void CShadowHandler::CreateShadows(void)
{
fb.Bind();
glDisable(GL_BLEND);
glDisable(GL_LIGHTING);
glDisable(GL_ALPHA_TEST);
glDisable(GL_TEXTURE_2D);
glShadeModel(GL_FLAT);
glColor4f(1, 1, 1, 1);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glViewport(0,0,shadowMapSize,shadowMapSize);
//glClearColor(0, 0, 0, 0);
//glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glClear(GL_DEPTH_BUFFER_BIT);
firstDraw=false;
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0,1,0,1,0,-1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
float3 sundir=mapInfo->light.sunDir;
cross1=(sundir.cross(UpVector)).ANormalize();
cross2=cross1.cross(sundir);
centerPos=camera->pos;
// centerPos.x=((int)((centerPos.x+4)/8))*8;
// centerPos.y=((int)((centerPos.y+4)/8))*8;
// centerPos.z=((int)((centerPos.z+4)/8))*8;
// centerPos.y=(ground->GetHeight(centerPos.x,centerPos.z));
CalcMinMaxView();
//it should be possible to tweak a bit more shadow map resolution from this
float maxLength=12000;
float maxLengthX=(x2-x1)*1.5f;
float maxLengthY=(y2-y1)*1.5f;
xmid=1-(sqrt(fabs(x2))/(sqrt(fabs(x2))+sqrt(fabs(x1))));
ymid=1-(sqrt(fabs(y2))/(sqrt(fabs(y2))+sqrt(fabs(y1))));
//logOutput.Print("%.0f %.0f %.2f %.0f",y1,y2,ymid,maxLengthY);
shadowMatrix[0]=cross1.x/maxLengthX;
shadowMatrix[4]=cross1.y/maxLengthX;
shadowMatrix[8]=cross1.z/maxLengthX;
shadowMatrix[12]=-(cross1.dot(centerPos))/maxLengthX;
shadowMatrix[1]=cross2.x/maxLengthY;
shadowMatrix[5]=cross2.y/maxLengthY;
shadowMatrix[9]=cross2.z/maxLengthY;
shadowMatrix[13]=-(cross2.dot(centerPos))/maxLengthY;
shadowMatrix[2]=-sundir.x/maxLength;
shadowMatrix[6]=-sundir.y/maxLength;
shadowMatrix[10]=-sundir.z/maxLength;
shadowMatrix[14]=(centerPos.x*sundir.x+centerPos.z*sundir.z)/maxLength+0.5f;
glLoadMatrixf(shadowMatrix.m);
glProgramEnvParameter4fARB(GL_VERTEX_PROGRAM_ARB,16, xmid,ymid,0,0); //these registers should not be overwritten by anything
GetShadowMapSizeFactors(p17, p18);
glProgramEnvParameter4fARB(GL_VERTEX_PROGRAM_ARB,17, p17,p17,0.0f,0.0f); //these registers should not be overwritten by anything
glProgramEnvParameter4fARB(GL_VERTEX_PROGRAM_ARB,18, p18,p18,0.0f,0.0f); //these registers should not be overwritten by anything
float3 oldup=camera->up;
camera->right=shadowHandler->cross1;
camera->up=shadowHandler->cross2;
camera->pos2=camera->pos+sundir*8000;
DrawShadowPasses();
camera->up=oldup;
camera->pos2=camera->pos;
shadowMatrix[14]-=0.00001f;
glShadeModel(GL_SMOOTH);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
fb.Unbind();
glViewport(gu->viewPosX,0,gu->viewSizeX,gu->viewSizeY);
}
void CShadowHandler::CreateShadows(void)
{
fb.Bind();
glDisable(GL_BLEND);
glDisable(GL_LIGHTING);
glDisable(GL_ALPHA_TEST);
glDisable(GL_TEXTURE_2D);
glShadeModel(GL_FLAT);
glColor4f(1, 1, 1, 1);
glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
glDepthMask(GL_TRUE);
glEnable(GL_DEPTH_TEST);
