/**
* \file context.c
* Mesa context/visual/framebuffer management functions.
* \author Brian Paul
*/
/*
* Mesa 3-D graphics library
* Version: 6.5
*
* Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**
* \mainpage Mesa Main Module
*
* \section MainIntroduction Introduction
*
* The Mesa Main module consists of all the files in the main/ directory.
* Among the features of this module are:
*
* - Structures to represent most GL state
* - State set/get functions
* - Display lists
* - Texture unit, object and image handling
* - Matrix and attribute stacks
*
*
* Other modules are responsible for API dispatch, vertex transformation,
* point/line/triangle setup, rasterization, vertex array caching,
* vertex/fragment programs/shaders, etc.
*
*
* \section AboutDoxygen About Doxygen
*
* If you're viewing this information as Doxygen-generated HTML you'll
* see the documentation index at the top of this page.
*
* The first line lists the Mesa source code modules.
* The second line lists the indexes available for viewing the documentation
* for each module.
*
* Selecting the Main page link will display a summary of the module
* (this page).
*
* Selecting Data Structures will list all C structures.
*
* Selecting the File List link will list all the source files in
* the module.
* Selecting a filename will show a list of all functions defined in that file.
*
* Selecting the Data Fields link will display a list of all
* documented structure members.
*
* Selecting the Globals link will display a list
* of all functions, structures, global variables and macros in the module.
*
*/
#include "glheader.h"
#include "imports.h"
#include "accum.h"
#include "api_exec.h"
#include "arrayobj.h"
#include "attrib.h"
#include "blend.h"
#include "buffers.h"
#include "bufferobj.h"
#include "colortab.h"
#include "context.h"
#include "debug.h"
#include "depth.h"
#include "dlist.h"
#include "eval.h"
#include "enums.h"
#include "extensions.h"
#include "fbobject.h"
#include "feedback.h"
#include "fog.h"
#include "framebuffer.h"
#include "get.h"
#include "histogram.h"
#include "hint.h"
#include "hash.h"
#include "light.h"
#include "lines.h"
#include "macros.h"
#include "matrix.h"
#include "pixel.h"
#include "pixelstore.h"
#include "points.h"
#include "polygon.h"
#include "queryobj.h"
#include "rastpos.h"
#include "scissor.h"
#include "simple_list.h"
#include "state.h"
#include "stencil.h"
#include "texcompress.h"
#include "teximage.h"
#include "texobj.h"
#include "texstate.h"
#include "mtypes.h"
#include "varray.h"
#include "version.h"
#include "vtxfmt.h"
#include "glapi/glthread.h"
#include "glapi/glapioffsets.h"
#if FEATURE_NV_vertex_program || FEATURE_NV_fragment_program
#include "shader/program.h"
#endif
#include "shader/shader_api.h"
#include "shader/atifragshader.h"
#if _HAVE_FULL_GL
#include "math/m_translate.h"
#include "math/m_matrix.h"
#include "math/m_xform.h"
#include "math/mathmod.h"
#endif
#ifdef USE_SPARC_ASM
#include "sparc/sparc.h"
#endif
#ifndef MESA_VERBOSE
int MESA_VERBOSE = 0;
#endif
#ifndef MESA_DEBUG_FLAGS
int MESA_DEBUG_FLAGS = 0;
#endif
/* ubyte -> float conversion */
GLfloat _mesa_ubyte_to_float_color_tab[256];
/**
* Swap buffers notification callback.
*
* \param gc GL context.
*
* Called by window system just before swapping buffers.
* We have to finish any pending rendering.
*/
void
_mesa_notifySwapBuffers(__GLcontext *ctx)
{
if (ctx->Driver.Flush) {
ctx->Driver.Flush(ctx);
}
}
/**********************************************************************/
/** \name GL Visual allocation/destruction */
/**********************************************************************/
/*@{*/
/**
* Allocates a GLvisual structure and initializes it via
* _mesa_initialize_visual().
*
* \param rgbFlag GL_TRUE for RGB(A) mode, GL_FALSE for Color Index mode.
* \param dbFlag double buffering
* \param stereoFlag stereo buffer
* \param depthBits requested bits per depth buffer value. Any value in [0, 32]
* is acceptable but the actual depth type will be GLushort or GLuint as
* needed.
* \param stencilBits requested minimum bits per stencil buffer value
* \param accumRedBits, accumGreenBits, accumBlueBits, accumAlphaBits number of bits per color component in accum buffer.
* \param indexBits number of bits per pixel if \p rgbFlag is GL_FALSE
* \param redBits number of bits per color component in frame buffer for RGB(A)
* mode. We always use 8 in core Mesa though.
* \param greenBits same as above.
* \param blueBits same as above.
* \param alphaBits same as above.
* \param numSamples not really used.
*
* \return pointer to new GLvisual or NULL if requested parameters can't be
* met.
*
* \note Need to add params for level and numAuxBuffers (at least)
*/
GLvisual *
_mesa_create_visual( GLboolean rgbFlag,
GLboolean dbFlag,
GLboolean stereoFlag,
GLint redBits,
GLint greenBits,
GLint blueBits,
GLint alphaBits,
GLint indexBits,
GLint depthBits,
GLint stencilBits,
GLint accumRedBits,
GLint accumGreenBits,
GLint accumBlueBits,
GLint accumAlphaBits,
GLint numSamples )
{
GLvisual *vis = (GLvisual *) _mesa_calloc(sizeof(GLvisual));
if (vis) {
if (!_mesa_initialize_visual(vis, rgbFlag, dbFlag, stereoFlag,
redBits, greenBits, blueBits, alphaBits,
indexBits, depthBits, stencilBits,
accumRedBits, accumGreenBits,
accumBlueBits, accumAlphaBits,
numSamples)) {
_mesa_free(vis);
return NULL;
}
}
return vis;
}
/**
* Makes some sanity checks and fills in the fields of the
* GLvisual object with the given parameters. If the caller needs
* to set additional fields, he should just probably init the whole GLvisual
* object himself.
* \return GL_TRUE on success, or GL_FALSE on failure.
*
* \sa _mesa_create_visual() above for the parameter description.
*/
GLboolean
_mesa_initialize_visual( GLvisual *vis,
GLboolean rgbFlag,
GLboolean dbFlag,
GLboolean stereoFlag,
GLint redBits,
GLint greenBits,
GLint blueBits,
GLint alphaBits,
GLint indexBits,
GLint depthBits,
GLint stencilBits,
GLint accumRedBits,
GLint accumGreenBits,
GLint accumBlueBits,
GLint accumAlphaBits,
GLint numSamples )
{
assert(vis);
if (depthBits < 0 || depthBits > 32) {
return GL_FALSE;
}
if (stencilBits < 0 || stencilBits > STENCIL_BITS) {
return GL_FALSE;
}
assert(accumRedBits >= 0);
assert(accumGreenBits >= 0);
assert(accumBlueBits >= 0);
assert(accumAlphaBits >= 0);
vis->rgbMode = rgbFlag;
vis->doubleBufferMode = dbFlag;
vis->stereoMode = stereoFlag;
vis->redBits = redBits;
vis->greenBits = greenBits;
vis->blueBits = blueBits;
vis->alphaBits = alphaBits;
vis->rgbBits = redBits + greenBits + blueBits;
vis->indexBits = indexBits;
vis->depthBits = depthBits;
vis->stencilBits = stencilBits;
vis->accumRedBits = accumRedBits;
vis->accumGreenBits = accumGreenBits;
vis->accumBlueBits = accumBlueBits;
vis->accumAlphaBits = accumAlphaBits;
vis->haveAccumBuffer = accumRedBits > 0;
vis->haveDepthBuffer = depthBits > 0;
vis->haveStencilBuffer = stencilBits > 0;
vis->numAuxBuffers = 0;
vis->level = 0;
vis->pixmapMode = 0;
vis->sampleBuffers = numSamples > 0 ? 1 : 0;
vis->samples = numSamples;
return GL_TRUE;
}
/**
* Destroy a visual and free its memory.
