texobj.c

winNT技术操作系统,国外开放的原代码和LIUX一样

/**
 * \file texobj.c
 * Texture object management.
 */

/*
 * Mesa 3-D graphics library
 * Version:  6.3
 *
 * Copyright (C) 1999-2005  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.
 */


#include "glheader.h"
#include "colortab.h"
#include "context.h"
#include "enums.h"
#include "hash.h"
#include "imports.h"
#include "macros.h"
#include "teximage.h"
#include "texstate.h"
#include "texobj.h"
#include "mtypes.h"


/**********************************************************************/
/** \name Internal functions */
/*@{*/

/**
 * Allocate and initialize a new texture object.  But don't put it into the
 * texture object hash table.
 *
 * Called via ctx->Driver.NewTextureObject, unless overridden by a device
 * driver.
 * 
 * \param shared the shared GL state structure to contain the texture object
 * \param name integer name for the texture object
 * \param target either GL_TEXTURE_1D, GL_TEXTURE_2D, GL_TEXTURE_3D,
 * GL_TEXTURE_CUBE_MAP_ARB or GL_TEXTURE_RECTANGLE_NV.  zero is ok for the sake
 * of GenTextures()
 *
 * \return pointer to new texture object.
 */
struct gl_texture_object *
_mesa_new_texture_object( GLcontext *ctx, GLuint name, GLenum target )
{
   struct gl_texture_object *obj;
   (void) ctx;
   obj = MALLOC_STRUCT(gl_texture_object);
   _mesa_initialize_texture_object(obj, name, target);
   return obj;
}


/**
 * Initialize a new texture object to default values.
 * \param obj  the texture object
 * \param name  the texture name
 * \param target  the texture target
 */
void
_mesa_initialize_texture_object( struct gl_texture_object *obj,
                                 GLuint name, GLenum target )
{
   ASSERT(target == 0 ||
          target == GL_TEXTURE_1D ||
          target == GL_TEXTURE_2D ||
          target == GL_TEXTURE_3D ||
          target == GL_TEXTURE_CUBE_MAP_ARB ||
          target == GL_TEXTURE_RECTANGLE_NV);

   _mesa_bzero(obj, sizeof(*obj));
   /* init the non-zero fields */
   _glthread_INIT_MUTEX(obj->Mutex);
   obj->RefCount = 1;
   obj->Name = name;
   obj->Target = target;
   obj->Priority = 1.0F;
   if (target == GL_TEXTURE_RECTANGLE_NV) {
      obj->WrapS = GL_CLAMP_TO_EDGE;
      obj->WrapT = GL_CLAMP_TO_EDGE;
      obj->WrapR = GL_CLAMP_TO_EDGE;
      obj->MinFilter = GL_LINEAR;
   }
   else {
      obj->WrapS = GL_REPEAT;
      obj->WrapT = GL_REPEAT;
      obj->WrapR = GL_REPEAT;
      obj->MinFilter = GL_NEAREST_MIPMAP_LINEAR;
   }
   obj->MagFilter = GL_LINEAR;
   obj->MinLod = -1000.0;
   obj->MaxLod = 1000.0;
   obj->LodBias = 0.0;
   obj->BaseLevel = 0;
   obj->MaxLevel = 1000;
   obj->MaxAnisotropy = 1.0;
   obj->CompareFlag = GL_FALSE;                      /* SGIX_shadow */
   obj->CompareOperator = GL_TEXTURE_LEQUAL_R_SGIX;  /* SGIX_shadow */
   obj->CompareMode = GL_NONE;         /* ARB_shadow */
   obj->CompareFunc = GL_LEQUAL;       /* ARB_shadow */
   obj->DepthMode = GL_LUMINANCE;      /* ARB_depth_texture */
   obj->ShadowAmbient = 0.0F;          /* ARB/SGIX_shadow_ambient */
   _mesa_init_colortable(&obj->Palette);
}


/**
 * Deallocate a texture object struct.  It should have already been
 * removed from the texture object pool.
 *
 * \param shared the shared GL state to which the object belongs.
 * \param texOjb the texture object to delete.
 */
void
_mesa_delete_texture_object( GLcontext *ctx, struct gl_texture_object *texObj )
{
   GLuint i, face;

   (void) ctx;

   _mesa_free_colortable_data(&texObj->Palette);

   /* free the texture images */
   for (face = 0; face < 6; face++) {
      for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
	 if (texObj->Image[face][i]) {
	    _mesa_delete_texture_image( ctx, texObj->Image[face][i] );
	 }
      }
   }

   /* destroy the mutex -- it may have allocated memory (eg on bsd) */
   _glthread_DESTROY_MUTEX(texObj->Mutex);

   /* free this object */
   _mesa_free(texObj);
}




/**
 * Copy texture object state from one texture object to another.
 * Use for glPush/PopAttrib.
 *
 * \param dest destination texture object.
 * \param src source texture object.
 */
void
_mesa_copy_texture_object( struct gl_texture_object *dest,
                           const struct gl_texture_object *src )
{
   dest->Name = src->Name;
   dest->Priority = src->Priority;
   dest->BorderColor[0] = src->BorderColor[0];
   dest->BorderColor[1] = src->BorderColor[1];
   dest->BorderColor[2] = src->BorderColor[2];
   dest->BorderColor[3] = src->BorderColor[3];
   dest->WrapS = src->WrapS;
   dest->WrapT = src->WrapT;
   dest->WrapR = src->WrapR;
   dest->MinFilter = src->MinFilter;
   dest->MagFilter = src->MagFilter;
   dest->MinLod = src->MinLod;
   dest->MaxLod = src->MaxLod;
   dest->LodBias = src->LodBias;
   dest->BaseLevel = src->BaseLevel;
   dest->MaxLevel = src->MaxLevel;
   dest->MaxAnisotropy = src->MaxAnisotropy;
   dest->CompareFlag = src->CompareFlag;
   dest->CompareOperator = src->CompareOperator;
   dest->ShadowAmbient = src->ShadowAmbient;
   dest->CompareMode = src->CompareMode;
   dest->CompareFunc = src->CompareFunc;
   dest->DepthMode = src->DepthMode;
   dest->_MaxLevel = src->_MaxLevel;
   dest->_MaxLambda = src->_MaxLambda;
   dest->GenerateMipmap = src->GenerateMipmap;
   dest->Palette = src->Palette;
   dest->Complete = src->Complete;
   dest->_IsPowerOfTwo = src->_IsPowerOfTwo;
}


