/*
 * Mesa 3-D graphics library
 * Version:  6.5
 *
 * Copyright (C) 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
 * 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.
 */

#if !defined SLANG_LINK_H
#define SLANG_LINK_H

#include "slang_compile.h"

#if defined __cplusplus
extern "C" {
#endif

enum
{
	SLANG_SHADER_VERTEX,
	SLANG_SHADER_FRAGMENT,
	SLANG_SHADER_MAX
};

/* Active variables.
 *
 * Active uniforms or attribs can be queried by the application to get a list of uniforms
 * or attribs actually used by shaders (uniforms) or vertex shader (attribs).
 */

typedef struct
{
	slang_export_data_quant *quant;
	char *name;
} slang_active_variable;

typedef struct
{
	slang_active_variable *table;
	GLuint count;
} slang_active_variables;

/*
 * Attrib binding override.
 *
 * The application can override GL attrib binding by specifying its preferred index assignment
 * for a given attrib name. Those overrides are taken into account while linking the program.
 */

typedef struct
{
	GLuint index;
	GLchar *name;
} slang_attrib_override;

typedef struct
{
	slang_attrib_override *table;
	GLuint count;
} slang_attrib_overrides;

GLboolean slang_attrib_overrides_add (slang_attrib_overrides *, GLuint, const GLchar *);

/*
 * Uniform bindings.
 *
 * Each slang_uniform_binding holds an array of addresses to actual memory locations in those
 * shader types that use that uniform. Uniform bindings are held in an array and accessed
 * by array index which is seen to the application as a uniform location.
 *
 * When the application writes to a particular uniform, it specifies its location.
 * This location is treated as an array index to slang_uniform_bindings::table and tested
 * against slang_uniform_bindings::count limit. The result is a pointer to slang_uniform_binding.
 * The type of data being written to uniform is tested against slang_uniform_binding::quant.
 * If the types are compatible, the array slang_uniform_binding::address is iterated for
 * each shader type and if the address is valid (i.e. the uniform is used by this shader type),
 * the new uniform value is written at that address.
 */

typedef struct
{
	slang_export_data_quant *quant;
	char *name;
	GLuint address[SLANG_SHADER_MAX];
} slang_uniform_binding;

typedef struct
{
	slang_uniform_binding *table;
	GLuint count;
} slang_uniform_bindings;

/*
 * Attrib bindings.
 *
 * There is a fixed number of vertex attrib vectors (attrib slots). The slang_attrib_slot::addr
 * maps vertex attrib index to the actual memory location of the attrib in vertex shader.
 * One vertex attrib can span over many attrib slots (this is the case for matrices). The
 * slang_attrib_binding::first_slot_index holds the first slot index that the attrib is bound to.
 */

typedef struct
{
	slang_export_data_quant *quant;
	char *name;
	GLuint first_slot_index;
} slang_attrib_binding;

typedef struct
{
	GLuint addr;
} slang_attrib_slot;

typedef struct
{
	slang_attrib_binding bindings[MAX_VERTEX_ATTRIBS];
	GLuint binding_count;
	slang_attrib_slot slots[MAX_VERTEX_ATTRIBS];
} slang_attrib_bindings;

/*
 * Varying bindings.
 *
 * There is a fixed number of varying floats (varying slots). The slang_varying_slot::vert_addr
 * maps varying float index to the actual memory location of the output variable in vertex shader.
 * The slang_varying_slot::frag_addr maps varying float index to the actual memory location of
 * the input variable in fragment shader.
 */

typedef struct
{
	GLuint vert_addr;
	GLuint frag_addr;
} slang_varying_slot;

typedef struct
{
	slang_export_data_quant *quant;
	char *name;
	GLuint first_slot_index;
} slang_varying_binding;

typedef struct
{
	slang_varying_binding bindings[MAX_VARYING_FLOATS];
	GLuint binding_count;
	slang_varying_slot slots[MAX_VARYING_FLOATS];
	GLuint slot_count;
} slang_varying_bindings;