*
* \param vis visual.
*
* Frees the visual structure.
*/
void
_mesa_destroy_visual( GLvisual *vis )
{
_mesa_free(vis);
}
/*@}*/
/**********************************************************************/
/** \name Context allocation, initialization, destroying
*
* The purpose of the most initialization functions here is to provide the
* default state values according to the OpenGL specification.
*/
/**********************************************************************/
/*@{*/
/**
* One-time initialization mutex lock.
*
* \sa Used by one_time_init().
*/
_glthread_DECLARE_STATIC_MUTEX(OneTimeLock);
/**
* Calls all the various one-time-init functions in Mesa.
*
* While holding a global mutex lock, calls several initialization functions,
* and sets the glapi callbacks if the \c MESA_DEBUG environment variable is
* defined.
*
* \sa _math_init().
*/
static void
one_time_init( GLcontext *ctx )
{
static GLboolean alreadyCalled = GL_FALSE;
(void) ctx;
_glthread_LOCK_MUTEX(OneTimeLock);
if (!alreadyCalled) {
GLuint i;
/* do some implementation tests */
assert( sizeof(GLbyte) == 1 );
assert( sizeof(GLubyte) == 1 );
assert( sizeof(GLshort) == 2 );
assert( sizeof(GLushort) == 2 );
assert( sizeof(GLint) == 4 );
assert( sizeof(GLuint) == 4 );
_mesa_init_sqrt_table();
#if _HAVE_FULL_GL
_math_init();
for (i = 0; i < 256; i++) {
_mesa_ubyte_to_float_color_tab[i] = (float) i / 255.0F;
}
#endif
#ifdef USE_SPARC_ASM
_mesa_init_sparc_glapi_relocs();
#endif
if (_mesa_getenv("MESA_DEBUG")) {
_glapi_noop_enable_warnings(GL_TRUE);
_glapi_set_warning_func( (_glapi_warning_func) _mesa_warning );
}
else {
_glapi_noop_enable_warnings(GL_FALSE);
}
#if defined(DEBUG) && defined(__DATE__) && defined(__TIME__)
_mesa_debug(ctx, "Mesa %s DEBUG build %s %s\n",
MESA_VERSION_STRING, __DATE__, __TIME__);
#endif
alreadyCalled = GL_TRUE;
}
_glthread_UNLOCK_MUTEX(OneTimeLock);
}
/**
* Allocate and initialize a shared context state structure.
* Initializes the display list, texture objects and vertex programs hash
* tables, allocates the texture objects. If it runs out of memory, frees
* everything already allocated before returning NULL.
*
* \return pointer to a gl_shared_state structure on success, or NULL on
* failure.
*/
static GLboolean
alloc_shared_state( GLcontext *ctx )
{
struct gl_shared_state *ss = CALLOC_STRUCT(gl_shared_state);
if (!ss)
return GL_FALSE;
ctx->Shared = ss;
_glthread_INIT_MUTEX(ss->Mutex);
ss->DisplayList = _mesa_NewHashTable();
ss->TexObjects = _mesa_NewHashTable();
#if FEATURE_NV_vertex_program || FEATURE_NV_fragment_program
ss->Programs = _mesa_NewHashTable();
#endif
#if FEATURE_ARB_vertex_program
ss->DefaultVertexProgram = (struct gl_vertex_program *)
ctx->Driver.NewProgram(ctx, GL_VERTEX_PROGRAM_ARB, 0);
if (!ss->DefaultVertexProgram)
goto cleanup;
#endif
#if FEATURE_ARB_fragment_program
ss->DefaultFragmentProgram = (struct gl_fragment_program *)
ctx->Driver.NewProgram(ctx, GL_FRAGMENT_PROGRAM_ARB, 0);
if (!ss->DefaultFragmentProgram)
goto cleanup;
#endif
#if FEATURE_ATI_fragment_shader
ss->ATIShaders = _mesa_NewHashTable();
ss->DefaultFragmentShader = _mesa_new_ati_fragment_shader(ctx, 0);
if (!ss->DefaultFragmentShader)
goto cleanup;
#endif
#if FEATURE_ARB_vertex_buffer_object || FEATURE_ARB_pixel_buffer_object
ss->BufferObjects = _mesa_NewHashTable();
#endif
ss->ArrayObjects = _mesa_NewHashTable();
#if FEATURE_ARB_shader_objects
ss->ShaderObjects = _mesa_NewHashTable();
#endif
ss->Default1D = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_1D);
if (!ss->Default1D)
goto cleanup;
ss->Default2D = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_2D);
if (!ss->Default2D)
goto cleanup;
ss->Default3D = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_3D);
if (!ss->Default3D)
goto cleanup;
ss->DefaultCubeMap = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_CUBE_MAP_ARB);
if (!ss->DefaultCubeMap)
goto cleanup;
ss->DefaultRect = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_RECTANGLE_NV);
if (!ss->DefaultRect)
goto cleanup;
ss->Default1DArray = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_1D_ARRAY_EXT);
if (!ss->Default1DArray)
goto cleanup;
ss->Default2DArray = (*ctx->Driver.NewTextureObject)(ctx, 0, GL_TEXTURE_2D_ARRAY_EXT);
if (!ss->Default2DArray)
goto cleanup;
/* Effectively bind the default textures to all texture units */
ss->Default1D->RefCount += MAX_TEXTURE_IMAGE_UNITS;
ss->Default2D->RefCount += MAX_TEXTURE_IMAGE_UNITS;
ss->Default3D->RefCount += MAX_TEXTURE_IMAGE_UNITS;
ss->DefaultCubeMap->RefCount += MAX_TEXTURE_IMAGE_UNITS;
ss->DefaultRect->RefCount += MAX_TEXTURE_IMAGE_UNITS;
ss->Default1DArray->RefCount += MAX_TEXTURE_IMAGE_UNITS;
ss->Default2DArray->RefCount += MAX_TEXTURE_IMAGE_UNITS;
_glthread_INIT_MUTEX(ss->TexMutex);
ss->TextureStateStamp = 0;
#if FEATURE_EXT_framebuffer_object
ss->FrameBuffers = _mesa_NewHashTable();
if (!ss->FrameBuffers)
goto cleanup;
ss->RenderBuffers = _mesa_NewHashTable();
if (!ss->RenderBuffers)
goto cleanup;
#endif
return GL_TRUE;
cleanup:
/* Ran out of memory at some point. Free everything and return NULL */
if (ss->DisplayList)
_mesa_DeleteHashTable(ss->DisplayList);
if (ss->TexObjects)
_mesa_DeleteHashTable(ss->TexObjects);
#if FEATURE_NV_vertex_program
if (ss->Programs)
_mesa_DeleteHashTable(ss->Programs);
#endif
#if FEATURE_ARB_vertex_program
_mesa_reference_vertprog(ctx, &ss->DefaultVertexProgram, NULL);
#endif
#if FEATURE_ARB_fragment_program
_mesa_reference_fragprog(ctx, &ss->DefaultFragmentProgram, NULL);
#endif
#if FEATURE_ATI_fragment_shader
if (ss->DefaultFragmentShader)
_mesa_delete_ati_fragment_shader(ctx, ss->DefaultFragmentShader);
#endif
#if FEATURE_ARB_vertex_buffer_object || FEATURE_ARB_pixel_buffer_object
if (ss->BufferObjects)
_mesa_DeleteHashTable(ss->BufferObjects);
#endif
if (ss->ArrayObjects)
_mesa_DeleteHashTable (ss->ArrayObjects);
#if FEATURE_ARB_shader_objects
if (ss->ShaderObjects)
_mesa_DeleteHashTable (ss->ShaderObjects);
#endif
#if FEATURE_EXT_framebuffer_object
if (ss->FrameBuffers)
_mesa_DeleteHashTable(ss->FrameBuffers);
if (ss->RenderBuffers)
_mesa_DeleteHashTable(ss->RenderBuffers);
#endif
if (ss->Default1D)
(*ctx->Driver.DeleteTexture)(ctx, ss->Default1D);
if (ss->Default2D)
(*ctx->Driver.DeleteTexture)(ctx, ss->Default2D);
if (ss->Default3D)
(*ctx->Driver.DeleteTexture)(ctx, ss->Default3D);
if (ss->DefaultCubeMap)
(*ctx->Driver.DeleteTexture)(ctx, ss->DefaultCubeMap);
if (ss->DefaultRect)
(*ctx->Driver.DeleteTexture)(ctx, ss->DefaultRect);
if (ss->Default1DArray)
(*ctx->Driver.DeleteTexture)(ctx, ss->Default1DArray);
if (ss->Default2DArray)
(*ctx->Driver.DeleteTexture)(ctx, ss->Default2DArray);
_mesa_free(ss);
return GL_FALSE;
}
/**
* Callback for deleting a display list. Called by _mesa_HashDeleteAll().
