2 * Mesa 3-D graphics library
5 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
6 * Copyright (C) 2008 VMware, Inc. All Rights Reserved.
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR 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.
80 #include "mfeatures.h"
88 #include "bufferobj.h"
95 #include "extensions.h"
100 #include "framebuffer.h"
107 #include "multisample.h"
109 #include "pixelstore.h"
112 #include "queryobj.h"
118 #include "shaderobj.h"
119 #include "simple_list.h"
122 #include "texcompress_s3tc.h"
123 #include "texstate.h"
124 #include "transformfeedback.h"
128 #include "viewport.h"
130 #include "program/program.h"
131 #include "program/prog_print.h"
133 #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_attrib fa
= FRAG_ATTRIB_WPOS
;
349 gl_frag_result fr
= FRAG_RESULT_DEPTH
;
350 gl_texture_index ti
= TEXTURE_2D_ARRAY_INDEX
;
351 gl_vert_attrib va
= VERT_ATTRIB_POS
;
352 gl_vert_result vr
= VERT_RESULT_HPOS
;
353 gl_geom_attrib ga
= GEOM_ATTRIB_POSITION
;
354 gl_geom_result gr
= GEOM_RESULT_POS
;
369 * One-time initialization mutex lock.
371 * \sa Used by one_time_init().
373 _glthread_DECLARE_STATIC_MUTEX(OneTimeLock
);
378 * Calls all the various one-time-init functions in Mesa.
380 * While holding a global mutex lock, calls several initialization functions,
381 * and sets the glapi callbacks if the \c MESA_DEBUG environment variable is
387 one_time_init( struct gl_context
*ctx
)
389 static GLbitfield api_init_mask
= 0x0;
391 _glthread_LOCK_MUTEX(OneTimeLock
);
393 /* truly one-time init */
394 if (!api_init_mask
) {
397 /* do some implementation tests */
398 assert( sizeof(GLbyte
) == 1 );
399 assert( sizeof(GLubyte
) == 1 );
400 assert( sizeof(GLshort
) == 2 );
401 assert( sizeof(GLushort
) == 2 );
402 assert( sizeof(GLint
) == 4 );
403 assert( sizeof(GLuint
) == 4 );
405 _mesa_get_cpu_features();
407 _mesa_init_sqrt_table();
409 /* context dependence is never a one-time thing... */
410 _mesa_init_get_hash(ctx
);
412 for (i
= 0; i
< 256; i
++) {
413 _mesa_ubyte_to_float_color_tab
[i
] = (float) i
/ 255.0F
;
416 #if defined(DEBUG) && defined(__DATE__) && defined(__TIME__)
417 if (MESA_VERBOSE
!= 0) {
418 _mesa_debug(ctx
, "Mesa %s DEBUG build %s %s\n",
419 MESA_VERSION_STRING
, __DATE__
, __TIME__
);
424 _mesa_test_formats();
428 /* per-API one-time init */
429 if (!(api_init_mask
& (1 << ctx
->API
))) {
431 * This is fine as ES does not use the remap table, but it may not be
432 * future-proof. We cannot always initialize the remap table because
433 * when an app is linked to libGLES*, there are not enough dynamic
436 if (ctx
->API
== API_OPENGL
)
437 _mesa_init_remap_table();
440 api_init_mask
|= 1 << ctx
->API
;
442 _glthread_UNLOCK_MUTEX(OneTimeLock
);
444 /* Hopefully atexit() is widely available. If not, we may need some
447 atexit(_mesa_destroy_shader_compiler
);
454 * Initialize fields of gl_current_attrib (aka ctx->Current.*)
457 _mesa_init_current(struct gl_context
*ctx
)
461 /* Init all to (0,0,0,1) */
462 for (i
= 0; i
< Elements(ctx
->Current
.Attrib
); i
++) {
463 ASSIGN_4V( ctx
->Current
.Attrib
[i
], 0.0, 0.0, 0.0, 1.0 );
466 /* redo special cases: */
467 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_WEIGHT
], 1.0, 0.0, 0.0, 0.0 );
468 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_NORMAL
], 0.0, 0.0, 1.0, 1.0 );
469 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_COLOR0
], 1.0, 1.0, 1.0, 1.0 );
470 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_COLOR1
], 0.0, 0.0, 0.0, 1.0 );
471 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_COLOR_INDEX
], 1.0, 0.0, 0.0, 1.0 );
472 ASSIGN_4V( ctx
->Current
.Attrib
[VERT_ATTRIB_EDGEFLAG
], 1.0, 0.0, 0.0, 1.0 );
477 * Init vertex/fragment/geometry program limits.
478 * Important: drivers should override these with actual limits.
481 init_program_limits(GLenum type
, struct gl_program_constants
*prog
)
483 prog
->MaxInstructions
= MAX_PROGRAM_INSTRUCTIONS
;
484 prog
->MaxAluInstructions
= MAX_PROGRAM_INSTRUCTIONS
;
485 prog
->MaxTexInstructions
= MAX_PROGRAM_INSTRUCTIONS
;
486 prog
->MaxTexIndirections
= MAX_PROGRAM_INSTRUCTIONS
;
487 prog
->MaxTemps
= MAX_PROGRAM_TEMPS
;
488 prog
->MaxEnvParams
= MAX_PROGRAM_ENV_PARAMS
;
489 prog
->MaxLocalParams
= MAX_PROGRAM_LOCAL_PARAMS
;
490 prog
->MaxAddressOffset
= MAX_PROGRAM_LOCAL_PARAMS
;
493 case GL_VERTEX_PROGRAM_ARB
:
494 prog
->MaxParameters
= MAX_VERTEX_PROGRAM_PARAMS
;
495 prog
->MaxAttribs
= MAX_NV_VERTEX_PROGRAM_INPUTS
;
496 prog
->MaxAddressRegs
= MAX_VERTEX_PROGRAM_ADDRESS_REGS
;
497 prog
->MaxUniformComponents
= 4 * MAX_UNIFORMS
;
499 case GL_FRAGMENT_PROGRAM_ARB
:
500 prog
->MaxParameters
= MAX_NV_FRAGMENT_PROGRAM_PARAMS
;
501 prog
->MaxAttribs
= MAX_NV_FRAGMENT_PROGRAM_INPUTS
;
502 prog
->MaxAddressRegs
= MAX_FRAGMENT_PROGRAM_ADDRESS_REGS
;
503 prog
->MaxUniformComponents
= 4 * MAX_UNIFORMS
;
505 case MESA_GEOMETRY_PROGRAM
:
506 prog
->MaxParameters
= MAX_NV_VERTEX_PROGRAM_PARAMS
;
507 prog
->MaxAttribs
= MAX_NV_VERTEX_PROGRAM_INPUTS
;
508 prog
->MaxAddressRegs
= MAX_VERTEX_PROGRAM_ADDRESS_REGS
;
509 prog
->MaxUniformComponents
= MAX_GEOMETRY_UNIFORM_COMPONENTS
;
512 assert(0 && "Bad program type in init_program_limits()");
515 /* Set the native limits to zero. This implies that there is no native
516 * support for shaders. Let the drivers fill in the actual values.
