render.h

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/*
Copyright (C) 1996-1997 Id Software, Inc.
 
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.
 
*/
 
#ifndef RENDER_H
#define RENDER_H
 
#include "svbsp.h"
#include "r_stats.h"
 
typedef enum glsl_attrib_e
{
    GLSLATTRIB_POSITION = 0,
    GLSLATTRIB_COLOR = 1,
    GLSLATTRIB_TEXCOORD0 = 2,
    GLSLATTRIB_TEXCOORD1 = 3,
    GLSLATTRIB_TEXCOORD2 = 4,
    GLSLATTRIB_TEXCOORD3 = 5,
    GLSLATTRIB_TEXCOORD4 = 6,
    GLSLATTRIB_TEXCOORD5 = 7,
    GLSLATTRIB_TEXCOORD6 = 8,
    GLSLATTRIB_TEXCOORD7 = 9,
}
glsl_attrib;
 
typedef enum shaderlanguage_e
{
    SHADERLANGUAGE_GLSL,
    SHADERLANGUAGE_COUNT
}
shaderlanguage_t;
 
typedef enum shadermode_e
{
    SHADERMODE_GENERIC, 
    SHADERMODE_POSTPROCESS, 
    SHADERMODE_DEPTH_OR_SHADOW, 
    SHADERMODE_FLATCOLOR, 
    SHADERMODE_VERTEXCOLOR, 
    SHADERMODE_LIGHTMAP, 
    SHADERMODE_LIGHTDIRECTIONMAP_MODELSPACE, 
    SHADERMODE_LIGHTDIRECTIONMAP_TANGENTSPACE, 
    SHADERMODE_LIGHTDIRECTIONMAP_FORCED_LIGHTMAP, // forced deluxemapping for lightmapped surfaces
    SHADERMODE_LIGHTDIRECTIONMAP_FORCED_VERTEXCOLOR, // forced deluxemapping for vertexlit surfaces
    SHADERMODE_LIGHTGRID, 
    SHADERMODE_LIGHTDIRECTION, 
    SHADERMODE_LIGHTSOURCE, 
    SHADERMODE_REFRACTION, 
    SHADERMODE_WATER, 
    SHADERMODE_DEFERREDGEOMETRY, 
    SHADERMODE_DEFERREDLIGHTSOURCE, 
    SHADERMODE_COUNT
}
shadermode_t;
 
#define SHADERPERMUTATION_DIFFUSE (1u<<0) 
#define SHADERPERMUTATION_VERTEXTEXTUREBLEND (1u<<1) 
#define SHADERPERMUTATION_VIEWTINT (1u<<2) 
#define SHADERPERMUTATION_COLORMAPPING (1u<<3) 
#define SHADERPERMUTATION_SATURATION (1u<<4) 
#define SHADERPERMUTATION_FOGINSIDE (1u<<5) 
#define SHADERPERMUTATION_FOGOUTSIDE (1u<<6) 
#define SHADERPERMUTATION_FOGHEIGHTTEXTURE (1u<<7) 
#define SHADERPERMUTATION_FOGALPHAHACK (1u<<8) 
#define SHADERPERMUTATION_GAMMARAMPS (1u<<9) 
#define SHADERPERMUTATION_CUBEFILTER (1u<<10) 
#define SHADERPERMUTATION_GLOW (1u<<11) 
#define SHADERPERMUTATION_BLOOM (1u<<12) 
#define SHADERPERMUTATION_SPECULAR (1u<<13) 
#define SHADERPERMUTATION_POSTPROCESSING (1u<<14) 
#define SHADERPERMUTATION_REFLECTION (1u<<15) 
#define SHADERPERMUTATION_OFFSETMAPPING (1u<<16) 
#define SHADERPERMUTATION_OFFSETMAPPING_RELIEFMAPPING (1u<<17) 
#define SHADERPERMUTATION_SHADOWMAP2D (1u<<18) 
#define SHADERPERMUTATION_SHADOWMAPVSDCT (1u<<19) 
#define SHADERPERMUTATION_SHADOWMAPORTHO (1u<<20) 
#define SHADERPERMUTATION_DEFERREDLIGHTMAP (1u<<21) 
#define SHADERPERMUTATION_ALPHAKILL (1u<<22) 
#define SHADERPERMUTATION_REFLECTCUBE (1u<<23) 
#define SHADERPERMUTATION_NORMALMAPSCROLLBLEND (1u<<24) 
#define SHADERPERMUTATION_BOUNCEGRID (1u<<25) 
#define SHADERPERMUTATION_BOUNCEGRIDDIRECTIONAL (1u<<26) 
#define SHADERPERMUTATION_TRIPPY (1u<<27) 
#define SHADERPERMUTATION_DEPTHRGB (1u<<28) 
#define SHADERPERMUTATION_ALPHAGEN_VERTEX (1u<<29) 
#define SHADERPERMUTATION_SKELETAL (1u<<30) 
#define SHADERPERMUTATION_OCCLUDE (1u<<31) 
#define SHADERPERMUTATION_COUNT 32u 
// UBSan: unsigned literals because left shifting by 31 causes signed overflow, although it works as expected on x86.
 