*/
static void
delete_displaylist_cb(GLuint id, void *data, void *userData)
{
struct mesa_display_list *list = (struct mesa_display_list *) data;
GLcontext *ctx = (GLcontext *) userData;
_mesa_delete_list(ctx, list);
}
/**
* Callback for deleting a texture object. Called by _mesa_HashDeleteAll().
*/
static void
delete_texture_cb(GLuint id, void *data, void *userData)
{
struct gl_texture_object *texObj = (struct gl_texture_object *) data;
GLcontext *ctx = (GLcontext *) userData;
ctx->Driver.DeleteTexture(ctx, texObj);
}
/**
* Callback for deleting a program object. Called by _mesa_HashDeleteAll().
*/
static void
delete_program_cb(GLuint id, void *data, void *userData)
{
struct gl_program *prog = (struct gl_program *) data;
GLcontext *ctx = (GLcontext *) userData;
ASSERT(prog->RefCount == 1); /* should only be referenced by hash table */
prog->RefCount = 0; /* now going away */
ctx->Driver.DeleteProgram(ctx, prog);
}
/**
* Callback for deleting an ATI fragment shader object.
* Called by _mesa_HashDeleteAll().
*/
static void
delete_fragshader_cb(GLuint id, void *data, void *userData)
{
struct ati_fragment_shader *shader = (struct ati_fragment_shader *) data;
GLcontext *ctx = (GLcontext *) userData;
_mesa_delete_ati_fragment_shader(ctx, shader);
}
/**
* Callback for deleting a buffer object. Called by _mesa_HashDeleteAll().
*/
static void
delete_bufferobj_cb(GLuint id, void *data, void *userData)
{
struct gl_buffer_object *bufObj = (struct gl_buffer_object *) data;
GLcontext *ctx = (GLcontext *) userData;
ctx->Driver.DeleteBuffer(ctx, bufObj);
}
/**
* Callback for deleting an array object. Called by _mesa_HashDeleteAll().
*/
static void
delete_arrayobj_cb(GLuint id, void *data, void *userData)
{
struct gl_array_object *arrayObj = (struct gl_array_object *) data;
GLcontext *ctx = (GLcontext *) userData;
_mesa_delete_array_object(ctx, arrayObj);
}
/**
* Callback for freeing shader program data. Call it before delete_shader_cb
* to avoid memory access error.
*/
static void
free_shader_program_data_cb(GLuint id, void *data, void *userData)
{
GLcontext *ctx = (GLcontext *) userData;
struct gl_shader_program *shProg = (struct gl_shader_program *) data;
if (shProg->Type == GL_SHADER_PROGRAM_MESA) {
_mesa_free_shader_program_data(ctx, shProg);
}
}
/**
* Callback for deleting shader and shader programs objects.
* Called by _mesa_HashDeleteAll().
*/
static void
delete_shader_cb(GLuint id, void *data, void *userData)
{
GLcontext *ctx = (GLcontext *) userData;
struct gl_shader *sh = (struct gl_shader *) data;
if (sh->Type == GL_FRAGMENT_SHADER || sh->Type == GL_VERTEX_SHADER) {
_mesa_free_shader(ctx, sh);
}
else {
struct gl_shader_program *shProg = (struct gl_shader_program *) data;
ASSERT(shProg->Type == GL_SHADER_PROGRAM_MESA);
_mesa_free_shader_program(ctx, shProg);
}
}
/**
* Deallocate a shared state object and all children structures.
*
* \param ctx GL context.
* \param ss shared state pointer.
*
* Frees the display lists, the texture objects (calling the driver texture
* deletion callback to free its private data) and the vertex programs, as well
* as their hash tables.
*
* \sa alloc_shared_state().
*/
static void
free_shared_state( GLcontext *ctx, struct gl_shared_state *ss )
{
/*
* Free display lists
*/
_mesa_HashDeleteAll(ss->DisplayList, delete_displaylist_cb, ctx);
_mesa_DeleteHashTable(ss->DisplayList);
#if FEATURE_ARB_shader_objects
_mesa_HashWalk(ss->ShaderObjects, free_shader_program_data_cb, ctx);
_mesa_HashDeleteAll(ss->ShaderObjects, delete_shader_cb, ctx);
_mesa_DeleteHashTable(ss->ShaderObjects);
#endif
#if defined(FEATURE_NV_vertex_program) || defined(FEATURE_NV_fragment_program)
_mesa_HashDeleteAll(ss->Programs, delete_program_cb, ctx);
_mesa_DeleteHashTable(ss->Programs);
#endif
#if FEATURE_ARB_vertex_program
_mesa_reference_vertprog(ctx, &ss->DefaultVertexProgram, NULL);
#endif
#if FEATURE_ARB_fragment_program
_mesa_reference_fragprog(ctx, &ss->DefaultFragmentProgram, NULL);
#endif
#if FEATURE_ATI_fragment_shader
_mesa_HashDeleteAll(ss->ATIShaders, delete_fragshader_cb, ctx);
_mesa_DeleteHashTable(ss->ATIShaders);
_mesa_delete_ati_fragment_shader(ctx, ss->DefaultFragmentShader);
#endif
#if FEATURE_ARB_vertex_buffer_object || FEATURE_ARB_pixel_buffer_object
_mesa_HashDeleteAll(ss->BufferObjects, delete_bufferobj_cb, ctx);
_mesa_DeleteHashTable(ss->BufferObjects);
#endif
_mesa_HashDeleteAll(ss->ArrayObjects, delete_arrayobj_cb, ctx);
_mesa_DeleteHashTable(ss->ArrayObjects);
#if FEATURE_EXT_framebuffer_object
_mesa_DeleteHashTable(ss->FrameBuffers);
_mesa_DeleteHashTable(ss->RenderBuffers);
#endif
/*
* Free texture objects (after FBOs since some textures might have
* been bound to FBOs).
