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shadow rendering optimizations

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git-svn-id: svn://svn.code.sf.net/p/actiongame/code/trunk/ac@2581 e016b1c5-ed68-44aa-a2f7-31cac88cffde
This commit is contained in:
Lee Salzman
2008-09-14 06:56:34 +00:00
parent 3eb590cb2f
commit 31ab7f4553
7 changed files with 438 additions and 264 deletions
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source/src/rendergl.cpp
-261
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@@ -830,267 +830,6 @@ void readdepth(int w, int h, vec &pos)
pos.z = (float)worldz;
}
VARP(stencilshadow, 0, 40, 100);
int stenciling = 0;
VAR(shadowcasters, 1, 0, 0);
#define SHADOWTILES 32
#define SHADOWTILEMASK (0xFFFFFFFFU>>(32-SHADOWTILES))
uint shadowtiles[SHADOWTILES+1];
float shadowx1 = 1, shadowy1 = 1, shadowx2 = -1, shadowy2 = -1;
bool addshadowtiles(float x1, float y1, float x2, float y2)
{
if(x1 >= 1 || y1 >= 1 || x2 <= -1 || y2 <= -1) return false;
shadowcasters++;
shadowx1 = min(shadowx1, max(x1, -1.0f));
shadowy1 = min(shadowy1, max(y1, -1.0f));
shadowx2 = max(shadowx2, min(x2, 1.0f));
shadowy2 = max(shadowy2, min(y2, 1.0f));
int tx1 = clamp(int((x1 + 1)/2 * SHADOWTILES), 0, SHADOWTILES - 1),
ty1 = clamp(int((y1 + 1)/2 * SHADOWTILES), 0, SHADOWTILES - 1),
tx2 = clamp(int((x2 + 1)/2 * SHADOWTILES), 0, SHADOWTILES - 1),
ty2 = clamp(int((y2 + 1)/2 * SHADOWTILES), 0, SHADOWTILES - 1);
uint mask = (SHADOWTILEMASK>>(SHADOWTILES - (tx2+1))) & (SHADOWTILEMASK<<tx1);
for(int y = ty1; y <= ty2; y++) shadowtiles[y] |= mask;
return true;
}
bool addshadowbox(const vec &bbmin, const vec &bbmax, const glmatrixf &mat)
{
vec4 v[8];
float sx1 = 1, sy1 = 1, sx2 = -1, sy2 = -1;
loopi(8)
{
vec p(i&1 ? bbmax.x : bbmin.x, i&2 ? bbmax.y : bbmin.y, i&4 ? bbmax.z : bbmin.z);
vec4 &pv = v[i];
mat.transform(p, pv);
if(pv.z >= 0)
{
float x = pv.x / pv.w, y = pv.y / pv.w;
sx1 = min(sx1, x);
sy1 = min(sy1, y);
sx2 = max(sx2, x);
sy2 = max(sy2, y);
}
}
if(sx1 >= sx2 || sy1 >= sy2) return false;
loopi(8)
{
const vec4 &p = v[i];
if(p.z >= 0) continue;
loopj(3)
{
const vec4 &o = v[i^(1<<j)];
if(o.z <= 0) continue;
float t = p.z/(p.z - o.z),
w = p.w + t*(o.w - p.w),
x = (p.x + t*(o.x - p.x))/w,
y = (p.y + t*(o.y - p.y))/w;
sx1 = min(sx1, x);
sy1 = min(sy1, y);
sx2 = max(sx2, x);
sy2 = max(sy2, y);
}
}
return addshadowtiles(sx1, sy1, sx2, sy2);
}
VAR(shadowclip, 0, 1, 1);
VAR(shadowtile, 0, 1, 1);
VAR(dbgtiles, 0, 0, 1);
void rendershadowtiles()
{
if(shadowx1 >= shadowx2 || shadowy1 >= shadowy2) return;
float clipx1 = (shadowx1 + 1) / 2,
clipy1 = (shadowy1 + 1) / 2,
clipx2 = (shadowx2 + 1) / 2,
clipy2 = (shadowy2 + 1) / 2;
if(!shadowclip)
{
clipx1 = clipy1 = 0;
clipx2 = clipy2 = 1;
}
if(!shadowtile)
{
glBegin(GL_QUADS);
glVertex2f(clipx1, clipy2);
glVertex2f(clipx2, clipy2);
glVertex2f(clipx2, clipy1);
glVertex2f(clipx1, clipy1);
glEnd();
return;
}
glBegin(GL_QUADS);
float tsz = 1.0f/SHADOWTILES;
loop(y, SHADOWTILES+1)
{
uint mask = shadowtiles[y];
int x = 0;
while(mask)
{
while(!(mask&0xFF)) { mask >>= 8; x += 8; }
while(!(mask&1)) { mask >>= 1; x++; }
int xstart = x;
do { mask >>= 1; x++; } while(mask&1);