/**
 * Report why a texture object is incomplete.  
 *
 * \param t texture object.
 * \param why string describing why it's incomplete.
 *
 * \note For debug purposes only.
 */
#if 0
static void
incomplete(const struct gl_texture_object *t, const char *why)
{
   _mesa_printf("Texture Obj %d incomplete because: %s\n", t->Name, why);
}
#else
#define incomplete(t, why)
#endif


/**
 * Examine a texture object to determine if it is complete.
 *
 * The gl_texture_object::Complete flag will be set to GL_TRUE or GL_FALSE
 * accordingly.
 *
 * \param ctx GL context.
 * \param t texture object.
 *
 * According to the texture target, verifies that each of the mipmaps is
 * present and has the expected size.
 */
void
_mesa_test_texobj_completeness( const GLcontext *ctx,
                                struct gl_texture_object *t )
{
   const GLint baseLevel = t->BaseLevel;
   GLint maxLog2 = 0, maxLevels = 0;

   t->Complete = GL_TRUE;  /* be optimistic */
   t->_IsPowerOfTwo = GL_TRUE;  /* may be set FALSE below */

   /* Always need the base level image */
   if (!t->Image[0][baseLevel]) {
      char s[100];
      sprintf(s, "obj %p (%d) Image[baseLevel=%d] == NULL",
              (void *) t, t->Name, baseLevel);
      incomplete(t, s);
      t->Complete = GL_FALSE;
      return;
   }

   /* Check width/height/depth for zero */
   if (t->Image[0][baseLevel]->Width == 0 ||
       t->Image[0][baseLevel]->Height == 0 ||
       t->Image[0][baseLevel]->Depth == 0) {
      incomplete(t, "texture width = 0");
      t->Complete = GL_FALSE;
      return;
   }

   /* Compute _MaxLevel */
   if (t->Target == GL_TEXTURE_1D) {
      maxLog2 = t->Image[0][baseLevel]->WidthLog2;
      maxLevels = ctx->Const.MaxTextureLevels;
   }
   else if (t->Target == GL_TEXTURE_2D) {
      maxLog2 = MAX2(t->Image[0][baseLevel]->WidthLog2,
                     t->Image[0][baseLevel]->HeightLog2);
      maxLevels = ctx->Const.MaxTextureLevels;
   }
   else if (t->Target == GL_TEXTURE_3D) {
      GLint max = MAX2(t->Image[0][baseLevel]->WidthLog2,
                       t->Image[0][baseLevel]->HeightLog2);
      maxLog2 = MAX2(max, (GLint)(t->Image[0][baseLevel]->DepthLog2));
      maxLevels = ctx->Const.Max3DTextureLevels;
   }
   else if (t->Target == GL_TEXTURE_CUBE_MAP_ARB) {
      maxLog2 = MAX2(t->Image[0][baseLevel]->WidthLog2,
                     t->Image[0][baseLevel]->HeightLog2);
      maxLevels = ctx->Const.MaxCubeTextureLevels;
   }
   else if (t->Target == GL_TEXTURE_RECTANGLE_NV) {
      maxLog2 = 0;  /* not applicable */
      maxLevels = 1;  /* no mipmapping */
   }
   else {
      _mesa_problem(ctx, "Bad t->Target in _mesa_test_texobj_completeness");
      return;
   }

   ASSERT(maxLevels > 0);

   t->_MaxLevel = baseLevel + maxLog2;
   t->_MaxLevel = MIN2(t->_MaxLevel, t->MaxLevel);
   t->_MaxLevel = MIN2(t->_MaxLevel, maxLevels - 1);

   /* Compute _MaxLambda = q - b (see the 1.2 spec) used during mipmapping */
   t->_MaxLambda = (GLfloat) (t->_MaxLevel - t->BaseLevel);

   if (t->Target == GL_TEXTURE_CUBE_MAP_ARB) {
      /* make sure that all six cube map level 0 images are the same size */
      const GLuint w = t->Image[0][baseLevel]->Width2;
      const GLuint h = t->Image[0][baseLevel]->Height2;
      GLuint face;
      for (face = 1; face < 6; face++) {
	 if (t->Image[face][baseLevel] == NULL ||
	     t->Image[face][baseLevel]->Width2 != w ||
	     t->Image[face][baseLevel]->Height2 != h) {
	    t->Complete = GL_FALSE;
	    incomplete(t, "Non-quare cubemap image");
	    return;
	 }
      }
   }

   /* check for non power of two */
   if (!t->Image[0][baseLevel]->_IsPowerOfTwo) {
      t->_IsPowerOfTwo = GL_FALSE;
   }

   /* extra checking for mipmaps */
   if (t->MinFilter != GL_NEAREST && t->MinFilter != GL_LINEAR) {
      /*
       * Mipmapping: determine if we have a complete set of mipmaps
       */
      GLint i;
      GLint minLevel = baseLevel;
      GLint maxLevel = t->_MaxLevel;

      if (minLevel > maxLevel) {