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"
89 #include "bufferobj.h"
90 #include "conservativeraster.h"
94 #include "debug_output.h"
98 #include "extensions.h"
100 #include "feedback.h"
103 #include "framebuffer.h"
104 #include "glthread.h"
111 #include "multisample.h"
112 #include "performance_monitor.h"
113 #include "performance_query.h"
114 #include "pipelineobj.h"
116 #include "pixelstore.h"
119 #include "queryobj.h"
125 #include "shaderobj.h"
126 #include "shaderimage.h"
128 #include "util/debug.h"
129 #include "util/disk_cache.h"
130 #include "util/strtod.h"
132 #include "texcompress_s3tc.h"
133 #include "texstate.h"
134 #include "transformfeedback.h"
138 #include "viewport.h"
139 #include "texturebindless.h"
140 #include "program/program.h"
141 #include "math/m_matrix.h"
142 #include "main/dispatch.h" /* for _gloffset_COUNT */
144 #include "git_sha1.h"
147 #include "sparc/sparc.h"
150 #include "compiler/glsl_types.h"
151 #include "compiler/glsl/glsl_parser_extras.h"
156 int MESA_VERBOSE
= 0;
159 #ifndef MESA_DEBUG_FLAGS
160 int MESA_DEBUG_FLAGS
= 0;
164 /* ubyte -> float conversion */
165 GLfloat _mesa_ubyte_to_float_color_tab
[256];
170 * Swap buffers notification callback.
172 * \param ctx GL context.
174 * Called by window system just before swapping buffers.
175 * We have to finish any pending rendering.
178 _mesa_notifySwapBuffers(struct gl_context
*ctx
)
180 if (MESA_VERBOSE
& VERBOSE_SWAPBUFFERS
)
181 _mesa_debug(ctx
, "SwapBuffers\n");
182 FLUSH_CURRENT( ctx
, 0 );
183 if (ctx
->Driver
.Flush
) {
184 ctx
->Driver
.Flush(ctx
);
189 /**********************************************************************/
190 /** \name GL Visual allocation/destruction */
191 /**********************************************************************/
195 * Allocates a struct gl_config structure and initializes it via
196 * _mesa_initialize_visual().
198 * \param dbFlag double buffering
199 * \param stereoFlag stereo buffer
200 * \param depthBits requested bits per depth buffer value. Any value in [0, 32]
201 * is acceptable but the actual depth type will be GLushort or GLuint as
203 * \param stencilBits requested minimum bits per stencil buffer value
204 * \param accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits number
205 * of bits per color component in accum buffer.
206 * \param indexBits number of bits per pixel if \p rgbFlag is GL_FALSE
207 * \param redBits number of bits per color component in frame buffer for RGB(A)
208 * mode. We always use 8 in core Mesa though.
209 * \param greenBits same as above.
210 * \param blueBits same as above.
211 * \param alphaBits same as above.
212 * \param numSamples not really used.
214 * \return pointer to new struct gl_config or NULL if requested parameters
217 * \note Need to add params for level and numAuxBuffers (at least)
220 _mesa_create_visual( GLboolean dbFlag
,
221 GLboolean stereoFlag
,
229 GLint accumGreenBits
,
231 GLint accumAlphaBits
,
234 struct gl_config
*vis
= CALLOC_STRUCT(gl_config
);
236 if (!_mesa_initialize_visual(vis
, dbFlag
, stereoFlag
,
237 redBits
, greenBits
, blueBits
, alphaBits
,
238 depthBits
, stencilBits
,
239 accumRedBits
, accumGreenBits
,
240 accumBlueBits
, accumAlphaBits
,
251 * Makes some sanity checks and fills in the fields of the struct
252 * gl_config object with the given parameters. If the caller needs to
253 * set additional fields, he should just probably init the whole
254 * gl_config object himself.
256 * \return GL_TRUE on success, or GL_FALSE on failure.
258 * \sa _mesa_create_visual() above for the parameter description.
261 _mesa_initialize_visual( struct gl_config
*vis
,
263 GLboolean stereoFlag
,
271 GLint accumGreenBits
,
273 GLint accumAlphaBits
,
278 if (depthBits
< 0 || depthBits
> 32) {
281 if (stencilBits
< 0 || stencilBits
> 8) {
284 assert(accumRedBits
>= 0);
285 assert(accumGreenBits
>= 0);
286 assert(accumBlueBits
>= 0);
287 assert(accumAlphaBits
>= 0);
289 vis
->rgbMode
= GL_TRUE
;
290 vis
->doubleBufferMode
= dbFlag
;
291 vis
->stereoMode
= stereoFlag
;
293 vis
->redBits
= redBits
;
294 vis
->greenBits
= greenBits
;
295 vis
->blueBits
= blueBits
;
296 vis
->alphaBits
= alphaBits
;
297 vis
->rgbBits
= redBits
+ greenBits
+ blueBits
;
300 vis
->depthBits
= depthBits
;
301 vis
->stencilBits
= stencilBits
;
303 vis
->accumRedBits
= accumRedBits
;
304 vis
->accumGreenBits
= accumGreenBits
;
305 vis
->accumBlueBits
= accumBlueBits
;
306 vis
->accumAlphaBits
= accumAlphaBits
;
308 vis
->haveAccumBuffer
= accumRedBits
> 0;
309 vis
->haveDepthBuffer
= depthBits
> 0;
310 vis
->haveStencilBuffer
= stencilBits
> 0;
312 vis
->numAuxBuffers
= 0;
314 vis
->sampleBuffers
= numSamples
> 0 ? 1 : 0;
315 vis
->samples
= numSamples
;
322 * Destroy a visual and free its memory.
326 * Frees the visual structure.
329 _mesa_destroy_visual( struct gl_config
*vis
)
337 /**********************************************************************/
338 /** \name Context allocation, initialization, destroying
340 * The purpose of the most initialization functions here is to provide the
341 * default state values according to the OpenGL specification.
343 /**********************************************************************/
348 * One-time initialization mutex lock.
350 * \sa Used by one_time_init().
352 mtx_t OneTimeLock
= _MTX_INITIALIZER_NP
;
356 * Calls all the various one-time-fini functions in Mesa
362 _mesa_destroy_shader_compiler();
367 * Calls all the various one-time-init functions in Mesa.
369 * While holding a global mutex lock, calls several initialization functions,
370 * and sets the glapi callbacks if the \c MESA_DEBUG environment variable is
376 one_time_init( struct gl_context
*ctx
)
378 static GLbitfield api_init_mask
= 0x0;
380 mtx_lock(&OneTimeLock
);
382 /* truly one-time init */
383 if (!api_init_mask
) {
386 STATIC_ASSERT(sizeof(GLbyte
) == 1);
387 STATIC_ASSERT(sizeof(GLubyte
) == 1);
388 STATIC_ASSERT(sizeof(GLshort
) == 2);
389 STATIC_ASSERT(sizeof(GLushort
) == 2);
390 STATIC_ASSERT(sizeof(GLint
) == 4);
391 STATIC_ASSERT(sizeof(GLuint
) == 4);
395 _mesa_one_time_init_extension_overrides(ctx
);
397 _mesa_get_cpu_features();
399 for (i
= 0; i
< 256; i
++) {
400 _mesa_ubyte_to_float_color_tab
[i
] = (float) i
/ 255.0F
;
403 atexit(one_time_fini
);
406 if (MESA_VERBOSE
!= 0) {
407 _mesa_debug(ctx
, "Mesa " PACKAGE_VERSION
" DEBUG build"
409 " (" MESA_GIT_SHA1
")"
416 /* per-API one-time init */
417 if (!(api_init_mask
& (1 << ctx
->API
))) {
418 _mesa_init_remap_table();
421 api_init_mask
|= 1 << ctx
->API
;
423 mtx_unlock(&OneTimeLock
);
428 * Initialize fields of gl_current_attrib (aka ctx->Current.*)
431 _mesa_init_current(struct gl_context
*ctx
)
435 /* Init all to (0,0,0,1) */
436 for (i
= 0; i
< ARRAY_SIZE(ctx
->Current
.Attrib
); i
++) {
437 ASSIGN_4V( ctx
->Current
.Attrib
[i
], 0.0, 0.0, 0.0, 1.0 );
440 /* redo special cases: */
441 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_NORMAL
], 0.0, 0.0, 1.0, 1.0 );
442 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_COLOR0
], 1.0, 1.0, 1.0, 1.0 );
443 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_COLOR1
], 0.0, 0.0, 0.0, 1.0 );
444 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_COLOR_INDEX
], 1.0, 0.0, 0.0, 1.0 );
445 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_EDGEFLAG
], 1.0, 0.0, 0.0, 1.0 );
450 * Init vertex/fragment/geometry program limits.
