context.c

来自「Mesa is an open-source implementation of」· C语言 代码 · 共 1,776 行 · 第 1/4 页

#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;

   /* sanity check */
   assert(ss->Default1D->RefCount == 1);

   _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);
   }
}

/**
 * Callback for deleting a framebuffer object.  Called by _mesa_HashDeleteAll()
 */
static void
delete_framebuffer_cb(GLuint id, void *data, void *userData)
{
   struct gl_framebuffer *fb = (struct gl_framebuffer *) data;
   /* The fact that the framebuffer is in the hashtable means its refcount
    * is one, but we're removing from the hashtable now.  So clear refcount.
    */
   /*assert(fb->RefCount == 1);*/
   fb->RefCount = 0;

   /* NOTE: Delete should always be defined but there are two reports
    * of it being NULL (bugs 13507, 14293).  Work-around for now.
    */
   if (fb->Delete)
      fb->Delete(fb);
}

/**
 * Callback for deleting a renderbuffer object. Called by _mesa_HashDeleteAll()
 */
static void
delete_renderbuffer_cb(GLuint id, void *data, void *userData)
{
   struct gl_renderbuffer *rb = (struct gl_renderbuffer *) data;
   rb->RefCount = 0;  /* see comment for FBOs above */
   if (rb->Delete)
      rb->Delete(rb);
}



/**
 * 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_HashDeleteAll(ss->FrameBuffers, delete_framebuffer_cb, ctx);
   _mesa_DeleteHashTable(ss->FrameBuffers);
   _mesa_HashDeleteAll(ss->RenderBuffers, delete_renderbuffer_cb, ctx);
   _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, 0.0 );
   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;