mirror of
https://github.com/zenorogue/hyperrogue.git
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520 lines
17 KiB
C++
520 lines
17 KiB
C++
// Hyperbolic Rogue -- shaders
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// Copyright (C) 2011-2019 Zeno Rogue, see 'hyper.cpp' for details
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/** \file shaders.cpp
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* \brief shaders
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*/
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#include "hyper.h"
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namespace hr {
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EX ld levellines;
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EX bool disable_texture;
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#if HDR
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constexpr flagtype GF_TEXTURE = 1;
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constexpr flagtype GF_VARCOLOR = 2;
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constexpr flagtype GF_LIGHTFOG = 4;
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constexpr flagtype GF_LEVELS = 8;
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constexpr flagtype GF_which = 15;
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constexpr flagtype SF_PERS3 = 256;
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constexpr flagtype SF_BAND = 512;
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constexpr flagtype SF_USE_ALPHA = 1024;
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constexpr flagtype SF_DIRECT = 2048;
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constexpr flagtype SF_PIXELS = 4096;
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constexpr flagtype SF_HALFPLANE = 8192;
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constexpr flagtype SF_ORIENT = 16384;
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constexpr flagtype SF_BOX = 32768;
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constexpr flagtype SF_ZFOG = 65536;
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#endif
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#if HDR
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/* standard attribute bindings */
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/* taken from: https://www.opengl.org/sdk/docs/tutorials/ClockworkCoders/attributes.php */
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constexpr int aPosition = 0;
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constexpr int aColor = 3;
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constexpr int aTexture = 8;
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/* texture bindings */
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constexpr int INVERSE_EXP_BINDING = 2;
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#endif
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EX map<string, shared_ptr<glhr::GLprogram>> compiled_programs;
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EX map<unsigned, shared_ptr<glhr::GLprogram>> matched_programs;
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glhr::glmatrix model_orientation_gl() {
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glhr::glmatrix s = glhr::id;
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for(int a=0; a<GDIM; a++)
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models::apply_orientation(s[a][1], s[a][0]);
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if(GDIM == 3) for(int a=0; a<GDIM; a++)
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models::apply_orientation_yz(s[a][2], s[a][1]);
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return s;
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}
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shared_ptr<glhr::GLprogram> write_shader(flagtype shader_flags) {
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string varying, vsh, fsh, vmain = "void main() {\n", fmain = "void main() {\n";
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vsh += "attribute mediump vec4 aPosition;\n";
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varying += "varying mediump vec4 vColor;\n";
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fmain += "gl_FragColor = vColor;\n";
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if(shader_flags & GF_TEXTURE) {
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vsh += "attribute mediump vec2 aTexture;\n";
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varying += "varying mediump vec2 vTexCoord;\n";
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fsh += "uniform mediump sampler2D tTexture;\n";
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vmain += "vTexCoord = aTexture;\n",
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fmain += "gl_FragColor *= texture2D(tTexture, vTexCoord);\n";
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}
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if(shader_flags & GF_LEVELS) {
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fsh += "uniform mediump float uLevelLines;\n";
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varying += "varying mediump vec4 vPos;\n";
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fmain += "gl_FragColor.rgb *= 0.5 + 0.5 * cos(vPos.z/vPos.w * uLevelLines * 2. * PI);\n";
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}
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if(shader_flags & GF_VARCOLOR) {
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vsh += "attribute mediump vec4 aColor;\n";
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vmain += "vColor = aColor;\n";
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}
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else {
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vmain += "vColor = uColor;\n";
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vsh += "uniform mediump vec4 uColor;\n";
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}
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if(shader_flags & GF_LIGHTFOG) {
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vmain += "float fogx = clamp(1.0 + aPosition.z * uFog, 0.0, 1.0); vColor = vColor * fogx + uFogColor * (1.0-fogx);\n";
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vsh += "uniform mediump float uFog;\n";
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vsh += "uniform mediump vec4 uFogColor;\n";
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}
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string coordinator;
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string distfun;
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bool treset = false;
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bool dim2 = GDIM == 2;
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bool dim3 = GDIM == 3;
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bool skip_t = false;
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if(pmodel == mdPixel) {
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vmain += "vec4 pos = aPosition; pos[3] = 1.0;\n";
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vmain += "pos = uMV * pos;\n";
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if(shader_flags & GF_LEVELS) vmain += "vPos = pos;\n";
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vmain += "gl_Position = uP * pos;\n";