/*
 * Texture usage.
 *
 * A slang_texture_usage struct holds indirect information about texture image unit usage. The
 * slang_texture_usages::table is derived from active uniform table by extracting only uniforms
 * that are samplers.
 *
 * To collect current texture usage one must iterate the slang_texture_usages::table and read
 * uniform at address slang_texture_usage::frag_address to get texture unit index. This
 * index, coupled with texture access type (target) taken from slang_texture_usage::quant
 * forms texture usage for that texture unit.
 */

typedef struct
{
	slang_export_data_quant *quant;
	GLuint frag_address;
} slang_texture_usage;

typedef struct
{
	slang_texture_usage *table;
	GLuint count;
} slang_texture_usages;

GLvoid slang_texture_usages_ctr (slang_texture_usages *);
GLvoid slang_texture_usages_dtr (slang_texture_usages *);

enum
{
	SLANG_COMMON_FIXED_MODELVIEWMATRIX,
	SLANG_COMMON_FIXED_PROJECTIONMATRIX,
	SLANG_COMMON_FIXED_MODELVIEWPROJECTIONMATRIX,
	SLANG_COMMON_FIXED_TEXTUREMATRIX,
	SLANG_COMMON_FIXED_NORMALMATRIX,
	SLANG_COMMON_FIXED_MODELVIEWMATRIXINVERSE,
	SLANG_COMMON_FIXED_PROJECTIONMATRIXINVERSE,
	SLANG_COMMON_FIXED_MODELVIEWPROJECTIONMATRIXINVERSE,
	SLANG_COMMON_FIXED_TEXTUREMATRIXINVERSE,
	SLANG_COMMON_FIXED_MODELVIEWMATRIXTRANSPOSE,
	SLANG_COMMON_FIXED_PROJECTIONMATRIXTRANSPOSE,
	SLANG_COMMON_FIXED_MODELVIEWPROJECTIONMATRIXTRANSPOSE,
	SLANG_COMMON_FIXED_TEXTUREMATRIXTRANSPOSE,
	SLANG_COMMON_FIXED_MODELVIEWMATRIXINVERSETRANSPOSE,
	SLANG_COMMON_FIXED_PROJECTIONMATRIXINVERSETRANSPOSE,
	SLANG_COMMON_FIXED_MODELVIEWPROJECTIONMATRIXINVERSETRANSPOSE,
	SLANG_COMMON_FIXED_TEXTUREMATRIXINVERSETRANSPOSE,
	SLANG_COMMON_FIXED_NORMALSCALE,
	SLANG_COMMON_FIXED_DEPTHRANGE,
	SLANG_COMMON_FIXED_CLIPPLANE,
	SLANG_COMMON_FIXED_POINT,
	SLANG_COMMON_FIXED_FRONTMATERIAL,
	SLANG_COMMON_FIXED_BACKMATERIAL,
	SLANG_COMMON_FIXED_LIGHTSOURCE,
	SLANG_COMMON_FIXED_LIGHTMODEL,
	SLANG_COMMON_FIXED_FRONTLIGHTMODELPRODUCT,
	SLANG_COMMON_FIXED_BACKLIGHTMODELPRODUCT,
	SLANG_COMMON_FIXED_FRONTLIGHTPRODUCT,
	SLANG_COMMON_FIXED_BACKLIGHTPRODUCT,
	SLANG_COMMON_FIXED_TEXTUREENVCOLOR,
	SLANG_COMMON_FIXED_EYEPLANES,
	SLANG_COMMON_FIXED_EYEPLANET,
	SLANG_COMMON_FIXED_EYEPLANER,
	SLANG_COMMON_FIXED_EYEPLANEQ,
	SLANG_COMMON_FIXED_OBJECTPLANES,
	SLANG_COMMON_FIXED_OBJECTPLANET,
	SLANG_COMMON_FIXED_OBJECTPLANER,
	SLANG_COMMON_FIXED_OBJECTPLANEQ,
	SLANG_COMMON_FIXED_FOG,
	SLANG_COMMON_FIXED_MAX
};

