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ray:: volumetric raycasting

This commit is contained in:
Zeno Rogue 2020-07-07 22:16:38 +02:00
parent 3c8d5979f1
commit 17e056cdb4
1 changed files with 109 additions and 8 deletions
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117
raycaster.cpp
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@ -15,7 +15,7 @@ EX namespace ray {
#if CAP_RAY
/** texture IDs */
GLuint txConnections = 0, txWallcolor = 0, txTextureMap = 0;
GLuint txConnections = 0, txWallcolor = 0, txTextureMap = 0, txVolumetric = 0;
EX bool in_use;
EX bool comparison_mode;
@ -101,7 +101,7 @@ EX bool requested() {
struct raycaster : glhr::GLprogram {
GLint uStart, uStartid, uM, uLength, uFovX, uFovY, uIPD, uShift;
GLint uWallstart, uWallX, uWallY;
GLint tConnections, tWallcolor, tTextureMap;
GLint tConnections, tWallcolor, tTextureMap, tVolumetric;
GLint uBinaryWidth, uPLevel, uLP, uStraighten, uReflectX, uReflectY;
GLint uLinearSightRange, uExpStart, uExpDecay;
GLint uBLevel;
@ -143,6 +143,7 @@ raycaster::raycaster(string vsh, string fsh) : GLprogram(vsh, fsh) {
tConnections = glGetUniformLocation(_program, "tConnections");
tWallcolor = glGetUniformLocation(_program, "tWallcolor");
tTextureMap = glGetUniformLocation(_program, "tTextureMap");
tVolumetric = glGetUniformLocation(_program, "tVolumetric");
uWallOffset = glGetUniformLocation(_program, "uWallOffset");
uSides = glGetUniformLocation(_program, "uSides");
@ -232,6 +233,7 @@ void enable_raycaster() {
"uniform mediump vec2 uStartid;\n"
"uniform mediump sampler2D tConnections;\n"
"uniform mediump sampler2D tWallcolor;\n"
"uniform mediump sampler2D tVolumetric;\n"
"uniform mediump sampler2D tTexture;\n"
"uniform mediump sampler2D tTextureMap;\n"
"uniform mediump vec4 uWallX["+rays+"];\n"
@ -844,10 +846,21 @@ void enable_raycaster() {
"}\n";
}
fmain += " go = go + dist;\n";
if(volumetric::on) fmain +=
"if(dist > 0. && go < " + to_glsl(hard_limit) + ") {\n"
" if(dist > "+to_glsl(hard_limit)+" - go) dist = "+to_glsl(hard_limit)+" - go;\n"
" mediump float d = uExpStart * exp(-go / uExpDecay);\n"
" mediump vec4 col = texture2D(tVolumetric, cid);\n"
" mediump float factor = col.w; col.w = 1.;\n"
" mediump float frac = (1.-exp(-(factor + 1. / uExpDecay) * dist));\n"
" col = frac * (col * d + uFogColor * (1.-d));\n"
" gl_FragColor += left * col;\n"
" }\n;";
fmain += " go = go + dist;\n";
fmain += "if(which == -1) continue;\n";
if(prod) fmain += "position.w = -zpos;\n";
if(reg3::ultra_mirror_in()) fmain +=
@ -874,8 +887,14 @@ void enable_raycaster() {
" col.xyz *= texture2D(tTexture, inface2).rgb;\n"
" }\n";
if(volumetric::on)
fmain += " mediump float d = uExpStart * exp(-go / uExpDecay);\n";
else
fmain +=
" mediump float d = max(1. - go / uLinearSightRange, uExpStart * exp(-go / uExpDecay));\n";
fmain +=
" mediump float d = max(1. - go / uLinearSightRange, uExpStart * exp(-go / uExpDecay));\n"
" col.xyz = col.xyz * d + uFogColor.xyz * (1.-d);\n";
if(nil) fmain +=
@ -1231,9 +1250,19 @@ EX void cast() {
vector<array<float, 4>> connections(length * rows);
vector<array<float, 4>> wallcolor(length * rows);
vector<array<float, 4>> texturemap(length * rows);