451 * Important: drivers should override these with actual limits.
454 init_program_limits(struct gl_constants
*consts
, gl_shader_stage stage
,
455 struct gl_program_constants
*prog
)
457 prog
->MaxInstructions
= MAX_PROGRAM_INSTRUCTIONS
;
458 prog
->MaxAluInstructions
= MAX_PROGRAM_INSTRUCTIONS
;
459 prog
->MaxTexInstructions
= MAX_PROGRAM_INSTRUCTIONS
;
460 prog
->MaxTexIndirections
= MAX_PROGRAM_INSTRUCTIONS
;
461 prog
->MaxTemps
= MAX_PROGRAM_TEMPS
;
462 prog
->MaxEnvParams
= MAX_PROGRAM_ENV_PARAMS
;
463 prog
->MaxLocalParams
= MAX_PROGRAM_LOCAL_PARAMS
;
464 prog
->MaxAddressOffset
= MAX_PROGRAM_LOCAL_PARAMS
;
467 case MESA_SHADER_VERTEX
:
468 prog
->MaxParameters
= MAX_VERTEX_PROGRAM_PARAMS
;
469 prog
->MaxAttribs
= MAX_VERTEX_GENERIC_ATTRIBS
;
470 prog
->MaxAddressRegs
= MAX_VERTEX_PROGRAM_ADDRESS_REGS
;
471 prog
->MaxUniformComponents
= 4 * MAX_UNIFORMS
;
472 prog
->MaxInputComponents
= 0; /* value not used */
473 prog
->MaxOutputComponents
= 16 * 4; /* old limit not to break tnl and swrast */
475 case MESA_SHADER_FRAGMENT
:
476 prog
->MaxParameters
= MAX_FRAGMENT_PROGRAM_PARAMS
;
477 prog
->MaxAttribs
= MAX_FRAGMENT_PROGRAM_INPUTS
;
478 prog
->MaxAddressRegs
= MAX_FRAGMENT_PROGRAM_ADDRESS_REGS
;
479 prog
->MaxUniformComponents
= 4 * MAX_UNIFORMS
;
480 prog
->MaxInputComponents
= 16 * 4; /* old limit not to break tnl and swrast */
481 prog
->MaxOutputComponents
= 0; /* value not used */
483 case MESA_SHADER_TESS_CTRL
:
484 case MESA_SHADER_TESS_EVAL
:
485 case MESA_SHADER_GEOMETRY
:
486 prog
->MaxParameters
= MAX_VERTEX_PROGRAM_PARAMS
;
487 prog
->MaxAttribs
= MAX_VERTEX_GENERIC_ATTRIBS
;
488 prog
->MaxAddressRegs
= MAX_VERTEX_PROGRAM_ADDRESS_REGS
;
489 prog
->MaxUniformComponents
= 4 * MAX_UNIFORMS
;
490 prog
->MaxInputComponents
= 16 * 4; /* old limit not to break tnl and swrast */
491 prog
->MaxOutputComponents
= 16 * 4; /* old limit not to break tnl and swrast */
493 case MESA_SHADER_COMPUTE
:
494 prog
->MaxParameters
= 0; /* not meaningful for compute shaders */
495 prog
->MaxAttribs
= 0; /* not meaningful for compute shaders */
496 prog
->MaxAddressRegs
= 0; /* not meaningful for compute shaders */
497 prog
->MaxUniformComponents
= 4 * MAX_UNIFORMS
;
498 prog
->MaxInputComponents
= 0; /* not meaningful for compute shaders */
499 prog
->MaxOutputComponents
= 0; /* not meaningful for compute shaders */
502 assert(0 && "Bad shader stage in init_program_limits()");
505 /* Set the native limits to zero. This implies that there is no native
506 * support for shaders. Let the drivers fill in the actual values.
508 prog
->MaxNativeInstructions
= 0;
509 prog
->MaxNativeAluInstructions
= 0;
510 prog
->MaxNativeTexInstructions
= 0;
511 prog
->MaxNativeTexIndirections
= 0;
512 prog
->MaxNativeAttribs
= 0;
513 prog
->MaxNativeTemps
= 0;
514 prog
->MaxNativeAddressRegs
= 0;
515 prog
->MaxNativeParameters
= 0;
517 /* Set GLSL datatype range/precision info assuming IEEE float values.
518 * Drivers should override these defaults as needed.
520 prog
->MediumFloat
.RangeMin
= 127;
521 prog
->MediumFloat
.RangeMax
= 127;
522 prog
->MediumFloat
.Precision
= 23;
523 prog
->LowFloat
= prog
->HighFloat
= prog
->MediumFloat
;
525 /* Assume ints are stored as floats for now, since this is the least-common
526 * denominator. The OpenGL ES spec implies (page 132) that the precision
527 * of integer types should be 0. Practically speaking, IEEE
528 * single-precision floating point values can only store integers in the
529 * range [-0x01000000, 0x01000000] without loss of precision.
531 prog
->MediumInt
.RangeMin
= 24;
532 prog
->MediumInt
.RangeMax
= 24;
533 prog
->MediumInt
.Precision
= 0;
534 prog
->LowInt
= prog
->HighInt
= prog
->MediumInt
;
536 prog
->MaxUniformBlocks
= 12;
537 prog
->MaxCombinedUniformComponents
= (prog
->MaxUniformComponents
+
538 consts
->MaxUniformBlockSize
/ 4 *
539 prog
->MaxUniformBlocks
);
541 prog
->MaxAtomicBuffers
= 0;
542 prog
->MaxAtomicCounters
= 0;
544 prog
->MaxShaderStorageBlocks
= 8;
549 * Initialize fields of gl_constants (aka ctx->Const.*).
550 * Use defaults from config.h. The device drivers will often override
551 * some of these values (such as number of texture units).
