Pseudoinstanced grass generation and rendering. More...

#include "r_local.h"
#include "r_grass.h"

Include dependency graph for r_grass.cpp:

Data Structures
struct	Clump

Macros
#define	GRASS_MARK -956 /* arbitrary number from top of my head -- Sandro */
#define	TRIS_PER_CLUMP 10
#define	MAX_CLUMPS 2046
#define	MAX_CLUMP_TRIS (TRIS_PER_CLUMP * MAX_CLUMPS)
#define	xt (rot[0])
#define	yt (rot[1])
#define	zt (rot[2])

Functions
void	R_ClearGrass ()
static void	R_PlantGrass (Clump &clump)
static void	R_AddClump (const vec3_t pos, const vec3_t normal, int level)
static int	ClumpOrder (const void a, const void b)
static void	R_OrganizeClumps ()
void	R_GenerateGrass ()
void	R_DrawGrass ()

Variables
static int	clumpCount = 0
static Clump	clumps [MAX_CLUMPS]
static int	clumpsForLevel [PATHFINDING_HEIGHT] = {0}
static int	clumpTrianglesForLevel [PATHFINDING_HEIGHT] = {0}
static int	clumpTriangleCount = 0
static vec3_t	gfv_pos [MAX_CLUMP_TRIS *3]
static vec2_t	gfv_texcoord [MAX_CLUMP_TRIS *3]

Detailed Description

Pseudoinstanced grass generation and rendering.

Definition in file r_grass.cpp.

Macro Definition Documentation

◆ GRASS_MARK

#define GRASS_MARK -956 /* arbitrary number from top of my head -- Sandro */

Definition at line 29 of file r_grass.cpp.

Referenced by R_GenerateGrass().

◆ MAX_CLUMP_TRIS

#define MAX_CLUMP_TRIS (TRIS_PER_CLUMP * MAX_CLUMPS)

Definition at line 34 of file r_grass.cpp.

Referenced by R_PlantGrass().

◆ MAX_CLUMPS

#define MAX_CLUMPS 2046

Definition at line 32 of file r_grass.cpp.

Referenced by R_AddClump(), and R_GenerateGrass().

◆ TRIS_PER_CLUMP

#define TRIS_PER_CLUMP 10

Definition at line 31 of file r_grass.cpp.

Referenced by R_PlantGrass().

◆ xt

#define xt (rot[0])

Referenced by R_PlantGrass().

◆ yt

#define yt (rot[1])

Referenced by R_PlantGrass().

◆ zt

#define zt (rot[2])

Referenced by R_PlantGrass().

Function Documentation

◆ ClumpOrder()

int ClumpOrder	(	const void *	a,
		const void *	b )

static

Todo: Morton order comparison to improve clusterization after sorting (beware the black magic)

Definition at line 199 of file r_grass.cpp.

References Clump::level.

Referenced by R_OrganizeClumps().

◆ R_AddClump()

void R_AddClump	(	const vec3_t	pos,
		const vec3_t	normal,
		int	level )

static

Definition at line 183 of file r_grass.cpp.

References clumpCount, clumps, frand(), Clump::level, level, MAX_CLUMPS, Clump::normal, Clump::position, Clump::rotation, and VectorCopy.

Referenced by R_GenerateGrass().

◆ R_ClearGrass()

void R_ClearGrass ( )

Definition at line 56 of file r_grass.cpp.

References clumpCount, clumpsForLevel, clumpTriangleCount, clumpTrianglesForLevel, and OBJZERO.

Referenced by R_ModBeginLoading().

◆ R_DrawGrass()

void R_DrawGrass ( )

Definition at line 399 of file r_grass.cpp.

References clumpTriangleCount, clumpTrianglesForLevel, gfv_pos, gfv_texcoord, it_pic, R_BindArray(), R_BindDefaultArray(), R_BindTexture, R_EnableAlphaTest(), R_FindImage(), and refdef.

Referenced by R_RenderFrame().

◆ R_GenerateGrass()

void R_GenerateGrass ( )

Todo: sometimes rounding error makes it to plant an extra clump which may overrun the vertex array, thus causing problems with OpenGL driver, should be fixed

Definition at line 228 of file r_grass.cpp.

References clumpCount, clumps, clumpsForLevel, clumpTriangleCount, clumpTrianglesForLevel, Com_Printf(), CrossProduct(), mBspHeader_t::firstface, Clump::firstTriangle, mBspSurface_t::firstTriangle, mBspTexInfo_t::flags, mBspSurface_t::frame, frand(), GRASS_MARK, i, mBspModel_t::indexes, level, LEVEL_LASTVISIBLE, MAX_CLUMPS, cBspPlane_t::normal, mBspHeader_t::numfaces, Clump::numTriangles, mBspSurface_t::numTriangles, PATHFINDING_HEIGHT, mBspSurface_t::plane, R_AddClump(), r_mapTiles, r_numMapTiles, R_OrganizeClumps(), R_PlantGrass(), mBspModel_t::submodels, SURF_FOLIAGE, mBspModel_t::surfaces, mBspSurface_t::texinfo, v, va(), VectorCopy, VectorLength(), VectorMA(), VectorSubtract, and mBspModel_t::verts.