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skip_t = true;
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shader_flags |= SF_PIXELS | SF_DIRECT;
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}
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else if(pmodel == mdManual) {
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vmain += "vec4 pos = uMV * aPosition;\n";
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if(shader_flags & GF_LEVELS)
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vmain += "vPos = pos;\n";
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vmain += "gl_Position = uP * pos;\n";
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skip_t = true;
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shader_flags |= SF_DIRECT;
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}
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else if(!vid.consider_shader_projection) {
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shader_flags |= SF_PIXELS;
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}
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else if(pmodel == mdDisk && MDIM == 3 && !spherespecial && !prod) {
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shader_flags |= SF_DIRECT;
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}
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else if(glhr::noshaders) {
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shader_flags |= SF_PIXELS;
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}
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else if(pmodel == mdDisk && GDIM == 3 && !spherespecial && !nonisotropic && !prod) {
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coordinator += "t /= (t[3] + uAlpha);\n";
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vsh += "uniform mediump float uAlpha;";
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shader_flags |= SF_DIRECT | SF_BOX | SF_ZFOG;
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treset = true;
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}
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else if(pmodel == mdBand && hyperbolic) {
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shader_flags |= SF_BAND | SF_ORIENT | SF_BOX | SF_DIRECT;
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coordinator += "t = uPP * t;", vsh += "uniform mediump mat4 uPP;";
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if(dim2) coordinator += "float zlev = zlevel(t); t /= zlev;\n";
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if(dim3) coordinator += "float r = sqrt(t.y*t.y+t.z*t.z); float ty = asinh(r);\n";
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if(dim2) coordinator += "float ty = asinh(t.y);\n";
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coordinator += "float tx = asinh(t.x / cosh(ty)); ty = 2.0 * atan(tanh(ty/2.0));\n";
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if(dim2) coordinator += "t[0] = tx; t[1] = ty; t[2] = 1.0; t[3] = 1.0;\n";
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if(dim3) coordinator += "t[0] = tx; t[1] = ty*t.y/r; t[2] = ty*t.z/r; t[3] = 1.0;\n";
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if(dim3) shader_flags |= SF_ZFOG;
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}
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else if(pmodel == mdHalfplane && hyperbolic) {
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shader_flags |= SF_HALFPLANE | SF_ORIENT | SF_BOX | SF_DIRECT;
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if(dim2) shader_flags |= SF_USE_ALPHA;
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coordinator += "t = uPP * t;", vsh += "uniform mediump mat4 uPP;";
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if(dim2) coordinator +=
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"float zlev = zlevel(t); t /= zlev;\n"
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"t.xy /= t.z; t.y += 1.0;\n"
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"float rads = dot(t.xy, t.xy);\n"
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"t.xy /= -rads; t.z = 1.0; t[3] = 1.0;\n";
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if(dim3) coordinator +=
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"t.xyz /= (t.w + 1.0); t.y += 1.0;\n"
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"float rads = dot(t.xyz, t.xyz);\n"
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"t.xyz /= -rads; t[3] = 1.0;\n";
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if(dim3) shader_flags |= SF_ZFOG;
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}
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else if(pmodel == mdGeodesic) {
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shader_flags |= SF_PERS3 | SF_DIRECT;
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coordinator += "t = inverse_exp(t);\n";
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if(solnih) {
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coordinator +=
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"float d = sqrt(t[0] * t[0] + t[1] * t[1] + t[2] * t[2]);\n"
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"float ad = (d == 0.) ? 0. : (d < 1.) ? min(atanh(d), 10.) : 10.;\n"
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"float m = ad / d; t[0] *= m; t[1] *= m; t[2] *= m;\n";
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distfun = "ad";
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}
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else
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distfun = "length(t.xyz)";
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switch(cgclass) {
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#if CAP_SOLV
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case gcSolNIH:
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switch(solnihv::geom()) {
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case gSol:
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vsh += solnihv::shader_symsol;
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break;
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case gNIH:
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vsh += solnihv::shader_nsym;
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break;
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case gSolN:
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vsh += solnihv::shader_nsymsol;
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break;
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default:
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println(hlog, "error: unknown solnih geometry");
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}
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treset = true;
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break;
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#endif
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case gcNil:
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vsh += nilv::nilshader;
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break;
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case gcSL2:
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vsh += slr::slshader;
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break;
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default:
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println(hlog, "error: unknown geometry in geodesic");