vector<array<float, 4>> volumetric(length * rows);
if(1) for(cell *c: lst) {
int id = ids[c];
auto& vmap = volumetric::vmap;
if(volumetric::on && vmap.count(c) && (vmap[c] & 0xFF)) {
celldrawer dd;
dd.c = c;
dd.setcolors();
int u = (id/per_row*length) + (id%per_row * deg);
color_t vcolor = (dd.fcol << 8) | vmap[c];
volumetric[u] = glhr::acolor(vcolor);
}
forCellIdEx(c1, i, c) {
int u = (id/per_row*length) + (id%per_row * deg) + i;
if(!ids.count(c1)) {
@ -1344,8 +1373,11 @@ EX void cast() {
if(o->uBLevel != -1)
glUniform1f(o->uBLevel, log(bt::expansion()) / 2);
glUniform1f(o->uLinearSightRange, sightranges[geometry]);
if(o->uLinearSightRange != -1)
glUniform1f(o->uLinearSightRange, sightranges[geometry]);
glUniform1f(o->uExpDecay, exp_decay_current());
glUniform1f(o->uExpStart, exp_start);
@ -1357,6 +1389,7 @@ EX void cast() {
bind_array(wallcolor, o->tWallcolor, txWallcolor, 4);
bind_array(connections, o->tConnections, txConnections, 3);
bind_array(texturemap, o->tTextureMap, txTextureMap, 5);
if(volumetric::on) bind_array(volumetric, o->tVolumetric, txVolumetric, 6);
auto cols = glhr::acolor(darkena(backcolor, 0, 0xFF));
glUniform4f(o->uFogColor, cols[0], cols[1], cols[2], cols[3]);
@ -1379,6 +1412,71 @@ EX void cast() {
GLERR("finish");
}
EX namespace volumetric {
EX bool on;
EX map<cell*, color_t> vmap;
int intensity = 16;
EX void enable() {
if(!on) {
on = true;
reset_raycaster();
}
}
EX void random_fog() {
enable();
for(cell *c: currentmap->allcells())
vmap[c] = ((rand() % 0x1000000) << 8) | intensity;
}
EX void menu() {
cmode = sm::SIDE | sm::MAYDARK;
gamescreen(0);
dialog::init(XLAT("volumetric raycasting"));
dialog::addBoolItem(XLAT("active"), on, 'a');
dialog::add_action([&] {
on = !on;
reset_raycaster();
});
dialog::addSelItem(XLAT("intensity of random coloring"), its(intensity), 'i');
dialog::add_action([] {
dialog::editNumber(intensity, 0, 255, 5, 15, "", "");
dialog::reaction = random_fog;
});
dialog::addItem(XLAT("color randomly"), 'r');
dialog::add_action(random_fog);
dialog::addColorItem("color cell under cursor", vmap.count(centerover) ? vmap[centerover] : 0, 'c');
dialog::add_action([&] {
enable();
dialog::openColorDialog(vmap[centerover]);
dialog::dialogflags |= sm::SIDE;
});
dialog::addColorItem("color cell under player", vmap.count(cwt.at) ? vmap[cwt.at] : 0, 'p');
dialog::add_action([&] {
enable();
dialog::openColorDialog(vmap[cwt.at]);
dialog::dialogflags |= sm::SIDE;
});
dialog::addBreak(150);
dialog::addHelp("This fills all the cells with glowing fog, for cool visualizations");
dialog::addBreak(150);
dialog::addBack();
dialog::display();
}
EX }
EX void configure() {
cmode = sm::SIDE | sm::MAYDARK;
gamescreen(0);
@ -1448,7 +1546,10 @@ EX void configure() {
dialog::reaction = reset_raycaster;
});
}
dialog::addBoolItem(XLAT("volumetric raytracing"), volumetric::on, 'v');
dialog::add_action_push(volumetric::menu);
dialog::addSelItem(XLAT("iterations"), its(max_iter_current()), 's');
dialog::add_action([&] {
dialog::editNumber(max_iter_current(), 0, 600, 1, 60, XLAT("iterations"), "in H3/H2xE/E3 this is the number of cell boundaries; in nonisotropic, the number of simulation steps");