554 _mesa_init_constants(struct gl_constants
*consts
, gl_api api
)
559 /* Constants, may be overriden (usually only reduced) by device drivers */
560 consts
->MaxTextureMbytes
= MAX_TEXTURE_MBYTES
;
561 consts
->MaxTextureLevels
= MAX_TEXTURE_LEVELS
;
562 consts
->Max3DTextureLevels
= MAX_3D_TEXTURE_LEVELS
;
563 consts
->MaxCubeTextureLevels
= MAX_CUBE_TEXTURE_LEVELS
;
564 consts
->MaxTextureRectSize
= MAX_TEXTURE_RECT_SIZE
;
565 consts
->MaxArrayTextureLayers
= MAX_ARRAY_TEXTURE_LAYERS
;
566 consts
->MaxTextureCoordUnits
= MAX_TEXTURE_COORD_UNITS
;
567 consts
->Program
[MESA_SHADER_FRAGMENT
].MaxTextureImageUnits
= MAX_TEXTURE_IMAGE_UNITS
;
568 consts
->MaxTextureUnits
= MIN2(consts
->MaxTextureCoordUnits
,
569 consts
->Program
[MESA_SHADER_FRAGMENT
].MaxTextureImageUnits
);
570 consts
->MaxTextureMaxAnisotropy
= MAX_TEXTURE_MAX_ANISOTROPY
;
571 consts
->MaxTextureLodBias
= MAX_TEXTURE_LOD_BIAS
;
572 consts
->MaxTextureBufferSize
= 65536;
573 consts
->TextureBufferOffsetAlignment
= 1;
574 consts
->MaxArrayLockSize
= MAX_ARRAY_LOCK_SIZE
;
575 consts
->SubPixelBits
= SUB_PIXEL_BITS
;
576 consts
->MinPointSize
= MIN_POINT_SIZE
;
577 consts
->MaxPointSize
= MAX_POINT_SIZE
;
578 consts
->MinPointSizeAA
= MIN_POINT_SIZE
;
579 consts
->MaxPointSizeAA
= MAX_POINT_SIZE
;
580 consts
->PointSizeGranularity
= (GLfloat
) POINT_SIZE_GRANULARITY
;
581 consts
->MinLineWidth
= MIN_LINE_WIDTH
;
582 consts
->MaxLineWidth
= MAX_LINE_WIDTH
;
583 consts
->MinLineWidthAA
= MIN_LINE_WIDTH
;
584 consts
->MaxLineWidthAA
= MAX_LINE_WIDTH
;
585 consts
->LineWidthGranularity
= (GLfloat
) LINE_WIDTH_GRANULARITY
;
586 consts
->MaxClipPlanes
= 6;
587 consts
->MaxLights
= MAX_LIGHTS
;
588 consts
->MaxShininess
= 128.0;
589 consts
->MaxSpotExponent
= 128.0;
590 consts
->MaxViewportWidth
= 16384;
591 consts
->MaxViewportHeight
= 16384;
592 consts
->MinMapBufferAlignment
= 64;
594 /* Driver must override these values if ARB_viewport_array is supported. */
595 consts
->MaxViewports
= 1;
596 consts
->ViewportSubpixelBits
= 0;
597 consts
->ViewportBounds
.Min
= 0;
598 consts
->ViewportBounds
.Max
= 0;
600 /** GL_ARB_uniform_buffer_object */
601 consts
->MaxCombinedUniformBlocks
= 36;
602 consts
->MaxUniformBufferBindings
= 36;
603 consts
->MaxUniformBlockSize
= 16384;
604 consts
->UniformBufferOffsetAlignment
= 1;
606 /** GL_ARB_shader_storage_buffer_object */
607 consts
->MaxCombinedShaderStorageBlocks
= 8;
608 consts
->MaxShaderStorageBufferBindings
= 8;
609 consts
->MaxShaderStorageBlockSize
= 128 * 1024 * 1024; /* 2^27 */
610 consts
->ShaderStorageBufferOffsetAlignment
= 256;
612 /* GL_ARB_explicit_uniform_location, GL_MAX_UNIFORM_LOCATIONS */
613 consts
->MaxUserAssignableUniformLocations
=
614 4 * MESA_SHADER_STAGES
* MAX_UNIFORMS
;
616 for (i
= 0; i
< MESA_SHADER_STAGES
; i
++)
617 init_program_limits(consts
, i
, &consts
->Program
[i
]);
619 consts
->MaxProgramMatrices
= MAX_PROGRAM_MATRICES
;
620 consts
->MaxProgramMatrixStackDepth
= MAX_PROGRAM_MATRIX_STACK_DEPTH
;
622 /* Assume that if GLSL 1.30+ (or GLSL ES 3.00+) is supported that
623 * gl_VertexID is implemented using a native hardware register with OpenGL
626 consts
->VertexID_is_zero_based
= false;
628 /* GL_ARB_draw_buffers */
629 consts
->MaxDrawBuffers
= MAX_DRAW_BUFFERS
;
631 consts
->MaxColorAttachments
= MAX_COLOR_ATTACHMENTS
;
632 consts
->MaxRenderbufferSize
= MAX_RENDERBUFFER_SIZE
;
634 consts
->Program
[MESA_SHADER_VERTEX
].MaxTextureImageUnits
= MAX_TEXTURE_IMAGE_UNITS
;
635 consts
->MaxCombinedTextureImageUnits
= MAX_COMBINED_TEXTURE_IMAGE_UNITS
;
636 consts
->MaxVarying
= 16; /* old limit not to break tnl and swrast */
637 consts
->Program
[MESA_SHADER_GEOMETRY
].MaxTextureImageUnits
= MAX_TEXTURE_IMAGE_UNITS
;
638 consts
->MaxGeometryOutputVertices
= MAX_GEOMETRY_OUTPUT_VERTICES
;
639 consts
->MaxGeometryTotalOutputComponents
= MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS
;
642 consts
->GenerateTemporaryNames
= true;
644 consts
->GenerateTemporaryNames
= false;
647 /* GL_ARB_framebuffer_object */
648 consts
->MaxSamples
= 0;
650 /* GLSL default if NativeIntegers == FALSE */
651 consts
->UniformBooleanTrue
= FLOAT_AS_UNION(1.0f
).u
;
654 consts
->MaxServerWaitTimeout
= 0x7fffffff7fffffffULL
;
656 /* GL_EXT_provoking_vertex */
657 consts
->QuadsFollowProvokingVertexConvention
= GL_TRUE
;
659 /** GL_ARB_viewport_array */
660 consts
->LayerAndVPIndexProvokingVertex
= GL_UNDEFINED_VERTEX
;
662 /* GL_EXT_transform_feedback */
663 consts
->MaxTransformFeedbackBuffers
= MAX_FEEDBACK_BUFFERS
;
664 consts
->MaxTransformFeedbackSeparateComponents
= 4 * MAX_FEEDBACK_ATTRIBS
;
665 consts
->MaxTransformFeedbackInterleavedComponents
= 4 * MAX_FEEDBACK_ATTRIBS
;
666 consts
->MaxVertexStreams
= 1;
669 consts
->ProfileMask
= api
== API_OPENGL_CORE
670 ? GL_CONTEXT_CORE_PROFILE_BIT
671 : GL_CONTEXT_COMPATIBILITY_PROFILE_BIT
;
674 consts
->MaxVertexAttribStride
= 2048;
676 /** GL_EXT_gpu_shader4 */
677 consts
->MinProgramTexelOffset
= -8;
678 consts
->MaxProgramTexelOffset
= 7;
680 /* GL_ARB_texture_gather */
681 consts
->MinProgramTextureGatherOffset
= -8;
682 consts
->MaxProgramTextureGatherOffset
= 7;
684 /* GL_ARB_robustness */
685 consts
->ResetStrategy
= GL_NO_RESET_NOTIFICATION_ARB
;
687 /* GL_KHR_robustness */
688 consts
->RobustAccess
= GL_FALSE
;
690 /* ES 3.0 or ARB_ES3_compatibility */
691 consts
->MaxElementIndex
= 0xffffffffu
;
693 /* GL_ARB_texture_multisample */
694 consts
->MaxColorTextureSamples
= 1;
695 consts
->MaxDepthTextureSamples
= 1;
696 consts
->MaxIntegerSamples
= 1;
698 /* GL_ARB_shader_atomic_counters */
699 consts
->MaxAtomicBufferBindings
= MAX_COMBINED_ATOMIC_BUFFERS
;
700 consts
->MaxAtomicBufferSize
= MAX_ATOMIC_COUNTERS
* ATOMIC_COUNTER_SIZE
;
701 consts
->MaxCombinedAtomicBuffers
= MAX_COMBINED_ATOMIC_BUFFERS
;
702 consts
->MaxCombinedAtomicCounters
= MAX_ATOMIC_COUNTERS
;
704 /* GL_ARB_vertex_attrib_binding */
705 consts
->MaxVertexAttribRelativeOffset
= 2047;
706 consts
->MaxVertexAttribBindings
= MAX_VERTEX_GENERIC_ATTRIBS
;
708 /* GL_ARB_compute_shader */
709 consts
->MaxComputeWorkGroupCount
[0] = 65535;
710 consts
->MaxComputeWorkGroupCount
[1] = 65535;
711 consts
->MaxComputeWorkGroupCount
[2] = 65535;
712 consts
->MaxComputeWorkGroupSize
[0] = 1024;
713 consts
->MaxComputeWorkGroupSize
[1] = 1024;
714 consts
->MaxComputeWorkGroupSize
[2] = 64;
715 /* Enables compute support for GLES 3.1 if >= 128 */
716 consts
->MaxComputeWorkGroupInvocations
= 0;
718 /** GL_ARB_gpu_shader5 */
719 consts
->MinFragmentInterpolationOffset
= MIN_FRAGMENT_INTERPOLATION_OFFSET
;
720 consts
->MaxFragmentInterpolationOffset
= MAX_FRAGMENT_INTERPOLATION_OFFSET
;
722 /** GL_KHR_context_flush_control */
723 consts
->ContextReleaseBehavior
= GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH
;
725 /** GL_ARB_tessellation_shader */
726 consts
->MaxTessGenLevel
= MAX_TESS_GEN_LEVEL
;
727 consts
->MaxPatchVertices
= MAX_PATCH_VERTICES
;
728 consts
->Program
[MESA_SHADER_TESS_CTRL
].MaxTextureImageUnits
= MAX_TEXTURE_IMAGE_UNITS
;
729 consts
->Program
[MESA_SHADER_TESS_EVAL
].MaxTextureImageUnits
= MAX_TEXTURE_IMAGE_UNITS
;
730 consts
->MaxTessPatchComponents
= MAX_TESS_PATCH_COMPONENTS
;
731 consts
->MaxTessControlTotalOutputComponents
= MAX_TESS_CONTROL_TOTAL_OUTPUT_COMPONENTS
;
732 consts
->PrimitiveRestartForPatches
= false;
734 /** GL_ARB_compute_variable_group_size */
735 consts
->MaxComputeVariableGroupSize
[0] = 512;
736 consts
->MaxComputeVariableGroupSize
[1] = 512;
737 consts
->MaxComputeVariableGroupSize
[2] = 64;
738 consts
->MaxComputeVariableGroupInvocations
= 512;
740 /** GL_NV_conservative_raster */
741 consts
->MaxSubpixelPrecisionBiasBits
= 0;
743 /** GL_NV_conservative_raster_dilate */
744 consts
->ConservativeRasterDilateRange
[0] = 0.0;
745 consts
->ConservativeRasterDilateRange
[0] = 0.0;
746 consts
->ConservativeRasterDilateGranularity
= 0.0;
751 * Do some sanity checks on the limits/constants for the given context.
