src/obj_external_candy.cxx

   1 /*
   2  * external_candy.cxx
   3  * Daniel Nelson - 10/13/0
   4  *
   5  * Copyright (C) 2000  Daniel Nelson
   6  * Copyright (C) 2004  Andrew Sayman
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * as published by the Free Software Foundation; either version 2
  11  * of the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21  *
  22  * Daniel Nelson - aluminumangel.org
  23  * 174 W. 18th Ave.
  24  * Columbus, OH  43210
  25  *
  26  * Generates lists and textures for candy external to the game.
  27  */
  28
  29 #include <GL/glut.h>
  30
  31 #include "glext.h"
  32
  33 using namespace std;
  34
  35 #include "TextureLoader.h"
  36 #include "Game.h"
  37 #include "Displayer.h"
  38 #include "MetaState.h"
  39 #include "GarbageFlavorImage.h"
  40
  41 GLuint Displayer::logo_texture;
  42 GLuint Displayer::losebar_texture;
  43
  44 GLuint Displayer::logo_list;
  45
  46 void Displayer::generateExternalCandy (   )
  47 {
  48   // the logo
  49
  50   glGenTextures(1, &logo_texture);
  51
  52   glBindTexture(GL_TEXTURE_2D, logo_texture);
  53
  54   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
  55   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
  56   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  57   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  58
  59   GLubyte *texture;
  60   if (MetaState::mode & CM_X)
  61     texture = TextureLoader::loadNoAlphaTGA(GC_X_LOGO_TEX_FILE_NAME,
  62      DC_LOGO_TEX_LENGTH, DC_LOGO_TEX_LENGTH);
  63   else
  64     texture = TextureLoader::loadNoAlphaTGA(GC_LOGO_TEX_FILE_NAME,
  65      DC_LOGO_TEX_LENGTH, DC_LOGO_TEX_LENGTH);
  66
  67 #if 0 // use to see the first entry in the garbage flavor texture set
  68   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, DC_GARBAGE_TEX_LENGTH,
  69    DC_GARBAGE_TEX_LENGTH, GL_FALSE, GL_RGBA, GL_UNSIGNED_BYTE,
  70    garbage_texture_data[0]);
  71 #else
  72   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, DC_LOGO_TEX_LENGTH,
  73    DC_LOGO_TEX_LENGTH, GL_FALSE, GL_RGB, GL_UNSIGNED_BYTE, texture);
  74 #endif
  75
  76   if (texture != null) {
  77     delete [] texture;
  78     texture = null;
  79   }
  80
  81   logo_list = glGenLists(1);
  82
  83   glNewList(logo_list, GL_COMPILE);
  84     glBegin(GL_TRIANGLE_STRIP);
  85
  86       glTexCoord2f(0.0f, 1.0f);
  87       glVertex3f(DC_LEFT_EXTERNAL_CENTER - DC_LOGO_LENGTH / 2.0f,
  88        DC_LOGO_OFFSET_Y - DC_LOGO_LENGTH / 2.0f, DC_EXTERNAL_OFFSET_Z);
  89       glTexCoord2f(1.0f, 1.0f);
  90       glVertex3f(DC_LEFT_EXTERNAL_CENTER + DC_LOGO_LENGTH / 2.0f,
  91        DC_LOGO_OFFSET_Y - DC_LOGO_LENGTH / 2.0f, DC_EXTERNAL_OFFSET_Z);
  92       glTexCoord2f(0.0f, 0.0f);
  93       glVertex3f(DC_LEFT_EXTERNAL_CENTER - DC_LOGO_LENGTH / 2.0f,
  94        DC_LOGO_OFFSET_Y + DC_LOGO_LENGTH / 2.0f, DC_EXTERNAL_OFFSET_Z);
  95       glTexCoord2f(1.0f, 0.0f);
  96       glVertex3f(DC_LEFT_EXTERNAL_CENTER + DC_LOGO_LENGTH / 2.0f,
  97        DC_LOGO_OFFSET_Y + DC_LOGO_LENGTH / 2.0f, DC_EXTERNAL_OFFSET_Z);
  98
  99     glEnd();
 100   glEndList();
 101
 102   // the losebar
 103
 104   glGenTextures(1, &losebar_texture);
 105
 106   glBindTexture(GL_TEXTURE_2D, losebar_texture);
 107
 108   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
 109   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
 110   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 111   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 112
 113   GLfloat lb_texture[DC_LOSEBAR_TEX_LENGTH_T][DC_LOSEBAR_TEX_LENGTH_S][2];
 114
 115   // calculate the losebar texture, because I'm better at math than at drawing
 116
 117   for (int s = DC_LOSEBAR_TEX_LENGTH_S; s--; ) {
 118
 119     // clamp left and right edges
 120     if (s == 0 || s == DC_LOSEBAR_TEX_LENGTH_S - 1) {
 121       for (int t = DC_LOSEBAR_TEX_LENGTH_T; t--; ) {
 122         lb_texture[t][s][0] = 0.0f;