// 1.0f / N table
extern float ixtable[4096];
 
// fog stuff
void FOG_clear(void);
 
// sky stuff
extern cvar_t r_sky;
extern cvar_t r_skyscroll1;
extern cvar_t r_skyscroll2;
extern cvar_t r_sky_scissor;
extern cvar_t r_q3bsp_renderskydepth;
extern int skyrenderlater, skyrendermasked;
extern int skyscissor[4];
int R_SetSkyBox(const char *sky);
void R_SkyStartFrame(void);
void R_Sky(void);
void R_ResetSkyBox(void);
 
// SHOWLMP stuff (Nehahra)
void SHOWLMP_decodehide(void);
void SHOWLMP_decodeshow(void);
void SHOWLMP_drawall(void);
 
// render profiling stuff
extern int r_timereport_active;
 
// lighting stuff
extern cvar_t r_ambient;
extern cvar_t gl_flashblend;
 
// vis stuff
extern cvar_t r_novis;
 
extern cvar_t r_trippy;
extern cvar_t r_fxaa;
 
extern cvar_t r_lerpsprites;
extern cvar_t r_lerpmodels;
extern cvar_t r_lerplightstyles;
extern cvar_t r_waterscroll;
 
extern cvar_t developer_texturelogging;
 
// shadow volume bsp struct with automatically growing nodes buffer
extern svbsp_t r_svbsp;
 
typedef struct rmesh_s
{
    // vertices of this mesh
    int maxvertices;
    int numvertices;
    float *vertex3f;
    float *svector3f;
    float *tvector3f;
    float *normal3f;
    float *texcoord2f;
    float *texcoordlightmap2f;
    float *color4f;
    // triangles of this mesh
    int maxtriangles;
    int numtriangles;
    int *element3i;
    // snapping epsilon
    float epsilon2;
}
rmesh_t;
 
// useful functions for rendering
void R_ModulateColors(float *in, float *out, int verts, float r, float g, float b);
void R_FillColors(float *out, int verts, float r, float g, float b, float a);
void R_Mesh_AddPolygon3f(rmesh_t *mesh, int numvertices, float *vertex3f);
void R_Mesh_AddBrushMeshFromPlanes(rmesh_t *mesh, int numplanes, mplane_t *planes);
 
#define TOP_RANGE       16          // soldier uniform colors
#define BOTTOM_RANGE    96
 
//=============================================================================
 
extern cvar_t r_nearclip;
 
// forces all rendering to draw triangle outlines
extern cvar_t r_showoverdraw;
extern cvar_t r_showtris;
extern cvar_t r_shownormals;
extern cvar_t r_showlighting;
extern cvar_t r_showcollisionbrushes;
extern cvar_t r_showcollisionbrushes_polygonfactor;
extern cvar_t r_showcollisionbrushes_polygonoffset;
extern cvar_t r_showdisabledepthtest;
 
extern cvar_t r_drawentities;
extern cvar_t r_draw2d;
extern qbool r_draw2d_force;
extern cvar_t r_drawviewmodel;
extern cvar_t r_drawworld;
extern cvar_t r_speeds;
extern cvar_t r_fullbright;
extern cvar_t r_wateralpha;
extern cvar_t r_dynamic;
 
extern cvar_t r_q1bsp_lightmap_updates_enabled;
extern cvar_t r_q1bsp_lightmap_updates_combine;
extern cvar_t r_q1bsp_lightmap_updates_combine_full_texture;
extern cvar_t r_q1bsp_lightmap_updates_hidden_surfaces;
 
void R_NewExplosion(const vec3_t org);
void R_UpdateVariables(void); // must call after setting up most of r_refdef, but before calling R_RenderView
void R_RenderView(int fbo, rtexture_t *depthtexture, rtexture_t *colortexture, int x, int y, int width, int height); // must set r_refdef and call R_UpdateVariables and CL_UpdateEntityShading first
void R_RenderView_UpdateViewVectors(void); // just updates r_refdef.view.{forward,left,up,origin,right,inverse_matrix}
 
float RSurf_FogPoint(const float *v);
float RSurf_FogVertex(const float *v);
 
typedef enum r_refdef_scene_type_s {
    RST_CLIENT,
    RST_MENU,
    RST_COUNT
} r_refdef_scene_type_t;
 
typedef enum r_viewport_type_e
{
    R_VIEWPORTTYPE_ORTHO,
    R_VIEWPORTTYPE_PERSPECTIVE,
    R_VIEWPORTTYPE_PERSPECTIVE_INFINITEFARCLIP,
    R_VIEWPORTTYPE_PERSPECTIVECUBESIDE,
    R_VIEWPORTTYPE_TOTAL
}
r_viewport_type_t;
 
typedef struct r_viewport_s
{
    matrix4x4_t cameramatrix;  
    matrix4x4_t viewmatrix;    
    matrix4x4_t projectmatrix; 
    int x;
    int y;
    int z;
    int width;
    int height;
    int depth;
    r_viewport_type_t type;
    float screentodepth[2];    
}
r_viewport_t;
 
typedef struct r_refdef_view_s
{
    // view information (changes multiple times per frame)
    // if any of these variables change then r_refdef.viewcache must be regenerated
    // by calling R_View_Update
    // (which also updates viewport, scissor, colormask)
 
    // it is safe and expected to copy this into a structure on the stack and
    // call the renderer recursively, then restore from the stack afterward
    // (as long as R_View_Update is called)
 
    // eye position information
    matrix4x4_t matrix, inverse_matrix;
    vec3_t origin;
    vec3_t forward;
    vec3_t left;
    vec3_t right;
    vec3_t up;
    int numfrustumplanes;
    mplane_t frustum[6];
    qbool useclipplane;
    qbool usecustompvs; 
    mplane_t clipplane;
    float frustum_x, frustum_y;
    vec3_t frustumcorner[4];
    int useperspective;
    int usevieworiginculling;
    float ortho_x, ortho_y;
 