518 prog
->MaxNativeInstructions
= 0;
519 prog
->MaxNativeAluInstructions
= 0;
520 prog
->MaxNativeTexInstructions
= 0;
521 prog
->MaxNativeTexIndirections
= 0;
522 prog
->MaxNativeAttribs
= 0;
523 prog
->MaxNativeTemps
= 0;
524 prog
->MaxNativeAddressRegs
= 0;
525 prog
->MaxNativeParameters
= 0;
527 /* Set GLSL datatype range/precision info assuming IEEE float values.
528 * Drivers should override these defaults as needed.
530 prog
->MediumFloat
.RangeMin
= 127;
531 prog
->MediumFloat
.RangeMax
= 127;
532 prog
->MediumFloat
.Precision
= 23;
533 prog
->LowFloat
= prog
->HighFloat
= prog
->MediumFloat
;
535 /* Assume ints are stored as floats for now, since this is the least-common
536 * denominator. The OpenGL ES spec implies (page 132) that the precision
537 * of integer types should be 0. Practically speaking, IEEE
538 * single-precision floating point values can only store integers in the
539 * range [-0x01000000, 0x01000000] without loss of precision.
541 prog
->MediumInt
.RangeMin
= 24;
542 prog
->MediumInt
.RangeMax
= 24;
543 prog
->MediumInt
.Precision
= 0;
544 prog
->LowInt
= prog
->HighInt
= prog
->MediumInt
;
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_context
*ctx
)
558 /* Constants, may be overriden (usually only reduced) by device drivers */
559 ctx
->Const
.MaxTextureMbytes
= MAX_TEXTURE_MBYTES
;
560 ctx
->Const
.MaxTextureLevels
= MAX_TEXTURE_LEVELS
;
561 ctx
->Const
.Max3DTextureLevels
= MAX_3D_TEXTURE_LEVELS
;
562 ctx
->Const
.MaxCubeTextureLevels
= MAX_CUBE_TEXTURE_LEVELS
;
563 ctx
->Const
.MaxTextureRectSize
= MAX_TEXTURE_RECT_SIZE
;
564 ctx
->Const
.MaxArrayTextureLayers
= MAX_ARRAY_TEXTURE_LAYERS
;
565 ctx
->Const
.MaxTextureCoordUnits
= MAX_TEXTURE_COORD_UNITS
;
566 ctx
->Const
.MaxTextureImageUnits
= MAX_TEXTURE_IMAGE_UNITS
;
567 ctx
->Const
.MaxTextureUnits
= MIN2(ctx
->Const
.MaxTextureCoordUnits
,
568 ctx
->Const
.MaxTextureImageUnits
);
569 ctx
->Const
.MaxTextureMaxAnisotropy
= MAX_TEXTURE_MAX_ANISOTROPY
;
570 ctx
->Const
.MaxTextureLodBias
= MAX_TEXTURE_LOD_BIAS
;
571 ctx
->Const
.MaxTextureBufferSize
= 65536;
572 ctx
->Const
.MaxArrayLockSize
= MAX_ARRAY_LOCK_SIZE
;
573 ctx
->Const
.SubPixelBits
= SUB_PIXEL_BITS
;
574 ctx
->Const
.MinPointSize
= MIN_POINT_SIZE
;
575 ctx
->Const
.MaxPointSize
= MAX_POINT_SIZE
;
576 ctx
->Const
.MinPointSizeAA
= MIN_POINT_SIZE
;
577 ctx
->Const
.MaxPointSizeAA
= MAX_POINT_SIZE
;
578 ctx
->Const
.PointSizeGranularity
= (GLfloat
) POINT_SIZE_GRANULARITY
;
579 ctx
->Const
.MinLineWidth
= MIN_LINE_WIDTH
;
580 ctx
->Const
.MaxLineWidth
= MAX_LINE_WIDTH
;
581 ctx
->Const
.MinLineWidthAA
= MIN_LINE_WIDTH
;
582 ctx
->Const
.MaxLineWidthAA
= MAX_LINE_WIDTH
;
583 ctx
->Const
.LineWidthGranularity
= (GLfloat
) LINE_WIDTH_GRANULARITY
;
584 ctx
->Const
.MaxColorTableSize
= MAX_COLOR_TABLE_SIZE
;
585 ctx
->Const
.MaxClipPlanes
= 6;
586 ctx
->Const
.MaxLights
= MAX_LIGHTS
;
587 ctx
->Const
.MaxShininess
= 128.0;
588 ctx
->Const
.MaxSpotExponent
= 128.0;
589 ctx
->Const
.MaxViewportWidth
= MAX_VIEWPORT_WIDTH
;
590 ctx
->Const
.MaxViewportHeight
= MAX_VIEWPORT_HEIGHT
;
591 #if FEATURE_ARB_vertex_program
592 init_program_limits(GL_VERTEX_PROGRAM_ARB
, &ctx
->Const
.VertexProgram
);
594 #if FEATURE_ARB_fragment_program
595 init_program_limits(GL_FRAGMENT_PROGRAM_ARB
, &ctx
->Const
.FragmentProgram
);
597 #if FEATURE_ARB_geometry_shader4
598 init_program_limits(MESA_GEOMETRY_PROGRAM
, &ctx
->Const
.GeometryProgram
);
600 ctx
->Const
.MaxProgramMatrices
= MAX_PROGRAM_MATRICES
;
601 ctx
->Const
.MaxProgramMatrixStackDepth
= MAX_PROGRAM_MATRIX_STACK_DEPTH
;
603 /* CheckArrayBounds is overriden by drivers/x11 for X server */
604 ctx
->Const
.CheckArrayBounds
= GL_FALSE
;
606 /* GL_ARB_draw_buffers */
607 ctx
->Const
.MaxDrawBuffers
= MAX_DRAW_BUFFERS
;
609 #if FEATURE_EXT_framebuffer_object
610 ctx
->Const
.MaxColorAttachments
= MAX_COLOR_ATTACHMENTS
;
611 ctx
->Const
.MaxRenderbufferSize
= MAX_RENDERBUFFER_SIZE
;
614 #if FEATURE_ARB_vertex_shader
615 ctx
->Const
.MaxVertexTextureImageUnits
= MAX_VERTEX_TEXTURE_IMAGE_UNITS
;
616 ctx
->Const
.MaxCombinedTextureImageUnits
= MAX_COMBINED_TEXTURE_IMAGE_UNITS
;
617 ctx
->Const
.MaxVarying
= MAX_VARYING
;
619 #if FEATURE_ARB_geometry_shader4
620 ctx
->Const
.MaxGeometryTextureImageUnits
= MAX_GEOMETRY_TEXTURE_IMAGE_UNITS
;
621 ctx
->Const
.MaxVertexVaryingComponents
= MAX_VERTEX_VARYING_COMPONENTS
;
622 ctx
->Const
.MaxGeometryVaryingComponents
= MAX_GEOMETRY_VARYING_COMPONENTS
;
623 ctx
->Const
.MaxGeometryOutputVertices
= MAX_GEOMETRY_OUTPUT_VERTICES
;
624 ctx
->Const
.MaxGeometryTotalOutputComponents
= MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS
;
627 /* Shading language version */
628 if (ctx
->API
== API_OPENGL
) {
629 ctx
->Const
.GLSLVersion
= 120;
630 _mesa_override_glsl_version(ctx
);
632 else if (ctx
->API
== API_OPENGLES2
) {
633 ctx
->Const
.GLSLVersion
= 100;
635 else if (ctx
->API
== API_OPENGLES
) {
636 ctx
->Const
.GLSLVersion
= 0; /* GLSL not supported */
639 /* GL_ARB_framebuffer_object */
640 ctx
->Const
.MaxSamples
= 0;
643 ctx
->Const
.MaxServerWaitTimeout
= (GLuint64
) ~0;
645 /* GL_ATI_envmap_bumpmap */
646 ctx
->Const
.SupportedBumpUnits
= SUPPORTED_ATI_BUMP_UNITS
;
648 /* GL_EXT_provoking_vertex */
649 ctx
->Const
.QuadsFollowProvokingVertexConvention
= GL_TRUE
;
651 /* GL_EXT_transform_feedback */
652 ctx
->Const
.MaxTransformFeedbackSeparateAttribs
= MAX_FEEDBACK_ATTRIBS
;
653 ctx
->Const
.MaxTransformFeedbackSeparateComponents
= 4 * MAX_FEEDBACK_ATTRIBS
;
654 ctx
->Const
.MaxTransformFeedbackInterleavedComponents
= 4 * MAX_FEEDBACK_ATTRIBS
;
656 /* GL 3.2: hard-coded for now: */
657 ctx
->Const
.ProfileMask
= GL_CONTEXT_COMPATIBILITY_PROFILE_BIT
;
659 /** GL_EXT_gpu_shader4 */
660 ctx
->Const
.MinProgramTexelOffset
= -8;
661 ctx
->Const
.MaxProgramTexelOffset
= 7;
663 /* GL_ARB_robustness */
664 ctx
->Const
.ResetStrategy
= GL_NO_RESET_NOTIFICATION_ARB
;
666 /* PrimitiveRestart */
667 ctx
->Const
.PrimitiveRestartInSoftware
= GL_FALSE
;
672 * Do some sanity checks on the limits/constants for the given context.
