forked from a1batross/Paranoia2_original
116 lines
3.9 KiB
C
116 lines
3.9 KiB
C
/*
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gl_grass.h - grass construct & rendering
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this code written for Paranoia 2: Savior modification
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Copyright (C) 2014 Uncle Mike
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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#ifndef GL_GRASS_H
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#define GL_GRASS_H
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#define GRASS_TEXTURES 256 // unique textures for grass (a byte limit, don't change)
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#define GRASS_ANIM_DIST 512.0f // if this is changed it must be changed in glsl too!
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#define MAX_GRASS_ELEMS 65536 // unsigned short limit
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#define MAX_GRASS_VERTS ( MAX_GRASS_ELEMS / 2 ) // ( numelems / 1.5 ) actually
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#define MAX_GRASS_BUSHES ( MAX_GRASS_VERTS / 16 ) // one bush contain 4 poly, so we have 2048 bushes max per one surface
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#define GRASS_SKY_DIST BOGUS_RANGE // in-world grass never reach this value
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typedef struct grassentry_s
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{
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char name[16]; // name of level texture
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byte texture; // number in array of grass textures
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float density; // grass density (0 - 100)
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float min; // min grass scale
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float max; // max grass scale
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int seed; // seed for predictable random (auto-filled)
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} grassentry_t;
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typedef struct grasstexture_s
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{
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char name[256]; // path to grass texture
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int gl_texturenum; // gl-texture
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} grasstexture_t;
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typedef struct gvert_s
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{
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float center[4]; // used for rescale
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float normal[4]; // center + vertex[2] * vertex[3];
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float light[MAXLIGHTMAPS]; // packed color + unused entry
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float delux[MAXLIGHTMAPS]; // packed lightdir + unused entry
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byte styles[MAXLIGHTMAPS]; // styles on surface
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} gvert_t;
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#define FGRASS_NODRAW BIT( 0 ) // grass shader is failed to build
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#define FGRASS_NODLIGHT BIT( 1 ) // grass dlight shader is failed to build
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#define FGRASS_NOSUNLIGHT BIT( 2 ) // grass dlight shader is failed to build
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#define FRGASS_SKYENTITY BIT( 3 ) // it's sky grass
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// all the grassdata for one polygon and specified texture
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// stored into single vbo
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typedef struct grass_s
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{
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// shader cache
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shader_t forwardScene;
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shader_t forwardLightSpot;
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shader_t forwardLightOmni;
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shader_t forwardLightProj;
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shader_t deferredScene;
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shader_t deferredLight;
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shader_t forwardDepth;
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byte texture; // not a real texture just index into array
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byte flags; // state flags
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unsigned short numVerts; // for glDrawRangeElementsEXT
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unsigned short numElems; // for glDrawElements
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unsigned int vbo, vao, ibo; // buffer objects
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unsigned short hCachedMatrix; // HACKHACK: get matrices
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byte lights[MAXDYNLIGHTS];/// light numbers
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unsigned int cacheSize; // debug info: uploaded cache size for this buffer
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} grass_t;
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typedef void (*pfnCreateGrassBuffer)( grass_t *pOut, gvert_t *arrayxvert );
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typedef void (*pfnBindGrassBuffer)( grass_t *pOut, int attrFlags );
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enum
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{
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GRASSLOADER_BASE = 0,
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GRASSLOADER_BASEBUMP,
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GRASSLOADER_COUNT,
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};
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typedef struct
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{
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pfnCreateGrassBuffer CreateBuffer;
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pfnBindGrassBuffer BindBuffer;
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const char* BufferName; // debug
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} grass_loader_t;
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typedef struct grasshdr_s
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{
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Vector mins, maxs; // per-poly culling
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int count; // total bush count for this poly
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grass_t g[1]; // variable sized
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} grasshdr_t;
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extern void R_GrassInit( void );
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extern void R_GrassShutdown( void );
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extern void R_GrassInitForSurface( msurface_t *surf );
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extern void R_RenderGrassOnList( void );
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extern void R_GrassSetupFrame( void );
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extern void R_RenderShadowGrassOnList( void );
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extern void R_DrawLightForGrass( CDynLight *pl );
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extern void R_AddGrassToDrawList( msurface_t *s, drawlist_t type );
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extern void R_PrecacheGrass( msurface_t *s, mextraleaf_t *leaf );
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extern void R_RemoveGrassForSurface( mextrasurf_t *es );
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extern void R_UnloadFarGrass( void );
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#endif//GL_GRASS_H
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