*/
ASSERT(ctx->Driver.DeleteTexture);
/* the default textures */
ctx->Driver.DeleteTexture(ctx, ss->Default1D);
ctx->Driver.DeleteTexture(ctx, ss->Default2D);
ctx->Driver.DeleteTexture(ctx, ss->Default3D);
ctx->Driver.DeleteTexture(ctx, ss->DefaultCubeMap);
ctx->Driver.DeleteTexture(ctx, ss->DefaultRect);
ctx->Driver.DeleteTexture(ctx, ss->Default1DArray);
ctx->Driver.DeleteTexture(ctx, ss->Default2DArray);
/* all other textures */
_mesa_HashDeleteAll(ss->TexObjects, delete_texture_cb, ctx);
_mesa_DeleteHashTable(ss->TexObjects);
_glthread_DESTROY_MUTEX(ss->Mutex);
_mesa_free(ss);
}
/**
* Initialize fields of gl_current_attrib (aka ctx->Current.*)
*/
static void
_mesa_init_current(GLcontext *ctx)
{
GLuint i;
/* Init all to (0,0,0,1) */
for (i = 0; i < VERT_ATTRIB_MAX; i++) {
ASSIGN_4V( ctx->Current.Attrib[i], 0.0, 0.0, 0.0, 1.0 );
}
/* redo special cases: */
ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_WEIGHT], 1.0, 0.0, 0.0, 1.0 );
ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_NORMAL], 0.0, 0.0, 1.0, 1.0 );
ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR0], 1.0, 1.0, 1.0, 1.0 );
ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR1], 0.0, 0.0, 0.0, 1.0 );
ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_COLOR_INDEX], 1.0, 0.0, 0.0, 1.0 );
ASSIGN_4V( ctx->Current.Attrib[VERT_ATTRIB_EDGEFLAG], 1.0, 0.0, 0.0, 1.0 );
}
/**
* Init vertex/fragment program native limits from logical limits.
*/
static void
init_natives(struct gl_program_constants *prog)
{
prog->MaxNativeInstructions = prog->MaxInstructions;
prog->MaxNativeAluInstructions = prog->MaxAluInstructions;
prog->MaxNativeTexInstructions = prog->MaxTexInstructions;
prog->MaxNativeTexIndirections = prog->MaxTexIndirections;
prog->MaxNativeAttribs = prog->MaxAttribs;
prog->MaxNativeTemps = prog->MaxTemps;
prog->MaxNativeAddressRegs = prog->MaxAddressRegs;
prog->MaxNativeParameters = prog->MaxParameters;
}
/**
* Initialize fields of gl_constants (aka ctx->Const.*).
* Use defaults from config.h. The device drivers will often override
* some of these values (such as number of texture units).
*/
static void
_mesa_init_constants(GLcontext *ctx)
{
assert(ctx);
assert(MAX_TEXTURE_LEVELS >= MAX_3D_TEXTURE_LEVELS);
assert(MAX_TEXTURE_LEVELS >= MAX_CUBE_TEXTURE_LEVELS);
assert(MAX_TEXTURE_UNITS >= MAX_TEXTURE_COORD_UNITS);
assert(MAX_TEXTURE_UNITS >= MAX_TEXTURE_IMAGE_UNITS);
/* Constants, may be overriden (usually only reduced) by device drivers */
ctx->Const.MaxTextureLevels = MAX_TEXTURE_LEVELS;
ctx->Const.Max3DTextureLevels = MAX_3D_TEXTURE_LEVELS;
ctx->Const.MaxCubeTextureLevels = MAX_CUBE_TEXTURE_LEVELS;
ctx->Const.MaxTextureRectSize = MAX_TEXTURE_RECT_SIZE;
ctx->Const.MaxArrayTextureLayers = MAX_ARRAY_TEXTURE_LAYERS;
ctx->Const.MaxTextureCoordUnits = MAX_TEXTURE_COORD_UNITS;
ctx->Const.MaxTextureImageUnits = MAX_TEXTURE_IMAGE_UNITS;
ctx->Const.MaxTextureUnits = MIN2(ctx->Const.MaxTextureCoordUnits,
ctx->Const.MaxTextureImageUnits);
ctx->Const.MaxTextureMaxAnisotropy = MAX_TEXTURE_MAX_ANISOTROPY;
ctx->Const.MaxTextureLodBias = MAX_TEXTURE_LOD_BIAS;
ctx->Const.MaxArrayLockSize = MAX_ARRAY_LOCK_SIZE;
ctx->Const.SubPixelBits = SUB_PIXEL_BITS;
ctx->Const.MinPointSize = MIN_POINT_SIZE;
ctx->Const.MaxPointSize = MAX_POINT_SIZE;
ctx->Const.MinPointSizeAA = MIN_POINT_SIZE;
ctx->Const.MaxPointSizeAA = MAX_POINT_SIZE;
ctx->Const.PointSizeGranularity = (GLfloat) POINT_SIZE_GRANULARITY;
ctx->Const.MinLineWidth = MIN_LINE_WIDTH;
ctx->Const.MaxLineWidth = MAX_LINE_WIDTH;
ctx->Const.MinLineWidthAA = MIN_LINE_WIDTH;
ctx->Const.MaxLineWidthAA = MAX_LINE_WIDTH;
ctx->Const.LineWidthGranularity = (GLfloat) LINE_WIDTH_GRANULARITY;
ctx->Const.MaxColorTableSize = MAX_COLOR_TABLE_SIZE;
ctx->Const.MaxConvolutionWidth = MAX_CONVOLUTION_WIDTH;
ctx->Const.MaxConvolutionHeight = MAX_CONVOLUTION_HEIGHT;
ctx->Const.MaxClipPlanes = MAX_CLIP_PLANES;
ctx->Const.MaxLights = MAX_LIGHTS;
ctx->Const.MaxShininess = 128.0;
ctx->Const.MaxSpotExponent = 128.0;
ctx->Const.MaxViewportWidth = MAX_WIDTH;
ctx->Const.MaxViewportHeight = MAX_HEIGHT;
#if FEATURE_ARB_vertex_program
ctx->Const.VertexProgram.MaxInstructions = MAX_NV_VERTEX_PROGRAM_INSTRUCTIONS;
ctx->Const.VertexProgram.MaxAluInstructions = 0;
ctx->Const.VertexProgram.MaxTexInstructions = 0;
ctx->Const.VertexProgram.MaxTexIndirections = 0;
ctx->Const.VertexProgram.MaxAttribs = MAX_NV_VERTEX_PROGRAM_INPUTS;
ctx->Const.VertexProgram.MaxTemps = MAX_PROGRAM_TEMPS;
ctx->Const.VertexProgram.MaxParameters = MAX_NV_VERTEX_PROGRAM_PARAMS;
ctx->Const.VertexProgram.MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
ctx->Const.VertexProgram.MaxEnvParams = MAX_PROGRAM_ENV_PARAMS;
ctx->Const.VertexProgram.MaxAddressRegs = MAX_VERTEX_PROGRAM_ADDRESS_REGS;
ctx->Const.VertexProgram.MaxUniformComponents = 4 * MAX_UNIFORMS;
init_natives(&ctx->Const.VertexProgram);
#endif
#if FEATURE_ARB_fragment_program
ctx->Const.FragmentProgram.MaxInstructions = MAX_NV_FRAGMENT_PROGRAM_INSTRUCTIONS;
ctx->Const.FragmentProgram.MaxAluInstructions = MAX_FRAGMENT_PROGRAM_ALU_INSTRUCTIONS;