673 * Only called the first time a context is bound.
676 check_context_limits(struct gl_context
*ctx
)
678 /* check that we don't exceed the size of various bitfields */
679 assert(VERT_RESULT_MAX
<=
680 (8 * sizeof(ctx
->VertexProgram
._Current
->Base
.OutputsWritten
)));
681 assert(FRAG_ATTRIB_MAX
<=
682 (8 * sizeof(ctx
->FragmentProgram
._Current
->Base
.InputsRead
)));
684 assert(MAX_COMBINED_TEXTURE_IMAGE_UNITS
<= 8 * sizeof(GLbitfield
));
686 /* shader-related checks */
687 assert(ctx
->Const
.FragmentProgram
.MaxLocalParams
<= MAX_PROGRAM_LOCAL_PARAMS
);
688 assert(ctx
->Const
.VertexProgram
.MaxLocalParams
<= MAX_PROGRAM_LOCAL_PARAMS
);
690 assert(MAX_NV_FRAGMENT_PROGRAM_TEMPS
<= MAX_PROGRAM_TEMPS
);
691 assert(MAX_NV_VERTEX_PROGRAM_TEMPS
<= MAX_PROGRAM_TEMPS
);
692 assert(MAX_NV_VERTEX_PROGRAM_INPUTS
<= VERT_ATTRIB_MAX
);
693 assert(MAX_NV_VERTEX_PROGRAM_OUTPUTS
<= VERT_RESULT_MAX
);
695 /* Texture unit checks */
696 assert(ctx
->Const
.MaxTextureImageUnits
> 0);
697 assert(ctx
->Const
.MaxTextureImageUnits
<= MAX_TEXTURE_IMAGE_UNITS
);
698 assert(ctx
->Const
.MaxTextureCoordUnits
> 0);
699 assert(ctx
->Const
.MaxTextureCoordUnits
<= MAX_TEXTURE_COORD_UNITS
);
700 assert(ctx
->Const
.MaxTextureUnits
> 0);
701 assert(ctx
->Const
.MaxTextureUnits
<= MAX_TEXTURE_IMAGE_UNITS
);
702 assert(ctx
->Const
.MaxTextureUnits
<= MAX_TEXTURE_COORD_UNITS
);
703 assert(ctx
->Const
.MaxTextureUnits
== MIN2(ctx
->Const
.MaxTextureImageUnits
,
704 ctx
->Const
.MaxTextureCoordUnits
));
705 assert(ctx
->Const
.MaxCombinedTextureImageUnits
> 0);
706 assert(ctx
->Const
.MaxCombinedTextureImageUnits
<= MAX_COMBINED_TEXTURE_IMAGE_UNITS
);
707 assert(ctx
->Const
.MaxTextureCoordUnits
<= MAX_COMBINED_TEXTURE_IMAGE_UNITS
);
708 /* number of coord units cannot be greater than number of image units */
709 assert(ctx
->Const
.MaxTextureCoordUnits
<= ctx
->Const
.MaxTextureImageUnits
);
712 /* Texture size checks */
713 assert(ctx
->Const
.MaxTextureLevels
<= MAX_TEXTURE_LEVELS
);
714 assert(ctx
->Const
.Max3DTextureLevels
<= MAX_3D_TEXTURE_LEVELS
);
715 assert(ctx
->Const
.MaxCubeTextureLevels
<= MAX_CUBE_TEXTURE_LEVELS
);
716 assert(ctx
->Const
.MaxTextureRectSize
<= MAX_TEXTURE_RECT_SIZE
);
718 /* Texture level checks */
719 assert(MAX_TEXTURE_LEVELS
>= MAX_3D_TEXTURE_LEVELS
);
720 assert(MAX_TEXTURE_LEVELS
>= MAX_CUBE_TEXTURE_LEVELS
);
722 /* Max texture size should be <= max viewport size (render to texture) */
723 assert((1 << (ctx
->Const
.MaxTextureLevels
- 1))
724 <= ctx
->Const
.MaxViewportWidth
);
725 assert((1 << (ctx
->Const
.MaxTextureLevels
- 1))
726 <= ctx
->Const
.MaxViewportHeight
);
728 assert(ctx
->Const
.MaxDrawBuffers
<= MAX_DRAW_BUFFERS
);
730 /* if this fails, add more enum values to gl_buffer_index */
731 assert(BUFFER_COLOR0
+ MAX_DRAW_BUFFERS
<= BUFFER_COUNT
);
733 /* XXX probably add more tests */
738 * Initialize the attribute groups in a GL context.
740 * \param ctx GL context.
742 * Initializes all the attributes, calling the respective <tt>init*</tt>
743 * functions for the more complex data structures.
