r_program.h

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/*
* Copyright(c) 1997-2001 Id Software, Inc.
* Copyright(c) 2002 The Quakeforge Project.
* Copyright(c) 2006 Quake2World.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or(at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#pragma once

#include "r_gl.h"

/* glsl vertex and fragment shaders */
typedef struct r_shader_s {
    GLenum type;
    GLuint id;
    char name[MAX_QPATH];
} r_shader_t;

#ifndef GL_UNIFORM
#define GL_UNIFORM 1
#endif
#define GL_ATTRIBUTE 2
/* program variables */
typedef struct r_progvar_s {
    GLint type;
    char name[MAX_QPATH];
    GLint location;
} r_progvar_t;

/* NOTE: OpenGL spec says we must be able to have at
 * least 64 uniforms; may be more.  glGet(GL_MAX_FRAGMENT_UNIFORM_COMPONENTS) */
#define MAX_PROGRAM_VARS 32

struct r_program_s;

typedef void (*programInitFunc_t)(struct r_program_s* prog);
typedef void (*programUseFunc_t)(struct r_program_s* prog);

/* and glsl programs */
typedef struct r_program_s {
    GLuint id;
    char name[MAX_VAR];
    r_shader_t* v;  
    r_shader_t* f;  
    r_progvar_t vars[MAX_PROGRAM_VARS];
    programInitFunc_t init;
    programUseFunc_t use;
    void* userdata;
} r_program_t;

#define MAX_PROGRAMS 16
#define MAX_SHADERS MAX_PROGRAMS * 2

void R_UseProgram(r_program_t* prog);
void R_ShutdownPrograms(void);
void R_InitPrograms(void);

void R_AttributePointer(const char* name, GLuint size, const GLvoid* array);
void R_EnableAttribute(const char* name);
void R_DisableAttribute(const char* name);

void R_ProgramParameter1f(const char* name, GLfloat value);
void R_ProgramParameter1fvs(const char* name, GLint size, GLfloat* value);
void R_ProgramParameter1i(const char* name, GLint value);
void R_ProgramParameter2fv(const char* name, GLfloat* value);
void R_ProgramParameter2fvs(const char* name, GLint size, GLfloat* value);
void R_ProgramParameter3fv(const char* name, GLfloat* value);
void R_ProgramParameter3fvs(const char* name, GLint size, GLfloat* value);
void R_ProgramParameter4fv(const char* name, GLfloat* value);
void R_ProgramParameter4fvs(const char* name, GLint size, GLfloat* value);
void R_ProgramParameterMatrix4fv(const char* name, GLfloat* value);

void R_InitParticleProgram(r_program_t* prog);
void R_UseParticleProgram(r_program_t* prog);

r_program_t* R_LoadProgram(const char* name, programInitFunc_t init, programUseFunc_t use);
void R_RestartPrograms_f(void);