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hyperrogue/shaders.cpp

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// Hyperbolic Rogue -- shaders
// Copyright (C) 2011-2019 Zeno Rogue, see 'hyper.cpp' for details
/** \file shaders.cpp
* \brief shaders
*/
#include "hyper.h"
namespace hr {
EX ld levellines;
EX bool disable_texture;
#if CAP_GL
#if HDR
constexpr flagtype GF_TEXTURE = 1;
constexpr flagtype GF_VARCOLOR = 2;
constexpr flagtype GF_LIGHTFOG = 4;
constexpr flagtype GF_LEVELS = 8;
constexpr flagtype GF_TEXTURE_SHADED = 16;
constexpr flagtype GF_which = 31;
constexpr flagtype SF_PERS3 = 256;
constexpr flagtype SF_BAND = 512;
constexpr flagtype SF_USE_ALPHA = 1024;
constexpr flagtype SF_DIRECT = 2048;
constexpr flagtype SF_PIXELS = 4096;
constexpr flagtype SF_HALFPLANE = 8192;
constexpr flagtype SF_ORIENT = 16384;
constexpr flagtype SF_BOX = 32768;
constexpr flagtype SF_ZFOG = 65536;
constexpr flagtype SF_ODSBOX = (1<<17);
#endif
EX bool solv_all;
#if HDR
/* standard attribute bindings */
/* taken from: https://www.opengl.org/sdk/docs/tutorials/ClockworkCoders/attributes.php */
constexpr int aPosition = 0;
constexpr int aColor = 3;
constexpr int aTexture = 8;
/* texture bindings */
constexpr int INVERSE_EXP_BINDING = 2;
#endif
EX map<string, shared_ptr<glhr::GLprogram>> compiled_programs;
EX map<unsigned, shared_ptr<glhr::GLprogram>> matched_programs;
glhr::glmatrix model_orientation_gl() {
glhr::glmatrix s = glhr::id;
for(int a=0; a<GDIM; a++)
models::apply_orientation(s[a][1], s[a][0]);
if(GDIM == 3) for(int a=0; a<GDIM; a++)
models::apply_orientation_yz(s[a][2], s[a][1]);
return s;
}
shared_ptr<glhr::GLprogram> write_shader(flagtype shader_flags) {
string varying, vsh, fsh, vmain = "void main() {\n", fmain = "void main() {\n";
vsh += "attribute mediump vec4 aPosition;\n";
varying += "varying mediump vec4 vColor;\n";
fmain += "gl_FragColor = vColor;\n";
if(shader_flags & GF_TEXTURE_SHADED) {
vsh += "attribute mediump vec3 aTexture;\n";
varying += "varying mediump vec3 vTexCoord;\n";
fsh += "uniform mediump sampler2D tTexture;\n";
vmain += "vTexCoord = aTexture;\n";
fmain += "gl_FragColor *= texture2D(tTexture, vTexCoord.xy);\n";
fmain += "gl_FragColor.rgb *= vTexCoord.z;\n";
}
else if(shader_flags & GF_TEXTURE) {
vsh += "attribute mediump vec2 aTexture;\n";
varying += "varying mediump vec2 vTexCoord;\n";
fsh += "uniform mediump sampler2D tTexture;\n";
vmain += "vTexCoord = aTexture;\n",
fmain += "gl_FragColor *= texture2D(tTexture, vTexCoord);\n";
}
if(shader_flags & GF_LEVELS) {
fsh += "uniform mediump float uLevelLines;\n";
varying += "varying mediump vec4 vPos;\n";
fmain += "gl_FragColor.rgb *= 0.5 + 0.5 * cos(vPos.z/vPos.w * uLevelLines * 2. * PI);\n";
}
if(shader_flags & GF_VARCOLOR) {
vsh += "attribute mediump vec4 aColor;\n";
vmain += "vColor = aColor;\n";
}
else {
vmain += "vColor = uColor;\n";
vsh += "uniform mediump vec4 uColor;\n";
}
if(shader_flags & GF_LIGHTFOG) {
vmain += "mediump float fogx = clamp(1.0 + aPosition.z * uFog, 0.0, 1.0); vColor = vColor * fogx + uFogColor * (1.0-fogx);\n";
vsh += "uniform mediump float uFog;\n";