746 init_attrib_groups(struct gl_context
*ctx
)
751 _mesa_init_constants( ctx
);
754 _mesa_init_extensions( ctx
);
756 /* Attribute Groups */
757 _mesa_init_accum( ctx
);
758 _mesa_init_attrib( ctx
);
759 _mesa_init_buffer_objects( ctx
);
760 _mesa_init_color( ctx
);
761 _mesa_init_current( ctx
);
762 _mesa_init_depth( ctx
);
763 _mesa_init_debug( ctx
);
764 _mesa_init_display_list( ctx
);
765 _mesa_init_errors( ctx
);
766 _mesa_init_eval( ctx
);
767 _mesa_init_fbobjects( ctx
);
768 _mesa_init_feedback( ctx
);
769 _mesa_init_fog( ctx
);
770 _mesa_init_hint( ctx
);
771 _mesa_init_line( ctx
);
772 _mesa_init_lighting( ctx
);
773 _mesa_init_matrix( ctx
);
774 _mesa_init_multisample( ctx
);
775 _mesa_init_pixel( ctx
);
776 _mesa_init_pixelstore( ctx
);
777 _mesa_init_point( ctx
);
778 _mesa_init_polygon( ctx
);
779 _mesa_init_program( ctx
);
780 _mesa_init_queryobj( ctx
);
781 _mesa_init_sync( ctx
);
782 _mesa_init_rastpos( ctx
);
783 _mesa_init_scissor( ctx
);
784 _mesa_init_shader_state( ctx
);
785 _mesa_init_stencil( ctx
);
786 _mesa_init_transform( ctx
);
787 _mesa_init_transform_feedback( ctx
);
788 _mesa_init_varray( ctx
);
789 _mesa_init_viewport( ctx
);
791 if (!_mesa_init_texture( ctx
))
794 _mesa_init_texture_s3tc( ctx
);
797 ctx
->NewState
= _NEW_ALL
;
798 ctx
->NewDriverState
= ~0;
799 ctx
->ErrorValue
= (GLenum
) GL_NO_ERROR
;
800 ctx
->ResetStatus
= (GLenum
) GL_NO_ERROR
;
801 ctx
->varying_vp_inputs
= VERT_BIT_ALL
;
808 * Update default objects in a GL context with respect to shared state.
810 * \param ctx GL context.
812 * Removes references to old default objects, (texture objects, program
813 * objects, etc.) and changes to reference those from the current shared
817 update_default_objects(struct gl_context
*ctx
)
821 _mesa_update_default_objects_program(ctx
);
822 _mesa_update_default_objects_texture(ctx
);
823 _mesa_update_default_objects_buffer_objects(ctx
);
830 * This is the default function we plug into all dispatch table slots
831 * This helps prevents a segfault when someone calls a GL function without
832 * first checking if the extension's supported.
837 _mesa_warning(NULL
, "User called no-op dispatch function (an unsupported extension function?)");
843 * Allocate and initialize a new dispatch table.
845 struct _glapi_table
*
846 _mesa_alloc_dispatch_table(int size
)
848 /* Find the larger of Mesa's dispatch table and libGL's dispatch table.
849 * In practice, this'll be the same for stand-alone Mesa. But for DRI
850 * Mesa we do this to accomodate different versions of libGL and various
853 GLint numEntries
= MAX2(_glapi_get_dispatch_table_size(), _gloffset_COUNT
);
854 struct _glapi_table
*table
;
856 /* should never happen, but just in case */
857 numEntries
= MAX2(numEntries
, size
);
859 table
= (struct _glapi_table
*) malloc(numEntries
* sizeof(_glapi_proc
));
861 _glapi_proc
*entry
= (_glapi_proc
*) table
;
863 for (i
= 0; i
< numEntries
; i
++) {
864 entry
[i
] = (_glapi_proc
) generic_nop
;
872 * Initialize a struct gl_context struct (rendering context).
874 * This includes allocating all the other structs and arrays which hang off of
875 * the context by pointers.
876 * Note that the driver needs to pass in its dd_function_table here since
877 * we need to at least call driverFunctions->NewTextureObject to create the
878 * default texture objects.
880 * Called by _mesa_create_context().
882 * Performs the imports and exports callback tables initialization, and
883 * miscellaneous one-time initializations. If no shared context is supplied one
884 * is allocated, and increase its reference count. Setups the GL API dispatch
885 * tables. Initialize the TNL module. Sets the maximum Z buffer depth.
886 * Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
889 * \param ctx the context to initialize
890 * \param api the GL API type to create the context for
891 * \param visual describes the visual attributes for this context
892 * \param share_list points to context to share textures, display lists,
894 * \param driverFunctions table of device driver functions for this context
896 * \param driverContext pointer to driver-specific context data
899 _mesa_initialize_context(struct gl_context
*ctx
,
901 const struct gl_config
*visual
,
902 struct gl_context
*share_list
,
903 const struct dd_function_table
*driverFunctions
,
906 struct gl_shared_state
*shared
;
909 /*ASSERT(driverContext);*/
910 assert(driverFunctions
->NewTextureObject
);
911 assert(driverFunctions
->FreeTextureImageBuffer
);
914 ctx
->Visual
= *visual
;
915 ctx
->DrawBuffer
= NULL
;
916 ctx
->ReadBuffer
= NULL
;
917 ctx
->WinSysDrawBuffer
= NULL
;
918 ctx
->WinSysReadBuffer
= NULL
;
920 /* misc one-time initializations */
923 /* Plug in driver functions and context pointer here.
924 * This is important because when we call alloc_shared_state() below
925 * we'll call ctx->Driver.NewTextureObject() to create the default
928 ctx
->Driver
= *driverFunctions
;
929 ctx
->DriverCtx
= driverContext
;
932 /* share state with another context */
933 shared
= share_list
->Shared
;
936 /* allocate new, unshared state */
937 shared
= _mesa_alloc_shared_state(ctx
);
942 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, shared
);
944 if (!init_attrib_groups( ctx
)) {
945 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, NULL
);
950 /* setup the API dispatch tables */
954 ctx
->Exec
= _mesa_create_exec_table();
959 ctx
->Exec
= _mesa_create_exec_table_es1();
964 ctx
->Exec
= _mesa_create_exec_table_es2();
968 _mesa_problem(ctx
, "unknown or unsupported API");
973 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, NULL
);
977 ctx
->CurrentDispatch
= ctx
->Exec
;
979 ctx
->FragmentProgram
._MaintainTexEnvProgram
980 = (_mesa_getenv("MESA_TEX_PROG") != NULL
);
982 ctx
->VertexProgram
._MaintainTnlProgram
983 = (_mesa_getenv("MESA_TNL_PROG") != NULL
);
984 if (ctx
->VertexProgram
._MaintainTnlProgram
) {
985 /* this is required... */
986 ctx
->FragmentProgram
._MaintainTexEnvProgram
= GL_TRUE
;
989 /* Mesa core handles all the formats that mesa core knows about.
990 * Drivers will want to override this list with just the formats
991 * they can handle, and confirm that appropriate fallbacks exist in
992 * _mesa_choose_tex_format().
994 memset(&ctx
->TextureFormatSupported
, GL_TRUE
,
995 sizeof(ctx
->TextureFormatSupported
));
1000 ctx
->Save
= _mesa_create_save_table();
1002 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, NULL
);
1007 _mesa_install_save_vtxfmt( ctx
, &ctx
->ListState
.ListVtxfmt
);
1012 * GL_OES_texture_cube_map says
1013 * "Initially all texture generation modes are set to REFLECTION_MAP_OES"
1015 for (i
= 0; i
< MAX_TEXTURE_UNITS
; i
++) {
1016 struct gl_texture_unit
*texUnit
= &ctx
->Texture
.Unit
[i
];
1017 texUnit
->GenS
.Mode
= GL_REFLECTION_MAP_NV
;
1018 texUnit
->GenT
.Mode
= GL_REFLECTION_MAP_NV
;
1019 texUnit
->GenR
.Mode
= GL_REFLECTION_MAP_NV
;
1020 texUnit
->GenS
._ModeBit
= TEXGEN_REFLECTION_MAP_NV
;
1021 texUnit
->GenT
._ModeBit
= TEXGEN_REFLECTION_MAP_NV
;
1022 texUnit
->GenR
._ModeBit
= TEXGEN_REFLECTION_MAP_NV
;
1026 ctx
->FragmentProgram
._MaintainTexEnvProgram
= GL_TRUE
;
1027 ctx
->VertexProgram
._MaintainTnlProgram
= GL_TRUE
;
1028 ctx
->Point
.PointSprite
= GL_TRUE
; /* always on for ES 2.x */
1032 ctx
->FirstTimeCurrent
= GL_TRUE
;
1039 * Allocate and initialize a struct gl_context structure.