    // screen area to render in
    int x;
    int y;
    int z;
    int width;
    int height;
    int depth;
    r_viewport_t viewport; 
 
    int colormask[4];
 
    float colorscale;
 
    qbool clear;
    qbool isoverlay;
    qbool ismain;
 
    // whether to draw r_showtris and such, this is only true for the main
    // view render, all secondary renders (mirrors, portals, cameras,
    // distortion effects, etc) omit such debugging information
    qbool showdebug;
 
    // these define which values to use in GL_CullFace calls to request frontface or backface culling
    int cullface_front;
    int cullface_back;
 
    float quality;
}
r_refdef_view_t;
 
typedef struct r_refdef_viewcache_s
{
    // updated by gl_main_newmap()
    int maxentities;
    int world_numleafs;
    int world_numsurfaces;
 
    // these properties are generated by R_View_Update()
 
    unsigned char *entityvisible;
 
    // flag arrays used for visibility checking on world model
    // (all other entities have no per-surface/per-leaf visibility checks)
    unsigned char *world_pvsbits;
    unsigned char *world_leafvisible;
    unsigned char *world_surfacevisible;
    qbool world_novis;
}
r_refdef_viewcache_t;
 
// TODO: really think about which fields should go into scene and which one should stay in refdef [1/7/2008 Black]
// maybe also refactor some of the functions to support different setting sources (ie. fogenabled, etc.) for different scenes
typedef struct r_refdef_scene_s {
    double time;
 
    entity_render_t *worldentity;
 
    model_t *worldmodel;
 
    entity_render_t **entities;
    int numentities;
    int maxentities;
 
    entity_render_t *tempentities;
    int numtempentities;
    int maxtempentities;
    qbool expandtempentities;
 
    // renderable dynamic lights
    rtlight_t *lights[MAX_DLIGHTS];
    rtlight_t templights[MAX_DLIGHTS];
    int numlights;
 
    // intensities for light styles right now, controls rtlights
    float rtlightstylevalue[MAX_LIGHTSTYLES]; 
    // 8.8bit fixed point intensities for light styles
    // controls intensity lightmap layers
    unsigned short lightstylevalue[MAX_LIGHTSTYLES]; 
 
    // adds brightness to the whole scene, separate from lightmapintensity
    // see CL_UpdateEntityShading
    float ambientintensity;
    // brightness of lightmap and modellight lighting on materials
    // see CL_UpdateEntityShading
    float lightmapintensity;
 
    qbool rtworld;
    qbool rtworldshadows;
    qbool rtdlight;
    qbool rtdlightshadows;
} r_refdef_scene_t;
 
typedef struct r_refdef_s
{
    // these fields define the basic rendering information for the world
    // but not the view, which could change multiple times in one rendered
    // frame (for example when rendering textures for certain effects)
 
    // these are set for water warping before
    // frustum_x/frustum_y are calculated
    float frustumscale_x, frustumscale_y;
 
    // current view settings (these get reset a few times during rendering because of water rendering, reflections, etc)
    r_refdef_view_t view;
    r_refdef_viewcache_t viewcache;
 
    // minimum visible distance (pixels closer than this disappear)
    double nearclip;
    // maximum visible distance (pixels further than this disappear in 16bpp modes,
    // in 32bpp an infinite-farclip matrix is used instead)
    double farclip;
 
    // fullscreen color blend
    float viewblend[4];
 
    r_refdef_scene_t scene;
 
    float fogplane[4];
    float fogplaneviewdist;
    qbool fogplaneviewabove;
    float fogheightfade;
    float fogcolor[3];
    float fogrange;
    float fograngerecip;
    float fogmasktabledistmultiplier;
#define FOGMASKTABLEWIDTH 1024
    float fogmasktable[FOGMASKTABLEWIDTH];
    float fogmasktable_start, fogmasktable_alpha, fogmasktable_range, fogmasktable_density;
    float fog_density;
    float fog_red;
    float fog_green;
    float fog_blue;
    float fog_alpha;
    float fog_start;
    float fog_end;
    float fog_height;
    float fog_fadedepth;
    qbool fogenabled;
    qbool oldgl_fogenable;
 
    // new flexible texture height fog (overrides normal fog)
    char fog_height_texturename[64]; // note: must be 64 for the sscanf code
    unsigned char *fog_height_table1d;
    unsigned char *fog_height_table2d;
    int fog_height_tablesize; // enable
    float fog_height_tablescale;
    float fog_height_texcoordscale;
    char fogheighttexturename[64]; // detects changes to active fog height texture
 
    int draw2dstage; // 0 = no, 1 = yes, other value = needs setting up again
 
    // true during envmap command capture
    qbool envmap;
 
    // whether to draw world lights realtime, dlights realtime, and their shadows
    float polygonfactor;
    float polygonoffset;
 
    // how long R_RenderView took on the previous frame
    double lastdrawscreentime;
 
