i
++) {
1859 if (!shader_linked_or_absent(ctx
, ctx
->_Shader
->CurrentProgram
[i
],
1860 &from_glsl_shader
[i
], where
))
1864 /* Any shader stages that are not supplied by the GLSL shader and have
1865 * assembly shaders enabled must now be validated.
1867 if (!from_glsl_shader
[MESA_SHADER_VERTEX
]
1868 && ctx
->VertexProgram
.Enabled
&& !ctx
->VertexProgram
._Enabled
) {
1869 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1870 "%s(vertex program not valid)", where
);
1874 /* FINISHME: If GL_NV_geometry_program4 is ever supported, the current
1875 * FINISHME: geometry program should validated here.
1877 (void) from_glsl_shader
[MESA_SHADER_GEOMETRY
];
1879 if (!from_glsl_shader
[MESA_SHADER_FRAGMENT
]) {
1880 if (ctx
->FragmentProgram
.Enabled
&& !ctx
->FragmentProgram
._Enabled
) {
1881 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1882 "%s(fragment program not valid)", where
);
1886 /* If drawing to integer-valued color buffers, there must be an
1887 * active fragment shader (GL_EXT_texture_integer).
1889 if (ctx
->DrawBuffer
&& ctx
->DrawBuffer
->_IntegerColor
) {
1890 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1891 "%s(integer format but no fragment shader)", where
);
1896 /* A pipeline object is bound */
1897 if (ctx
->_Shader
->Name
&& !ctx
->_Shader
->Validated
) {
1898 /* Error message will be printed inside _mesa_validate_program_pipeline.
1900 if (!_mesa_validate_program_pipeline(ctx
, ctx
->_Shader
, GL_TRUE
)) {
1905 if (ctx
->DrawBuffer
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
1906 _mesa_error(ctx
, GL_INVALID_FRAMEBUFFER_OPERATION_EXT
,
1907 "%s(incomplete framebuffer)", where
);
1911 if (_mesa_check_blend_func_error(ctx
) == GL_FALSE
) {
1916 if (ctx
->_Shader
->Flags
& GLSL_LOG
) {
1917 struct gl_shader_program
**shProg
= ctx
->_Shader
->CurrentProgram
;
1920 for (i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
1921 if (shProg
[i
] == NULL
|| shProg
[i
]->_Used
1922 || shProg
[i
]->_LinkedShaders
[i
] == NULL
)
1925 /* This is the first time this shader is being used.
1926 * Append shader's constants/uniforms to log file.
1928 * Only log data for the program target that matches the shader
1929 * target. It's possible to have a program bound to the vertex
1930 * shader target that also supplied a fragment shader. If that
1931 * program isn't also bound to the fragment shader target we don't
1932 * want to log its fragment data.
1934 _mesa_append_uniforms_to_file(shProg
[i
]->_LinkedShaders
[i
]);
1937 for (i
= 0; i
< MESA_SHADER_STAGES
; i
++) {
1938 if (shProg
[i
] != NULL
)
1939 shProg
[i
]->_Used
= GL_TRUE
;