1040 * Note that the driver needs to pass in its dd_function_table here since
1041 * we need to at least call driverFunctions->NewTextureObject to initialize
1042 * the rendering context.
1044 * \param api the GL API type to create the context for
1045 * \param visual a struct gl_config pointer (we copy the struct contents)
1046 * \param share_list another context to share display lists with or NULL
1047 * \param driverFunctions points to the dd_function_table into which the
1048 * driver has plugged in all its special functions.
1049 * \param driverContext points to the device driver's private context state
1051 * \return pointer to a new __struct gl_contextRec or NULL if error.
1054 _mesa_create_context(gl_api api
,
1055 const struct gl_config
*visual
,
1056 struct gl_context
*share_list
,
1057 const struct dd_function_table
*driverFunctions
,
1058 void *driverContext
)
1060 struct gl_context
*ctx
;
1063 /*ASSERT(driverContext);*/
1065 ctx
= (struct gl_context
*) calloc(1, sizeof(struct gl_context
));
1069 if (_mesa_initialize_context(ctx
, api
, visual
, share_list
,
1070 driverFunctions
, driverContext
)) {
1081 * Free the data associated with the given context.
1083 * But doesn't free the struct gl_context struct itself.
1085 * \sa _mesa_initialize_context() and init_attrib_groups().
1088 _mesa_free_context_data( struct gl_context
*ctx
)
1090 if (!_mesa_get_current_context()){
1091 /* No current context, but we may need one in order to delete
1092 * texture objs, etc. So temporarily bind the context now.
1094 _mesa_make_current(ctx
, NULL
, NULL
);
1097 /* unreference WinSysDraw/Read buffers */
1098 _mesa_reference_framebuffer(&ctx
->WinSysDrawBuffer
, NULL
);
1099 _mesa_reference_framebuffer(&ctx
->WinSysReadBuffer
, NULL
);
1100 _mesa_reference_framebuffer(&ctx
->DrawBuffer
, NULL
);
1101 _mesa_reference_framebuffer(&ctx
->ReadBuffer
, NULL
);
1103 _mesa_reference_vertprog(ctx
, &ctx
->VertexProgram
.Current
, NULL
);
1104 _mesa_reference_vertprog(ctx
, &ctx
->VertexProgram
._Current
, NULL
);
1105 _mesa_reference_vertprog(ctx
, &ctx
->VertexProgram
._TnlProgram
, NULL
);
1107 _mesa_reference_fragprog(ctx
, &ctx
->FragmentProgram
.Current
, NULL
);
1108 _mesa_reference_fragprog(ctx
, &ctx
->FragmentProgram
._Current
, NULL
);
1109 _mesa_reference_fragprog(ctx
, &ctx
->FragmentProgram
._TexEnvProgram
, NULL
);
1111 _mesa_reference_array_object(ctx
, &ctx
->Array
.ArrayObj
, NULL
);
1112 _mesa_reference_array_object(ctx
, &ctx
->Array
.DefaultArrayObj
, NULL
);
1114 _mesa_free_attrib_data(ctx
);
1115 _mesa_free_buffer_objects(ctx
);
1116 _mesa_free_lighting_data( ctx
);
1117 _mesa_free_eval_data( ctx
);
1118 _mesa_free_texture_data( ctx
);
1119 _mesa_free_matrix_data( ctx
);
1120 _mesa_free_viewport_data( ctx
);
1121 _mesa_free_program_data(ctx
);
1122 _mesa_free_shader_state(ctx
);
1123 _mesa_free_queryobj_data(ctx
);
1124 _mesa_free_sync_data(ctx
);
1125 _mesa_free_varray_data(ctx
);
1126 _mesa_free_transform_feedback(ctx
);
1128 #if FEATURE_ARB_pixel_buffer_object
1129 _mesa_reference_buffer_object(ctx
, &ctx
->Pack
.BufferObj
, NULL
);
1130 _mesa_reference_buffer_object(ctx
, &ctx
->Unpack
.BufferObj
, NULL
);
1131 _mesa_reference_buffer_object(ctx
, &ctx
->DefaultPacking
.BufferObj
, NULL
);
1134 _mesa_reference_buffer_object(ctx
, &ctx
->Array
.ArrayBufferObj
, NULL
);
1136 /* free dispatch tables */
1140 /* Shared context state (display lists, textures, etc) */
1141 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, NULL
);
1143 /* needs to be after freeing shared state */
1144 _mesa_free_display_list_data(ctx
);
1146 _mesa_free_errors_data(ctx
);
1148 if (ctx
->Extensions
.String
)
1149 free((void *) ctx
->Extensions
.String
);
1151 if (ctx
->VersionString
)
1152 free(ctx
->VersionString
);
1154 /* unbind the context if it's currently bound */
1155 if (ctx
== _mesa_get_current_context()) {
1156 _mesa_make_current(NULL
, NULL
, NULL
);
1162 * Destroy a struct gl_context structure.
1164 * \param ctx GL context.
1166 * Calls _mesa_free_context_data() and frees the gl_context object itself.
1169 _mesa_destroy_context( struct gl_context
*ctx
)
1172 _mesa_free_context_data(ctx
);
1173 free( (void *) ctx
);
1180 * Copy attribute groups from one context to another.
1182 * \param src source context
1183 * \param dst destination context
1184 * \param mask bitwise OR of GL_*_BIT flags
1186 * According to the bits specified in \p mask, copies the corresponding
1187 * attributes from \p src into \p dst. For many of the attributes a simple \c
1188 * memcpy is not enough due to the existence of internal pointers in their data
1192 _mesa_copy_context( const struct gl_context
*src
, struct gl_context
*dst
,
1195 if (mask
& GL_ACCUM_BUFFER_BIT
) {
1197 dst
->Accum
= src
->Accum
;
1199 if (mask
& GL_COLOR_BUFFER_BIT
) {
1201 dst
->Color
= src
->Color
;
1203 if (mask
& GL_CURRENT_BIT
) {
1205 dst
->Current
= src
->Current
;
1207 if (mask
& GL_DEPTH_BUFFER_BIT
) {
1209 dst
->Depth
= src
->Depth
;
1211 if (mask
& GL_ENABLE_BIT
) {
1214 if (mask
& GL_EVAL_BIT
) {
1216 dst
->Eval
= src
->Eval
;
1218 if (mask
& GL_FOG_BIT
) {
1220 dst
->Fog
= src
->Fog
;
1222 if (mask
& GL_HINT_BIT
) {
1224 dst
->Hint
= src
->Hint
;
1226 if (mask
& GL_LIGHTING_BIT
) {
1228 /* begin with memcpy */
1229 dst
->Light
= src
->Light
;
1230 /* fixup linked lists to prevent pointer insanity */
1231 make_empty_list( &(dst
->Light
.EnabledList
) );
1232 for (i
= 0; i
< MAX_LIGHTS
; i
++) {
1233 if (dst
->Light
.Light
[i
].Enabled
) {
1234 insert_at_tail(&(dst
->Light
.EnabledList
), &(dst
->Light
.Light
[i
]));
1238 if (mask
& GL_LINE_BIT
) {
1240 dst
->Line
= src
->Line
;
1242 if (mask
& GL_LIST_BIT
) {
1244 dst
->List
= src
->List
;
1246 if (mask
& GL_PIXEL_MODE_BIT
) {
1248 dst
->Pixel
= src
->Pixel
;
1250 if (mask
& GL_POINT_BIT
) {
1252 dst
->Point
= src
->Point
;
1254 if (mask
& GL_POLYGON_BIT
) {
1256 dst
->Polygon
= src
->Polygon
;
1258 if (mask
& GL_POLYGON_STIPPLE_BIT
) {
1259 /* Use loop instead of memcpy due to problem with Portland Group's
1260 * C compiler. Reported by John Stone.