vsh += "uniform mediump vec4 uFogColor;\n";
}
string coordinator;
string distfun;
bool treset = false;
bool dim2 = GDIM == 2;
bool dim3 = GDIM == 3;
bool skip_t = false;
if(vid.stereo_mode == sODS) {
shader_flags |= SF_DIRECT | SF_ODSBOX;
vmain += "// this is ODS shader\n";
distfun = "aPosition.z";
}
else if(pmodel == mdPixel) {
vmain += "mediump vec4 pos = aPosition; pos[3] = 1.0;\n";
vmain += "pos = uMV * pos;\n";
if(shader_flags & GF_LEVELS) vmain += "vPos = pos;\n";
vmain += "gl_Position = uP * pos;\n";
skip_t = true;
shader_flags |= SF_PIXELS | SF_DIRECT;
}
else if(pmodel == mdManual) {
vmain += "mediump vec4 pos = uMV * aPosition;\n";
if(shader_flags & GF_LEVELS)
vmain += "vPos = pos;\n";
vmain += "gl_Position = uP * pos;\n";
skip_t = true;
shader_flags |= SF_DIRECT;
}
else if(!vid.consider_shader_projection) {
shader_flags |= SF_PIXELS;
}
else if(pmodel == mdDisk && MDIM == 3 && !spherespecial && !prod) {
shader_flags |= SF_DIRECT;
}
else if(glhr::noshaders) {
shader_flags |= SF_PIXELS;
}
else if(pmodel == mdDisk && GDIM == 3 && !spherespecial && !nonisotropic && !prod) {
coordinator += "t /= (t[3] + uAlpha);\n";
vsh += "uniform mediump float uAlpha;";
shader_flags |= SF_DIRECT | SF_BOX | SF_ZFOG;
treset = true;
}
else if(pmodel == mdBand && hyperbolic) {
shader_flags |= SF_BAND | SF_ORIENT | SF_BOX | SF_DIRECT;
coordinator += "t = uPP * t;", vsh += "uniform mediump mat4 uPP;";
if(dim2) coordinator += "mediump float zlev = zlevel(t); t /= zlev;\n";
if(dim3) coordinator += "mediump float r = sqrt(t.y*t.y+t.z*t.z); float ty = asinh(r);\n";
if(dim2) coordinator += "mediump float ty = asinh(t.y);\n";
coordinator += "mediump float tx = asinh(t.x / cosh(ty)); ty = 2.0 * atan(tanh(ty/2.0));\n";
if(dim2) coordinator += "t[0] = tx; t[1] = ty; t[2] = 1.0; t[3] = 1.0;\n";
if(dim3) coordinator += "t[0] = tx; t[1] = ty*t.y/r; t[2] = ty*t.z/r; t[3] = 1.0;\n";
if(dim3) shader_flags |= SF_ZFOG;
}
else if(pmodel == mdHalfplane && hyperbolic) {
shader_flags |= SF_HALFPLANE | SF_ORIENT | SF_BOX | SF_DIRECT;
if(dim2) shader_flags |= SF_USE_ALPHA;
coordinator += "t = uPP * t;", vsh += "uniform mediump mat4 uPP;";
if(dim2) coordinator +=
"mediump float zlev = zlevel(t); t /= zlev;\n"
"t.xy /= t.z; t.y += 1.0;\n"
"mediump float rads = dot(t.xy, t.xy);\n"
"t.xy /= -rads; t.z = 1.0; t[3] = 1.0;\n";
if(dim3) coordinator +=
"t.xyz /= (t.w + 1.0); t.y += 1.0;\n"
"mediump float rads = dot(t.xyz, t.xyz);\n"
"t.xyz /= -rads; t[3] = 1.0;\n";
if(dim3) shader_flags |= SF_ZFOG;
}
else if(pmodel == mdGeodesic) {
shader_flags |= SF_PERS3 | SF_DIRECT;
coordinator += "t = inverse_exp(t);\n";
if(sn::in()) {
coordinator +=
"mediump float d = dot(t.xyz, t.xyz);\n"
"mediump float hz = (1.+d) / (1.-d);\n"
"mediump float ad = acosh(hz);\n"
"mediump float m = d == 0. ? 0. : d >= 1. ? 1.e4 : (hz+1.) * ad / sinh(ad);\n"
"t.xyz *= m;\n";
distfun = "ad";
}
else
distfun = "length(t.xyz)";
switch(cgclass) {
#if CAP_SOLV
case gcSolNIH:
switch(sn::geom()) {
case gSol:
if(solv_all) {
vsh += "\n#define SOLV_ALL\n";
}
vsh += sn::shader_symsol;
break;
case gNIH:
vsh += sn::shader_nsym;
break;
case gSolN:
vsh += sn::shader_nsymsol;
break;
default:
println(hlog, "error: unknown sn geometry");
}
treset = true;
break;
#endif
case gcNil:
vsh += nilv::nilshader;
break;
case gcSL2:
vsh += slr::slshader;
break;
default:
println(hlog, "error: unknown geometry in geodesic");
break;
}
}
else if(in_h2xe() && pmodel == mdPerspective) {
shader_flags |= SF_PERS3 | SF_DIRECT;
coordinator +=
"mediump float z = log(t[2] * t[2] - t[0] * t[0] - t[1] * t[1]) / 2.;\n"
"mediump float r = length(t.xy);\n"
"mediump float t2 = t[2] / exp(z);\n"
"mediump float d = t2 >= 1. ? acosh(t2) : 0.;\n"
"if(r != 0.) r = d / r;\n"
"t.xy *= r; t.z = z;\n";
distfun = "sqrt(z*z+d*d)";
treset = true;
}
else if(in_e2xe() && pmodel == mdPerspective) {
shader_flags |= SF_PERS3 | SF_DIRECT;
coordinator +=
"t.xy /= t.z;\n"
"t.z = log(t.z);\n";
distfun = "length(t.xyz)";
treset = true;
}
else if(in_s2xe() && pmodel == mdPerspective) {
shader_flags |= SF_PERS3 | SF_DIRECT;
distfun = "length(t.xyz)", treset = true;
}
else if(pmodel == mdPerspective) {
shader_flags |= SF_PERS3 | SF_DIRECT;
if(hyperbolic)
distfun = "acosh(t[3])", treset = true;
else if(euclid || nonisotropic)
distfun = "length(t.xyz)", treset = true;
else {
if(spherephase & 4) coordinator += "t = -t;\n";
switch(spherephase & 3) {
case 0: distfun = "(2. * PI - acos(-t[3]))"; coordinator += "t = -t;\n"; break;
case 1: distfun = "(2. * PI - acos(t[3]))"; coordinator += "t.xyz = -t.xyz;\n"; break;
case 2: distfun = "acos(-t[3])"; coordinator += "t.w = -t.w;\n"; break;
case 3: distfun = "acos(t[3])"; break;
}
}
}
else {
shader_flags |= SF_PIXELS;
if(dim3) shader_flags |= SF_ZFOG;
}
if(!skip_t) {
vmain += "mediump vec4 t = uMV * aPosition;\n";
vmain += coordinator;
if(distfun != "") {
vmain += "mediump float fogs = (uFogBase - " + distfun + " / uFog);\n";
vmain += "vColor.xyz = vColor.xyz * fogs + uFogColor.xyz * (1.0-fogs);\n";
vsh +=
"uniform mediump float uFog;\n"
"uniform mediump float uFogBase;\n"
"uniform mediump vec4 uFogColor;\n";
}
if(shader_flags & GF_LEVELS) vmain += "vPos = t;\n";
if(treset) vmain += "t[3] = 1.0;\n";
vmain += "gl_Position = uP * t;\n";
}
vsh +=
"uniform mediump mat4 uMV;\n"
"uniform mediump mat4 uP;\n";
if(shader_flags & SF_ZFOG) {
vmain +=
"mediump float pz = 0.5 + gl_Position.z / 2.0;\n"
"vColor.xyz = vColor.xyz * (1.-pz) + uFogColor.xyz * pz;\n";
vsh +=
"uniform mediump vec4 uFogColor;\n";
}
vmain += "}";
fmain += "}";
fsh += varying;
fsh += fmain;
vsh += varying;
vsh += vmain;
if(glhr::noshaders || !vid.usingGL) fsh = vsh = "";
string both = fsh + "*" + vsh + "*" + llts(shader_flags);
if(compiled_programs.count(both))
return compiled_programs[both];
else {
auto res = make_shared<glhr::GLprogram>(vsh, fsh);
res->shader_flags = shader_flags;
return res;
}
}
void display_data::set_projection(int ed) {
flagtype shader_flags = current_display->next_shader_flags;
unsigned id;
id = geometry;
id <<= 6; id |= pmodel;
if(levellines && pmodel != mdPixel) {
shader_flags |= GF_LEVELS;
if(disable_texture) shader_flags &=~ GF_TEXTURE;
}
id <<= 6; id |= shader_flags;
id <<= 6; id |= spherephase;
id <<= 1; if(vid.consider_shader_projection) id |= 1;