752 * Only called the first time a context is bound.
755 check_context_limits(struct gl_context
*ctx
)
759 /* check that we don't exceed the size of various bitfields */
760 assert(VARYING_SLOT_MAX
<=
761 (8 * sizeof(ctx
->VertexProgram
._Current
->info
.outputs_written
)));
762 assert(VARYING_SLOT_MAX
<=
763 (8 * sizeof(ctx
->FragmentProgram
._Current
->info
.inputs_read
)));
765 /* shader-related checks */
766 assert(ctx
->Const
.Program
[MESA_SHADER_FRAGMENT
].MaxLocalParams
<= MAX_PROGRAM_LOCAL_PARAMS
);
767 assert(ctx
->Const
.Program
[MESA_SHADER_VERTEX
].MaxLocalParams
<= MAX_PROGRAM_LOCAL_PARAMS
);
769 /* Texture unit checks */
770 assert(ctx
->Const
.Program
[MESA_SHADER_FRAGMENT
].MaxTextureImageUnits
> 0);
771 assert(ctx
->Const
.Program
[MESA_SHADER_FRAGMENT
].MaxTextureImageUnits
<= MAX_TEXTURE_IMAGE_UNITS
);
772 assert(ctx
->Const
.MaxTextureCoordUnits
> 0);
773 assert(ctx
->Const
.MaxTextureCoordUnits
<= MAX_TEXTURE_COORD_UNITS
);
774 assert(ctx
->Const
.MaxTextureUnits
> 0);
775 assert(ctx
->Const
.MaxTextureUnits
<= MAX_TEXTURE_IMAGE_UNITS
);
776 assert(ctx
->Const
.MaxTextureUnits
<= MAX_TEXTURE_COORD_UNITS
);
777 assert(ctx
->Const
.MaxTextureUnits
== MIN2(ctx
->Const
.Program
[MESA_SHADER_FRAGMENT
].MaxTextureImageUnits
,
778 ctx
->Const
.MaxTextureCoordUnits
));
779 assert(ctx
->Const
.MaxCombinedTextureImageUnits
> 0);
780 assert(ctx
->Const
.MaxCombinedTextureImageUnits
<= MAX_COMBINED_TEXTURE_IMAGE_UNITS
);
781 assert(ctx
->Const
.MaxTextureCoordUnits
<= MAX_COMBINED_TEXTURE_IMAGE_UNITS
);
782 /* number of coord units cannot be greater than number of image units */
783 assert(ctx
->Const
.MaxTextureCoordUnits
<= ctx
->Const
.Program
[MESA_SHADER_FRAGMENT
].MaxTextureImageUnits
);
786 /* Texture size checks */
787 assert(ctx
->Const
.MaxTextureLevels
<= MAX_TEXTURE_LEVELS
);
788 assert(ctx
->Const
.Max3DTextureLevels
<= MAX_3D_TEXTURE_LEVELS
);
789 assert(ctx
->Const
.MaxCubeTextureLevels
<= MAX_CUBE_TEXTURE_LEVELS
);
790 assert(ctx
->Const
.MaxTextureRectSize
<= MAX_TEXTURE_RECT_SIZE
);
792 /* Texture level checks */
793 assert(MAX_TEXTURE_LEVELS
>= MAX_3D_TEXTURE_LEVELS
);
794 assert(MAX_TEXTURE_LEVELS
>= MAX_CUBE_TEXTURE_LEVELS
);
796 /* Max texture size should be <= max viewport size (render to texture) */
797 assert((1U << (ctx
->Const
.MaxTextureLevels
- 1))
798 <= ctx
->Const
.MaxViewportWidth
);
799 assert((1U << (ctx
->Const
.MaxTextureLevels
- 1))
800 <= ctx
->Const
.MaxViewportHeight
);
802 assert(ctx
->Const
.MaxDrawBuffers
<= MAX_DRAW_BUFFERS
);
804 /* if this fails, add more enum values to gl_buffer_index */
805 assert(BUFFER_COLOR0
+ MAX_DRAW_BUFFERS
<= BUFFER_COUNT
);
807 /* XXX probably add more tests */
812 * Initialize the attribute groups in a GL context.
814 * \param ctx GL context.
816 * Initializes all the attributes, calling the respective <tt>init*</tt>
817 * functions for the more complex data structures.
820 init_attrib_groups(struct gl_context
*ctx
)
825 _mesa_init_constants(&ctx
->Const
, ctx
->API
);
828 _mesa_init_extensions(&ctx
->Extensions
);
830 /* Attribute Groups */
831 _mesa_init_accum( ctx
);
832 _mesa_init_attrib( ctx
);
833 _mesa_init_bbox( ctx
);
834 _mesa_init_buffer_objects( ctx
);
835 _mesa_init_color( ctx
);
836 _mesa_init_conservative_raster( ctx
);
837 _mesa_init_current( ctx
);
838 _mesa_init_depth( ctx
);
839 _mesa_init_debug( ctx
);
840 _mesa_init_debug_output( ctx
);
841 _mesa_init_display_list( ctx
);
842 _mesa_init_eval( ctx
);
843 _mesa_init_fbobjects( ctx
);
844 _mesa_init_feedback( ctx
);
845 _mesa_init_fog( ctx
);
846 _mesa_init_hint( ctx
);
847 _mesa_init_image_units( ctx
);
848 _mesa_init_line( ctx
);
849 _mesa_init_lighting( ctx
);
850 _mesa_init_matrix( ctx
);
851 _mesa_init_multisample( ctx
);
852 _mesa_init_performance_monitors( ctx
);
853 _mesa_init_performance_queries( ctx
);
854 _mesa_init_pipeline( ctx
);
855 _mesa_init_pixel( ctx
);
856 _mesa_init_pixelstore( ctx
);
857 _mesa_init_point( ctx
);
858 _mesa_init_polygon( ctx
);
859 _mesa_init_program( ctx
);
860 _mesa_init_queryobj( ctx
);
861 _mesa_init_sync( ctx
);
862 _mesa_init_rastpos( ctx
);
863 _mesa_init_scissor( ctx
);
864 _mesa_init_shader_state( ctx
);
865 _mesa_init_stencil( ctx
);
866 _mesa_init_transform( ctx
);
867 _mesa_init_transform_feedback( ctx
);
868 _mesa_init_varray( ctx
);
869 _mesa_init_viewport( ctx
);
870 _mesa_init_resident_handles( ctx
);
872 if (!_mesa_init_texture( ctx
))
876 ctx
->TileRasterOrderIncreasingX
= GL_TRUE
;
877 ctx
->TileRasterOrderIncreasingY
= GL_TRUE
;
878 ctx
->NewState
= _NEW_ALL
;
879 ctx
->NewDriverState
= ~0;
880 ctx
->ErrorValue
= GL_NO_ERROR
;
881 ctx
->ShareGroupReset
= false;
882 ctx
->varying_vp_inputs
= VERT_BIT_ALL
;
889 * Update default objects in a GL context with respect to shared state.
891 * \param ctx GL context.
893 * Removes references to old default objects, (texture objects, program
894 * objects, etc.) and changes to reference those from the current shared
898 update_default_objects(struct gl_context
*ctx
)
902 _mesa_update_default_objects_program(ctx
);
903 _mesa_update_default_objects_texture(ctx
);
904 _mesa_update_default_objects_buffer_objects(ctx
);
910 /* XXX this is temporary and should be removed at some point in the
911 * future when there's a reasonable expectation that the libGL library
912 * contains the _glapi_new_nop_table() and _glapi_set_nop_handler()
913 * functions which were added in Mesa 10.6.