 123         lb_texture[t][s][1] = 0.0f;
 124       }
 125       continue;
 126     }
 127
 128     GLfloat left = s * (1.0f / (GLfloat) DC_LOSEBAR_TEX_EFFECTIVE_LENGTH_S);
 129     for (int t = DC_LOSEBAR_TEX_LENGTH_T; t--; ) {
 130       GLfloat top = t * (1.0f / (GLfloat) DC_LOSEBAR_TEX_EFFECTIVE_LENGTH_S);
 131
 132       GLfloat lumin = 0.0f;
 133       GLfloat alpha = 0.0f;
 134
 135       for (int i = DC_LOSEBAR_ANTIALIAS_LENGTH; i--; ) {
 136         // runs from 0.0f to 1.0f
 137         GLfloat x = left + (i + 0.5f) * (1.0f
 138          / (GLfloat) (DC_LOSEBAR_TEX_EFFECTIVE_LENGTH_S
 139            * DC_LOSEBAR_ANTIALIAS_LENGTH));
 140
 141         for (int j = DC_LOSEBAR_ANTIALIAS_LENGTH; j--; ) {
 142           // runs from 0.0f to 2.0f * DC_LOSEBAR_END_RATIO
 143           GLfloat y = top + (j + 0.5f) * (1.0f
 144            / (GLfloat) (DC_LOSEBAR_TEX_EFFECTIVE_LENGTH_S
 145            * DC_LOSEBAR_ANTIALIAS_LENGTH));
 146
 147           GLfloat normal[3];
 148
 149           // left end
 150           if (x < DC_LOSEBAR_END_RATIO) {
 151             GLfloat r_sqrd = (y - DC_LOSEBAR_END_RATIO)
 152              * (y - DC_LOSEBAR_END_RATIO) + (DC_LOSEBAR_END_RATIO - x)
 153              * (DC_LOSEBAR_END_RATIO - x);
 154             if (r_sqrd >= (DC_LOSEBAR_END_RATIO * DC_LOSEBAR_END_RATIO))
 155               continue;
 156
 157             normal[0] = sin((DC_LOSEBAR_END_RATIO - x) * (0.5f * PI
 158              / DC_LOSEBAR_END_RATIO));
 159             normal[1] = cos(y * (0.5f * PI / DC_LOSEBAR_END_RATIO))
 160              * cos((DC_LOSEBAR_END_RATIO - x) * (0.5f * PI
 161              / DC_LOSEBAR_END_RATIO));
 162             normal[2] = sin(y * (0.5f * PI / DC_LOSEBAR_END_RATIO))
 163              * cos((DC_LOSEBAR_END_RATIO - x) * (0.5f * PI
 164              / DC_LOSEBAR_END_RATIO));
 165
 166           // right end
 167           } else if (x > (1.0f - DC_LOSEBAR_END_RATIO)) {
 168             GLfloat r_sqrd = (y - DC_LOSEBAR_END_RATIO)
 169              * (y - DC_LOSEBAR_END_RATIO) + ((1.0f - DC_LOSEBAR_END_RATIO) - x)
 170              * ((1.0f - DC_LOSEBAR_END_RATIO) - x);
 171             if (r_sqrd >= (DC_LOSEBAR_END_RATIO * DC_LOSEBAR_END_RATIO))
 172               continue;
 173
 174             normal[0] = sin(((1.0f - DC_LOSEBAR_END_RATIO) - x) * (0.5f * PI
 175              / DC_LOSEBAR_END_RATIO));
 176             normal[1] = cos(y * (0.5f * PI / DC_LOSEBAR_END_RATIO))
 177              * cos(((1.0f - DC_LOSEBAR_END_RATIO) - x) * (0.5f * PI
 178              / DC_LOSEBAR_END_RATIO));
 179             normal[2] = sin(y * (0.5f * PI / DC_LOSEBAR_END_RATIO))
 180              * cos(((1.0f - DC_LOSEBAR_END_RATIO) - x) * (0.5f * PI
 181              / DC_LOSEBAR_END_RATIO));
 182
 183           // center
 184           } else {
 185             normal[0] = 0.0f;
 186             normal[1] = cos(y * (0.5f * PI / DC_LOSEBAR_END_RATIO));
 187             normal[2] = sin(y * (0.5f * PI / DC_LOSEBAR_END_RATIO));
 188           }
 189
 190           float light = normal[0] * DC_LOSEBAR_LIGHT_VECTOR_X
 191            + normal[1] * DC_LOSEBAR_LIGHT_VECTOR_Y
 192            + normal[2] * DC_LOSEBAR_LIGHT_VECTOR_Z;
 193
 194           lumin += 1.0f - pow(1.0f - light, DC_LOSEBAR_LIGHT_SPECULAR_POWER);
 195
 196           alpha += DC_LOSEBAR_LIGHT_AMBIENT_RATIO
 197            + (1.0f - DC_LOSEBAR_LIGHT_AMBIENT_RATIO) * light;
 198         }
 199       }
 200
 201       lb_texture[t][s][0] = lumin * (1.0f
 202        / (GLfloat) (DC_LOSEBAR_ANTIALIAS_LENGTH * DC_LOSEBAR_ANTIALIAS_LENGTH));
 203       lb_texture[t][s][1] = alpha * (1.0f
 204        / (GLfloat) (DC_LOSEBAR_ANTIALIAS_LENGTH * DC_LOSEBAR_ANTIALIAS_LENGTH));
 205     }
 206   }
 207
 208   glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE_ALPHA, DC_LOSEBAR_TEX_LENGTH_S,
 209     DC_LOSEBAR_TEX_LENGTH_T, GL_FALSE, GL_LUMINANCE_ALPHA, GL_FLOAT,
 210     lb_texture);
 211 }