ctx->Const.FragmentProgram.MaxTexInstructions = MAX_FRAGMENT_PROGRAM_TEX_INSTRUCTIONS;
ctx->Const.FragmentProgram.MaxTexIndirections = MAX_FRAGMENT_PROGRAM_TEX_INDIRECTIONS;
ctx->Const.FragmentProgram.MaxAttribs = MAX_NV_FRAGMENT_PROGRAM_INPUTS;
ctx->Const.FragmentProgram.MaxTemps = MAX_PROGRAM_TEMPS;
ctx->Const.FragmentProgram.MaxParameters = MAX_NV_FRAGMENT_PROGRAM_PARAMS;
ctx->Const.FragmentProgram.MaxLocalParams = MAX_PROGRAM_LOCAL_PARAMS;
ctx->Const.FragmentProgram.MaxEnvParams = MAX_PROGRAM_ENV_PARAMS;
ctx->Const.FragmentProgram.MaxAddressRegs = MAX_FRAGMENT_PROGRAM_ADDRESS_REGS;
ctx->Const.FragmentProgram.MaxUniformComponents = 4 * MAX_UNIFORMS;
init_natives(&ctx->Const.FragmentProgram);
#endif
ctx->Const.MaxProgramMatrices = MAX_PROGRAM_MATRICES;
ctx->Const.MaxProgramMatrixStackDepth = MAX_PROGRAM_MATRIX_STACK_DEPTH;
/* CheckArrayBounds is overriden by drivers/x11 for X server */
ctx->Const.CheckArrayBounds = GL_FALSE;
/* GL_ARB_draw_buffers */
ctx->Const.MaxDrawBuffers = MAX_DRAW_BUFFERS;
/* GL_OES_read_format */
ctx->Const.ColorReadFormat = GL_RGBA;
ctx->Const.ColorReadType = GL_UNSIGNED_BYTE;
#if FEATURE_EXT_framebuffer_object
ctx->Const.MaxColorAttachments = MAX_COLOR_ATTACHMENTS;
ctx->Const.MaxRenderbufferSize = MAX_WIDTH;
#endif
#if FEATURE_ARB_vertex_shader
ctx->Const.MaxVertexTextureImageUnits = MAX_VERTEX_TEXTURE_IMAGE_UNITS;
ctx->Const.MaxVarying = MAX_VARYING;
#endif
/* sanity checks */
ASSERT(ctx->Const.MaxTextureUnits == MIN2(ctx->Const.MaxTextureImageUnits,
ctx->Const.MaxTextureCoordUnits));
ASSERT(ctx->Const.FragmentProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
ASSERT(ctx->Const.VertexProgram.MaxLocalParams <= MAX_PROGRAM_LOCAL_PARAMS);
ASSERT(MAX_NV_FRAGMENT_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);
ASSERT(MAX_NV_VERTEX_PROGRAM_TEMPS <= MAX_PROGRAM_TEMPS);
ASSERT(MAX_NV_VERTEX_PROGRAM_INPUTS <= VERT_ATTRIB_MAX);
ASSERT(MAX_NV_VERTEX_PROGRAM_OUTPUTS <= VERT_RESULT_MAX);
}
/**
* Do some sanity checks on the limits/constants for the given context.
* Only called the first time a context is bound.
*/
static void
check_context_limits(GLcontext *ctx)
{
/* Many context limits/constants are limited by the size of
* internal arrays.
*/
assert(ctx->Const.MaxTextureImageUnits <= MAX_TEXTURE_IMAGE_UNITS);
assert(ctx->Const.MaxTextureCoordUnits <= MAX_TEXTURE_COORD_UNITS);
assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_IMAGE_UNITS);
assert(ctx->Const.MaxTextureUnits <= MAX_TEXTURE_COORD_UNITS);
assert(ctx->Const.MaxViewportWidth <= MAX_WIDTH);
assert(ctx->Const.MaxViewportHeight <= MAX_WIDTH);
/* make sure largest texture image is <= MAX_WIDTH in size */
assert((1 << (ctx->Const.MaxTextureLevels -1 )) <= MAX_WIDTH);
assert((1 << (ctx->Const.MaxCubeTextureLevels -1 )) <= MAX_WIDTH);
assert((1 << (ctx->Const.Max3DTextureLevels -1 )) <= MAX_WIDTH);
assert(ctx->Const.MaxDrawBuffers <= MAX_DRAW_BUFFERS);
/* XXX probably add more tests */
}
/**
* Initialize the attribute groups in a GL context.
*
* \param ctx GL context.
*
* Initializes all the attributes, calling the respective init*
* functions for the more complex data structures.
*/
static GLboolean
init_attrib_groups(GLcontext *ctx)
{
assert(ctx);
/* Constants */
_mesa_init_constants( ctx );
/* Extensions */
_mesa_init_extensions( ctx );
/* Attribute Groups */
_mesa_init_accum( ctx );
_mesa_init_attrib( ctx );
_mesa_init_buffer_objects( ctx );
_mesa_init_color( ctx );
_mesa_init_colortables( ctx );
_mesa_init_current( ctx );
_mesa_init_depth( ctx );
_mesa_init_debug( ctx );
_mesa_init_display_list( ctx );
_mesa_init_eval( ctx );
_mesa_init_feedback( ctx );
_mesa_init_fog( ctx );
_mesa_init_histogram( ctx );
_mesa_init_hint( ctx );
_mesa_init_line( ctx );
_mesa_init_lighting( ctx );
_mesa_init_matrix( ctx );
_mesa_init_multisample( ctx );
_mesa_init_pixel( ctx );
_mesa_init_pixelstore( ctx );
_mesa_init_point( ctx );
_mesa_init_polygon( ctx );
_mesa_init_program( ctx );
_mesa_init_query( ctx );
_mesa_init_rastpos( ctx );
_mesa_init_scissor( ctx );
_mesa_init_shader_state( ctx );
_mesa_init_stencil( ctx );
_mesa_init_transform( ctx );
_mesa_init_varray( ctx );
_mesa_init_viewport( ctx );
if (!_mesa_init_texture( ctx ))
return GL_FALSE;
_mesa_init_texture_s3tc( ctx );
_mesa_init_texture_fxt1( ctx );
/* Miscellaneous */
ctx->NewState = _NEW_ALL;
ctx->ErrorValue = (GLenum) GL_NO_ERROR;
ctx->_Facing = 0;
return GL_TRUE;
}
/**
* This is the default function we plug into all dispatch table slots
* This helps prevents a segfault when someone calls a GL function without
* first checking if the extension's supported.
*/
static int
generic_nop(void)
{
_mesa_warning(NULL, "User called no-op dispatch function (an unsupported extension function?)");
return 0;
}
/**
* Allocate and initialize a new dispatch table.
*/
static struct _glapi_table *
alloc_dispatch_table(void)
{
/* Find the larger of Mesa's dispatch table and libGL's dispatch table.
* In practice, this'll be the same for stand-alone Mesa. But for DRI
* Mesa we do this to accomodate different versions of libGL and various
* DRI drivers.