916 /* Avoid libGL / driver ABI break */
917 #define USE_GLAPI_NOP_FEATURES 0
919 #define USE_GLAPI_NOP_FEATURES 1
924 * This function is called by the glapi no-op functions. For each OpenGL
925 * function/entrypoint there's a simple no-op function. These "no-op"
926 * functions call this function.
928 * If there's a current OpenGL context for the calling thread, we record a
929 * GL_INVALID_OPERATION error. This can happen either because the app's
930 * calling an unsupported extension function, or calling an illegal function
931 * (such as glClear between glBegin/glEnd).
933 * If there's no current OpenGL context for the calling thread, we can
934 * print a message to stderr.
936 * \param name the name of the OpenGL function
938 #if USE_GLAPI_NOP_FEATURES
940 nop_handler(const char *name
)
942 GET_CURRENT_CONTEXT(ctx
);
944 _mesa_error(ctx
, GL_INVALID_OPERATION
, "%s(invalid call)", name
);
947 else if (getenv("MESA_DEBUG") || getenv("LIBGL_DEBUG")) {
949 "GL User Error: gl%s called without a rendering context\n",
959 * Special no-op glFlush, see below.
962 static void GLAPIENTRY
965 /* don't record an error like we do in nop_handler() */
970 #if !USE_GLAPI_NOP_FEATURES
974 GET_CURRENT_CONTEXT(ctx
);
975 _mesa_error(ctx
, GL_INVALID_OPERATION
,
976 "unsupported function called "
977 "(unsupported extension or deprecated function?)");
984 * Create a new API dispatch table in which all entries point to the
985 * generic_nop() function. This will not work on Windows because of
986 * the __stdcall convention which requires the callee to clean up the
987 * call stack. That's impossible with one generic no-op function.
989 struct _glapi_table
*
990 _mesa_new_nop_table(unsigned numEntries
)
992 struct _glapi_table
*table
;
994 #if !USE_GLAPI_NOP_FEATURES
995 table
= malloc(numEntries
* sizeof(_glapi_proc
));
997 _glapi_proc
*entry
= (_glapi_proc
*) table
;
999 for (i
= 0; i
< numEntries
; i
++) {
1000 entry
[i
] = (_glapi_proc
) generic_nop
;
1004 table
= _glapi_new_nop_table(numEntries
);
1011 * Allocate and initialize a new dispatch table. The table will be
1012 * populated with pointers to "no-op" functions. In turn, the no-op
1013 * functions will call nop_handler() above.
1015 struct _glapi_table
*
1016 _mesa_alloc_dispatch_table(void)
1018 /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
1019 * In practice, this'll be the same for stand-alone Mesa. But for DRI
1020 * Mesa we do this to accommodate different versions of libGL and various
1023 int numEntries
= MAX2(_glapi_get_dispatch_table_size(), _gloffset_COUNT
);
1025 struct _glapi_table
*table
= _mesa_new_nop_table(numEntries
);
1029 /* This is a special case for Windows in the event that
1030 * wglGetProcAddress is called between glBegin/End().
1032 * The MS opengl32.dll library apparently calls glFlush from
1033 * wglGetProcAddress(). If we're inside glBegin/End(), glFlush
1034 * will dispatch to _mesa_generic_nop() and we'll generate a
1035 * GL_INVALID_OPERATION error.
1037 * The specific case which hits this is piglit's primitive-restart
1038 * test which calls glPrimitiveRestartNV() inside glBegin/End. The
1039 * first time we call glPrimitiveRestartNV() Piglit's API dispatch
1040 * code will try to resolve the function by calling wglGetProcAddress.
1041 * This raises GL_INVALID_OPERATION and an assert(glGetError()==0)
1042 * will fail causing the test to fail. By suppressing the error, the
1043 * assertion passes and the test continues.
1045 SET_Flush(table
, nop_glFlush
);
1049 #if USE_GLAPI_NOP_FEATURES
1050 _glapi_set_nop_handler(nop_handler
);
1057 * Creates a minimal dispatch table for use within glBegin()/glEnd().
1059 * This ensures that we generate GL_INVALID_OPERATION errors from most
1060 * functions, since the set of functions that are valid within Begin/End is
1063 * From the GL 1.0 specification section 2.6.3, "GL Commands within
1066 * "The only GL commands that are allowed within any Begin/End pairs are
1067 * the commands for specifying vertex coordinates, vertex color, normal
1068 * coordinates, and texture coordinates (Vertex, Color, Index, Normal,
1069 * TexCoord), EvalCoord and EvalPoint commands (see section 5.1),
1070 * commands for specifying lighting material parameters (Material
1071 * commands see section 2.12.2), display list invocation commands
1072 * (CallList and CallLists see section 5.4), and the EdgeFlag
1073 * command. Executing Begin after Begin has already been executed but
1074 * before an End is issued generates the INVALID OPERATION error, as does
1075 * executing End without a previous corresponding Begin. Executing any
1076 * other GL command within Begin/End results in the error INVALID
1079 * The table entries for specifying vertex attributes are set up by
1080 * install_vtxfmt() and _mesa_loopback_init_api_table(), and End() and dlists
1081 * are set by install_vtxfmt() as well.
1083 static struct _glapi_table
*
1084 create_beginend_table(const struct gl_context
*ctx
)
1086 struct _glapi_table
*table
;
1088 table
= _mesa_alloc_dispatch_table();
1092 /* Fill in functions which return a value, since they should return some
1093 * specific value even if they emit a GL_INVALID_OPERATION error from them
1094 * being called within glBegin()/glEnd().
1096 #define COPY_DISPATCH(func) SET_##func(table, GET_##func(ctx->Exec))
1098 COPY_DISPATCH(GenLists
);
1099 COPY_DISPATCH(IsProgram
);
1100 COPY_DISPATCH(IsVertexArray
);
1101 COPY_DISPATCH(IsBuffer
);
1102 COPY_DISPATCH(IsEnabled
);
1103 COPY_DISPATCH(IsEnabledi
);
1104 COPY_DISPATCH(IsRenderbuffer
);
1105 COPY_DISPATCH(IsFramebuffer
);
1106 COPY_DISPATCH(CheckFramebufferStatus
);
1107 COPY_DISPATCH(RenderMode
);
1108 COPY_DISPATCH(GetString
);
1109 COPY_DISPATCH(GetStringi
);
1110 COPY_DISPATCH(GetPointerv
);
1111 COPY_DISPATCH(IsQuery
);
1112 COPY_DISPATCH(IsSampler
);
1113 COPY_DISPATCH(IsSync
);
1114 COPY_DISPATCH(IsTexture
);
1115 COPY_DISPATCH(IsTransformFeedback
);
1116 COPY_DISPATCH(DeleteQueries
);
1117 COPY_DISPATCH(AreTexturesResident
);
1118 COPY_DISPATCH(FenceSync
);
1119 COPY_DISPATCH(ClientWaitSync
);
1120 COPY_DISPATCH(MapBuffer
);
1121 COPY_DISPATCH(UnmapBuffer
);
1122 COPY_DISPATCH(MapBufferRange
);
1123 COPY_DISPATCH(ObjectPurgeableAPPLE
);
1124 COPY_DISPATCH(ObjectUnpurgeableAPPLE
);
1126 _mesa_loopback_init_api_table(ctx
, table
);
1132 _mesa_initialize_dispatch_tables(struct gl_context
*ctx
)
1134 /* Do the code-generated setup of the exec table in api_exec.c. */
1135 _mesa_initialize_exec_table(ctx
);
1138 _mesa_initialize_save_table(ctx
);
1142 * Initialize a struct gl_context struct (rendering context).
1144 * This includes allocating all the other structs and arrays which hang off of
1145 * the context by pointers.
1146 * Note that the driver needs to pass in its dd_function_table here since
1147 * we need to at least call driverFunctions->NewTextureObject to create the
1148 * default texture objects.
1150 * Called by _mesa_create_context().
1152 * Performs the imports and exports callback tables initialization, and
1153 * miscellaneous one-time initializations. If no shared context is supplied one
1154 * is allocated, and increase its reference count. Setups the GL API dispatch
1155 * tables. Initialize the TNL module. Sets the maximum Z buffer depth.