1263 for (i
= 0; i
< 32; i
++) {
1264 dst
->PolygonStipple
[i
] = src
->PolygonStipple
[i
];
1267 if (mask
& GL_SCISSOR_BIT
) {
1269 dst
->Scissor
= src
->Scissor
;
1271 if (mask
& GL_STENCIL_BUFFER_BIT
) {
1273 dst
->Stencil
= src
->Stencil
;
1275 if (mask
& GL_TEXTURE_BIT
) {
1276 /* Cannot memcpy because of pointers */
1277 _mesa_copy_texture_state(src
, dst
);
1279 if (mask
& GL_TRANSFORM_BIT
) {
1281 dst
->Transform
= src
->Transform
;
1283 if (mask
& GL_VIEWPORT_BIT
) {
1284 /* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
1285 dst
->Viewport
.X
= src
->Viewport
.X
;
1286 dst
->Viewport
.Y
= src
->Viewport
.Y
;
1287 dst
->Viewport
.Width
= src
->Viewport
.Width
;
1288 dst
->Viewport
.Height
= src
->Viewport
.Height
;
1289 dst
->Viewport
.Near
= src
->Viewport
.Near
;
1290 dst
->Viewport
.Far
= src
->Viewport
.Far
;
1291 _math_matrix_copy(&dst
->Viewport
._WindowMap
, &src
->Viewport
._WindowMap
);
1294 /* XXX FIXME: Call callbacks?
1296 dst
->NewState
= _NEW_ALL
;
1297 dst
->NewDriverState
= ~0;
1303 * Check if the given context can render into the given framebuffer
1304 * by checking visual attributes.
1306 * Most of these tests could go away because Mesa is now pretty flexible
1307 * in terms of mixing rendering contexts with framebuffers. As long
1308 * as RGB vs. CI mode agree, we're probably good.
1310 * \return GL_TRUE if compatible, GL_FALSE otherwise.
1313 check_compatible(const struct gl_context
*ctx
,
1314 const struct gl_framebuffer
*buffer
)
1316 const struct gl_config
*ctxvis
= &ctx
->Visual
;
1317 const struct gl_config
*bufvis
= &buffer
->Visual
;
1319 if (buffer
== _mesa_get_incomplete_framebuffer())
1323 /* disabling this fixes the fgl_glxgears pbuffer demo */
1324 if (ctxvis
->doubleBufferMode
&& !bufvis
->doubleBufferMode
)
1327 if (ctxvis
->stereoMode
&& !bufvis
->stereoMode
)
1329 if (ctxvis
->haveAccumBuffer
&& !bufvis
->haveAccumBuffer
)
1331 if (ctxvis
->haveDepthBuffer
&& !bufvis
->haveDepthBuffer
)
1333 if (ctxvis
->haveStencilBuffer
&& !bufvis
->haveStencilBuffer
)
1335 if (ctxvis
->redMask
&& ctxvis
->redMask
!= bufvis
->redMask
)
1337 if (ctxvis
->greenMask
&& ctxvis
->greenMask
!= bufvis
->greenMask
)
1339 if (ctxvis
->blueMask
&& ctxvis
->blueMask
!= bufvis
->blueMask
)
1342 /* disabled (see bug 11161) */
1343 if (ctxvis
->depthBits
&& ctxvis
->depthBits
!= bufvis
->depthBits
)
1346 if (ctxvis
->stencilBits
&& ctxvis
->stencilBits
!= bufvis
->stencilBits
)
1354 * Do one-time initialization for the given framebuffer. Specifically,
1355 * ask the driver for the window's current size and update the framebuffer
1357 * Really, the device driver should totally take care of this.
1360 initialize_framebuffer_size(struct gl_context
*ctx
, struct gl_framebuffer
*fb
)
1362 GLuint width
, height
;
1363 if (ctx
->Driver
.GetBufferSize
) {
1364 ctx
->Driver
.GetBufferSize(fb
, &width
, &height
);
1365 if (ctx
->Driver
.ResizeBuffers
)
1366 ctx
->Driver
.ResizeBuffers(ctx
, fb
, width
, height
);
1367 fb
->Initialized
= GL_TRUE
;
1373 * Check if the viewport/scissor size has not yet been initialized.
1374 * Initialize the size if the given width and height are non-zero.
1377 _mesa_check_init_viewport(struct gl_context
*ctx
, GLuint width
, GLuint height
)
1379 if (!ctx
->ViewportInitialized
&& width
> 0 && height
> 0) {
1380 /* Note: set flag here, before calling _mesa_set_viewport(), to prevent
1381 * potential infinite recursion.
1383 ctx
->ViewportInitialized
= GL_TRUE
;
1384 _mesa_set_viewport(ctx
, 0, 0, width
, height
);
1385 _mesa_set_scissor(ctx
, 0, 0, width
, height
);
1391 * Bind the given context to the given drawBuffer and readBuffer and
1392 * make it the current context for the calling thread.
1393 * We'll render into the drawBuffer and read pixels from the
1394 * readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
1396 * We check that the context's and framebuffer's visuals are compatible
1397 * and return immediately if they're not.
1399 * \param newCtx the new GL context. If NULL then there will be no current GL
1401 * \param drawBuffer the drawing framebuffer
1402 * \param readBuffer the reading framebuffer
1405 _mesa_make_current( struct gl_context
*newCtx
,
1406 struct gl_framebuffer
*drawBuffer
,
1407 struct gl_framebuffer
*readBuffer
)
1409 GET_CURRENT_CONTEXT(curCtx
);
1411 if (MESA_VERBOSE
& VERBOSE_API
)
1412 _mesa_debug(newCtx
, "_mesa_make_current()\n");
1414 /* Check that the context's and framebuffer's visuals are compatible.