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break;
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}
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}
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else if(in_h2xe() && pmodel == mdPerspective) {
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shader_flags |= SF_PERS3 | SF_DIRECT;
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coordinator +=
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"float z = log(t[2] * t[2] - t[0] * t[0] - t[1] * t[1]) / 2.;\n"
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"float r = length(t.xy);\n"
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"float t2 = t[2] / exp(z);\n"
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"float d = t2 >= 1. ? acosh(t2) : 0.;\n"
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"if(r != 0.) r = d / r;\n"
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"t.xy *= r; t.z = z;\n";
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distfun = "sqrt(z*z+d*d)";
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treset = true;
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}
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else if(in_e2xe() && pmodel == mdPerspective) {
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shader_flags |= SF_PERS3 | SF_DIRECT;
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coordinator +=
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"t.xy /= t.z;\n"
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"t.z = log(t.z);\n";
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distfun = "length(t.xyz)";
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treset = true;
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}
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else if(in_s2xe() && pmodel == mdPerspective) {
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shader_flags |= SF_PERS3 | SF_DIRECT;
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distfun = "length(t.xyz)", treset = true;
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}
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else if(pmodel == mdPerspective) {
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shader_flags |= SF_PERS3 | SF_DIRECT;
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if(hyperbolic)
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distfun = "acosh(t[3])", treset = true;
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else if(euclid || nonisotropic)
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distfun = "length(t.xyz)", treset = true;
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else {
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if(spherephase & 4) coordinator += "t = -t;\n";
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switch(spherephase & 3) {
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case 0: distfun = "(2. * PI - acos(-t[3]))"; coordinator += "t = -t;\n"; break;
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case 1: distfun = "(2. * PI - acos(t[3]))"; coordinator += "t.xyz = -t.xyz;\n"; break;
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case 2: distfun = "acos(-t[3])"; coordinator += "t.w = -t.w;\n"; break;
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case 3: distfun = "acos(t[3])"; break;
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}
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}
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}
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else {
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shader_flags |= SF_PIXELS;
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if(dim3) shader_flags |= SF_ZFOG;
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}
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if(!skip_t) {
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vmain += "vec4 t = uMV * aPosition;\n";
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vmain += coordinator;
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if(distfun != "") {
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vmain += "float fogs = (uFogBase - " + distfun + " / uFog);\n";
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vmain += "vColor.xyz = vColor.xyz * fogs + uFogColor.xyz * (1.0-fogs);\n";
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vsh +=
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"uniform mediump float uFog;\n"
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"uniform mediump float uFogBase;\n"
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"uniform mediump vec4 uFogColor;\n";
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}
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if(shader_flags & GF_LEVELS) vmain += "vPos = t;\n";
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if(treset) vmain += "t[3] = 1.0;\n";
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vmain += "gl_Position = uP * t;\n";
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}
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vsh +=
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"uniform mediump mat4 uMV;\n"
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"uniform mediump mat4 uP;\n";
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if(shader_flags & SF_ZFOG) {
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vmain +=
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"float pz = 0.5 + gl_Position.z / 2.0;\n"
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"vColor.xyz = vColor.xyz * (1.-pz) + uFogColor.xyz * pz;\n";
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vsh +=
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"uniform mediump vec4 uFogColor;\n";
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}
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vmain += "}";
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fmain += "}";
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fsh += varying;
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fsh += fmain;
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vsh += varying;
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vsh += vmain;
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if(glhr::noshaders) fsh = vsh = "";
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string both = fsh + "*" + vsh + "*" + its(shader_flags);
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if(compiled_programs.count(both))
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return compiled_programs[both];
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else {
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auto res = make_shared<glhr::GLprogram>(vsh, fsh);
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res->shader_flags = shader_flags;
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return res;
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}
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}
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void display_data::set_projection(int ed) {
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flagtype shader_flags = current_display->next_shader_flags;
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unsigned id;
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id = geometry;
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id <<= 6; id |= pmodel;
