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/**
* \file texstate.h
* Texture state management.
*/
/*
* Mesa 3-D graphics library
*
* Copyright (C) 1999-2007 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 TEXSTATE_H
#define TEXSTATE_H
#include "compiler.h"
#include "enums.h"
#include "macros.h"
#include "mtypes.h"
static inline struct gl_texture_unit *
_mesa_get_tex_unit(struct gl_context *ctx, GLuint unit)
{
ASSERT(unit >= 0);
ASSERT(unit < Elements(ctx->Texture.Unit));
return &(ctx->Texture.Unit[unit]);
}
/**
* Return pointer to current texture unit.
* This the texture unit set by glActiveTexture(), not glClientActiveTexture().
*/
static inline struct gl_texture_unit *
_mesa_get_current_tex_unit(struct gl_context *ctx)
{
return _mesa_get_tex_unit(ctx, ctx->Texture.CurrentUnit);
}
static inline GLuint
_mesa_max_tex_unit(struct gl_context *ctx)
{
/* See OpenGL spec for glActiveTexture: */
return MAX2(ctx->Const.MaxCombinedTextureImageUnits,
ctx->Const.MaxTextureCoordUnits);
}
static inline struct gl_texture_unit *
_mesa_get_tex_unit_err(struct gl_context *ctx, GLuint unit, const char *func)
{
if (unit < _mesa_max_tex_unit(ctx))
return _mesa_get_tex_unit(ctx, unit);
/* Note: This error is a precedent set by glBindTextures. From the GL 4.5
* specification (30.10.2014) Section 8.1 ("Texture Objects"):
*
* "An INVALID_OPERATION error is generated if first + count is greater
* than the number of texture image units supported by the
* implementation."
*/
_mesa_error(ctx, GL_INVALID_OPERATION, "%s(unit=%s)", func,
_mesa_lookup_enum_by_nr(GL_TEXTURE0+unit));
return NULL;
}
extern void
_mesa_copy_texture_state( const struct gl_context *src, struct gl_context *dst );
extern void
_mesa_print_texunit_state( struct gl_context *ctx, GLuint unit );
/**
* \name Called from API
*/
/*@{*/
extern void GLAPIENTRY
_mesa_ActiveTexture( GLenum target );
extern void GLAPIENTRY
_mesa_ClientActiveTexture( GLenum target );
/*@}*/
/**
* \name Initialization, state maintenance
*/
/*@{*/
extern void
_mesa_update_texture( struct gl_context *ctx, GLuint new_state );
extern GLboolean
_mesa_init_texture( struct gl_context *ctx );
extern void
_mesa_free_texture_data( struct gl_context *ctx );
extern void
_mesa_update_default_objects_texture(struct gl_context *ctx);
/*@}*/
#endif
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