r_sprite.c File Reference

#include "r_local.h"

Go to the source code of this file.

Functions
void	R_BuildPolygonFromSurface (msurface_t *fa)
void	R_PolygonCalculateGradients (void)
void	R_PolyChooseSpanletRoutine (float alpha, qboolean isturbulent)
void	R_ClipAndDrawPoly (float alpha, qboolean isturbulent, qboolean textured)
void	R_DrawSprite (void)

Variables
polydesc_t	r_polydesc
vec5_t	r_clip_verts [2][MAXWORKINGVERTS+2]

Function Documentation

R_BuildPolygonFromSurface()

void R_BuildPolygonFromSurface

(

msurface_t *

fa

)

Definition at line 1160 of file r_poly.c.

{
    int         i, lindex, lnumverts;
    medge_t     *pedges, *r_pedge;
    int         vertpage;
    float       *vec;
    vec5_t     *pverts;
    float       tmins[2] = { 0, 0 };
 
    r_polydesc.nump = 0;
 
    // reconstruct the polygon
    pedges = currentmodel->edges;
    lnumverts = fa->numedges;
    vertpage = 0;
 
    pverts = r_clip_verts[0];
 
    for (i = 0; i<lnumverts; i++)
    {
        lindex = currentmodel->surfedges[fa->firstedge + i];
 
        if (lindex > 0)
        {
            r_pedge = &pedges[lindex];
            vec = currentmodel->vertexes[r_pedge->v[0]].position;
        }
        else
        {
            r_pedge = &pedges[-lindex];
            vec = currentmodel->vertexes[r_pedge->v[1]].position;
        }
 
        VectorCopy(vec, pverts[i]);
    }
 
    VectorCopy(fa->texinfo->vecs[0], r_polydesc.vright);
    VectorCopy(fa->texinfo->vecs[1], r_polydesc.vup);
    VectorCopy(fa->plane->normal, r_polydesc.vpn);
    VectorCopy(r_origin, r_polydesc.viewer_position);
 
    if (fa->flags & SURF_PLANEBACK)
    {
        VectorSubtract(vec3_origin, r_polydesc.vpn, r_polydesc.vpn);
    }
 
    // PGM 09/16/98
    if (fa->texinfo->flags & (SURF_WARP | SURF_FLOWING))
    {
        r_polydesc.pixels = fa->texinfo->image->pixels[0];
        r_polydesc.pixel_width = fa->texinfo->image->width;
        r_polydesc.pixel_height = fa->texinfo->image->height;
    }
    // PGM 09/16/98
    else
    {
        surfcache_t *scache;
 
        scache = D_CacheSurface(fa, 0);
 
        r_polydesc.pixels = scache->data;
        r_polydesc.pixel_width = scache->width;
        r_polydesc.pixel_height = scache->height;
 
        tmins[0] = fa->texturemins[0];
        tmins[1] = fa->texturemins[1];
    }
 
    r_polydesc.dist = DotProduct(r_polydesc.vpn, pverts[0]);
 
    r_polydesc.s_offset = fa->texinfo->vecs[0][3] - tmins[0];
    r_polydesc.t_offset = fa->texinfo->vecs[1][3] - tmins[1];
 
    // scrolling texture addition
    if (fa->texinfo->flags & SURF_FLOWING)
    {
        r_polydesc.s_offset += -128 * ((r_newrefdef.time*0.25) - (int)(r_newrefdef.time*0.25));
    }
 
    r_polydesc.nump = lnumverts;
}

Referenced by R_DrawAlphaSurfaces().

R_ClipAndDrawPoly()

void R_ClipAndDrawPoly	(	float	alpha,
		qboolean	isturbulent,
		qboolean	textured
	)

Referenced by R_DrawSprite().

R_DrawSprite()

void R_DrawSprite

(

void

)

Definition at line 40 of file r_sprite.c.

{
    vec5_t      *pverts;
    vec3_t      left, up, right, down;
    dsprite_t   *s_psprite;
    dsprframe_t *s_psprframe;
 
 
    s_psprite = (dsprite_t *)currentmodel->extradata;
#if 0
    if (currententity->frame >= s_psprite->numframes
        || currententity->frame < 0)
    {
        ri.Con_Printf (PRINT_ALL, "No such sprite frame %i\n", 
            currententity->frame);
        currententity->frame = 0;
    }
#endif
    currententity->frame %= s_psprite->numframes;
 
    s_psprframe = &s_psprite->frames[currententity->frame];
 
    r_polydesc.pixels       = currentmodel->skins[currententity->frame]->pixels[0];
    r_polydesc.pixel_width  = s_psprframe->width;
    r_polydesc.pixel_height = s_psprframe->height;
    r_polydesc.dist         = 0;
 
    // generate the sprite's axes, completely parallel to the viewplane.
    VectorCopy (vup, r_polydesc.vup);
    VectorCopy (vright, r_polydesc.vright);
    VectorCopy (vpn, r_polydesc.vpn);
 
// build the sprite poster in worldspace
    VectorScale (r_polydesc.vright, 
        s_psprframe->width - s_psprframe->origin_x, right);
    VectorScale (r_polydesc.vup, 
        s_psprframe->height - s_psprframe->origin_y, up);
    VectorScale (r_polydesc.vright,
        -s_psprframe->origin_x, left);
    VectorScale (r_polydesc.vup,
        -s_psprframe->origin_y, down);
 