    // rendering stats for r_speeds display
    // (these are incremented in many places)
    int stats[r_stat_count];
}
r_refdef_t;
 
extern r_refdef_t r_refdef;
 
void R_SelectScene( r_refdef_scene_type_t scenetype );
r_refdef_scene_t * R_GetScenePointer( r_refdef_scene_type_t scenetype );
 
void R_SkinFrame_PrepareForPurge(void);
void R_SkinFrame_MarkUsed(skinframe_t *skinframe);
void R_SkinFrame_PurgeSkinFrame(skinframe_t *skinframe);
void R_SkinFrame_Purge(void);
// set last to NULL to start from the beginning
skinframe_t *R_SkinFrame_FindNextByName( skinframe_t *last, const char *name );
skinframe_t *R_SkinFrame_Find(const char *name, int textureflags, int comparewidth, int compareheight, int comparecrc, qbool add);
skinframe_t *R_SkinFrame_LoadExternal(const char *name, int textureflags, qbool complain, qbool fallbacknotexture);
skinframe_t *R_SkinFrame_LoadExternal_SkinFrame(skinframe_t *skinframe, const char *name, int textureflags, qbool complain, qbool fallbacknotexture);
skinframe_t *R_SkinFrame_LoadInternalBGRA(const char *name, int textureflags, const unsigned char *skindata, int width, int height, int comparewidth, int compareheight, int comparecrc, qbool sRGB);
skinframe_t *R_SkinFrame_LoadInternalQuake(const char *name, int textureflags, int loadpantsandshirt, int loadglowtexture, const unsigned char *skindata, int width, int height);
skinframe_t *R_SkinFrame_LoadInternal8bit(const char *name, int textureflags, const unsigned char *skindata, int width, int height, const unsigned int *palette, const unsigned int *alphapalette);
skinframe_t *R_SkinFrame_LoadMissing(void);
skinframe_t *R_SkinFrame_LoadNoTexture(void);
skinframe_t *R_SkinFrame_LoadInternalUsingTexture(const char *name, int textureflags, rtexture_t *tex, int width, int height, qbool sRGB);
 
rtexture_t *R_GetCubemap(const char *basename);
 
void R_View_WorldVisibility(qbool forcenovis);
void R_DrawParticles(void);
void R_DrawExplosions(void);
 
#define gl_solid_format 3
#define gl_alpha_format 4
 
qbool R_CullFrustum(const vec3_t mins, const vec3_t maxs);
qbool R_CullBox(const vec3_t mins, const vec3_t maxs, int numplanes, const mplane_t *planes);
qbool R_CanSeeBox(int numsamples, vec_t eyejitter, vec_t entboxenlarge, vec_t entboxexpand, vec_t pad, vec3_t eye, vec3_t entboxmins, vec3_t entboxmaxs);
 
#include "r_modules.h"
 
#include "meshqueue.h"
 
void R_FrameData_Reset(void);
void R_FrameData_NewFrame(void);
void *R_FrameData_Alloc(size_t size);
void *R_FrameData_Store(size_t size, void *data);
void R_FrameData_SetMark(void);
void R_FrameData_ReturnToMark(void);
 
typedef enum r_bufferdata_type_e
{
    R_BUFFERDATA_VERTEX, 
    R_BUFFERDATA_INDEX16, 
    R_BUFFERDATA_INDEX32, 
    R_BUFFERDATA_UNIFORM, 
    R_BUFFERDATA_COUNT 
}
r_bufferdata_type_t;
 
void R_BufferData_Reset(void);
void R_BufferData_NewFrame(void);
r_meshbuffer_t *R_BufferData_Store(size_t size, const void *data, r_bufferdata_type_t type, int *returnbufferoffset);
 
void R_AnimCache_Free(void);
void R_AnimCache_ClearCache(void);
qbool R_AnimCache_GetEntity(entity_render_t *ent, qbool wantnormals, qbool wanttangents);
void R_AnimCache_CacheVisibleEntities(void);
 
extern cvar_t r_render;
extern cvar_t r_renderview;
extern cvar_t r_waterwarp;
 
extern cvar_t r_glsl_offsetmapping;
extern cvar_t r_glsl_offsetmapping_reliefmapping;
extern cvar_t r_glsl_offsetmapping_scale;
extern cvar_t r_glsl_offsetmapping_lod;
extern cvar_t r_glsl_offsetmapping_lod_distance;
extern cvar_t r_glsl_deluxemapping;
 
extern cvar_t gl_polyblend;
 
extern cvar_t cl_deathfade;
 
extern cvar_t r_smoothnormals_areaweighting;
 
extern cvar_t r_test;
 
#include "gl_backend.h"
 
extern rtexture_t *r_texture_blanknormalmap;
extern rtexture_t *r_texture_white;
extern rtexture_t *r_texture_grey128;
extern rtexture_t *r_texture_black;
extern rtexture_t *r_texture_notexture;
extern rtexture_t *r_texture_whitecube;
extern rtexture_t *r_texture_normalizationcube;
extern rtexture_t *r_texture_fogattenuation;
extern rtexture_t *r_texture_fogheighttexture;
 
extern unsigned int r_queries[MAX_OCCLUSION_QUERIES];
extern unsigned int r_numqueries;
extern unsigned int r_maxqueries;
 
void R_TimeReport(const char *name);
 
// r_stain
void R_Stain(const vec3_t origin, float radius, int cr1, int cg1, int cb1, int ca1, int cr2, int cg2, int cb2, int ca2);
 
void R_CalcBeam_Vertex3f(float *vert, const float *org1, const float *org2, float width);
void R_CalcSprite_Vertex3f(float *vertex3f, const vec3_t origin, const vec3_t left, const vec3_t up, float scalex1, float scalex2, float scaley1, float scaley2);
 
extern mempool_t *r_main_mempool;
 
