texobj.c

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

   /* Always need the base level image */
   if (!t->Image[0][baseLevel]) {
      char s[100];
      _mesa_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) ||
       (t->Target == GL_TEXTURE_1D_ARRAY_EXT)) {
      maxLog2 = t->Image[0][baseLevel]->WidthLog2;
      maxLevels = ctx->Const.MaxTextureLevels;
   }
   else if ((t->Target == GL_TEXTURE_2D) ||
	    (t->Target == GL_TEXTURE_2D_ARRAY_EXT)) {
      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;
	 }
      }
   }

   /* 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) {
         t->_Complete = GL_FALSE;
         incomplete(t, "minLevel > maxLevel");
         return;
      }

      /* Test dimension-independent attributes */
      for (i = minLevel; i <= maxLevel; i++) {
         if (t->Image[0][i]) {
            if (t->Image[0][i]->TexFormat != t->Image[0][baseLevel]->TexFormat) {
               t->_Complete = GL_FALSE;
               incomplete(t, "Format[i] != Format[baseLevel]");
               return;
            }
            if (t->Image[0][i]->Border != t->Image[0][baseLevel]->Border) {
               t->_Complete = GL_FALSE;
               incomplete(t, "Border[i] != Border[baseLevel]");
               return;
            }
         }
      }

      /* Test things which depend on number of texture image dimensions */
      if ((t->Target == GL_TEXTURE_1D) ||
          (t->Target == GL_TEXTURE_1D_ARRAY_EXT)) {
         /* Test 1-D mipmaps */
         GLuint width = t->Image[0][baseLevel]->Width2;
         for (i = baseLevel + 1; i < maxLevels; i++) {
            if (width > 1) {
               width /= 2;
            }
            if (i >= minLevel && i <= maxLevel) {
               if (!t->Image[0][i]) {
                  t->_Complete = GL_FALSE;
                  incomplete(t, "1D Image[0][i] == NULL");
                  return;
               }
               if (t->Image[0][i]->Width2 != width ) {
                  t->_Complete = GL_FALSE;
                  incomplete(t, "1D Image[0][i] bad width");
                  return;
               }
            }
            if (width == 1) {
               return;  /* found smallest needed mipmap, all done! */
            }
         }
      }
      else if ((t->Target == GL_TEXTURE_2D) ||
               (t->Target == GL_TEXTURE_2D_ARRAY_EXT)) {
         /* Test 2-D mipmaps */
         GLuint width = t->Image[0][baseLevel]->Width2;
         GLuint height = t->Image[0][baseLevel]->Height2;
         for (i = baseLevel + 1; i < maxLevels; i++) {
            if (width > 1) {
               width /= 2;
            }
            if (height > 1) {
               height /= 2;
            }
            if (i >= minLevel && i <= maxLevel) {
               if (!t->Image[0][i]) {
                  t->_Complete = GL_FALSE;
                  incomplete(t, "2D Image[0][i] == NULL");
                  return;
               }
               if (t->Image[0][i]->Width2 != width) {
                  t->_Complete = GL_FALSE;
                  incomplete(t, "2D Image[0][i] bad width");
                  return;
               }
               if (t->Image[0][i]->Height2 != height) {
                  t->_Complete = GL_FALSE;
                  incomplete(t, "2D Image[0][i] bad height");
                  return;
               }
               if (width==1 && height==1) {
                  return;  /* found smallest needed mipmap, all done! */
               }
            }
         }
      }
      else if (t->Target == GL_TEXTURE_3D) {
         /* Test 3-D mipmaps */
         GLuint width = t->Image[0][baseLevel]->Width2;
         GLuint height = t->Image[0][baseLevel]->Height2;
         GLuint depth = t->Image[0][baseLevel]->Depth2;
	 for (i = baseLevel + 1; i < maxLevels; i++) {
            if (width > 1) {
               width /= 2;
            }
            if (height > 1) {
               height /= 2;
            }
            if (depth > 1) {
               depth /= 2;
            }
            if (i >= minLevel && i <= maxLevel) {
               if (!t->Image[0][i]) {
                  incomplete(t, "3D Image[0][i] == NULL");
                  t->_Complete = GL_FALSE;
                  return;
               }
               if (t->Image[0][i]->_BaseFormat == GL_DEPTH_COMPONENT) {
                  t->_Complete = GL_FALSE;
                  incomplete(t, "GL_DEPTH_COMPONENT only works with 1/2D tex");
                  return;
               }
               if (t->Image[0][i]->Width2 != width) {
                  t->_Complete = GL_FALSE;
                  incomplete(t, "3D Image[0][i] bad width");
                  return;
               }
               if (t->Image[0][i]->Height2 != height) {
                  t->_Complete = GL_FALSE;
                  incomplete(t, "3D Image[0][i] bad height");
                  return;
               }
               if (t->Image[0][i]->Depth2 != depth) {
                  t->_Complete = GL_FALSE;
                  incomplete(t, "3D Image[0][i] bad depth");
                  return;
               }
            }
            if (width == 1 && height == 1 && depth == 1) {
               return;  /* found smallest needed mipmap, all done! */
            }
         }
      }
      else if (t->Target == GL_TEXTURE_CUBE_MAP_ARB) {
         /* make sure 6 cube faces are consistant */
         GLuint width = t->Image[0][baseLevel]->Width2;
         GLuint height = t->Image[0][baseLevel]->Height2;
	 for (i = baseLevel + 1; i < maxLevels; i++) {
            if (width > 1) {
               width /= 2;
            }
            if (height > 1) {
               height /= 2;
            }
            if (i >= minLevel && i <= maxLevel) {
	       GLuint face;
	       for (face = 0; face < 6; face++) {
		  /* check that we have images defined */
		  if (!t->Image[face][i]) {
		     t->_Complete = GL_FALSE;
		     incomplete(t, "CubeMap Image[n][i] == NULL");
		     return;
		  }
		  /* Don't support GL_DEPTH_COMPONENT for cube maps */
		  if (t->Image[face][i]->_BaseFormat == GL_DEPTH_COMPONENT) {
		     t->_Complete = GL_FALSE;
		     incomplete(t, "GL_DEPTH_COMPONENT only works with 1/2D tex");
		     return;
		  }
		  /* check that all six images have same size */
		  if (t->Image[face][i]->Width2!=width || 
		      t->Image[face][i]->Height2!=height) {
		     t->_Complete = GL_FALSE;
		     incomplete(t, "CubeMap Image[n][i] bad size");
		     return;
		  }
	       }
	    }
	    if (width == 1 && height == 1) {
	       return;  /* found smallest needed mipmap, all done! */
            }
         }
      }
      else if (t->Target == GL_TEXTURE_RECTANGLE_NV) {
         /* XXX special checking? */
      }
      else {
         /* Target = ??? */
         _mesa_problem(ctx, "Bug in gl_test_texture_object_completeness\n");
      }
   }
}