*/
GLint numEntries = MAX2(_glapi_get_dispatch_table_size(),
sizeof(struct _glapi_table) / sizeof(_glapi_proc));
struct _glapi_table *table =
(struct _glapi_table *) _mesa_malloc(numEntries * sizeof(_glapi_proc));
if (table) {
_glapi_proc *entry = (_glapi_proc *) table;
GLint i;
for (i = 0; i < numEntries; i++) {
entry[i] = (_glapi_proc) generic_nop;
}
}
return table;
}
/**
* Initialize a GLcontext struct (rendering context).
*
* This includes allocating all the other structs and arrays which hang off of
* the context by pointers.
* Note that the driver needs to pass in its dd_function_table here since
* we need to at least call driverFunctions->NewTextureObject to create the
* default texture objects.
*
* Called by _mesa_create_context().
*
* Performs the imports and exports callback tables initialization, and
* miscellaneous one-time initializations. If no shared context is supplied one
* is allocated, and increase its reference count. Setups the GL API dispatch
* tables. Initialize the TNL module. Sets the maximum Z buffer depth.
* Finally queries the \c MESA_DEBUG and \c MESA_VERBOSE environment variables
* for debug flags.
*
* \param ctx the context to initialize
* \param visual describes the visual attributes for this context
* \param share_list points to context to share textures, display lists,
* etc with, or NULL
* \param driverFunctions table of device driver functions for this context
* to use
* \param driverContext pointer to driver-specific context data
*/
GLboolean
_mesa_initialize_context(GLcontext *ctx,
const GLvisual *visual,
GLcontext *share_list,
const struct dd_function_table *driverFunctions,
void *driverContext)
{
/*ASSERT(driverContext);*/
assert(driverFunctions->NewTextureObject);
assert(driverFunctions->FreeTexImageData);
/* misc one-time initializations */
one_time_init(ctx);
ctx->Visual = *visual;
ctx->DrawBuffer = NULL;
ctx->ReadBuffer = NULL;
ctx->WinSysDrawBuffer = NULL;
ctx->WinSysReadBuffer = NULL;
/* Plug in driver functions and context pointer here.
* This is important because when we call alloc_shared_state() below
* we'll call ctx->Driver.NewTextureObject() to create the default
* textures.
*/
ctx->Driver = *driverFunctions;
ctx->DriverCtx = driverContext;
if (share_list) {
/* share state with another context */
ctx->Shared = share_list->Shared;
}
else {
/* allocate new, unshared state */
if (!alloc_shared_state( ctx )) {
return GL_FALSE;
}
}
_glthread_LOCK_MUTEX(ctx->Shared->Mutex);
ctx->Shared->RefCount++;
_glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
if (!init_attrib_groups( ctx )) {
free_shared_state(ctx, ctx->Shared);
return GL_FALSE;
}
/* setup the API dispatch tables */
ctx->Exec = alloc_dispatch_table();
ctx->Save = alloc_dispatch_table();
if (!ctx->Exec || !ctx->Save) {
free_shared_state(ctx, ctx->Shared);
if (ctx->Exec)
_mesa_free(ctx->Exec);
}
_mesa_init_exec_table(ctx->Exec);
ctx->CurrentDispatch = ctx->Exec;
#if _HAVE_FULL_GL
_mesa_init_dlist_table(ctx->Save);
_mesa_install_save_vtxfmt( ctx, &ctx->ListState.ListVtxfmt );
/* Neutral tnl module stuff */
_mesa_init_exec_vtxfmt( ctx );
ctx->TnlModule.Current = NULL;
ctx->TnlModule.SwapCount = 0;
#endif
ctx->FragmentProgram._MaintainTexEnvProgram
= (_mesa_getenv("MESA_TEX_PROG") != NULL);
ctx->FragmentProgram._UseTexEnvProgram = ctx->FragmentProgram._MaintainTexEnvProgram;
ctx->VertexProgram._MaintainTnlProgram
= (_mesa_getenv("MESA_TNL_PROG") != NULL);
if (ctx->VertexProgram._MaintainTnlProgram) {
/* this is required... */
ctx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
}
ctx->FirstTimeCurrent = GL_TRUE;
return GL_TRUE;
}
/**
* Allocate and initialize a GLcontext structure.
* Note that the driver needs to pass in its dd_function_table here since
* we need to at least call driverFunctions->NewTextureObject to initialize
* the rendering context.
*
* \param visual a GLvisual pointer (we copy the struct contents)
* \param share_list another context to share display lists with or NULL
* \param driverFunctions points to the dd_function_table into which the
* driver has plugged in all its special functions.
* \param driverCtx points to the device driver's private context state
*
* \return pointer to a new __GLcontextRec or NULL if error.
*/
GLcontext *
_mesa_create_context(const GLvisual *visual,
GLcontext *share_list,
const struct dd_function_table *driverFunctions,
void *driverContext)
{
GLcontext *ctx;
ASSERT(visual);
/*ASSERT(driverContext);*/
ctx = (GLcontext *) _mesa_calloc(sizeof(GLcontext));
if (!ctx)
return NULL;
if (_mesa_initialize_context(ctx, visual, share_list,
driverFunctions, driverContext)) {
return ctx;
}
else {
_mesa_free(ctx);
return NULL;
}
}
/**
* Free the data associated with the given context.
*
* But doesn't free the GLcontext struct itself.
*
* \sa _mesa_initialize_context() and init_attrib_groups().
*/
void
_mesa_free_context_data( GLcontext *ctx )
{
/* if we're destroying the current context, unbind it first */
if (ctx == _mesa_get_current_context()) {
_mesa_make_current(NULL, NULL, NULL);
}
else {
/* unreference WinSysDraw/Read buffers */
_mesa_unreference_framebuffer(&ctx->WinSysDrawBuffer);
_mesa_unreference_framebuffer(&ctx->WinSysReadBuffer);
_mesa_unreference_framebuffer(&ctx->DrawBuffer);
_mesa_unreference_framebuffer(&ctx->ReadBuffer);
}
_mesa_reference_vertprog(ctx, &ctx->VertexProgram.Current, NULL);
_mesa_reference_vertprog(ctx, &ctx->VertexProgram._Current, NULL);
_mesa_reference_vertprog(ctx, &ctx->VertexProgram._TnlProgram, NULL);
_mesa_reference_fragprog(ctx, &ctx->FragmentProgram.Current, NULL);
_mesa_reference_fragprog(ctx, &ctx->FragmentProgram._Current, NULL);
_mesa_reference_fragprog(ctx, &ctx->FragmentProgram._TexEnvProgram, NULL);
_mesa_free_lighting_data( ctx );
_mesa_free_eval_data( ctx );
_mesa_free_texture_data( ctx );
_mesa_free_matrix_data( ctx );
_mesa_free_viewport_data( ctx );
_mesa_free_colortables_data( ctx );
_mesa_free_program_data(ctx);
_mesa_free_shader_state(ctx);
_mesa_free_query_data(ctx);
#if FEATURE_ARB_vertex_buffer_object
_mesa_delete_buffer_object(ctx, ctx->Array.NullBufferObj);
#endif
_mesa_delete_array_object(ctx, ctx->Array.DefaultArrayObj);
/* free dispatch tables */
_mesa_free(ctx->Exec);
_mesa_free(ctx->Save);
/* Shared context state (display lists, textures, etc) */
_glthread_LOCK_MUTEX(ctx->Shared->Mutex);
ctx->Shared->RefCount--;
assert(ctx->Shared->RefCount >= 0);
_glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
if (ctx->Shared->RefCount == 0) {
/* free shared state */
free_shared_state( ctx, ctx->Shared );
}
if (ctx->Extensions.String)
_mesa_free((void *) ctx->Extensions.String);
}
/**
* Destroy a GLcontext structure.