uint strip = (SHADOWTILEMASK>>(SHADOWTILES - x)) & (SHADOWTILEMASK<<xstart);
int yend = y;
do { shadowtiles[yend] &= ~strip; yend++; } while((shadowtiles[yend] & strip) == strip);
float vx = xstart*tsz,
vy = y*tsz,
vw = (x-xstart)*tsz,
vh = (yend-y)*tsz,
vx1 = max(vx, clipx1),
vy1 = max(vy, clipy1),
vx2 = min(vx+vw, clipx2),
vy2 = min(vy+vh, clipy2);
glVertex2f(vx1, vy2);
glVertex2f(vx2, vy2);
glVertex2f(vx2, vy1);
glVertex2f(vx1, vy1);
}
}
glEnd();
}
void drawstencilshadows()
{
glDisable(GL_FOG);
glEnable(GL_STENCIL_TEST);
glDisable(GL_TEXTURE_2D);
glDepthMask(GL_FALSE);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
stenciling = 1;
shadowcasters = 0;
shadowx2 = shadowy2 = -1;
shadowx1 = shadowy1 = 1;
memset(shadowtiles, 0, sizeof(shadowtiles));
if((hasST2 || hasSTS) && hasSTW)
{
glDisable(GL_CULL_FACE);
if(hasST2)
{
glEnable(GL_STENCIL_TEST_TWO_SIDE_EXT);
glActiveStencilFace_(GL_BACK);
glStencilFunc(GL_ALWAYS, 0, ~0U);
glStencilOp(GL_KEEP, GL_KEEP, GL_DECR_WRAP_EXT);
glActiveStencilFace_(GL_FRONT);
glStencilFunc(GL_ALWAYS, 0, ~0U);
glStencilOp(GL_KEEP, GL_KEEP, GL_INCR_WRAP_EXT);
}
else
{
glStencilFuncSeparate_(GL_ALWAYS, GL_ALWAYS, 0, ~0U);
glStencilOpSeparate_(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR_WRAP_EXT);
glStencilOpSeparate_(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR_WRAP_EXT);
}
startmodelbatches();
renderentities();
renderclients();
renderbounceents();
endmodelbatches();
if(hasST2) glDisable(GL_STENCIL_TEST_TWO_SIDE_EXT);
glEnable(GL_CULL_FACE);
}
else
{
glStencilFunc(GL_ALWAYS, 0, ~0U);
glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
startmodelbatches();
renderentities();
renderclients();
renderbounceents();
endmodelbatches(false);
stenciling = 2;
glStencilFunc(GL_ALWAYS, 0, ~0U);
glStencilOp(GL_KEEP, GL_KEEP, GL_DECR);
glCullFace(GL_BACK);
endmodelbatches(true);
glCullFace(GL_FRONT);
}
stenciling = 0;
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
glDepthMask(GL_TRUE);
if(shadowcasters)
{
glDisable(GL_DEPTH_TEST);
glStencilFunc(GL_NOTEQUAL, 0, ~0U);
glStencilOp(GL_KEEP, GL_KEEP, GL_ZERO);
glEnable(GL_BLEND);
glBlendFunc(GL_ZERO, GL_SRC_COLOR);
float intensity = 1.0f - stencilshadow/100.0f;
glColor3f(intensity, intensity, intensity);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, 1, 0, 1, -1, 1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
static uint debugtiles[SHADOWTILES+1];
if(dbgtiles) memcpy(debugtiles, shadowtiles, sizeof(debugtiles));
rendershadowtiles();
if(dbgtiles)
{
glDisable(GL_STENCIL_TEST);
glColor3f(0.5f, 1, 0.5f);
memcpy(shadowtiles, debugtiles, sizeof(debugtiles));
rendershadowtiles();
glColor3f(0, 0, 1);
glDisable(GL_BLEND);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
memcpy(shadowtiles, debugtiles, sizeof(debugtiles));
rendershadowtiles();
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
}
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(fovy, aspect, 0.15f, farplane);
glMatrixMode(GL_MODELVIEW);
transplayer();
glEnable(GL_DEPTH_TEST);
}
glDisable(GL_BLEND);
glDisable(GL_STENCIL_TEST);
glEnable(GL_TEXTURE_2D);
}
void gl_drawframe(int w, int h, float changelod, float curfps)
{
drawminimap(w, h);