glViewport(0, 0, shadowMapSize, shadowMapSize);
// glClearColor(0, 0, 0, 0);
// glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glClear(GL_DEPTH_BUFFER_BIT);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, 1, 0, 1, 0, -1);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
cross1 = (mapInfo->light.sunDir.cross(UpVector)).ANormalize();
cross2 = cross1.cross(mapInfo->light.sunDir);
centerPos = camera->pos;
//! derive the size of the shadow-map from the
//! intersection points of the camera frustum
//! with the xz-plane
CalcMinMaxView();
SetShadowMapSizeFactors();
// it should be possible to tweak a bit more shadow map resolution from this
const float maxLength = 12000.0f;
const float maxLengthX = (x2 - x1) * 1.5f;
const float maxLengthY = (y2 - y1) * 1.5f;
#if (SHADOWMATRIX_NONLINEAR == 1)
xmid = 1.0f - (sqrt(fabs(x2)) / (sqrt(fabs(x2)) + sqrt(fabs(x1))));
ymid = 1.0f - (sqrt(fabs(y2)) / (sqrt(fabs(y2)) + sqrt(fabs(y1))));
#else
xmid = 0.5f;
ymid = 0.5f;
#endif
shadowMatrix[ 0] = cross1.x / maxLengthX;
shadowMatrix[ 4] = cross1.y / maxLengthX;
shadowMatrix[ 8] = cross1.z / maxLengthX;
shadowMatrix[12] = -(cross1.dot(centerPos)) / maxLengthX;
shadowMatrix[ 1] = cross2.x / maxLengthY;
shadowMatrix[ 5] = cross2.y / maxLengthY;
shadowMatrix[ 9] = cross2.z / maxLengthY;
shadowMatrix[13] = -(cross2.dot(centerPos)) / maxLengthY;
shadowMatrix[ 2] = -mapInfo->light.sunDir.x / maxLength;
shadowMatrix[ 6] = -mapInfo->light.sunDir.y / maxLength;
shadowMatrix[10] = -mapInfo->light.sunDir.z / maxLength;
shadowMatrix[14] = ((centerPos.x * mapInfo->light.sunDir.x + centerPos.z * mapInfo->light.sunDir.z) / maxLength) + 0.5f;
glLoadMatrixf(shadowMatrix.m);
//! set the shadow-parameter registers
//! NOTE: so long as any part of Spring rendering still uses
//! ARB programs at run-time, these lines can not be removed
//! (all ARB programs share the same environment)
glProgramEnvParameter4fARB(GL_VERTEX_PROGRAM_ARB, 16, xmid, ymid, 0.0f, 0.0f);
glProgramEnvParameter4fARB(GL_VERTEX_PROGRAM_ARB, 17, p17, p17, 0.0f, 0.0f);
glProgramEnvParameter4fARB(GL_VERTEX_PROGRAM_ARB, 18, p18, p18, 0.0f, 0.0f);
if (globalRendering->haveGLSL) {
for (int i = 0; i < SHADOWGEN_PROGRAM_LAST; i++) {
shadowGenProgs[i]->Enable();
shadowGenProgs[i]->SetUniform4f(0, xmid, ymid, p17, p18);
shadowGenProgs[i]->Disable();
}
}
//! move view into sun-space
float3 oldup = camera->up;
camera->right = cross1;
camera->up = cross2;
camera->pos2 = camera->pos + mapInfo->light.sunDir * 8000;
DrawShadowPasses();
camera->up = oldup;
camera->pos2 = camera->pos;
shadowMatrix[14] -= 0.00001f;
glShadeModel(GL_SMOOTH);
glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
//we do this later to save render context switches (this is one of the slowest opengl operations!)
//fb.Unbind();
//glViewport(globalRendering->viewPosX,0,globalRendering->viewSizeX,globalRendering->viewSizeY);
}