1156 * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
1159 * \param ctx the context to initialize
1160 * \param api the GL API type to create the context for
1161 * \param visual describes the visual attributes for this context or NULL to
1162 * create a configless context
1163 * \param share_list points to context to share textures, display lists,
1165 * \param driverFunctions table of device driver functions for this context
1169 _mesa_initialize_context(struct gl_context
*ctx
,
1171 const struct gl_config
*visual
,
1172 struct gl_context
*share_list
,
1173 const struct dd_function_table
*driverFunctions
)
1175 struct gl_shared_state
*shared
;
1178 assert(driverFunctions
->NewTextureObject
);
1179 assert(driverFunctions
->FreeTextureImageBuffer
);
1182 ctx
->DrawBuffer
= NULL
;
1183 ctx
->ReadBuffer
= NULL
;
1184 ctx
->WinSysDrawBuffer
= NULL
;
1185 ctx
->WinSysReadBuffer
= NULL
;
1188 ctx
->Visual
= *visual
;
1189 ctx
->HasConfig
= GL_TRUE
;
1192 memset(&ctx
->Visual
, 0, sizeof ctx
->Visual
);
1193 ctx
->HasConfig
= GL_FALSE
;
1196 _mesa_override_gl_version(ctx
);
1198 /* misc one-time initializations */
1201 /* Plug in driver functions and context pointer here.
1202 * This is important because when we call alloc_shared_state() below
1203 * we'll call ctx->Driver.NewTextureObject() to create the default
1206 ctx
->Driver
= *driverFunctions
;
1209 /* share state with another context */
1210 shared
= share_list
->Shared
;
1213 /* allocate new, unshared state */
1214 shared
= _mesa_alloc_shared_state(ctx
);
1219 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, shared
);
1221 if (!init_attrib_groups( ctx
))
1224 /* KHR_no_error is likely to crash, overflow memory, etc if an application
1225 * has errors so don't enable it for setuid processes.
1227 if (env_var_as_boolean("MESA_NO_ERROR", false)) {
1228 #if !defined(_WIN32)
1229 if (geteuid() == getuid())
1231 ctx
->Const
.ContextFlags
|= GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR
;
1234 /* setup the API dispatch tables with all nop functions */
1235 ctx
->OutsideBeginEnd
= _mesa_alloc_dispatch_table();
1236 if (!ctx
->OutsideBeginEnd
)
1238 ctx
->Exec
= ctx
->OutsideBeginEnd
;
1239 ctx
->CurrentClientDispatch
= ctx
->CurrentServerDispatch
= ctx
->OutsideBeginEnd
;
1241 ctx
->FragmentProgram
._MaintainTexEnvProgram
1242 = (getenv("MESA_TEX_PROG") != NULL
);
1244 ctx
->VertexProgram
._MaintainTnlProgram
1245 = (getenv("MESA_TNL_PROG") != NULL
);
1246 if (ctx
->VertexProgram
._MaintainTnlProgram
) {
1247 /* this is required... */
1248 ctx
->FragmentProgram
._MaintainTexEnvProgram
= GL_TRUE
;
1251 /* Mesa core handles all the formats that mesa core knows about.
1252 * Drivers will want to override this list with just the formats
1253 * they can handle, and confirm that appropriate fallbacks exist in
1254 * _mesa_choose_tex_format().
1256 memset(&ctx
->TextureFormatSupported
, GL_TRUE
,
1257 sizeof(ctx
->TextureFormatSupported
));
1260 case API_OPENGL_COMPAT
:
1261 ctx
->BeginEnd
= create_beginend_table(ctx
);
1262 ctx
->Save
= _mesa_alloc_dispatch_table();
1263 if (!ctx
->BeginEnd
|| !ctx
->Save
)
1267 case API_OPENGL_CORE
:
1271 * GL_OES_texture_cube_map says
1272 * "Initially all texture generation modes are set to REFLECTION_MAP_OES"
1274 for (i
= 0; i
< ARRAY_SIZE(ctx
->Texture
.FixedFuncUnit
); i
++) {
1275 struct gl_fixedfunc_texture_unit
*texUnit
=
1276 &ctx
->Texture
.FixedFuncUnit
[i
];
1278 texUnit
->GenS
.Mode
= GL_REFLECTION_MAP_NV
;
1279 texUnit
->GenT
.Mode
= GL_REFLECTION_MAP_NV
;
1280 texUnit
->GenR
.Mode
= GL_REFLECTION_MAP_NV
;
1281 texUnit
->GenS
._ModeBit
= TEXGEN_REFLECTION_MAP_NV
;
1282 texUnit
->GenT
._ModeBit
= TEXGEN_REFLECTION_MAP_NV
;
1283 texUnit
->GenR
._ModeBit
= TEXGEN_REFLECTION_MAP_NV
;
1287 ctx
->FragmentProgram
._MaintainTexEnvProgram
= GL_TRUE
;
1288 ctx
->VertexProgram
._MaintainTnlProgram
= GL_TRUE
;
1292 ctx
->FirstTimeCurrent
= GL_TRUE
;
1297 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, NULL
);
1298 free(ctx
->BeginEnd
);
1299 free(ctx
->OutsideBeginEnd
);
1306 * Free the data associated with the given context.
1308 * But doesn't free the struct gl_context struct itself.
1310 * \sa _mesa_initialize_context() and init_attrib_groups().
1313 _mesa_free_context_data( struct gl_context
*ctx
)
1315 if (!_mesa_get_current_context()){
1316 /* No current context, but we may need one in order to delete
1317 * texture objs, etc. So temporarily bind the context now.
1319 _mesa_make_current(ctx
, NULL
, NULL
);
1322 /* unreference WinSysDraw/Read buffers */
1323 _mesa_reference_framebuffer(&ctx
->WinSysDrawBuffer
, NULL
);
1324 _mesa_reference_framebuffer(&ctx
->WinSysReadBuffer
, NULL
);
1325 _mesa_reference_framebuffer(&ctx
->DrawBuffer
, NULL
);
1326 _mesa_reference_framebuffer(&ctx
->ReadBuffer
, NULL
);
1328 _mesa_reference_program(ctx
, &ctx
->VertexProgram
.Current
, NULL
);
1329 _mesa_reference_program(ctx
, &ctx
->VertexProgram
._Current
, NULL
);
1330 _mesa_reference_program(ctx
, &ctx
->VertexProgram
._TnlProgram
, NULL
);
1332 _mesa_reference_program(ctx
, &ctx
->TessCtrlProgram
._Current
, NULL
);
1333 _mesa_reference_program(ctx
, &ctx
->TessEvalProgram
._Current
, NULL
);
1334 _mesa_reference_program(ctx
, &ctx
->GeometryProgram
._Current
, NULL
);
1336 _mesa_reference_program(ctx
, &ctx
->FragmentProgram
.Current
, NULL
);
1337 _mesa_reference_program(ctx
, &ctx
->FragmentProgram
._Current
, NULL
);
1338 _mesa_reference_program(ctx
, &ctx
->FragmentProgram
._TexEnvProgram
, NULL
);
1340 _mesa_reference_program(ctx
, &ctx
->ComputeProgram
._Current
, NULL
);
1342 _mesa_reference_vao(ctx
, &ctx
->Array
.VAO
, NULL
);
1343 _mesa_reference_vao(ctx
, &ctx
->Array
.DefaultVAO
, NULL
);
1344 _mesa_reference_vao(ctx
, &ctx
->Array
._EmptyVAO
, NULL
);
1345 _mesa_reference_vao(ctx
, &ctx
->Array
._DrawVAO
, NULL
);
1347 _mesa_free_attrib_data(ctx
);
1348 _mesa_free_buffer_objects(ctx
);
1349 _mesa_free_eval_data( ctx
);
1350 _mesa_free_texture_data( ctx
);
1351 _mesa_free_matrix_data( ctx
);
1352 _mesa_free_pipeline_data(ctx
);
1353 _mesa_free_program_data(ctx
);
1354 _mesa_free_shader_state(ctx
);
1355 _mesa_free_queryobj_data(ctx
);
1356 _mesa_free_sync_data(ctx
);
1357 _mesa_free_varray_data(ctx
);
1358 _mesa_free_transform_feedback(ctx
);
1359 _mesa_free_performance_monitors(ctx
);
1360 _mesa_free_performance_queries(ctx
);
1361 _mesa_free_resident_handles(ctx
);
1363 _mesa_reference_buffer_object(ctx
, &ctx
->Pack
.BufferObj
, NULL
);
1364 _mesa_reference_buffer_object(ctx
, &ctx
->Unpack
.BufferObj
, NULL
);
1365 _mesa_reference_buffer_object(ctx
, &ctx
->DefaultPacking
.BufferObj
, NULL
);
1366 _mesa_reference_buffer_object(ctx
, &ctx
->Array
.ArrayBufferObj
, NULL
);
1368 /* free dispatch tables */
1369 free(ctx
->BeginEnd
);
1370 free(ctx
->OutsideBeginEnd
);
1372 free(ctx
->ContextLost
);
1373 free(ctx
->MarshalExec
);
1375 /* Shared context state (display lists, textures, etc) */
1376 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, NULL
);
1378 /* needs to be after freeing shared state */
1379 _mesa_free_display_list_data(ctx
);
1381 _mesa_free_errors_data(ctx
);
1383 free((void *)ctx
->Extensions
.String
);
1385 free(ctx
->VersionString
);
1387 /* unbind the context if it's currently bound */
1388 if (ctx
== _mesa_get_current_context()) {
1389 _mesa_make_current(NULL
, NULL
, NULL
);
1395 * Destroy a struct gl_context structure.