typedef struct rsurfacestate_s
{
    // current model array pointers
    // these may point to processing buffers if model is animated,
    // otherwise they point to static data.
    // these are not directly used for rendering, they are just another level
    // of processing
    //
    // these either point at array_model* buffers (if the model is animated)
    // or the model->surfmesh.data_* buffers (if the model is not animated)
    //
    // these are only set when an entity render begins, they do not change on
    // a per surface basis.
    //
    // this indicates the model* arrays are pointed at array_model* buffers
    // (in other words, the model has been animated in software)
    qbool                    forcecurrenttextureupdate; // set for RSurf_ActiveCustomEntity to force R_GetCurrentTexture to recalculate the texture parameters (such as entity alpha)
    qbool                    modelgeneratedvertex;
    // skeletal animation can be done by entity (animcache) or per batch,
    // batch may be non-skeletal even if entity is skeletal, indicating that
    // the dynamicvertex code path had to apply skeletal manually for a case
    // where gpu-skinning is not possible, for this reason batch has its own
    // variables
    int                         entityskeletalnumtransforms; // how many transforms are used for this mesh
    float                      *entityskeletaltransform3x4; // use gpu-skinning shader on this mesh
    const r_meshbuffer_t       *entityskeletaltransform3x4buffer; // uniform buffer
    int                         entityskeletaltransform3x4offset;
    int                         entityskeletaltransform3x4size;
    float                      *modelvertex3f;
    const r_meshbuffer_t       *modelvertex3f_vertexbuffer;
    int                         modelvertex3f_bufferoffset;
    float                      *modelsvector3f;
    const r_meshbuffer_t       *modelsvector3f_vertexbuffer;
    int                         modelsvector3f_bufferoffset;
    float                      *modeltvector3f;
    const r_meshbuffer_t       *modeltvector3f_vertexbuffer;
    int                         modeltvector3f_bufferoffset;
    float                      *modelnormal3f;
    const r_meshbuffer_t       *modelnormal3f_vertexbuffer;
    int                         modelnormal3f_bufferoffset;
    float                      *modellightmapcolor4f;
    const r_meshbuffer_t       *modellightmapcolor4f_vertexbuffer;
    int                         modellightmapcolor4f_bufferoffset;
    float                      *modeltexcoordtexture2f;
    const r_meshbuffer_t       *modeltexcoordtexture2f_vertexbuffer;
    int                         modeltexcoordtexture2f_bufferoffset;
    float                      *modeltexcoordlightmap2f;
    const r_meshbuffer_t       *modeltexcoordlightmap2f_vertexbuffer;
    int                         modeltexcoordlightmap2f_bufferoffset;
    unsigned char              *modelskeletalindex4ub;
    const r_meshbuffer_t       *modelskeletalindex4ub_vertexbuffer;
    int                         modelskeletalindex4ub_bufferoffset;
    unsigned char              *modelskeletalweight4ub;
    const r_meshbuffer_t       *modelskeletalweight4ub_vertexbuffer;
    int                         modelskeletalweight4ub_bufferoffset;
    int                        *modelelement3i;
    const r_meshbuffer_t       *modelelement3i_indexbuffer;
    int                         modelelement3i_bufferoffset;
    unsigned short             *modelelement3s;
    const r_meshbuffer_t       *modelelement3s_indexbuffer;
    int                         modelelement3s_bufferoffset;
    int                        *modellightmapoffsets;
    int                         modelnumvertices;
    int                         modelnumtriangles;
    const msurface_t           *modelsurfaces;
    // current rendering array pointers
    // these may point to any of several different buffers depending on how
    // much processing was needed to prepare this model for rendering
    // these usually equal the model* pointers, they only differ if
    // deformvertexes is used in a q3 shader, and consequently these can
    // change on a per-surface basis (according to rsurface.texture)
    qbool                    batchgeneratedvertex;
    qbool                    batchmultidraw;
    int                         batchmultidrawnumsurfaces;
    const msurface_t          **batchmultidrawsurfacelist;
    int                         batchfirstvertex;
    int                         batchnumvertices;
    int                         batchfirsttriangle;
    int                         batchnumtriangles;
    float                      *batchvertex3f;
    const r_meshbuffer_t       *batchvertex3f_vertexbuffer;
    int                         batchvertex3f_bufferoffset;
    float                      *batchsvector3f;
    const r_meshbuffer_t       *batchsvector3f_vertexbuffer;
    int                         batchsvector3f_bufferoffset;
    float                      *batchtvector3f;
    const r_meshbuffer_t       *batchtvector3f_vertexbuffer;
    int                         batchtvector3f_bufferoffset;
    float                      *batchnormal3f;
    const r_meshbuffer_t       *batchnormal3f_vertexbuffer;
    int                         batchnormal3f_bufferoffset;
    float                      *batchlightmapcolor4f;
    const r_meshbuffer_t       *batchlightmapcolor4f_vertexbuffer;
    int                         batchlightmapcolor4f_bufferoffset;
    float                      *batchtexcoordtexture2f;
    const r_meshbuffer_t       *batchtexcoordtexture2f_vertexbuffer;
    int                         batchtexcoordtexture2f_bufferoffset;
    float                      *batchtexcoordlightmap2f;
    const r_meshbuffer_t       *batchtexcoordlightmap2f_vertexbuffer;
    int                         batchtexcoordlightmap2f_bufferoffset;
    unsigned char              *batchskeletalindex4ub;
    const r_meshbuffer_t       *batchskeletalindex4ub_vertexbuffer;
    int                         batchskeletalindex4ub_bufferoffset;
    unsigned char              *batchskeletalweight4ub;
    const r_meshbuffer_t       *batchskeletalweight4ub_vertexbuffer;
    int                         batchskeletalweight4ub_bufferoffset;
    int                        *batchelement3i;
    const r_meshbuffer_t       *batchelement3i_indexbuffer;
    int                         batchelement3i_bufferoffset;
    unsigned short             *batchelement3s;
    const r_meshbuffer_t       *batchelement3s_indexbuffer;
    int                         batchelement3s_bufferoffset;
    int                         batchskeletalnumtransforms;
    float                      *batchskeletaltransform3x4;
    const r_meshbuffer_t       *batchskeletaltransform3x4buffer; // uniform buffer
    int                         batchskeletaltransform3x4offset;
    int                         batchskeletaltransform3x4size;
 