id <<= 2; id |= (spherespecial & 3);
if(sol && solv_all) id |= 1;
if(in_h2xe()) id |= 1;
if(in_s2xe()) id |= 2;
shared_ptr<glhr::GLprogram> selected;
if(matched_programs.count(id)) selected = matched_programs[id];
else {
selected = write_shader(shader_flags);
matched_programs[id] = selected;
}
if(glhr::current_glprogram != selected) full_enable(selected);
shader_flags = selected->shader_flags;
auto cd = current_display;
#if CAP_SOLV
if(selected->uPRECX != -1) {
auto &tab = sn::get_tabled();
GLuint invexpid = tab.get_texture_id();
glActiveTexture(GL_TEXTURE0 + INVERSE_EXP_BINDING);
glBindTexture(GL_TEXTURE_3D, invexpid);
glActiveTexture(GL_TEXTURE0 + 0);
glhr::set_solv_prec(tab.PRECX, tab.PRECY, tab.PRECZ);
}
#endif
if(selected->uIterations != -1) {
glhr::set_index_sl(0);
glhr::set_sl_iterations(slr::steps);
}
glhr::new_projection();
if(ed && vid.stereo_mode == sLR) {
glhr::projection_multiply(glhr::translate(ed, 0, 0));
glhr::projection_multiply(glhr::scale(2, 1, 1));
}
ld tx = (cd->xcenter-cd->xtop)*2./cd->xsize - 1;
ld ty = (cd->ycenter-cd->ytop)*2./cd->ysize - 1;
glhr::projection_multiply(glhr::translate(tx, -ty, 0));
if(pmodel == mdManual) return;
if(pconf.stretch != 1 && (shader_flags & SF_DIRECT) && pmodel != mdPixel) glhr::projection_multiply(glhr::scale(1, pconf.stretch, 1));
if(vid.stereo_mode != sODS)
eyewidth_translate(ed);
auto ortho = [&] (ld x, ld y) {
glhr::glmatrix M = glhr::ortho(x, y, 1);
if(shader_flags & SF_ZFOG) {
M[2][2] = 2 / (pconf.clip_max - pconf.clip_min);
M[3][2] = (pconf.clip_min + pconf.clip_max) / (pconf.clip_max - pconf.clip_min);
auto cols = glhr::acolor(darkena(backcolor, 0, 0xFF));
glUniform4f(selected->uFogColor, cols[0], cols[1], cols[2], cols[3]);
}
else M[2][2] /= 1000;
glhr::projection_multiply(M);
if(nisot::local_perspective_used() && (shader_flags & SF_BOX))
glhr::projection_multiply(glhr::tmtogl_transpose(NLP));
if(ed && vid.stereo_mode != sODS) {
glhr::glmatrix m = glhr::id;
m[2][0] -= ed;
glhr::projection_multiply(m);
}
glhr::id_modelview();
};
if(shader_flags & SF_PIXELS) ortho(cd->xsize/2, -cd->ysize/2);
else if(shader_flags & SF_BOX) ortho(cd->xsize/current_display->radius/2, -cd->ysize/current_display->radius/2);
else if(shader_flags & SF_ODSBOX) {
ortho(M_PI, M_PI);
glhr::fog_max(1/sightranges[geometry], darkena(backcolor, 0, 0xFF));
}
else if(shader_flags & SF_PERS3) {
glhr::projection_multiply(glhr::frustum(current_display->tanfov, current_display->tanfov * cd->ysize / cd->xsize));
glhr::projection_multiply(glhr::scale(1, -1, -1));
if(nisot::local_perspective_used()) {
if(prod) {
for(int i=0; i<3; i++) NLP[3][i] = NLP[i][3] = 0;
NLP[3][3] = 1;
}
glhr::projection_multiply(glhr::tmtogl_transpose(NLP));
}
if(ed) {
glhr::using_eyeshift = true;
glhr::eyeshift = glhr::tmtogl(xpush(vid.ipd * ed/2));
}
glhr::fog_max(1/sightranges[geometry], darkena(backcolor, 0, 0xFF));
}
else {
if(pconf.alpha > -1) {
// Because of the transformation from H3 to the Minkowski hyperboloid,
// points with negative Z can be generated in some 3D settings.
// This happens for points below the camera, but above the plane.
