/**
* @brief GL_Cull
* @param[in] cullType
*/
void GL_Cull(int cullType)
{
if (backEnd.viewParms.isMirror)
{
GL_FrontFace(GL_CW);
}
else
{
GL_FrontFace(GL_CCW);
}
// allow culling to be disabled
if (r_noCull->integer)
{
glDisable(GL_CULL_FACE);
}
if (glState.faceCulling == cullType)
{
return;
}
glState.faceCulling = cullType;
if (cullType == CT_TWO_SIDED)
{
glDisable(GL_CULL_FACE);
}
else
{
glEnable(GL_CULL_FACE);
if (cullType == CT_BACK_SIDED)
{
GL_CullFace(GL_BACK);
}
else
{
GL_CullFace(GL_FRONT);
}
}
}
/*
=================
R_FlipModel
=================
*/
void R_FlipModel (qboolean on, qboolean cullOnly)
{
// TODO - optimize
if (on)
{
if (!cullOnly)
glScalef(1,-1,1);
GL_CullFace( GL_BACK );
}
else
{
if (!cullOnly)
glScalef(1,-1,1);
GL_CullFace( GL_FRONT );
}
}
static void R_DrawExplosion_TransparentCallback(const entity_render_t *ent, const rtlight_t *rtlight, int numsurfaces, int *surfacelist)
{
int surfacelistindex = 0;
const int numtriangles = EXPLOSIONTRIS, numverts = EXPLOSIONVERTS;
GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
GL_DepthMask(false);
GL_DepthRange(0, 1);
GL_PolygonOffset(r_refdef.polygonfactor, r_refdef.polygonoffset);
GL_DepthTest(true);
GL_CullFace(r_refdef.view.cullface_back);
R_EntityMatrix(&identitymatrix);
// R_Mesh_ResetTextureState();
R_SetupShader_Generic(explosiontexture, NULL, GL_MODULATE, 1, false, false, false);
for (surfacelistindex = 0;surfacelistindex < numsurfaces;surfacelistindex++)
{
const explosion_t *e = explosion + surfacelist[surfacelistindex];
// FIXME: this can't properly handle r_refdef.view.colorscale > 1
GL_Color(e->alpha * r_refdef.view.colorscale, e->alpha * r_refdef.view.colorscale, e->alpha * r_refdef.view.colorscale, 1);
R_Mesh_PrepareVertices_Generic_Arrays(numverts, e->vert[0], NULL, explosiontexcoord2f[0]);
R_Mesh_Draw(0, numverts, 0, numtriangles, NULL, NULL, 0, explosiontris[0], NULL, 0);
}
}
/*
=============
R_DrawAliasVolumeShadow
based on code from BeefQuake R6
=============
*/
void R_DrawAliasVolumeShadow (maliasmodel_t *paliashdr, vec3_t bbox[8])
{
vec3_t light, temp, vecAdd;
float dist, highest, lowest, projected_distance;
float angle, cosp, sinp, cosy, siny, cosr, sinr, ix, iy, iz;
int i, lnum;
dlight_t *dl;
dl = r_newrefdef.dlights;
VectorSet(vecAdd, 680,0,1024); // set base vector, was 576,0,1024
// compute average light vector from dlights
for (i=0, lnum=0; i<r_newrefdef.num_dlights; i++, dl++)
{
if (VectorCompare(dl->origin, currententity->origin))
continue;
VectorSubtract(dl->origin, currententity->origin, temp);
dist = dl->intensity - VectorLength(temp);
if (dist <= 0)
continue;
lnum++;
// Factor in the intensity of a dlight
VectorScale (temp, dist*0.25, temp);
VectorAdd (vecAdd, temp, vecAdd);
}
VectorNormalize(vecAdd);
VectorScale(vecAdd, 1024, vecAdd);
// get projection distance from lightspot height
highest = lowest = bbox[0][2];
for (i=0; i<8; i++) {
if (bbox[i][2] > highest) highest = bbox[i][2];
if (bbox[i][2] < lowest) lowest = bbox[i][2];
}
projected_distance = (fabs(highest - lightspot[2]) + (highest-lowest)) / vecAdd[2];
VectorCopy(vecAdd, light);
/*cosy = cos(-currententity->angles[YAW] / 180 * M_PI);
siny = sin(-currententity->angles[YAW] / 180 * M_PI);
ix = light[0], iy = light[1];