*
* \param ctx GL context.
*
* Calls _mesa_free_context_data() and frees the GLcontext structure itself.
*/
void
_mesa_destroy_context( GLcontext *ctx )
{
if (ctx) {
_mesa_free_context_data(ctx);
_mesa_free( (void *) ctx );
}
}
#if _HAVE_FULL_GL
/**
* Copy attribute groups from one context to another.
*
* \param src source context
* \param dst destination context
* \param mask bitwise OR of GL_*_BIT flags
*
* According to the bits specified in \p mask, copies the corresponding
* attributes from \p src into \p dst. For many of the attributes a simple \c
* memcpy is not enough due to the existence of internal pointers in their data
* structures.
*/
void
_mesa_copy_context( const GLcontext *src, GLcontext *dst, GLuint mask )
{
if (mask & GL_ACCUM_BUFFER_BIT) {
/* OK to memcpy */
dst->Accum = src->Accum;
}
if (mask & GL_COLOR_BUFFER_BIT) {
/* OK to memcpy */
dst->Color = src->Color;
}
if (mask & GL_CURRENT_BIT) {
/* OK to memcpy */
dst->Current = src->Current;
}
if (mask & GL_DEPTH_BUFFER_BIT) {
/* OK to memcpy */
dst->Depth = src->Depth;
}
if (mask & GL_ENABLE_BIT) {
/* no op */
}
if (mask & GL_EVAL_BIT) {
/* OK to memcpy */
dst->Eval = src->Eval;
}
if (mask & GL_FOG_BIT) {
/* OK to memcpy */
dst->Fog = src->Fog;
}
if (mask & GL_HINT_BIT) {
/* OK to memcpy */
dst->Hint = src->Hint;
}
if (mask & GL_LIGHTING_BIT) {
GLuint i;
/* begin with memcpy */
dst->Light = src->Light;
/* fixup linked lists to prevent pointer insanity */
make_empty_list( &(dst->Light.EnabledList) );
for (i = 0; i < MAX_LIGHTS; i++) {
if (dst->Light.Light[i].Enabled) {
insert_at_tail(&(dst->Light.EnabledList), &(dst->Light.Light[i]));
}
}
}
if (mask & GL_LINE_BIT) {
/* OK to memcpy */
dst->Line = src->Line;
}
if (mask & GL_LIST_BIT) {
/* OK to memcpy */
dst->List = src->List;
}
if (mask & GL_PIXEL_MODE_BIT) {
/* OK to memcpy */
dst->Pixel = src->Pixel;
}
if (mask & GL_POINT_BIT) {
/* OK to memcpy */
dst->Point = src->Point;
}
if (mask & GL_POLYGON_BIT) {
/* OK to memcpy */
dst->Polygon = src->Polygon;
}
if (mask & GL_POLYGON_STIPPLE_BIT) {
/* Use loop instead of MEMCPY due to problem with Portland Group's
* C compiler. Reported by John Stone.
*/
GLuint i;
for (i = 0; i < 32; i++) {
dst->PolygonStipple[i] = src->PolygonStipple[i];
}
}
if (mask & GL_SCISSOR_BIT) {
/* OK to memcpy */
dst->Scissor = src->Scissor;
}
if (mask & GL_STENCIL_BUFFER_BIT) {
/* OK to memcpy */
dst->Stencil = src->Stencil;
}
if (mask & GL_TEXTURE_BIT) {
/* Cannot memcpy because of pointers */
_mesa_copy_texture_state(src, dst);
}
if (mask & GL_TRANSFORM_BIT) {
/* OK to memcpy */
dst->Transform = src->Transform;
}
if (mask & GL_VIEWPORT_BIT) {
/* Cannot use memcpy, because of pointers in GLmatrix _WindowMap */
dst->Viewport.X = src->Viewport.X;
dst->Viewport.Y = src->Viewport.Y;
dst->Viewport.Width = src->Viewport.Width;
dst->Viewport.Height = src->Viewport.Height;
dst->Viewport.Near = src->Viewport.Near;
dst->Viewport.Far = src->Viewport.Far;
_math_matrix_copy(&dst->Viewport._WindowMap, &src->Viewport._WindowMap);
}
/* XXX FIXME: Call callbacks?
*/
dst->NewState = _NEW_ALL;
}
#endif
/**
* Check if the given context can render into the given framebuffer
* by checking visual attributes.
*
* Most of these tests could go away because Mesa is now pretty flexible
* in terms of mixing rendering contexts with framebuffers. As long
* as RGB vs. CI mode agree, we're probably good.
*
* \return GL_TRUE if compatible, GL_FALSE otherwise.
*/
static GLboolean
check_compatible(const GLcontext *ctx, const GLframebuffer *buffer)
{
const GLvisual *ctxvis = &ctx->Visual;
const GLvisual *bufvis = &buffer->Visual;
if (ctxvis == bufvis)
return GL_TRUE;
if (ctxvis->rgbMode != bufvis->rgbMode)
return GL_FALSE;
#if 0
/* disabling this fixes the fgl_glxgears pbuffer demo */
if (ctxvis->doubleBufferMode && !bufvis->doubleBufferMode)
return GL_FALSE;
#endif
if (ctxvis->stereoMode && !bufvis->stereoMode)
return GL_FALSE;
if (ctxvis->haveAccumBuffer && !bufvis->haveAccumBuffer)
return GL_FALSE;
if (ctxvis->haveDepthBuffer && !bufvis->haveDepthBuffer)
return GL_FALSE;
if (ctxvis->haveStencilBuffer && !bufvis->haveStencilBuffer)
return GL_FALSE;
if (ctxvis->redMask && ctxvis->redMask != bufvis->redMask)
return GL_FALSE;
if (ctxvis->greenMask && ctxvis->greenMask != bufvis->greenMask)
return GL_FALSE;
if (ctxvis->blueMask && ctxvis->blueMask != bufvis->blueMask)
return GL_FALSE;
#if 0
/* disabled (see bug 11161) */
if (ctxvis->depthBits && ctxvis->depthBits != bufvis->depthBits)
return GL_FALSE;
#endif
if (ctxvis->stencilBits && ctxvis->stencilBits != bufvis->stencilBits)
return GL_FALSE;
return GL_TRUE;
}
/**
* Do one-time initialization for the given framebuffer. Specifically,
* ask the driver for the window's current size and update the framebuffer
* object to match.
* Really, the device driver should totally take care of this.
*/
static void
initialize_framebuffer_size(GLcontext *ctx, GLframebuffer *fb)
{
GLuint width, height;
if (ctx->Driver.GetBufferSize) {
ctx->Driver.GetBufferSize(fb, &width, &height);
if (ctx->Driver.ResizeBuffers)
ctx->Driver.ResizeBuffers(ctx, fb, width, height);
fb->Initialized = GL_TRUE;
}
}
/**
* Bind the given context to the given drawBuffer and readBuffer and
* make it the current context for the calling thread.
* We'll render into the drawBuffer and read pixels from the
* readBuffer (i.e. glRead/CopyPixels, glCopyTexImage, etc).
*
* We check that the context's and framebuffer's visuals are compatible
* and return immediately if they're not.
*
* \param newCtx the new GL context. If NULL then there will be no current GL
* context.