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if(levellines && pmodel != mdPixel) {
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shader_flags |= GF_LEVELS;
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if(disable_texture) shader_flags &=~ GF_TEXTURE;
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}
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id <<= 6; id |= shader_flags;
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id <<= 6; id |= spherephase;
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id <<= 1; if(vid.consider_shader_projection) id |= 1;
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id <<= 2; id |= (spherespecial & 3);
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shared_ptr<glhr::GLprogram> selected;
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if(matched_programs.count(id)) selected = matched_programs[id];
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else {
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selected = write_shader(shader_flags);
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matched_programs[id] = selected;
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}
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if(glhr::current_glprogram != selected) full_enable(selected);
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shader_flags = selected->shader_flags;
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auto cd = current_display;
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#if CAP_SOLV
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if(selected->uPRECX != -1) {
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auto &tab = solnihv::get_tabled();
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GLuint invexpid = tab.get_texture_id();
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glActiveTexture(GL_TEXTURE0 + INVERSE_EXP_BINDING);
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glBindTexture(GL_TEXTURE_3D, invexpid);
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glActiveTexture(GL_TEXTURE0 + 0);
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glhr::set_solv_prec(tab.PRECX, tab.PRECY, tab.PRECZ);
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}
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#endif
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if(selected->uIterations != -1) {
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glhr::set_index_sl(0);
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glhr::set_sl_iterations(slr::steps);
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}
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glhr::new_projection();
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if(ed && vid.stereo_mode == sLR) {
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glhr::projection_multiply(glhr::translate(ed, 0, 0));
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glhr::projection_multiply(glhr::scale(2, 1, 1));
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}
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ld tx = (cd->xcenter-cd->xtop)*2./cd->xsize - 1;
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ld ty = (cd->ycenter-cd->ytop)*2./cd->ysize - 1;
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glhr::projection_multiply(glhr::translate(tx, -ty, 0));
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if(pmodel == mdManual) return;
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if(vid.stretch != 1 && (shader_flags & SF_DIRECT)) glhr::projection_multiply(glhr::scale(vid.stretch, 1, 1));
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eyewidth_translate(ed);
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auto ortho = [&] (ld x, ld y) {
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glhr::glmatrix M = glhr::ortho(x, y, 1);
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if(shader_flags & SF_ZFOG) {
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using models::clip_max;
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using models::clip_min;
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M[2][2] = 2 / (clip_max - clip_min);
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M[3][2] = (clip_min + clip_max) / (clip_max - clip_min);
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auto cols = glhr::acolor(darkena(backcolor, 0, 0xFF));
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glUniform4f(selected->uFogColor, cols[0], cols[1], cols[2], cols[3]);
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}
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else M[2][2] /= 1000;
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glhr::projection_multiply(M);
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if(nisot::local_perspective_used() && (shader_flags & SF_BOX))
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glhr::projection_multiply(glhr::tmtogl_transpose(NLP));
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if(ed) {
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glhr::glmatrix m = glhr::id;
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m[2][0] -= ed;
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glhr::projection_multiply(m);
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}
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glhr::id_modelview();
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};
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if(shader_flags & SF_PIXELS) ortho(cd->xsize/2, -cd->ysize/2);
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else if(shader_flags & SF_BOX) ortho(cd->xsize/current_display->radius/2, -cd->ysize/current_display->radius/2);
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else if(shader_flags & SF_PERS3) {
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glhr::projection_multiply(glhr::frustum(current_display->tanfov, current_display->tanfov * cd->ysize / cd->xsize));
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glhr::projection_multiply(glhr::scale(1, -1, -1));
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if(nisot::local_perspective_used()) {
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if(prod) {
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for(int i=0; i<3; i++) NLP[3][i] = NLP[i][3] = 0;
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NLP[3][3] = 1;
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}
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glhr::projection_multiply(glhr::tmtogl_transpose(NLP));
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}
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if(ed) {
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glhr::using_eyeshift = true;
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glhr::eyeshift = glhr::tmtogl(xpush(vid.ipd * ed/2));
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}
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glhr::fog_max(1/sightranges[geometry], darkena(backcolor, 0, 0xFF));
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}
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else {
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if(vid.alpha > -1) {
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// Because of the transformation from H3 to the Minkowski hyperboloid,
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// points with negative Z can be generated in some 3D settings.