1397 * \param ctx GL context.
1399 * Calls _mesa_free_context_data() and frees the gl_context object itself.
1402 _mesa_destroy_context( struct gl_context
*ctx
)
1405 _mesa_free_context_data(ctx
);
1406 free( (void *) ctx
);
1412 * Copy attribute groups from one context to another.
1414 * \param src source context
1415 * \param dst destination context
1416 * \param mask bitwise OR of GL_*_BIT flags
1418 * According to the bits specified in \p mask, copies the corresponding
1419 * attributes from \p src into \p dst. For many of the attributes a simple \c
1420 * memcpy is not enough due to the existence of internal pointers in their data
1424 _mesa_copy_context( const struct gl_context
*src
, struct gl_context
*dst
,
1427 if (mask
& GL_ACCUM_BUFFER_BIT
) {
1429 dst
->Accum
= src
->Accum
;
1431 if (mask
& GL_COLOR_BUFFER_BIT
) {
1433 dst
->Color
= src
->Color
;
1435 if (mask
& GL_CURRENT_BIT
) {
1437 dst
->Current
= src
->Current
;
1439 if (mask
& GL_DEPTH_BUFFER_BIT
) {
1441 dst
->Depth
= src
->Depth
;
1443 if (mask
& GL_ENABLE_BIT
) {
1446 if (mask
& GL_EVAL_BIT
) {
1448 dst
->Eval
= src
->Eval
;
1450 if (mask
& GL_FOG_BIT
) {
1452 dst
->Fog
= src
->Fog
;
1454 if (mask
& GL_HINT_BIT
) {
1456 dst
->Hint
= src
->Hint
;
1458 if (mask
& GL_LIGHTING_BIT
) {
1460 dst
->Light
= src
->Light
;
1462 if (mask
& GL_LINE_BIT
) {
1464 dst
->Line
= src
->Line
;
1466 if (mask
& GL_LIST_BIT
) {
1468 dst
->List
= src
->List
;
1470 if (mask
& GL_PIXEL_MODE_BIT
) {
1472 dst
->Pixel
= src
->Pixel
;
1474 if (mask
& GL_POINT_BIT
) {
1476 dst
->Point
= src
->Point
;
1478 if (mask
& GL_POLYGON_BIT
) {
1480 dst
->Polygon
= src
->Polygon
;
1482 if (mask
& GL_POLYGON_STIPPLE_BIT
) {
1483 /* Use loop instead of memcpy due to problem with Portland Group's
1484 * C compiler. Reported by John Stone.
1487 for (i
= 0; i
< 32; i
++) {
1488 dst
->PolygonStipple
[i
] = src
->PolygonStipple
[i
];
1491 if (mask
& GL_SCISSOR_BIT
) {
1493 dst
->Scissor
= src
->Scissor
;
1495 if (mask
& GL_STENCIL_BUFFER_BIT
) {
1497 dst
->Stencil
= src
->Stencil
;
1499 if (mask
& GL_TEXTURE_BIT
) {
1500 /* Cannot memcpy because of pointers */
1501 _mesa_copy_texture_state(src
, dst
);
1503 if (mask
& GL_TRANSFORM_BIT
) {
1505 dst
->Transform
= src
->Transform
;
1507 if (mask
& GL_VIEWPORT_BIT
) {
1509 for (i
= 0; i
< src
->Const
.MaxViewports
; i
++) {
1511 dst
->ViewportArray
[i
] = src
->ViewportArray
[i
];
1515 /* XXX FIXME: Call callbacks?
1517 dst
->NewState
= _NEW_ALL
;
1518 dst
->NewDriverState
= ~0;
1523 * Check if the given context can render into the given framebuffer
1524 * by checking visual attributes.
1526 * \return GL_TRUE if compatible, GL_FALSE otherwise.
1529 check_compatible(const struct gl_context
*ctx
,
1530 const struct gl_framebuffer
*buffer
)
1532 const struct gl_config
*ctxvis
= &ctx
->Visual
;
1533 const struct gl_config
*bufvis
= &buffer
->Visual
;
1535 if (buffer
== _mesa_get_incomplete_framebuffer())
1538 #define check_component(foo) \
1539 if (ctxvis->foo && bufvis->foo && \
1540 ctxvis->foo != bufvis->foo) \
1543 check_component(redMask
);
1544 check_component(greenMask
);
1545 check_component(blueMask
);
1546 check_component(depthBits
);
1547 check_component(stencilBits
);
1549 #undef check_component
1556 * Check if the viewport/scissor size has not yet been initialized.
1557 * Initialize the size if the given width and height are non-zero.
1560 check_init_viewport(struct gl_context
*ctx
, GLuint width
, GLuint height
)
1562 if (!ctx
->ViewportInitialized
&& width
> 0 && height
> 0) {
1565 /* Note: set flag here, before calling _mesa_set_viewport(), to prevent
1566 * potential infinite recursion.
1568 ctx
->ViewportInitialized
= GL_TRUE
;
1570 /* Note: ctx->Const.MaxViewports may not have been set by the driver
1571 * yet, so just initialize all of them.
1573 for (i
= 0; i
< MAX_VIEWPORTS
; i
++) {
1574 _mesa_set_viewport(ctx
, i
, 0, 0, width
, height
);
1575 _mesa_set_scissor(ctx
, i
, 0, 0, width
, height
);
1582 handle_first_current(struct gl_context
*ctx
)
1584 if (ctx
->Version
== 0 || !ctx
->DrawBuffer
) {
1585 /* probably in the process of tearing down the context */
1589 check_context_limits(ctx
);
1591 _mesa_update_vertex_processing_mode(ctx
);
1593 /* According to GL_MESA_configless_context the default value of
1594 * glDrawBuffers depends on the config of the first surface it is bound to.
1595 * For GLES it is always GL_BACK which has a magic interpretation.
1597 if (!ctx
->HasConfig
&& _mesa_is_desktop_gl(ctx
)) {
1598 if (ctx
->DrawBuffer
!= _mesa_get_incomplete_framebuffer()) {
1601 if (ctx
->DrawBuffer
->Visual
.doubleBufferMode
)
1606 _mesa_drawbuffers(ctx
, ctx
->DrawBuffer
, 1, &buffer
,
1607 NULL
/* destMask */);
1610 if (ctx
->ReadBuffer
!= _mesa_get_incomplete_framebuffer()) {
1611 gl_buffer_index bufferIndex
;
1614 if (ctx
->ReadBuffer
->Visual
.doubleBufferMode
) {
1616 bufferIndex
= BUFFER_BACK_LEFT
;
1620 bufferIndex
= BUFFER_FRONT_LEFT
;
1623 _mesa_readbuffer(ctx
, ctx
->ReadBuffer
, buffer
, bufferIndex
);
1627 /* Determine if generic vertex attribute 0 aliases the conventional
1628 * glVertex position.
1631 const bool is_forward_compatible_context
=
1632 ctx
->Const
.ContextFlags
& GL_CONTEXT_FLAG_FORWARD_COMPATIBLE_BIT
;
1634 /* In OpenGL 3.1 attribute 0 becomes non-magic, just like in OpenGL ES
1635 * 2.0. Note that we cannot just check for API_OPENGL_COMPAT here because
1636 * that will erroneously allow this usage in a 3.0 forward-compatible
1639 ctx
->_AttribZeroAliasesVertex
= (ctx
->API
== API_OPENGLES
1640 || (ctx
->API
== API_OPENGL_COMPAT
1641 && !is_forward_compatible_context
));
1644 /* We can use this to help debug user's problems. Tell them to set
1645 * the MESA_INFO env variable before running their app. Then the
1646 * first time each context is made current we'll print some useful
1649 if (getenv("MESA_INFO")) {
1650 _mesa_print_info(ctx
);
1655 * Bind the given context to the given drawBuffer and readBuffer and
1656 * make it the current context for the calling thread.
