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

/*
 * Mesa 3-D graphics library
 *
 * 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
 * THE AUTHORS OR COPYRIGHT HOLDERS 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.
 */


#ifndef TEXTOBJ_H
#define TEXTOBJ_H


#include "compiler.h"
#include "glheader.h"
#include "mtypes.h"
#include "samplerobj.h"


#ifdef __cplusplus
extern "C" {
#endif


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

extern struct gl_texture_object *
_mesa_lookup_texture(struct gl_context *ctx, GLuint id);

extern struct gl_texture_object *
_mesa_lookup_texture_err(struct gl_context *ctx, GLuint id, const char* func);

extern void
_mesa_begin_texture_lookups(struct gl_context *ctx);

extern void
_mesa_end_texture_lookups(struct gl_context *ctx);

extern struct gl_texture_object *
_mesa_lookup_texture_locked(struct gl_context *ctx, GLuint id);

extern struct gl_texture_object *
_mesa_get_current_tex_object(struct gl_context *ctx, GLenum target);

extern struct gl_texture_object *
_mesa_new_texture_object( struct gl_context *ctx, GLuint name, GLenum target );

extern void
_mesa_initialize_texture_object( struct gl_context *ctx,
                                 struct gl_texture_object *obj,
                                 GLuint name, GLenum target );

extern int
_mesa_tex_target_to_index(const struct gl_context *ctx, GLenum target);

extern void
_mesa_delete_texture_object( struct gl_context *ctx,
                             struct gl_texture_object *obj );

extern void
_mesa_copy_texture_object( struct gl_texture_object *dest,
                           const struct gl_texture_object *src );

extern void
_mesa_clear_texture_object(struct gl_context *ctx,
                           struct gl_texture_object *obj);

extern void
_mesa_reference_texobj_(struct gl_texture_object **ptr,
                        struct gl_texture_object *tex);

static inline void
_mesa_reference_texobj(struct gl_texture_object **ptr,
                       struct gl_texture_object *tex)
{
   if (*ptr != tex)
      _mesa_reference_texobj_(ptr, tex);
}

/**
 * Lock a texture for updating.  See also _mesa_lock_context_textures().
 */
static inline void
_mesa_lock_texture(struct gl_context *ctx, struct gl_texture_object *texObj)
{
   mtx_lock(&ctx->Shared->TexMutex);
   ctx->Shared->TextureStateStamp++;
   (void) texObj;
}

static inline void
_mesa_unlock_texture(struct gl_context *ctx, struct gl_texture_object *texObj)
{
   (void) texObj;
   mtx_unlock(&ctx->Shared->TexMutex);
}


/**
 * Return number of faces for a texture target.  This will be 6 for
 * cube maps (and cube map arrays) and 1 otherwise.
 * NOTE: this function is not used for cube map arrays which operate
 * more like 2D arrays than cube maps.
 */
static inline GLuint
_mesa_num_tex_faces(GLenum target)
{
   switch (target) {
   case GL_TEXTURE_CUBE_MAP:
   case GL_PROXY_TEXTURE_CUBE_MAP:
      return 6;
   default:
      return 1;
   }
}


/** Is the texture "complete" with respect to the given sampler state? */
static inline GLboolean
_mesa_is_texture_complete(const struct gl_texture_object *texObj,
                          const struct gl_sampler_object *sampler)
{
   if (texObj->_IsIntegerFormat &&
       (sampler->MagFilter != GL_NEAREST ||
        (sampler->MinFilter != GL_NEAREST &&
         sampler->MinFilter != GL_NEAREST_MIPMAP_NEAREST))) {
      /* If the format is integer, only nearest filtering is allowed */
      return GL_FALSE;
   }

   /* From the ARB_stencil_texturing specification:
    * "Add a new bullet point for the conditions that cause the texture
    *  to not be complete:
    *
    *  * The internal format of the texture is DEPTH_STENCIL, the
    *    DEPTH_STENCIL_TEXTURE_MODE for the texture is STENCIL_INDEX and either
    *    the magnification filter or the minification filter is not NEAREST."
    */
   if (texObj->StencilSampling &&
       texObj->Image[0][texObj->BaseLevel]->_BaseFormat == GL_DEPTH_STENCIL &&
       (sampler->MagFilter != GL_NEAREST || sampler->MinFilter != GL_NEAREST)) {
      return GL_FALSE;
   }

   if (_mesa_is_mipmap_filter(sampler))
      return texObj->_MipmapComplete;
   else
      return texObj->_BaseComplete;
}


extern void
_mesa_test_texobj_completeness( const struct gl_context *ctx,
                                struct gl_texture_object *obj );

extern GLboolean
_mesa_cube_level_complete(const struct gl_texture_object *texObj,
                          const GLint level);

extern GLboolean
_mesa_cube_complete(const struct gl_texture_object *texObj);

extern void
_mesa_dirty_texobj(struct gl_context *ctx, struct gl_texture_object *texObj);

extern struct gl_texture_object *
_mesa_get_fallback_texture(struct gl_context *ctx, gl_texture_index tex);

extern GLuint
_mesa_total_texture_memory(struct gl_context *ctx);

extern GLenum
_mesa_texture_base_format(const struct gl_texture_object *texObj);

extern void
_mesa_unlock_context_textures( struct gl_context *ctx );

extern void
_mesa_lock_context_textures( struct gl_context *ctx );

extern void
_mesa_delete_nameless_texture(struct gl_context *ctx,
                              struct gl_texture_object *texObj);


/*@}*/

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

extern void GLAPIENTRY
_mesa_GenTextures(GLsizei n, GLuint *textures);

extern void GLAPIENTRY
_mesa_CreateTextures(GLenum target, GLsizei n, GLuint *textures);

extern void GLAPIENTRY
_mesa_DeleteTextures( GLsizei n, const GLuint *textures );


extern void GLAPIENTRY
_mesa_BindTexture( GLenum target, GLuint texture );

extern void GLAPIENTRY
_mesa_BindTextureUnit(GLuint unit, GLuint texture);

extern void GLAPIENTRY
_mesa_BindTextures( GLuint first, GLsizei count, const GLuint *textures );


extern void GLAPIENTRY
_mesa_PrioritizeTextures( GLsizei n, const GLuint *textures,
                          const GLclampf *priorities );


extern GLboolean GLAPIENTRY
_mesa_AreTexturesResident( GLsizei n, const GLuint *textures,
                           GLboolean *residences );

extern GLboolean GLAPIENTRY
_mesa_IsTexture( GLuint texture );

extern void GLAPIENTRY
_mesa_InvalidateTexSubImage(GLuint texture, GLint level, GLint xoffset,
                            GLint yoffset, GLint zoffset, GLsizei width,
                            GLsizei height, GLsizei depth);

extern void GLAPIENTRY
_mesa_InvalidateTexImage(GLuint texture, GLint level);

/*@}*/


#ifdef __cplusplus
}
#endif


#endif