r_state.h

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/*
All original material Copyright (C) 2002-2022 UFO: Alien Invasion.

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 "../../shared/cxx.h"

#include "r_program.h"
#include "r_material.h"
#include "r_framebuffer.h"
#include "r_light.h"
#include "r_image.h"

#define SKYBOX_DEPTH -9999.0f

/* vertex arrays are used for many things */
#define GL_ARRAY_LENGTH_CHUNK 4096
extern const vec2_t default_texcoords[4];

typedef struct gltexunit_s {
    bool enabled;       
    GLenum texture;     
    GLint texnum;       
    GLenum texenv;      
    GLfloat* texcoord_array;
    /* Size of the array above - it's dynamically reallocated */
    int array_size;
} gltexunit_t;

#define MAX_GL_TEXUNITS     6

/* these are defined for convenience */
#define texunit_0           r_state.texunits[0]
#define texunit_1           r_state.texunits[1]
#define texunit_2           r_state.texunits[2]
#define texunit_3           r_state.texunits[3]
#define texunit_4           r_state.texunits[4]
#define texunit_5           r_state.texunits[5]

#define texunit_diffuse         texunit_0
#define texunit_lightmap        texunit_1
#define texunit_deluxemap       texunit_2
#define texunit_normalmap       texunit_3
#define texunit_glowmap         texunit_4
#define texunit_specularmap     texunit_5
#define texunit_roughnessmap    texunit_2

#define COMPONENTS_VERTEX_ARRAY3D   3
#define COMPONENTS_VERTEX_ARRAY2D   2
#define COMPONENTS_COLOR_ARRAY      4
#define COMPONENTS_INDEX_ARRAY      1
#define COMPONENTS_NORMAL_ARRAY     3
#define COMPONENTS_TANGENT_ARRAY    4
#define COMPONENTS_TEXCOORD_ARRAY   2

#define DOWNSAMPLE_PASSES   5
#define DOWNSAMPLE_SCALE    2

#define fbo_screen          nullptr
#define fbo_render          r_state.renderBuffer
#define fbo_bloom0          r_state.bloomBuffer0
#define fbo_bloom1          r_state.bloomBuffer1

#define default_program     nullptr

struct mAliasMesh_s;

typedef struct rstate_s {
    bool fullscreen;

    /* arrays */
    GLfloat* vertex_array_3d;
    GLshort* vertex_array_2d;
    GLfloat* color_array;
    GLint* index_array;
    GLfloat* normal_array;
    GLfloat* tangent_array;
    GLfloat* next_vertex_array_3d;
    GLfloat* next_normal_array;
    GLfloat* next_tangent_array;

    /* Size of all arrays above - it's dynamically reallocated */
    int array_size;

    /* multitexture texunits */
    gltexunit_t texunits[MAX_GL_TEXUNITS];

    /* texunit in use */
    gltexunit_t* active_texunit;

    /* framebuffer objects*/
    r_framebuffer_t* renderBuffer;
    r_framebuffer_t* bloomBuffer0;
    r_framebuffer_t* bloomBuffer1;
    r_framebuffer_t* buffers0[DOWNSAMPLE_PASSES];
    r_framebuffer_t* buffers1[DOWNSAMPLE_PASSES];
    r_framebuffer_t* buffers2[DOWNSAMPLE_PASSES];
    bool frameBufferObjectsInitialized;
    const r_framebuffer_t* activeFramebuffer;

    /* shaders */
    r_shader_t shaders[MAX_SHADERS];
    r_program_t programs[MAX_PROGRAMS];
    r_program_t* world_program;
    r_program_t* model_program;
    r_program_t* warp_program;
    r_program_t* geoscape_program;
    r_program_t* convolve_program;
    r_program_t* combine2_program;
    r_program_t* atmosphere_program;
    r_program_t* simple_glow_program;
    r_program_t* active_program;

    /* blend function */
    GLenum blend_src, blend_dest;

    const material_t* active_material;

    /* states */
    bool shell_enabled;
    bool blend_enabled;
    bool multisample_enabled;
    bool color_array_enabled;
    bool alpha_test_enabled;
    bool stencil_test_enabled;
    bool lighting_enabled;
    bool warp_enabled;
    bool fog_enabled;
    bool blur_enabled;
    bool glowmap_enabled;
    bool draw_glow_enabled;
    bool dynamic_lighting_enabled;
    bool specularmap_enabled;
    bool roughnessmap_enabled;
    bool animation_enabled;
    bool renderbuffer_enabled; 
    const struct image_s* active_normalmap;
} rstate_t;

extern rstate_t r_state;

void R_SetDefaultState(void);
void R_Setup2D(void);
void R_Setup3D(void);
void R_ReallocateStateArrays(int size);
void R_ReallocateTexunitArray(gltexunit_t* texunit, int size);

void R_TexEnv(GLenum value);
void R_TexOverride (vec4_t rgba);
void R_BlendFunc(GLenum src, GLenum dest);

bool R_SelectTexture(gltexunit_t* texunit);

void R_BindTextureDebug(int texnum, const char* file, int line, const char* function);
#define R_BindTexture(tn) R_BindTextureDebug(tn, __FILE__, __LINE__, __PRETTY_FUNCTION__)
void R_BindTextureForTexUnit(GLuint texnum, gltexunit_t* texunit);
void R_BindLightmapTexture(GLuint texnum);
void R_BindDeluxemapTexture(GLuint texnum);
void R_BindNormalmapTexture(GLuint texnum);
void R_BindBuffer(GLenum target, GLenum type, GLuint id);
void R_BindArray(GLenum target, GLenum type, const void* array);
void R_BindDefaultArray(GLenum target);
void R_EnableStencilTest(bool enable);
void R_EnableTexture(gltexunit_t* texunit, bool enable);
void R_EnableMultisample(bool enable);
void R_EnableBlend(bool enable);
void R_EnableAlphaTest(bool enable);
void R_EnableColorArray(bool enable);
bool R_EnableLighting(r_program_t* program, bool enable);
void R_EnableBumpmap(const struct image_s* normalmap);
void R_EnableWarp(r_program_t* program, bool enable);
void R_EnableBlur(r_program_t* program, bool enable, r_framebuffer_t* source, r_framebuffer_t* dest, int dir);
void R_EnableShell(bool enable);
void R_EnableFog(bool enable);
void R_EnableDrawAsGlow(bool enable);
void R_EnableGlowMap(const struct image_s* image);
void R_EnableSpecularMap(const struct image_s* image, bool enable);
void R_EnableRoughnessMap(const struct image_s* image, bool enable);
void R_SetupSpotLight(int index, const light_t* light);
void R_DisableSpotLight(int index);
void R_EnableAnimation(const struct mAliasMesh_s* mesh, float backlerp, bool enable);

void R_UseMaterial (const material_t* material);