// These points should still be viewed, though, so we disable the
// depth clipping
glhr::projection_multiply(glhr::scale(1,1,0));
}
GLfloat sc = current_display->radius / (cd->ysize/2.);
glhr::projection_multiply(glhr::frustum(cd->xsize / cd->ysize, 1));
glhr::projection_multiply(glhr::scale(sc, -sc, -1));
glhr::projection_multiply(glhr::translate(0, 0, pconf.alpha));
if(ed) glhr::projection_multiply(glhr::translate(vid.ipd * ed/2, 0, 0));
}
if(selected->uPP != -1) {
glhr::glmatrix pp = glhr::id;
if(get_shader_flags() & SF_USE_ALPHA)
pp[3][2] = GLfloat(pconf.alpha);
if(get_shader_flags() & SF_ORIENT) {
if(GDIM == 3) for(int a=0; a<4; a++)
models::apply_orientation_yz(pp[a][1], pp[a][2]);
for(int a=0; a<4; a++)
models::apply_orientation(pp[a][0], pp[a][1]);
}
glUniformMatrix4fv(selected->uPP, 1, 0, pp.as_array());
}
if(selected->uAlpha != -1)
glhr::set_ualpha(pconf.alpha);
if(selected->uLevelLines != -1) {
glUniform1f(selected->uLevelLines, levellines);
}
if(selected->shader_flags & SF_ORIENT)
glhr::projection_multiply(model_orientation_gl());
if(selected->shader_flags & SF_BAND)
glhr::projection_multiply(glhr::scale(2 / M_PI, 2 / M_PI, GDIM == 3 ? 2/M_PI : 1));
if(selected->shader_flags & SF_BAND)
glhr::projection_multiply(glhr::translate(band_shift, 0, 0));
if(selected->shader_flags & SF_HALFPLANE) {
glhr::projection_multiply(glhr::translate(0, 1, 0));
glhr::projection_multiply(glhr::scale(-1, 1, 1));
glhr::projection_multiply(glhr::scale(pconf.halfplane_scale, pconf.halfplane_scale, GDIM == 3 ? pconf.halfplane_scale : 1));
glhr::projection_multiply(glhr::translate(0, 0.5, 0));
}
if(pconf.camera_angle && pmodel != mdPixel) {
ld cam = pconf.camera_angle * degree;
GLfloat cc = cos(cam);
GLfloat ss = sin(cam);
GLfloat yzspin[16] = {
1, 0, 0, 0,
0, cc, ss, 0,
0, -ss, cc, 0,
0, 0, 0, 1
};
glhr::projection_multiply(glhr::as_glmatrix(yzspin));
}
}
EX void add_if(string& shader, const string& seek, const string& function) {
if(shader.find(seek) != string::npos)
shader = function + shader;
}
EX void add_fixed_functions(string& shader) {
/* from the most complex to the simplest */
add_if(shader, "tanh", "mediump float tanh(mediump float x) { return sinh(x) / cosh(x); }\n");
add_if(shader, "sinh", "mediump float sinh(mediump float x) { return (exp(x) - exp(-x)) / 2.0; }\n");
add_if(shader, "cosh", "mediump float cosh(mediump float x) { return (exp(x) + exp(-x)) / 2.0; }\n");
add_if(shader, "asinh", "mediump float asinh(mediump float x) { return log(sqrt(x*x + 1.0) + x); }\n");
add_if(shader, "acosh", "mediump float acosh(mediump float x) { return log(sqrt(x*x - 1.0) + x); }\n");
add_if(shader, "atanh", "mediump float atanh(mediump float x) { return (log(1.+x)-log(1.-x))/2.; }\n");
add_if(shader, "zlevel", "mediump float zlevel(mediump vec4 h) { return (h[2] < 0.0 ? -1.0 : 1.0) * sqrt(h[2]*h[2] - h[0]*h[0] - h[1]*h[1]); }\n");
add_if(shader, "atan2", "mediump float atan2(mediump float y, mediump float x) {\n"
"if(x == 0.) return y > 0. ? PI/2. : -PI/2.;\n"
"if(x > 0.) return atan(y / x);\n"
"if(y >= 0.) return atan(y / x) + PI;\n"
"if(y < 0.) return atan(y / x) - PI;\n"
"}\n");
add_if(shader, "PI", "#define PI 3.14159265358979324\n");
#ifndef GLES_ONLY
add_if(shader, "mediump", "#define mediump\n");
#endif
}
EX flagtype get_shader_flags() {
if(!glhr::current_glprogram) return 0;
return glhr::current_glprogram->shader_flags;
}
EX void glapplymatrix(const transmatrix& V) {
GLfloat mat[16];
int id = 0;
if(MDIM == 3) {
for(int y=0; y<3; y++) {
for(int x=0; x<3; x++) mat[id++] = V[x][y];
mat[id++] = 0;
}
mat[12] = 0;
mat[13] = 0;
mat[14] = 0;
mat[15] = 1;
}
else {
for(int y=0; y<4; y++)
for(int x=0; x<4; x++) mat[id++] = V[x][y];
}
glhr::set_modelview(glhr::as_glmatrix(mat));
}
#endif
}
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