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// This happens for points below the camera, but above the plane.
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// These points should still be viewed, though, so we disable the
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// depth clipping
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glhr::projection_multiply(glhr::scale(1,1,0));
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}
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GLfloat sc = current_display->radius / (cd->ysize/2.);
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glhr::projection_multiply(glhr::frustum(cd->xsize / cd->ysize, 1));
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glhr::projection_multiply(glhr::scale(sc, -sc, -1));
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glhr::projection_multiply(glhr::translate(0, 0, vid.alpha));
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if(ed) glhr::projection_multiply(glhr::translate(vid.ipd * ed/2, 0, 0));
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}
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if(selected->uPP != -1) {
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glhr::glmatrix pp = glhr::id;
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if(get_shader_flags() & SF_USE_ALPHA)
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pp[3][2] = GLfloat(vid.alpha);
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if(get_shader_flags() & SF_ORIENT) {
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if(GDIM == 3) for(int a=0; a<4; a++)
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models::apply_orientation_yz(pp[a][1], pp[a][2]);
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for(int a=0; a<4; a++)
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models::apply_orientation(pp[a][0], pp[a][1]);
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}
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glUniformMatrix4fv(selected->uPP, 1, 0, pp.as_array());
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}
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if(selected->uAlpha != -1)
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glhr::set_ualpha(vid.alpha);
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if(selected->uLevelLines != -1) {
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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_HALFPLANE) {
|
|
glhr::projection_multiply(glhr::translate(0, 1, 0));
|
|
glhr::projection_multiply(glhr::scale(-1, 1, 1));
|
|
glhr::projection_multiply(glhr::scale(models::halfplane_scale, models::halfplane_scale, GDIM == 3 ? models::halfplane_scale : 1));
|
|
glhr::projection_multiply(glhr::translate(0, 0.5, 0));
|
|
}
|
|
|
|
if(vid.camera_angle && pmodel != mdPixel) {
|
|
ld cam = vid.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", "float tanh(float x) { return sinh(x) / cosh(x); }\n");
|
|
add_if(shader, "sinh", "float sinh(float x) { return (exp(x) - exp(-x)) / 2.0; }\n");
|
|
add_if(shader, "cosh", "float cosh(float x) { return (exp(x) + exp(-x)) / 2.0; }\n");
|
|
add_if(shader, "asinh", "float asinh(float x) { return log(sqrt(x*x + 1.0) + x); }\n");
|
|
add_if(shader, "acosh", "float acosh(float x) { return log(sqrt(x*x - 1.0) + x); }\n");
|
|
add_if(shader, "atanh", "float atanh(float x) { return (log(1.+x)-log(1.-x))/2.; }\n");
|
|
add_if(shader, "zlevel", "float zlevel(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", "float atan2(float y, 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));
|
|
}
|
|
|
|
|
|
}
|