    // invert UP vector for sprites
    VectorInverse( r_polydesc.vup );
 
    pverts = r_clip_verts[0];
 
    pverts[0][0] = r_entorigin[0] + up[0] + left[0];
    pverts[0][1] = r_entorigin[1] + up[1] + left[1];
    pverts[0][2] = r_entorigin[2] + up[2] + left[2];
    pverts[0][3] = 0;
    pverts[0][4] = 0;
 
    pverts[1][0] = r_entorigin[0] + up[0] + right[0];
    pverts[1][1] = r_entorigin[1] + up[1] + right[1];
    pverts[1][2] = r_entorigin[2] + up[2] + right[2];
    pverts[1][3] = s_psprframe->width;
    pverts[1][4] = 0;
 
    pverts[2][0] = r_entorigin[0] + down[0] + right[0];
    pverts[2][1] = r_entorigin[1] + down[1] + right[1];
    pverts[2][2] = r_entorigin[2] + down[2] + right[2];
    pverts[2][3] = s_psprframe->width;
    pverts[2][4] = s_psprframe->height;
 
    pverts[3][0] = r_entorigin[0] + down[0] + left[0];
    pverts[3][1] = r_entorigin[1] + down[1] + left[1];
    pverts[3][2] = r_entorigin[2] + down[2] + left[2];
    pverts[3][3] = 0;
    pverts[3][4] = s_psprframe->height;
 
    r_polydesc.nump = 4;
    r_polydesc.s_offset = ( r_polydesc.pixel_width  >> 1);
    r_polydesc.t_offset = ( r_polydesc.pixel_height >> 1);
    VectorCopy( modelorg, r_polydesc.viewer_position );
 
    r_polydesc.stipple_parity = 1;
    if ( currententity->flags & RF_TRANSLUCENT )
        R_ClipAndDrawPoly ( currententity->alpha, false, true );
    else
        R_ClipAndDrawPoly ( 1.0F, false, true );
    r_polydesc.stipple_parity = 0;
}

Referenced by R_DrawEntitiesOnList().

R_PolyChooseSpanletRoutine()

void R_PolyChooseSpanletRoutine	(	float	alpha,
		qboolean	isturbulent
	)

R_PolygonCalculateGradients()

void R_PolygonCalculateGradients

(

void

)

Definition at line 1245 of file r_poly.c.

{
    vec3_t      p_normal, p_saxis, p_taxis;
    float       distinv;
 
    TransformVector(r_polydesc.vpn, p_normal);
    TransformVector(r_polydesc.vright, p_saxis);
    TransformVector(r_polydesc.vup, p_taxis);
 
    distinv = 1.0 / (-(DotProduct(r_polydesc.viewer_position, r_polydesc.vpn)) + r_polydesc.dist);
 
    d_sdivzstepu = p_saxis[0] * xscaleinv;
    d_sdivzstepv = -p_saxis[1] * yscaleinv;
    d_sdivzorigin = p_saxis[2] - xcenter * d_sdivzstepu - ycenter * d_sdivzstepv;
 
    d_tdivzstepu = p_taxis[0] * xscaleinv;
    d_tdivzstepv = -p_taxis[1] * yscaleinv;
    d_tdivzorigin = p_taxis[2] - xcenter * d_tdivzstepu - ycenter * d_tdivzstepv;
 
    d_zistepu = p_normal[0] * xscaleinv * distinv;
    d_zistepv = -p_normal[1] * yscaleinv * distinv;
    d_ziorigin = p_normal[2] * distinv - xcenter * d_zistepu - ycenter * d_zistepv;
 
    sadjust = (fixed16_t)((DotProduct(r_polydesc.viewer_position, r_polydesc.vright) + r_polydesc.s_offset) * 0x10000);
    tadjust = (fixed16_t)((DotProduct(r_polydesc.viewer_position, r_polydesc.vup) + r_polydesc.t_offset) * 0x10000);
 
    // -1 (-epsilon) so we never wander off the edge of the texture
    bbextents = (r_polydesc.pixel_width << 16) - 1;
    bbextentt = (r_polydesc.pixel_height << 16) - 1;
}

Referenced by R_DrawPoly().

Variable Documentation

r_clip_verts

vec5_t r_clip_verts[2][MAXWORKINGVERTS+2]

Definition at line 52 of file r_poly.c.

Referenced by R_BuildPolygonFromSurface(), R_ClipAndDrawPoly(), R_ClipPolyFace(), R_DrawSprite(), and R_IMFlatShadedQuad().

r_polydesc

polydesc_t r_polydesc

Definition at line 45 of file r_poly.c.

Referenced by R_BuildPolygonFromSurface(), R_ClipAndDrawPoly(), R_DrawPoly(), R_DrawSpanlet33Stipple(), R_DrawSpanlet66Stipple(), R_DrawSprite(), R_IMFlatShadedQuad(), R_PolygonCalculateGradients(), R_PolygonDrawSpans(), R_PolygonScanLeftEdge(), and R_PolygonScanRightEdge().