1657 * We'll render into the drawBuffer and read pixels from the
1658 * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1660 * We check that the context's and framebuffer's visuals are compatible
1661 * and return immediately if they're not.
1663 * \param newCtx the new GL context. If NULL then there will be no current GL
1665 * \param drawBuffer the drawing framebuffer
1666 * \param readBuffer the reading framebuffer
1669 _mesa_make_current( struct gl_context
*newCtx
,
1670 struct gl_framebuffer
*drawBuffer
,
1671 struct gl_framebuffer
*readBuffer
)
1673 GET_CURRENT_CONTEXT(curCtx
);
1675 if (MESA_VERBOSE
& VERBOSE_API
)
1676 _mesa_debug(newCtx
, "_mesa_make_current()\n");
1678 /* Check that the context's and framebuffer's visuals are compatible.
1680 if (newCtx
&& drawBuffer
&& newCtx
->WinSysDrawBuffer
!= drawBuffer
) {
1681 if (!check_compatible(newCtx
, drawBuffer
)) {
1682 _mesa_warning(newCtx
,
1683 "MakeCurrent: incompatible visuals for context and drawbuffer");
1687 if (newCtx
&& readBuffer
&& newCtx
->WinSysReadBuffer
!= readBuffer
) {
1688 if (!check_compatible(newCtx
, readBuffer
)) {
1689 _mesa_warning(newCtx
,
1690 "MakeCurrent: incompatible visuals for context and readbuffer");
1696 (curCtx
->WinSysDrawBuffer
|| curCtx
->WinSysReadBuffer
) &&
1697 /* make sure this context is valid for flushing */
1699 curCtx
->Const
.ContextReleaseBehavior
==
1700 GL_CONTEXT_RELEASE_BEHAVIOR_FLUSH
) {
1701 _mesa_flush(curCtx
);
1704 /* We used to call _glapi_check_multithread() here. Now do it in drivers */
1707 _glapi_set_dispatch(NULL
); /* none current */
1708 /* We need old ctx to correctly release Draw/ReadBuffer
1709 * and avoid a surface leak in st_renderbuffer_delete.
1710 * Therefore, first drop buffers then set new ctx to NULL.
1713 _mesa_reference_framebuffer(&curCtx
->WinSysDrawBuffer
, NULL
);
1714 _mesa_reference_framebuffer(&curCtx
->WinSysReadBuffer
, NULL
);
1716 _glapi_set_context(NULL
);
1717 assert(_mesa_get_current_context() == NULL
);
1720 _glapi_set_context((void *) newCtx
);
1721 assert(_mesa_get_current_context() == newCtx
);
1722 _glapi_set_dispatch(newCtx
->CurrentClientDispatch
);
1724 if (drawBuffer
&& readBuffer
) {
1725 assert(_mesa_is_winsys_fbo(drawBuffer
));
1726 assert(_mesa_is_winsys_fbo(readBuffer
));
1727 _mesa_reference_framebuffer(&newCtx
->WinSysDrawBuffer
, drawBuffer
);
1728 _mesa_reference_framebuffer(&newCtx
->WinSysReadBuffer
, readBuffer
);
1731 * Only set the context's Draw/ReadBuffer fields if they're NULL
1732 * or not bound to a user-created FBO.
1734 if (!newCtx
->DrawBuffer
|| _mesa_is_winsys_fbo(newCtx
->DrawBuffer
)) {
1735 _mesa_reference_framebuffer(&newCtx
->DrawBuffer
, drawBuffer
);
1736 /* Update the FBO's list of drawbuffers/renderbuffers.
1737 * For winsys FBOs this comes from the GL state (which may have
1738 * changed since the last time this FBO was bound).
1740 _mesa_update_draw_buffers(newCtx
);
1742 if (!newCtx
->ReadBuffer
|| _mesa_is_winsys_fbo(newCtx
->ReadBuffer
)) {
1743 _mesa_reference_framebuffer(&newCtx
->ReadBuffer
, readBuffer
);
1744 /* In _mesa_initialize_window_framebuffer, for single-buffered
1745 * visuals, the ColorReadBuffer is set to be GL_FRONT, even with
1746 * GLES contexts. When calling read_buffer, we verify we are reading
1747 * from GL_BACK in is_legal_es3_readbuffer_enum. But the default is
1748 * incorrect, and certain dEQP tests check this. So fix it here.
1750 if (_mesa_is_gles(newCtx
) &&
1751 !newCtx
->ReadBuffer
->Visual
.doubleBufferMode
)
1752 if (newCtx
->ReadBuffer
->ColorReadBuffer
== GL_FRONT
)
1753 newCtx
->ReadBuffer
->ColorReadBuffer
= GL_BACK
;
1756 /* XXX only set this flag if we're really changing the draw/read
1757 * framebuffer bindings.
1759 newCtx
->NewState
|= _NEW_BUFFERS
;
1761 check_init_viewport(newCtx
, drawBuffer
->Width
, drawBuffer
->Height
);
1764 if (newCtx
->FirstTimeCurrent
) {
1765 handle_first_current(newCtx
);
1766 newCtx
->FirstTimeCurrent
= GL_FALSE
;
1775 * Make context 'ctx' share the display lists, textures and programs
1776 * that are associated with 'ctxToShare'.
1777 * Any display lists, textures or programs associated with 'ctx' will
1778 * be deleted if nobody else is sharing them.
1781 _mesa_share_state(struct gl_context
*ctx
, struct gl_context
*ctxToShare
)
1783 if (ctx
&& ctxToShare
&& ctx
->Shared
&& ctxToShare
->Shared
) {
1784 struct gl_shared_state
*oldShared
= NULL
;
1786 /* save ref to old state to prevent it from being deleted immediately */
1787 _mesa_reference_shared_state(ctx
, &oldShared
, ctx
->Shared
);
1789 /* update ctx's Shared pointer */
1790 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, ctxToShare
->Shared
);
1792 update_default_objects(ctx
);
1794 /* release the old shared state */
1795 _mesa_reference_shared_state(ctx
, &oldShared
, NULL
);
1807 * \return pointer to the current GL context for this thread.
1809 * Calls _glapi_get_context(). This isn't the fastest way to get the current
1810 * context. If you need speed, see the #GET_CURRENT_CONTEXT macro in
1814 _mesa_get_current_context( void )
1816 return (struct gl_context
*) _glapi_get_context();
1821 * Get context's current API dispatch table.
1823 * It'll either be the immediate-mode execute dispatcher, the display list
1824 * compile dispatcher, or the thread marshalling dispatcher.
1826 * \param ctx GL context.
1828 * \return pointer to dispatch_table.
1830 * Simply returns __struct gl_contextRec::CurrentClientDispatch.
1832 struct _glapi_table
*
1833 _mesa_get_dispatch(struct gl_context
*ctx
)
1835 return ctx
->CurrentClientDispatch
;
1841 /**********************************************************************/
1842 /** \name Miscellaneous functions */
1843 /**********************************************************************/
1849 _mesa_flush(struct gl_context
*ctx
)
1851 FLUSH_VERTICES( ctx
, 0 );
1852 FLUSH_CURRENT( ctx
, 0 );
1853 if (ctx
->Driver
.Flush
) {
1854 ctx
->Driver
.Flush(ctx
);
1861 * Flush commands and wait for completion.
1863 * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1864 * dd_function_table::Finish driver callback, if not NULL.
1869 GET_CURRENT_CONTEXT(ctx
);
1870 ASSERT_OUTSIDE_BEGIN_END(ctx
);
1872 FLUSH_VERTICES(ctx
, 0);
1873 FLUSH_CURRENT(ctx
, 0);
1875 if (ctx
->Driver
.Finish
) {
1876 ctx
->Driver
.Finish(ctx
);
1882 * Execute glFlush().
1884 * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1885 * dd_function_table::Flush driver callback, if not NULL.
1890 GET_CURRENT_CONTEXT(ctx
);
1891 ASSERT_OUTSIDE_BEGIN_END(ctx
);