light[0] = (cosy * (ix - 0) + siny * (0 - iy) + 0);
light[1] = (cosy * (iy - 0) + siny * (ix - 0) + 0);
light[2] += 8;*/
// reverse-rotate light vector based on angles
angle = -currententity->angles[PITCH] / 180 * M_PI;
cosp = cos(angle), sinp = sin(angle);
angle = -currententity->angles[YAW] / 180 * M_PI;
cosy = cos(angle), siny = sin(angle);
angle = currententity->angles[ROLL] / 180 * M_PI; // roll is backwards
cosr = cos(angle), sinr = sin(angle);
// rotate for yaw (z axis)
ix = light[0], iy = light[1];
light[0] = cosy * ix - siny * iy + 0;
light[1] = siny * ix + cosy * iy + 0;
// rotate for pitch (y axis)
ix = light[0], iz = light[2];
light[0] = cosp * ix + 0 + sinp * iz;
light[2] = -sinp * ix + 0 + cosp * iz;
// rotate for roll (x axis)
iy = light[1], iz = light[2];
light[1] = 0 + cosr * iy - sinr * iz;
light[2] = 0 + sinr * iy + cosr * iz;
// set up stenciling
if (!r_shadowvolumes->value)
{
qglPushAttrib(GL_STENCIL_BUFFER_BIT); // save stencil buffer
qglClear(GL_STENCIL_BUFFER_BIT);
qglColorMask(0,0,0,0);
GL_DepthMask(0);
GL_DepthFunc(GL_LESS);
GL_Enable(GL_STENCIL_TEST);
qglStencilFunc(GL_ALWAYS, 0, 255);
// qglStencilOp (GL_KEEP, GL_KEEP, GL_KEEP);
// qglStencilMask (255);
}
// build shadow volumes and render each to stencil buffer
for (i=0; i<paliashdr->num_meshes; i++)
{
if (paliashdr->meshes[i].skins[currententity->skinnum].renderparms.nodraw
|| paliashdr->meshes[i].skins[currententity->skinnum].renderparms.alphatest
|| paliashdr->meshes[i].skins[currententity->skinnum].renderparms.noshadow)
continue;
R_BuildShadowVolume (paliashdr, i, light, projected_distance, r_shadowvolumes->value);
GL_LockArrays (shadow_va);
if (!r_shadowvolumes->value)
{
if (gl_config.atiSeparateStencil && gl_config.extStencilWrap) // Barnes ATI stenciling
{
GL_Disable(GL_CULL_FACE);
qglStencilOpSeparateATI (GL_BACK, GL_KEEP, GL_INCR_WRAP_EXT, GL_KEEP);
qglStencilOpSeparateATI (GL_FRONT, GL_KEEP, GL_DECR_WRAP_EXT, GL_KEEP);
R_DrawShadowVolume ();
GL_Enable(GL_CULL_FACE);
}
else if (gl_config.extStencilTwoSide && gl_config.extStencilWrap) // Echon's two-sided stenciling
{
GL_Disable(GL_CULL_FACE);
qglEnable (GL_STENCIL_TEST_TWO_SIDE_EXT);
qglActiveStencilFaceEXT (GL_BACK);
qglStencilOp (GL_KEEP, GL_INCR_WRAP_EXT, GL_KEEP);
qglActiveStencilFaceEXT (GL_FRONT);
qglStencilOp (GL_KEEP, GL_DECR_WRAP_EXT, GL_KEEP);
R_DrawShadowVolume ();
qglDisable (GL_STENCIL_TEST_TWO_SIDE_EXT);
GL_Enable(GL_CULL_FACE);
}
else
{ // increment stencil if backface is behind depthbuffer
GL_CullFace(GL_BACK); // quake is backwards, this culls front faces
qglStencilOp(GL_KEEP, GL_INCR, GL_KEEP);
R_DrawShadowVolume ();
// decrement stencil if frontface is behind depthbuffer
GL_CullFace(GL_FRONT); // quake is backwards, this culls back faces
qglStencilOp(GL_KEEP, GL_DECR, GL_KEEP);
R_DrawShadowVolume ();
}
}
else
R_DrawShadowVolume ();
GL_UnlockArrays ();
}
// end stenciling and draw stenciled volume
if (!r_shadowvolumes->value)
{
GL_CullFace(GL_FRONT);
GL_Disable(GL_STENCIL_TEST);
GL_DepthFunc(GL_LEQUAL);
GL_DepthMask(1);
qglColorMask(1,1,1,1);
// draw shadows for this model now
R_ShadowBlend (aliasShadowAlpha * currententity->alpha); // was r_shadowalpha->value
qglPopAttrib(); // restore stencil buffer
}
}
