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Shadow volume render mode support

This commit is contained in:
zeromus 2008-08-26 05:13:28 +00:00
parent 85c879351b
commit 4d4bebc1fe
1 changed files with 34 additions and 1 deletions
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35
desmume/src/windows/OGLRender.c
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@ -86,6 +86,7 @@ static unsigned short matrixMode[2] = {GL_PROJECTION, GL_MODELVIEW};
static short mode = 0;
static int colorAlpha=0;
static unsigned int polyID=0;
static unsigned int depthFuncMode=0;
static unsigned int lightMask=0;
static unsigned int envMode=0;
@ -983,12 +984,14 @@ __forceinline void setTexture(unsigned int format, unsigned int texpal)
texcache[i].sizeX, texcache[i].sizeY, 0,
GL_RGBA, GL_UNSIGNED_BYTE, texMAP);
//============================================================================================
texcache_count=i;
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, texEnv[texcache[i].texenv]);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, (BIT16(texcache[i].frm) ? (BIT18(texcache[i].frm)?GL_MIRRORED_REPEAT:GL_REPEAT) : GL_CLAMP));
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, (BIT17(texcache[i].frm) ? (BIT18(texcache[i].frm)?GL_MIRRORED_REPEAT:GL_REPEAT) : GL_CLAMP));
texcache_count=i;
}
__forceinline void NDS_glBegin(unsigned long v)
@ -1073,6 +1076,33 @@ __forceinline void NDS_glBegin(unsigned long v)
if(textureMode ==1 || textureMode == 6)
enableDepthWrite = alphaDepthWrite;
//handle shadow polys
if(envMode == 3)
{
glEnable(GL_STENCIL_TEST);
if(polyID == 0) {
//when the polyID is zero, we are writing the shadow mask.
//set stencilbuf = 1 where the shadow volume is obstructed by geometry.
//do not write color or depth information.
glStencilFunc(GL_ALWAYS,1,1);
glStencilOp(GL_KEEP,GL_REPLACE,GL_KEEP);
glColorMask(GL_FALSE,GL_FALSE,GL_FALSE,GL_FALSE);
enableDepthWrite = 1;
} else {
//when the polyid is nonzero, we are drawing the shadow poly.
//only draw the shadow poly where the stencilbuf==1.
//I am not sure whether to update the depth buffer here--so I chose not to.
glStencilFunc(GL_EQUAL,1,1);
glStencilOp(GL_KEEP,GL_KEEP,GL_KEEP);
glColorMask(GL_TRUE,GL_TRUE,GL_TRUE,GL_TRUE);
enableDepthWrite = 0;
}
} else {
glDisable(GL_STENCIL_TEST);
glColorMask(GL_TRUE,GL_TRUE,GL_TRUE,GL_TRUE);
}
glDepthMask(enableDepthWrite?GL_TRUE:GL_FALSE);
glMatrixMode(GL_PROJECTION);
@ -1258,6 +1288,9 @@ __forceinline void NDS_glPolygonAttrib (unsigned long val)
// Alpha value, actually not well handled, 0 should be wireframe
colorAlpha = ((val>>16)&0x1F)<<26;
//printlog("PolygonID=%i;\n",val>>24);
// polyID
polyID = (val>>24)&0x1F;
}
/*