1416 if (newCtx
&& drawBuffer
&& newCtx
->WinSysDrawBuffer
!= drawBuffer
) {
1417 if (!check_compatible(newCtx
, drawBuffer
)) {
1418 _mesa_warning(newCtx
,
1419 "MakeCurrent: incompatible visuals for context and drawbuffer");
1423 if (newCtx
&& readBuffer
&& newCtx
->WinSysReadBuffer
!= readBuffer
) {
1424 if (!check_compatible(newCtx
, readBuffer
)) {
1425 _mesa_warning(newCtx
,
1426 "MakeCurrent: incompatible visuals for context and readbuffer");
1432 (curCtx
->WinSysDrawBuffer
|| curCtx
->WinSysReadBuffer
) &&
1433 /* make sure this context is valid for flushing */
1435 _mesa_flush(curCtx
);
1437 /* We used to call _glapi_check_multithread() here. Now do it in drivers */
1438 _glapi_set_context((void *) newCtx
);
1439 ASSERT(_mesa_get_current_context() == newCtx
);
1442 _glapi_set_dispatch(NULL
); /* none current */
1445 _glapi_set_dispatch(newCtx
->CurrentDispatch
);
1447 if (drawBuffer
&& readBuffer
) {
1448 ASSERT(drawBuffer
->Name
== 0);
1449 ASSERT(readBuffer
->Name
== 0);
1450 _mesa_reference_framebuffer(&newCtx
->WinSysDrawBuffer
, drawBuffer
);
1451 _mesa_reference_framebuffer(&newCtx
->WinSysReadBuffer
, readBuffer
);
1454 * Only set the context's Draw/ReadBuffer fields if they're NULL
1455 * or not bound to a user-created FBO.
1457 if (!newCtx
->DrawBuffer
|| newCtx
->DrawBuffer
->Name
== 0) {
1458 _mesa_reference_framebuffer(&newCtx
->DrawBuffer
, drawBuffer
);
1459 /* Update the FBO's list of drawbuffers/renderbuffers.
1460 * For winsys FBOs this comes from the GL state (which may have
1461 * changed since the last time this FBO was bound).
1463 _mesa_update_draw_buffers(newCtx
);
1465 if (!newCtx
->ReadBuffer
|| newCtx
->ReadBuffer
->Name
== 0) {
1466 _mesa_reference_framebuffer(&newCtx
->ReadBuffer
, readBuffer
);
1469 /* XXX only set this flag if we're really changing the draw/read
1470 * framebuffer bindings.
1472 newCtx
->NewState
|= _NEW_BUFFERS
;
1475 /* We want to get rid of these lines: */
1478 if (!drawBuffer
->Initialized
) {
1479 initialize_framebuffer_size(newCtx
, drawBuffer
);
1481 if (readBuffer
!= drawBuffer
&& !readBuffer
->Initialized
) {
1482 initialize_framebuffer_size(newCtx
, readBuffer
);
1485 _mesa_resizebuffers(newCtx
);
1489 /* We want the drawBuffer and readBuffer to be initialized by
1491 * This generally means the Width and Height match the actual
1492 * window size and the renderbuffers (both hardware and software
1493 * based) are allocated to match. The later can generally be
1494 * done with a call to _mesa_resize_framebuffer().
1496 * It's theoretically possible for a buffer to have zero width
1497 * or height, but for now, assert check that the driver did what's
1500 ASSERT(drawBuffer
->Width
> 0);
1501 ASSERT(drawBuffer
->Height
> 0);
1505 _mesa_check_init_viewport(newCtx
,
1506 drawBuffer
->Width
, drawBuffer
->Height
);
1510 if (newCtx
->FirstTimeCurrent
) {
1511 _mesa_compute_version(newCtx
);
1513 newCtx
->Extensions
.String
= _mesa_make_extension_string(newCtx
);
1515 check_context_limits(newCtx
);
1517 /* We can use this to help debug user's problems. Tell them to set
1518 * the MESA_INFO env variable before running their app. Then the
1519 * first time each context is made current we'll print some useful
1522 if (_mesa_getenv("MESA_INFO")) {
1526 newCtx
->FirstTimeCurrent
= GL_FALSE
;
1535 * Make context 'ctx' share the display lists, textures and programs
1536 * that are associated with 'ctxToShare'.
1537 * Any display lists, textures or programs associated with 'ctx' will
1538 * be deleted if nobody else is sharing them.
1541 _mesa_share_state(struct gl_context
*ctx
, struct gl_context
*ctxToShare
)
1543 if (ctx
&& ctxToShare
&& ctx
->Shared
&& ctxToShare
->Shared
) {
1544 struct gl_shared_state
*oldShared
= NULL
;
1546 /* save ref to old state to prevent it from being deleted immediately */
1547 _mesa_reference_shared_state(ctx
, &oldShared
, ctx
->Shared
);
1549 /* update ctx's Shared pointer */
1550 _mesa_reference_shared_state(ctx
, &ctx
->Shared
, ctxToShare
->Shared
);
1552 update_default_objects(ctx
);
1554 /* release the old shared state */
1555 _mesa_reference_shared_state(ctx
, &oldShared
, NULL
);
1567 * \return pointer to the current GL context for this thread.
1569 * Calls _glapi_get_context(). This isn't the fastest way to get the current
1570 * context. If you need speed, see the #GET_CURRENT_CONTEXT macro in
1574 _mesa_get_current_context( void )
1576 return (struct gl_context
*) _glapi_get_context();
1581 * Get context's current API dispatch table.
1583 * It'll either be the immediate-mode execute dispatcher or the display list
1584 * compile dispatcher.
1586 * \param ctx GL context.
1588 * \return pointer to dispatch_table.
1590 * Simply returns __struct gl_contextRec::CurrentDispatch.
1592 struct _glapi_table
*
1593 _mesa_get_dispatch(struct gl_context
*ctx
)
1595 return ctx
->CurrentDispatch
;
1601 /**********************************************************************/
1602 /** \name Miscellaneous functions */
1603 /**********************************************************************/
1609 * \param ctx GL context.
1610 * \param error error code.
1612 * Records the given error code and call the driver's dd_function_table::Error
1613 * function if defined.
1616 * This is called via _mesa_error().
1619 _mesa_record_error(struct gl_context
*ctx
, GLenum error
)
1624 if (ctx
->ErrorValue
== GL_NO_ERROR
) {
1625 ctx
->ErrorValue
= error
;
1628 /* Call device driver's error handler, if any. This is used on the Mac. */
1629 if (ctx
->Driver
.Error
) {
1630 ctx
->Driver
.Error(ctx
);
1636 * Flush commands and wait for completion.
1639 _mesa_finish(struct gl_context
*ctx
)
1641 FLUSH_VERTICES( ctx
, 0 );
1642 FLUSH_CURRENT( ctx
, 0 );
1643 if (ctx
->Driver
.Finish
) {
1644 ctx
->Driver
.Finish(ctx
);
1653 _mesa_flush(struct gl_context
*ctx
)
1655 FLUSH_VERTICES( ctx
, 0 );
1656 FLUSH_CURRENT( ctx
, 0 );
1657 if (ctx
->Driver
.Flush
) {
1658 ctx
->Driver
.Flush(ctx
);
1665 * Execute glFinish().
1667 * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1668 * dd_function_table::Finish driver callback, if not NULL.
1673 GET_CURRENT_CONTEXT(ctx
);
1674 ASSERT_OUTSIDE_BEGIN_END(ctx
);
1680 * Execute glFlush().
1682 * Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
1683 * dd_function_table::Flush driver callback, if not NULL.
1688 GET_CURRENT_CONTEXT(ctx
);
1689 ASSERT_OUTSIDE_BEGIN_END(ctx
);
1695 * Set mvp_with_dp4 flag. If a driver has a preference for DP4 over
1696 * MUL/MAD, or vice versa, call this function to register that.