    // some important fields from the entity
    int ent_skinnum;
    int ent_qwskin;
    int ent_flags;
    int ent_alttextures; // used by q1bsp animated textures (pressed buttons)
    double shadertime; // r_refdef.scene.time - ent->shadertime
    // transform matrices to render this entity and effects on this entity
    matrix4x4_t matrix;
    matrix4x4_t inversematrix;
    // scale factors for transforming lengths into/out of entity space
    float matrixscale;
    float inversematrixscale;
    // animation blending state from entity
    frameblend_t frameblend[MAX_FRAMEBLENDS];
    skeleton_t *skeleton;
    // view location in model space
    vec3_t localvieworigin;
    // polygon offset data for submodels
    float basepolygonfactor;
    float basepolygonoffset;
    // current textures in batching code
    texture_t *texture;
    rtexture_t *lightmaptexture;
    rtexture_t *deluxemaptexture;
    // whether lightmapping is active on this batch
    // (otherwise vertex colored)
    qbool uselightmaptexture;
    // fog plane in model space for direct application to vertices
    float fograngerecip;
    float fogmasktabledistmultiplier;
    float fogplane[4];
    float fogheightfade;
    float fogplaneviewdist;
 
    // rtlight rendering
    // light currently being rendered
    const rtlight_t *rtlight;
 
    // this is the location of the light in entity space
    vec3_t entitylightorigin;
    // this transforms entity coordinates to light filter cubemap coordinates
    // (also often used for other purposes)
    matrix4x4_t entitytolight;
    // based on entitytolight this transforms -1 to +1 to 0 to 1 for purposes
    // of attenuation texturing in full 3D (Z result often ignored)
    matrix4x4_t entitytoattenuationxyz;
    // this transforms only the Z to S, and T is always 0.5
    matrix4x4_t entitytoattenuationz;
 
    // user wavefunc parameters (from csqc)
    float userwavefunc_param[Q3WAVEFUNC_USER_COUNT];
 
    // pointer to an entity_render_t used only by R_GetCurrentTexture and
    // RSurf_ActiveModelEntity as a unique id within each frame (see r_frame
    // also)
    entity_render_t *entity;
}
rsurfacestate_t;
 
extern rsurfacestate_t rsurface;
 
void R_HDR_UpdateIrisAdaptation(const vec3_t point);
 
void RSurf_ActiveModelEntity(const entity_render_t *ent, qbool wantnormals, qbool wanttangents, qbool prepass);
void RSurf_ActiveCustomEntity(const matrix4x4_t *matrix, const matrix4x4_t *inversematrix, int entflags, double shadertime, float r, float g, float b, float a, int numvertices, const float *vertex3f, const float *texcoord2f, const float *normal3f, const float *svector3f, const float *tvector3f, const float *color4f, int numtriangles, const int *element3i, const unsigned short *element3s, qbool wantnormals, qbool wanttangents);
void RSurf_SetupDepthAndCulling(bool ui);
 
extern int r_textureframe; 
texture_t *R_GetCurrentTexture(texture_t *t);
void R_DrawModelSurfaces(entity_render_t *ent, qbool skysurfaces, qbool writedepth, qbool depthonly, qbool debug, qbool prepass, qbool ui);
void R_DrawCustomSurface(skinframe_t *skinframe, const matrix4x4_t *texmatrix, int materialflags, int firstvertex, int numvertices, int firsttriangle, int numtriangles, qbool writedepth, qbool prepass, qbool ui);
void R_DrawCustomSurface_Texture(texture_t *texture, const matrix4x4_t *texmatrix, int materialflags, int firstvertex, int numvertices, int firsttriangle, int numtriangles, qbool writedepth, qbool prepass, qbool ui);
 
#define BATCHNEED_ARRAY_VERTEX                (1<< 0) // set up rsurface.batchvertex3f
#define BATCHNEED_ARRAY_NORMAL                (1<< 1) // set up rsurface.batchnormal3f
#define BATCHNEED_ARRAY_VECTOR                (1<< 2) // set up rsurface.batchsvector3f and rsurface.batchtvector3f
#define BATCHNEED_ARRAY_VERTEXTINTCOLOR       (1<< 3) // set up rsurface.batchvertexcolor4f
#define BATCHNEED_ARRAY_VERTEXCOLOR           (1<< 4) // set up rsurface.batchlightmapcolor4f
#define BATCHNEED_ARRAY_TEXCOORD              (1<< 5) // set up rsurface.batchtexcoordtexture2f
#define BATCHNEED_ARRAY_LIGHTMAP              (1<< 6) // set up rsurface.batchtexcoordlightmap2f
#define BATCHNEED_ARRAY_SKELETAL              (1<< 7) // set up skeletal index and weight data for vertex shader
#define BATCHNEED_NOGAPS                      (1<< 8) // force vertex copying if firstvertex is not zero or there are gaps
#define BATCHNEED_ALWAYSCOPY                  (1<< 9) // force vertex copying unconditionally - useful if you want to modify colors
#define BATCHNEED_ALLOWMULTIDRAW              (1<<10) // allow multiple draws
void RSurf_PrepareVerticesForBatch(int batchneed, int texturenumsurfaces, const msurface_t **texturesurfacelist);
void RSurf_UploadBuffersForBatch(void);
void RSurf_DrawBatch(void);
 
