src/engine/rendersky.cpp

   1 #include "pch.h"
   2 #include "engine.h"
   3
   4 Texture *sky[6] = { 0, 0, 0, 0, 0, 0 };
   5 float spinsky = 0;
   6
   7 void loadsky(char *basename, float *spin)
   8 {
   9     spinsky = *spin;
  10
  11     static string lastsky = "";
  12     if(strcmp(lastsky, basename)==0) return;
  13     static const char *side[] = { "ft", "bk", "lf", "rt", "dn", "up" };
  14     loopi(6)
  15     {
  16         s_sprintfd(name)("packages/%s_%s.jpg", basename, side[i]);
  17         if((sky[i] = textureload(name, 3, true, false))==notexture)
  18         {
  19             strcpy(name+strlen(name)-3, "png");
  20             if((sky[i] = textureload(name, 3, true, false))==notexture) conoutf("could not load sky texture packages/%s_%s", basename, side[i]);
  21         }
  22     }
  23     s_strcpy(lastsky, basename);
  24 }
  25
  26 COMMAND(loadsky, "sf");
  27
  28 void draw_envbox_face(float s0, float t0, int x0, int y0, int z0,
  29                       float s1, float t1, int x1, int y1, int z1,
  30                       float s2, float t2, int x2, int y2, int z2,
  31                       float s3, float t3, int x3, int y3, int z3,
  32                       GLuint texture)
  33 {
  34     glBindTexture(GL_TEXTURE_2D, texture);
  35     glBegin(GL_QUADS);
  36     glTexCoord2f(s3, t3); glVertex3i(x3, y3, z3);
  37     glTexCoord2f(s2, t2); glVertex3i(x2, y2, z2);
  38     glTexCoord2f(s1, t1); glVertex3i(x1, y1, z1);
  39     glTexCoord2f(s0, t0); glVertex3i(x0, y0, z0);
  40     glEnd();
  41     xtraverts += 4;
  42 }
  43
  44 void draw_envbox(int w, float zclip = 0.0f)
  45 {
  46     if(!sky[0]) fatal("no skybox");
  47
  48     float vclip = 1-zclip;
  49     int z = int(ceil(2*w*(vclip-0.5f)));
  50
  51     glDepthMask(GL_FALSE);
  52
  53     draw_envbox_face(1.0f, vclip, -w, -w,  z,
  54                      0.0f, vclip,  w, -w,  z,
  55                      0.0f, 0.0f,  w, -w, -w,
  56                      1.0f, 0.0f, -w, -w, -w, sky[0]->gl);
  57
  58     draw_envbox_face(1.0f, vclip, +w,  w,  z,
  59                      0.0f, vclip, -w,  w,  z,
  60                      0.0f, 0.0f, -w,  w, -w,
  61                      1.0f, 0.0f, +w,  w, -w, sky[1]->gl);
  62
  63     draw_envbox_face(0.0f, 0.0f, -w, -w, -w,
  64                      1.0f, 0.0f, -w,  w, -w,
  65                      1.0f, vclip, -w,  w,  z,
  66                      0.0f, vclip, -w, -w,  z, sky[2]->gl);
  67
  68     draw_envbox_face(1.0f, vclip, +w, -w,  z,
  69                      0.0f, vclip, +w,  w,  z,
  70                      0.0f, 0.0f, +w,  w, -w,
  71                      1.0f, 0.0f, +w, -w, -w, sky[3]->gl);
  72
  73     if(!zclip)
  74         draw_envbox_face(0.0f, 1.0f, -w,  w,  w,
  75                          0.0f, 0.0f, +w,  w,  w,
  76                          1.0f, 0.0f, +w, -w,  w,
  77                          1.0f, 1.0f, -w, -w,  w, sky[4]->gl);
  78
  79     draw_envbox_face(0.0f, 1.0f, +w,  w, -w,
  80                      0.0f, 0.0f, -w,  w, -w,
  81                      1.0f, 0.0f, -w, -w, -w,
  82                      1.0f, 1.0f, +w, -w, -w, sky[5]->gl);
  83
  84     glDepthMask(GL_TRUE);
  85 }
  86
  87 VARP(sparklyfix, 0, 1, 1);
  88 VAR(showsky, 0, 1, 1);
  89
  90 bool drawskylimits(bool explicitonly, float zreflect)
  91 {
  92     nocolorshader->set();
  93
  94     glDisable(GL_TEXTURE_2D);
  95     glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
  96     bool rendered = rendersky(explicitonly, zreflect);
  97     glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
  98     glEnable(GL_TEXTURE_2D);
  99
 100     defaultshader->set();
 101
 102     return rendered;
 103 }
 104
 105 void drawskyoutline()
 106 {
 107     notextureshader->set();
 108
 109     glDisable(GL_TEXTURE_2D);
 110     glDepthMask(GL_FALSE);
 111     extern int wireframe;
 112     if(!wireframe)
 113     {
 114         glEnable(GL_POLYGON_OFFSET_LINE);
 115         glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
 116     }
 117     glColor3f(0.5f, 0.0f, 0.5f);
 118     rendersky(true);
 119     if(!wireframe)
 120     {
 121         glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
 122         glDisable(GL_POLYGON_OFFSET_LINE);
 123     }
 124     glDepthMask(GL_TRUE);
 125     glEnable(GL_TEXTURE_2D);
 126
 127     defaultshader->set();
 128 }
 129
 130 void drawskybox(int farplane, bool limited, float zreflect)
 131 {
 132     if(limited && !zreflect)
 133     {
 134         if(!drawskylimits(false, 0) && !editmode && insideworld(camera1->o)) return;
 135     }
 136
 137     bool fog = glIsEnabled(GL_FOG)==GL_TRUE;
 138     if(fog) glDisable(GL_FOG);
 139
 140     glPushMatrix();
 141     glLoadIdentity();
 142     glRotatef(camera1->roll, 0, 0, 1);
 143     glRotatef(camera1->pitch, -1, 0, 0);
 144     glRotatef(camera1->yaw+spinsky*lastmillis/1000.0f, 0, 1, 0);
 145     glRotatef(90, 1, 0, 0);
 146     if(zreflect && camera1->o.z>=zreflect) glScalef(1, 1, -1);
 147     glColor3f(1, 1, 1);
 148     extern int ati_skybox_bug;
 149     if(limited) glDepthFunc(editmode || !insideworld(camera1->o) || ati_skybox_bug || zreflect ? GL_ALWAYS : GL_GEQUAL);
 150     draw_envbox(farplane/2, zreflect ? (zreflect+0.5f*(farplane-hdr.worldsize))/farplane : 0);
 151     glPopMatrix();
 152
 153     if(limited)
 154     {
 155         glDepthFunc(GL_LESS);
 156         if(!zreflect && editmode && showsky) drawskyoutline();
 157     }
 158
 159     if(fog) glEnable(GL_FOG);
 160 }
 161
 162 bool limitsky()
 163 {
 164     extern int ati_skybox_bug, explicitsky;
 165     extern double skyarea;
 166     return explicitsky || (!ati_skybox_bug && sparklyfix && skyarea / (double(hdr.worldsize)*double(hdr.worldsize)*6) < 0.9);
 167 }
 168