enum
{
	SLANG_VERTEX_FIXED_POSITION,
	SLANG_VERTEX_FIXED_POINTSIZE,
	SLANG_VERTEX_FIXED_CLIPVERTEX,
	SLANG_VERTEX_FIXED_COLOR,
	SLANG_VERTEX_FIXED_SECONDARYCOLOR,
	SLANG_VERTEX_FIXED_NORMAL,
	SLANG_VERTEX_FIXED_VERTEX,
	SLANG_VERTEX_FIXED_MULTITEXCOORD0,
	SLANG_VERTEX_FIXED_MULTITEXCOORD1,
	SLANG_VERTEX_FIXED_MULTITEXCOORD2,
	SLANG_VERTEX_FIXED_MULTITEXCOORD3,
	SLANG_VERTEX_FIXED_MULTITEXCOORD4,
	SLANG_VERTEX_FIXED_MULTITEXCOORD5,
	SLANG_VERTEX_FIXED_MULTITEXCOORD6,
	SLANG_VERTEX_FIXED_MULTITEXCOORD7,
	SLANG_VERTEX_FIXED_FOGCOORD,
	SLANG_VERTEX_FIXED_FRONTCOLOR,
	SLANG_VERTEX_FIXED_BACKCOLOR,
	SLANG_VERTEX_FIXED_FRONTSECONDARYCOLOR,
	SLANG_VERTEX_FIXED_BACKSECONDARYCOLOR,
	SLANG_VERTEX_FIXED_TEXCOORD,
	SLANG_VERTEX_FIXED_FOGFRAGCOORD,
	SLANG_VERTEX_FIXED_MAX
};

enum
{
	SLANG_FRAGMENT_FIXED_FRAGCOORD,
	SLANG_FRAGMENT_FIXED_FRONTFACING,
	SLANG_FRAGMENT_FIXED_FRAGCOLOR,
	SLANG_FRAGMENT_FIXED_FRAGDATA,
	SLANG_FRAGMENT_FIXED_FRAGDEPTH,
	SLANG_FRAGMENT_FIXED_COLOR,
	SLANG_FRAGMENT_FIXED_SECONDARYCOLOR,
	SLANG_FRAGMENT_FIXED_TEXCOORD,
	SLANG_FRAGMENT_FIXED_FOGFRAGCOORD,
	SLANG_FRAGMENT_FIXED_MAX
};

enum
{
	SLANG_COMMON_CODE_MAIN,
	SLANG_COMMON_CODE_MAX
};

typedef struct
{
	slang_active_variables active_uniforms;
	slang_active_variables active_attribs;
	slang_attrib_overrides attrib_overrides;
	slang_uniform_bindings uniforms;
	slang_attrib_bindings attribs;
	slang_varying_bindings varyings;
	slang_texture_usages texture_usage;
	GLuint common_fixed_entries[SLANG_SHADER_MAX][SLANG_COMMON_FIXED_MAX];
	GLuint vertex_fixed_entries[SLANG_VERTEX_FIXED_MAX];
	GLuint fragment_fixed_entries[SLANG_FRAGMENT_FIXED_MAX];
	GLuint code[SLANG_SHADER_MAX][SLANG_COMMON_CODE_MAX];
	slang_machine *machines[SLANG_SHADER_MAX];
	slang_assembly_file *assemblies[SLANG_SHADER_MAX];
} slang_program;

GLvoid slang_program_ctr (slang_program *);
GLvoid slang_program_dtr (slang_program *);

GLboolean _slang_link (slang_program *, slang_translation_unit **, GLuint);

#ifdef __cplusplus
}
#endif

#endif