1697 * Otherwise we default to MUL/MAD.
1700 _mesa_set_mvp_with_dp4( struct gl_context
*ctx
,
1703 ctx
->mvp_with_dp4
= flag
;
1707 blend_factor_is_dual_src(GLenum factor
)
1709 return factor
== GL_SRC1_COLOR
|| factor
== GL_SRC1_ALPHA
||
1710 factor
== GL_ONE_MINUS_SRC1_COLOR
|| factor
== GL_ONE_MINUS_SRC1_ALPHA
;
1714 * ARB_blend_func_extended - ERRORS section
1715 * "The error INVALID_OPERATION is generated by Begin or any procedure that
1716 * implicitly calls Begin if any draw buffer has a blend function requiring the
1717 * second color input (SRC1_COLOR, ONE_MINUS_SRC1_COLOR, SRC1_ALPHA or
1718 * ONE_MINUS_SRC1_ALPHA), and a framebuffer is bound that has more than
1719 * the value of MAX_DUAL_SOURCE_DRAW_BUFFERS-1 active color attachements."
1722 _mesa_check_blend_func_error(struct gl_context
*ctx
)
1725 for (i
= 0; i
< ctx
->DrawBuffer
->_NumColorDrawBuffers
; i
++) {
1726 if (blend_factor_is_dual_src(ctx
->Color
.Blend
[i
].SrcRGB
) ||
1727 blend_factor_is_dual_src(ctx
->Color
.Blend
[i
].DstRGB
) ||
1728 blend_factor_is_dual_src(ctx
->Color
.Blend
[i
].SrcA
) ||
1729 blend_factor_is_dual_src(ctx
->Color
.Blend
[i
].DstA
)) {
1730 if (i
>= ctx
->Const
.MaxDualSourceDrawBuffers
) {
1731 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1732 "dual source blend on illegal attachment");
1741 * Prior to drawing anything with glBegin, glDrawArrays, etc. this function
1742 * is called to see if it's valid to render. This involves checking that
1743 * the current shader is valid and the framebuffer is complete.
1744 * If an error is detected it'll be recorded here.
1745 * \return GL_TRUE if OK to render, GL_FALSE if not
1748 _mesa_valid_to_render(struct gl_context
*ctx
, const char *where
)
1750 bool vert_from_glsl_shader
= false;
1751 bool geom_from_glsl_shader
= false;
1752 bool frag_from_glsl_shader
= false;
1754 /* This depends on having up to date derived state (shaders) */
1756 _mesa_update_state(ctx
);
1758 if (ctx
->Shader
.CurrentVertexProgram
) {
1759 vert_from_glsl_shader
= true;
1761 if (!ctx
->Shader
.CurrentVertexProgram
->LinkStatus
) {
1762 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1763 "%s(shader not linked)", where
);
1766 #if 0 /* not normally enabled */
1769 if (!_mesa_validate_shader_program(ctx
,
1770 ctx
->Shader
.CurrentVertexProgram
,
1772 _mesa_warning(ctx
, "Shader program %u is invalid: %s",
1773 ctx
->Shader
.CurrentVertexProgram
->Name
, errMsg
);
1779 if (ctx
->Shader
.CurrentGeometryProgram
) {
1780 geom_from_glsl_shader
= true;
1782 if (!ctx
->Shader
.CurrentGeometryProgram
->LinkStatus
) {
1783 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1784 "%s(shader not linked)", where
);
1787 #if 0 /* not normally enabled */
1790 if (!_mesa_validate_shader_program(ctx
,
1791 ctx
->Shader
.CurrentGeometryProgram
,
1793 _mesa_warning(ctx
, "Shader program %u is invalid: %s",
1794 ctx
->Shader
.CurrentGeometryProgram
->Name
, errMsg
);
1800 if (ctx
->Shader
.CurrentFragmentProgram
) {
1801 frag_from_glsl_shader
= true;
1803 if (!ctx
->Shader
.CurrentFragmentProgram
->LinkStatus
) {
1804 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1805 "%s(shader not linked)", where
);
1808 #if 0 /* not normally enabled */
1811 if (!_mesa_validate_shader_program(ctx
,
1812 ctx
->Shader
.CurrentFragmentProgram
,
1814 _mesa_warning(ctx
, "Shader program %u is invalid: %s",
1815 ctx
->Shader
.CurrentFragmentProgram
->Name
, errMsg
);
1821 /* Any shader stages that are not supplied by the GLSL shader and have
1822 * assembly shaders enabled must now be validated.
1824 if (!vert_from_glsl_shader
1825 && ctx
->VertexProgram
.Enabled
&& !ctx
->VertexProgram
._Enabled
) {
1826 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1827 "%s(vertex program not valid)", where
);
1831 /* FINISHME: If GL_NV_geometry_program4 is ever supported, the current
1832 * FINISHME: geometry program should validated here.
1834 (void) geom_from_glsl_shader
;
1836 if (!frag_from_glsl_shader
) {
1837 if (ctx
->FragmentProgram
.Enabled
&& !ctx
->FragmentProgram
._Enabled
) {
1838 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1839 "%s(fragment program not valid)", where
);
1843 /* If drawing to integer-valued color buffers, there must be an
1844 * active fragment shader (GL_EXT_texture_integer).
1846 if (ctx
->DrawBuffer
&& ctx
->DrawBuffer
->_IntegerColor
) {
1847 _mesa_error(ctx
, GL_INVALID_OPERATION
,
1848 "%s(integer format but no fragment shader)", where
);
1853 if (ctx
->DrawBuffer
->_Status
!= GL_FRAMEBUFFER_COMPLETE_EXT
) {
1854 _mesa_error(ctx
, GL_INVALID_FRAMEBUFFER_OPERATION_EXT
,
1855 "%s(incomplete framebuffer)", where
);
1859 if (_mesa_check_blend_func_error(ctx
) == GL_FALSE
) {
1864 if (ctx
->Shader
.Flags
& GLSL_LOG
) {
1865 struct gl_shader_program
*shProg
[MESA_SHADER_TYPES
];
1868 shProg
[MESA_SHADER_VERTEX
] = ctx
->Shader
.CurrentVertexProgram
;
1869 shProg
[MESA_SHADER_GEOMETRY
] = ctx
->Shader
.CurrentGeometryProgram
;
1870 shProg
[MESA_SHADER_FRAGMENT
] = ctx
->Shader
.CurrentFragmentProgram
;
1872 for (i
= 0; i
< MESA_SHADER_TYPES
; i
++) {
1873 if (shProg
[i
] == NULL
|| shProg
[i
]->_Used
1874 || shProg
[i
]->_LinkedShaders
[i
] == NULL
)
1877 /* This is the first time this shader is being used.
1878 * Append shader's constants/uniforms to log file.
1880 * Only log data for the program target that matches the shader
1881 * target. It's possible to have a program bound to the vertex
1882 * shader target that also supplied a fragment shader. If that
1883 * program isn't also bound to the fragment shader target we don't
1884 * want to log its fragment data.
1886 _mesa_append_uniforms_to_file(shProg
[i
]->_LinkedShaders
[i
]);
1889 for (i
= 0; i
< MESA_SHADER_TYPES
; i
++) {
1890 if (shProg
[i
] != NULL
)
1891 shProg
[i
]->_Used
= GL_TRUE
;