void R_DecalSystem_SplatEntities(const vec3_t org, const vec3_t normal, float r, float g, float b, float a, float s1, float t1, float s2, float t2, float size);
 
typedef enum rsurfacepass_e
{
    RSURFPASS_BASE,
    RSURFPASS_BACKGROUND,
    RSURFPASS_RTLIGHT,
    RSURFPASS_DEFERREDGEOMETRY
}
rsurfacepass_t;
 
void R_SetupShader_Generic(rtexture_t *t, qbool usegamma, qbool notrippy, qbool suppresstexalpha);
void R_SetupShader_Generic_NoTexture(qbool usegamma, qbool notrippy);
void R_SetupShader_DepthOrShadow(qbool notrippy, qbool depthrgb, qbool skeletal);
void R_SetupShader_Surface(const float ambientcolor[3], const float diffusecolor[3], const float specularcolor[3], rsurfacepass_t rsurfacepass, int texturenumsurfaces, const msurface_t **texturesurfacelist, void *waterplane, qbool notrippy, qbool ui);
void R_SetupShader_DeferredLight(const rtlight_t *rtlight);
 
typedef struct r_rendertarget_s {
    // texcoords for sampling from the viewport (clockwise: 0,0 1,0 1,1 0,1)
    float texcoord2f[8];
    // textures are this size and type
    int texturewidth;
    int textureheight;
    // TEXTYPE for each color target - usually TEXTYPE_COLORBUFFER16F
    textype_t colortextype[4];
    // TEXTYPE for depth target - usually TEXTYPE_DEPTHBUFFER24 or TEXTYPE_SHADOWMAP24_COMP
    textype_t depthtextype;
    // if true the depth target will be a renderbuffer rather than a texture (still rtexture_t though)
    qbool depthisrenderbuffer;
    // framebuffer object referencing the textures
    int fbo;
    // there can be up to 4 color targets and 1 depth target, the depthtexture
    // may be a real texture (readable) or just a renderbuffer (not readable,
    // but potentially faster)
    rtexture_t *colortexture[4];
    rtexture_t *depthtexture;
    // a rendertarget will not be reused in the same frame (host.realtime == lastusetime),
    // on a new frame, matching rendertargets will be reused (texturewidth, textureheight, number of color and depth textures and their types),
    // when a new frame arrives the rendertargets can be reused by requests for matching texturewidth,textureheight and fbo configuration (the number of color and depth textures), when a rendertarget is not reused for > 200ms (host.realtime - lastusetime > 0.2) the rendertarget's resources will be freed (fbo, textures) and it can be reused for any target in future frames
    double lastusetime;
} r_rendertarget_t;
 
// called each frame after render to delete render targets that have not been used for a while
void R_RenderTarget_FreeUnused(qbool force);
// returns a rendertarget, creates rendertarget if needed or intelligently reuses targets across frames if they match and have not been used already this frame
r_rendertarget_t *R_RenderTarget_Get(int texturewidth, int textureheight, textype_t depthtextype, qbool depthisrenderbuffer, textype_t colortextype0, textype_t colortextype1, textype_t colortextype2, textype_t colortextype3);
 
typedef struct r_waterstate_waterplane_s
{
    r_rendertarget_t *rt_refraction; // MATERIALFLAG_WATERSHADER or MATERIALFLAG_REFRACTION
    r_rendertarget_t *rt_reflection; // MATERIALFLAG_WATERSHADER or MATERIALFLAG_REFLECTION
    r_rendertarget_t *rt_camera; // MATERIALFLAG_CAMERA
    mplane_t plane;
    int materialflags; // combined flags of all water surfaces on this plane
    unsigned char *pvsbits;
    qbool pvsvalid;
    int camera_entity;
    vec3_t mins, maxs;
}
r_waterstate_waterplane_t;
 
typedef struct r_waterstate_s
{
    int waterwidth, waterheight;
    int texturewidth, textureheight;
    int camerawidth, cameraheight;
 
    int maxwaterplanes; // same as MAX_WATERPLANES
    int numwaterplanes;
    r_waterstate_waterplane_t waterplanes[MAX_WATERPLANES];
 
    float screenscale[2];
    float screencenter[2];
 
    qbool enabled;
 
    qbool renderingscene; // true while rendering a refraction or reflection texture, disables water surfaces
    qbool hideplayer;
}
r_waterstate_t;
 
typedef struct r_framebufferstate_s
{
    textype_t textype; // type of color buffer we're using (dependent on r_viewfbo cvar)
    int screentexturewidth, screentextureheight; // dimensions of texture
 
    // rt_* fields are per-RenderView so we reset them in R_Bloom_StartFrame
    r_rendertarget_t *rt_screen;
    r_rendertarget_t *rt_bloom;
 
    rtexture_t *ghosttexture; // for r_motionblur (not recommended on multi-GPU hardware!)
    float ghosttexcoord2f[8]; // for r_motionblur
 
    int bloomwidth, bloomheight;
 
    // arrays for rendering the screen passes
    float offsettexcoord2f[8]; // temporary use while updating bloomtexture[]
 
    r_waterstate_t water;
 
    qbool ghosttexture_valid; // don't draw garbage on first frame with motionblur
    qbool usedepthtextures; // use depth texture instead of depth renderbuffer (faster if you need to read it later anyway)
 