* \param drawBuffer the drawing framebuffer
* \param readBuffer the reading framebuffer
*/
void
_mesa_make_current( GLcontext *newCtx, GLframebuffer *drawBuffer,
GLframebuffer *readBuffer )
{
GET_CURRENT_CONTEXT(oldCtx);
if (MESA_VERBOSE & VERBOSE_API)
_mesa_debug(newCtx, "_mesa_make_current()\n");
/* Check that the context's and framebuffer's visuals are compatible.
*/
if (newCtx && drawBuffer && newCtx->WinSysDrawBuffer != drawBuffer) {
if (!check_compatible(newCtx, drawBuffer)) {
_mesa_warning(newCtx,
"MakeCurrent: incompatible visuals for context and drawbuffer");
return;
}
}
if (newCtx && readBuffer && newCtx->WinSysReadBuffer != readBuffer) {
if (!check_compatible(newCtx, readBuffer)) {
_mesa_warning(newCtx,
"MakeCurrent: incompatible visuals for context and readbuffer");
return;
}
}
/* We used to call _glapi_check_multithread() here. Now do it in drivers */
_glapi_set_context((void *) newCtx);
ASSERT(_mesa_get_current_context() == newCtx);
if (oldCtx) {
_mesa_unreference_framebuffer(&oldCtx->WinSysDrawBuffer);
_mesa_unreference_framebuffer(&oldCtx->WinSysReadBuffer);
_mesa_unreference_framebuffer(&oldCtx->DrawBuffer);
_mesa_unreference_framebuffer(&oldCtx->ReadBuffer);
}
if (!newCtx) {
_glapi_set_dispatch(NULL); /* none current */
}
else {
_glapi_set_dispatch(newCtx->CurrentDispatch);
if (drawBuffer && readBuffer) {
/* TODO: check if newCtx and buffer's visual match??? */
ASSERT(drawBuffer->Name == 0);
ASSERT(readBuffer->Name == 0);
_mesa_reference_framebuffer(&newCtx->WinSysDrawBuffer, drawBuffer);
_mesa_reference_framebuffer(&newCtx->WinSysReadBuffer, readBuffer);
/*
* Only set the context's Draw/ReadBuffer fields if they're NULL
* or not bound to a user-created FBO.
*/
if (!newCtx->DrawBuffer || newCtx->DrawBuffer->Name == 0) {
/* fix up the fb fields - these will end up wrong otherwise
* if the DRIdrawable changes, and everything relies on them.
* This is a bit messy (same as needed in _mesa_BindFramebufferEXT)
*/
unsigned int i;
GLenum buffers[MAX_DRAW_BUFFERS];
_mesa_reference_framebuffer(&newCtx->DrawBuffer, drawBuffer);
for(i = 0; i < newCtx->Const.MaxDrawBuffers; i++) {
buffers[i] = newCtx->Color.DrawBuffer[i];
}
_mesa_drawbuffers(newCtx, newCtx->Const.MaxDrawBuffers, buffers, NULL);
}
if (!newCtx->ReadBuffer || newCtx->ReadBuffer->Name == 0) {
_mesa_reference_framebuffer(&newCtx->ReadBuffer, readBuffer);
_mesa_readbuffer_update_fields(newCtx, newCtx->Pixel.ReadBuffer);
}
newCtx->NewState |= _NEW_BUFFERS;
#if 1
/* We want to get rid of these lines: */
#if _HAVE_FULL_GL
if (!drawBuffer->Initialized) {
initialize_framebuffer_size(newCtx, drawBuffer);
}
if (readBuffer != drawBuffer && !readBuffer->Initialized) {
initialize_framebuffer_size(newCtx, readBuffer);
}
_mesa_resizebuffers(newCtx);
#endif
#else
/* We want the drawBuffer and readBuffer to be initialized by
* the driver.
* This generally means the Width and Height match the actual
* window size and the renderbuffers (both hardware and software
* based) are allocated to match. The later can generally be
* done with a call to _mesa_resize_framebuffer().
*
* It's theoretically possible for a buffer to have zero width
* or height, but for now, assert check that the driver did what's
* expected of it.
*/
ASSERT(drawBuffer->Width > 0);
ASSERT(drawBuffer->Height > 0);
#endif
if (newCtx->FirstTimeCurrent) {
/* set initial viewport and scissor size now */
_mesa_set_viewport(newCtx, 0, 0,
drawBuffer->Width, drawBuffer->Height);
_mesa_set_scissor(newCtx, 0, 0,
drawBuffer->Width, drawBuffer->Height );
check_context_limits(newCtx);
}
}
/* We can use this to help debug user's problems. Tell them to set
* the MESA_INFO env variable before running their app. Then the
* first time each context is made current we'll print some useful
* information.
*/
if (newCtx->FirstTimeCurrent) {
if (_mesa_getenv("MESA_INFO")) {
_mesa_print_info();
}
newCtx->FirstTimeCurrent = GL_FALSE;
}
}
}
/**
* Make context 'ctx' share the display lists, textures and programs
* that are associated with 'ctxToShare'.
* Any display lists, textures or programs associated with 'ctx' will
* be deleted if nobody else is sharing them.
*/
GLboolean
_mesa_share_state(GLcontext *ctx, GLcontext *ctxToShare)
{
if (ctx && ctxToShare && ctx->Shared && ctxToShare->Shared) {
ctx->Shared->RefCount--;
if (ctx->Shared->RefCount == 0) {
free_shared_state(ctx, ctx->Shared);
}
ctx->Shared = ctxToShare->Shared;
ctx->Shared->RefCount++;
return GL_TRUE;
}
else {
return GL_FALSE;
}
}
/**
* \return pointer to the current GL context for this thread.
*
* Calls _glapi_get_context(). This isn't the fastest way to get the current
* context. If you need speed, see the #GET_CURRENT_CONTEXT macro in
* context.h.
*/
GLcontext *
_mesa_get_current_context( void )
{
return (GLcontext *) _glapi_get_context();
}
/**
* Get context's current API dispatch table.
*
* It'll either be the immediate-mode execute dispatcher or the display list
* compile dispatcher.
*
* \param ctx GL context.
*
* \return pointer to dispatch_table.
*
* Simply returns __GLcontextRec::CurrentDispatch.
*/
struct _glapi_table *
_mesa_get_dispatch(GLcontext *ctx)
{
return ctx->CurrentDispatch;
}
/*@}*/
/**********************************************************************/
/** \name Miscellaneous functions */
/**********************************************************************/
/*@{*/
/**
* Record an error.
*
* \param ctx GL context.
* \param error error code.
*
* Records the given error code and call the driver's dd_function_table::Error
* function if defined.
*
* \sa
* This is called via _mesa_error().
*/
void
_mesa_record_error(GLcontext *ctx, GLenum error)
{
if (!ctx)
return;
if (ctx->ErrorValue == GL_NO_ERROR) {
ctx->ErrorValue = error;
}
/* Call device driver's error handler, if any. This is used on the Mac. */
if (ctx->Driver.Error) {
ctx->Driver.Error(ctx);
}
}
/**
* Execute glFinish().
*
* Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
* dd_function_table::Finish driver callback, if not NULL.
*/
void GLAPIENTRY
_mesa_Finish(void)
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
if (ctx->Driver.Finish) {
ctx->Driver.Finish(ctx);
}
}
/**
* Execute glFlush().
*
* Calls the #ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH macro and the
* dd_function_table::Flush driver callback, if not NULL.
*/
void GLAPIENTRY
_mesa_Flush(void)
{
GET_CURRENT_CONTEXT(ctx);
ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
if (ctx->Driver.Flush) {
ctx->Driver.Flush(ctx);
}
}
/*@}*/