/*@}*/


/***********************************************************************/
/** \name API functions */
/*@{*/


/**
 * Generate texture names.
 *
 * \param n number of texture names to be generated.
 * \param textures an array in which will hold the generated texture names.
 *
 * \sa glGenTextures().
 *
 * Calls _mesa_HashFindFreeKeyBlock() to find a block of free texture
 * IDs which are stored in \p textures.  Corresponding empty texture
 * objects are also generated.
 */ 
void GLAPIENTRY
_mesa_GenTextures( GLsizei n, GLuint *textures )
{
   GET_CURRENT_CONTEXT(ctx);
   GLuint first;
   GLint i;
   ASSERT_OUTSIDE_BEGIN_END(ctx);

   if (n < 0) {
      _mesa_error( ctx, GL_INVALID_VALUE, "glGenTextures" );
      return;
   }

   if (!textures)
      return;

   /*
    * This must be atomic (generation and allocation of texture IDs)
    */
   _glthread_LOCK_MUTEX(ctx->Shared->Mutex);

   first = _mesa_HashFindFreeKeyBlock(ctx->Shared->TexObjects, n);

   /* Allocate new, empty texture objects */
   for (i = 0; i < n; i++) {
      struct gl_texture_object *texObj;
      GLuint name = first + i;
      GLenum target = 0;
      texObj = (*ctx->Driver.NewTextureObject)( ctx, name, target);
      if (!texObj) {
         _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
         _mesa_error(ctx, GL_OUT_OF_MEMORY, "glGenTextures");
         return;
      }

      /* insert into hash table */
      _mesa_HashInsert(ctx->Shared->TexObjects, texObj->Name, texObj);

      textures[i] = name;
   }

   _glthread_UNLOCK_MUTEX(ctx->Shared->Mutex);
}


/**
 * Check if the given texture object is bound to the current draw or
 * read framebuffer.  If so, Unbind it.
 */
static void
unbind_texobj_from_fbo(GLcontext *ctx, struct gl_texture_object *texObj)
{
   const GLuint n = (ctx->DrawBuffer == ctx->ReadBuffer) ? 1 : 2;
   GLuint i;

   for (i = 0; i < n; i++) {
      struct gl_framebuffer *fb = (i == 0) ? ctx->DrawBuffer : ctx->ReadBuffer;
      if (fb->Name) {
         GLuint j;
         for (j = 0; j < BUFFER_COUNT; j++) {
            if (fb->Attachment[j].Type == GL_TEXTURE &&
                fb->Attachment[j].Texture == texObj) {
               _mesa_remove_attachment(ctx, fb->Attachment + j);         
            }
         }
      }
   }
}


/**
 * Check if the given texture object is bound to any texture image units and
 * unbind it if so (revert to default textures).
 */
static void
unbind_texobj_from_texunits(GLcontext *ctx, struct gl_texture_object *texObj)
{
   GLuint u;

   for (u = 0; u < MAX_TEXTURE_IMAGE_UNITS; u++) {
      struct gl_texture_unit *unit = &ctx->Texture.Unit[u];
      if (texObj == unit->Current1D) {
         _mesa_reference_texobj(&unit->Current1D, ctx->Shared->Default1D);
      }
      else if (texObj == unit->Current2D) {
         _mesa_reference_texobj(&unit->Current2D, ctx->Shared->Default2D);
      }
      else if (texObj == unit->Current3D) {
         _mesa_reference_texobj(&unit->Current3D, ctx->Shared->Default3D);
      }
      else if (texObj == unit->CurrentCubeMap) {
         _mesa_reference_texobj(&unit->CurrentCubeMap, ctx->Shared->DefaultCubeMap);
      }
      else if (texObj == unit->CurrentRect) {
         _mesa_reference_texobj(&unit->CurrentRect, ctx->Shared->DefaultRect);