    // rendertargets (fbo and viewport), these can be reused across frames
    memexpandablearray_t rendertargets;
}
r_framebufferstate_t;
 
extern r_framebufferstate_t r_fb;
 
extern cvar_t r_viewfbo;
 
void R_ResetViewRendering2D_Common(int viewfbo, rtexture_t *viewdepthtexture, rtexture_t *viewcolortexture, int viewx, int viewy, int viewwidth, int viewheight, float x2, float y2); // this is called by R_ResetViewRendering2D and _DrawQ_Setup and internal
void R_ResetViewRendering2D(int viewfbo, rtexture_t *viewdepthtexture, rtexture_t *viewcolortexture, int viewx, int viewy, int viewwidth, int viewheight);
void R_ResetViewRendering3D(int viewfbo, rtexture_t *viewdepthtexture, rtexture_t *viewcolortexture, int viewx, int viewy, int viewwidth, int viewheight);
void R_SetupView(qbool allowwaterclippingplane, int viewfbo, rtexture_t *viewdepthtexture, rtexture_t *viewcolortexture, int viewx, int viewy, int viewwidth, int viewheight);
void R_DebugLine(vec3_t start, vec3_t end);
extern const float r_screenvertex3f[12];
extern cvar_t r_showspriteedges;
extern cvar_t r_showparticleedges;
extern cvar_t r_shadows;
extern cvar_t r_shadows_darken;
extern cvar_t r_shadows_drawafterrtlighting;
extern cvar_t r_shadows_castfrombmodels;
extern cvar_t r_shadows_throwdistance;
extern cvar_t r_shadows_throwdirection;
extern cvar_t r_shadows_focus;
extern cvar_t r_shadows_shadowmapscale;
extern cvar_t r_shadows_shadowmapbias;
extern cvar_t r_transparent_alphatocoverage;
extern cvar_t r_transparent_sortsurfacesbynearest;
extern cvar_t r_transparent_useplanardistance;
extern cvar_t r_transparent_sortarraysize;
extern cvar_t r_transparent_sortmindist;
extern cvar_t r_transparent_sortmaxdist;
 
extern qbool r_shadow_usingdeferredprepass;
extern rtexture_t *r_shadow_attenuationgradienttexture;
extern rtexture_t *r_shadow_attenuation2dtexture;
extern rtexture_t *r_shadow_attenuation3dtexture;
extern qbool r_shadow_usingshadowmap2d;
extern qbool r_shadow_usingshadowmaportho;
extern float r_shadow_modelshadowmap_texturescale[4];
extern float r_shadow_modelshadowmap_parameters[4];
extern float r_shadow_lightshadowmap_texturescale[4];
extern float r_shadow_lightshadowmap_parameters[4];
extern qbool r_shadow_shadowmapvsdct;
extern rtexture_t *r_shadow_shadowmap2ddepthbuffer;
extern rtexture_t *r_shadow_shadowmap2ddepthtexture;
extern rtexture_t *r_shadow_shadowmapvsdcttexture;
extern matrix4x4_t r_shadow_shadowmapmatrix;
extern int r_shadow_prepass_width;
extern int r_shadow_prepass_height;
extern rtexture_t *r_shadow_prepassgeometrydepthbuffer;
extern rtexture_t *r_shadow_prepassgeometrynormalmaptexture;
extern rtexture_t *r_shadow_prepasslightingdiffusetexture;
extern rtexture_t *r_shadow_prepasslightingspeculartexture;
extern int r_shadow_viewfbo;
extern rtexture_t *r_shadow_viewdepthtexture;
extern rtexture_t *r_shadow_viewcolortexture;
extern int r_shadow_viewx;
extern int r_shadow_viewy;
extern int r_shadow_viewwidth;
extern int r_shadow_viewheight;
 
void R_RenderScene(int viewfbo, rtexture_t *viewdepthtexture, rtexture_t *viewcolortexture, int viewx, int viewy, int viewwidth, int viewheight);
void R_RenderWaterPlanes(int viewfbo, rtexture_t *viewdepthtexture, rtexture_t *viewcolortexture, int viewx, int viewy, int viewwidth, int viewheight);
 
void R_Model_Sprite_Draw(entity_render_t *ent);
 
struct prvm_prog_s;
void R_UpdateFog(void);
qbool CL_VM_UpdateView(double frametime);
void CL_VM_DrawHud(double frametime);
void SCR_DrawConsole(void);
void R_Shadow_EditLights_DrawSelectedLightProperties(void);
void R_DecalSystem_Reset(decalsystem_t *decalsystem);
void R_Shadow_UpdateBounceGridTexture(void);
void R_DrawPortals(void);
void R_BuildLightMap(const entity_render_t *ent, msurface_t *surface, int combine);
void R_Water_AddWaterPlane(msurface_t *surface, int entno);
int R_Shadow_GetRTLightInfo(unsigned int lightindex, float *origin, float *radius, float *color);
dp_font_t *FindFont(const char *title, qbool allocate_new);
void LoadFont(qbool override, const char *name, dp_font_t *fnt, float scale, float voffset);
 
void Render_Init(void);
 
// these are called by Render_Init
void R_Textures_Init(void);
void GL_Draw_Init(void);
void GL_Main_Init(void);
void R_Shadow_Init(void);
void R_Sky_Init(void);
void GL_Surf_Init(void);
void R_Particles_Init(void);
void R_Explosion_Init(void);
void gl_backend_init(void);
void Sbar_Init(void);
void R_LightningBeams_Init(void);
void Mod_RenderInit(void);
void Font_Init(void);
 
qbool R_CompileShader_CheckStaticParms(void);
void R_GLSL_Restart_f(cmd_state_t *cmd);
 
#endif