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 #include "TextureLoader.h"
  34 #include "Game.h"
  35 #include "Displayer.h"
  36 #include "MetaState.h"
  37 #include "GarbageFlavorImage.h"
  38
  39 GLuint Displayer::logo_texture;
  40 GLuint Displayer::losebar_texture;
  41
  42 GLuint Displayer::logo_list;
  43
  44 void Displayer::generateExternalCandy (   )
  45 {
  46   // the logo
  47
  48   glGenTextures(1, &logo_texture);
  49
  50   glBindTexture(GL_TEXTURE_2D, logo_texture);
  51
  52   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
  53   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
  54   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  55   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  56
  57   GLubyte *texture;
  58   if (MetaState::mode & CM_X)
  59     texture = TextureLoader::loadNoAlphaTGA(GC_X_LOGO_TEX_FILE_NAME,
  60      DC_LOGO_TEX_LENGTH, DC_LOGO_TEX_LENGTH);
  61   else
  62     texture = TextureLoader::loadNoAlphaTGA(GC_LOGO_TEX_FILE_NAME,
  63      DC_LOGO_TEX_LENGTH, DC_LOGO_TEX_LENGTH);
  64
  65 #if 0 // use to see the first entry in the garbage flavor texture set
  66   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, DC_GARBAGE_TEX_LENGTH,
  67    DC_GARBAGE_TEX_LENGTH, GL_FALSE, GL_RGBA, GL_UNSIGNED_BYTE,
  68    garbage_texture_data[0]);
  69 #else
  70   glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, DC_LOGO_TEX_LENGTH,
  71    DC_LOGO_TEX_LENGTH, GL_FALSE, GL_RGB, GL_UNSIGNED_BYTE, texture);
  72 #endif
  73
  74   if (texture != null) {
  75     delete [] texture;
  76     texture = null;
  77   }
  78
  79   logo_list = glGenLists(1);
  80
  81   glNewList(logo_list, GL_COMPILE);
  82     glBegin(GL_TRIANGLE_STRIP);
  83
  84       glTexCoord2f(0.0f, 1.0f);
  85       glVertex3f(DC_LEFT_EXTERNAL_CENTER - DC_LOGO_LENGTH / 2.0f,
  86        DC_LOGO_OFFSET_Y - DC_LOGO_LENGTH / 2.0f, DC_EXTERNAL_OFFSET_Z);
  87       glTexCoord2f(1.0f, 1.0f);
  88       glVertex3f(DC_LEFT_EXTERNAL_CENTER + DC_LOGO_LENGTH / 2.0f,
  89        DC_LOGO_OFFSET_Y - DC_LOGO_LENGTH / 2.0f, DC_EXTERNAL_OFFSET_Z);
  90       glTexCoord2f(0.0f, 0.0f);
  91       glVertex3f(DC_LEFT_EXTERNAL_CENTER - DC_LOGO_LENGTH / 2.0f,
  92        DC_LOGO_OFFSET_Y + DC_LOGO_LENGTH / 2.0f, DC_EXTERNAL_OFFSET_Z);
  93       glTexCoord2f(1.0f, 0.0f);
  94       glVertex3f(DC_LEFT_EXTERNAL_CENTER + DC_LOGO_LENGTH / 2.0f,
  95        DC_LOGO_OFFSET_Y + DC_LOGO_LENGTH / 2.0f, DC_EXTERNAL_OFFSET_Z);
  96
  97     glEnd();
  98   glEndList();
  99
 100   // the losebar
 101
 102   glGenTextures(1, &losebar_texture);
 103
 104   glBindTexture(GL_TEXTURE_2D, losebar_texture);
 105
 106   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
 107   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
 108   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 109   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 110
 111   GLfloat lb_texture[DC_LOSEBAR_TEX_LENGTH_T][DC_LOSEBAR_TEX_LENGTH_S][2];
 112
 113   // calculate the losebar texture, because I'm better at math than at drawing
 114
 115   for (int s = DC_LOSEBAR_TEX_LENGTH_S; s--; ) {
 116
 117     // clamp left and right edges
 118     if (s == 0 || s == DC_LOSEBAR_TEX_LENGTH_S - 1) {
 119       for (int t = DC_LOSEBAR_TEX_LENGTH_T; t--; ) {
 120         lb_texture[t][s][0] = 0.0f;
 121         lb_texture[t][s][1] = 0.0f;
 122       }
 123       continue;
 124     }
 125
 126     GLfloat left = s * (1.0f / (GLfloat) DC_LOSEBAR_TEX_EFFECTIVE_LENGTH_S);
 127     for (int t = DC_LOSEBAR_TEX_LENGTH_T; t--; ) {
 128       GLfloat top = t * (1.0f / (GLfloat) DC_LOSEBAR_TEX_EFFECTIVE_LENGTH_S);
 129
 130       GLfloat lumin = 0.0f;
 131       GLfloat alpha = 0.0f;
 132
 133       for (int i = DC_LOSEBAR_ANTIALIAS_LENGTH; i--; ) {
 134         // runs from 0.0f to 1.0f
 135         GLfloat x = left + (i + 0.5f) * (1.0f
 136          / (GLfloat) (DC_LOSEBAR_TEX_EFFECTIVE_LENGTH_S
 137            * DC_LOSEBAR_ANTIALIAS_LENGTH));
 138
 139         for (int j = DC_LOSEBAR_ANTIALIAS_LENGTH; j--; ) {
 140           // runs from 0.0f to 2.0f * DC_LOSEBAR_END_RATIO
 141           GLfloat y = top + (j + 0.5f) * (1.0f
 142            / (GLfloat) (DC_LOSEBAR_TEX_EFFECTIVE_LENGTH_S
 143            * DC_LOSEBAR_ANTIALIAS_LENGTH));
 144
 145           GLfloat normal[3];
 146
 147           // left end
 148           if (x < DC_LOSEBAR_END_RATIO) {
 149             GLfloat r_sqrd = (y - DC_LOSEBAR_END_RATIO)
 150              * (y - DC_LOSEBAR_END_RATIO) + (DC_LOSEBAR_END_RATIO - x)
 151              * (DC_LOSEBAR_END_RATIO - x);
 152             if (r_sqrd >= (DC_LOSEBAR_END_RATIO * DC_LOSEBAR_END_RATIO))
 153               continue;
 154
 155             normal[0] = sin((DC_LOSEBAR_END_RATIO - x) * (0.5f * PI
 156              / DC_LOSEBAR_END_RATIO));
 157             normal[1] = cos(y * (0.5f * PI / DC_LOSEBAR_END_RATIO))
 158              * cos((DC_LOSEBAR_END_RATIO - x) * (0.5f * PI
 159              / DC_LOSEBAR_END_RATIO));
 160             normal[2] = sin(y * (0.5f * PI / DC_LOSEBAR_END_RATIO))
 161              * cos((DC_LOSEBAR_END_RATIO - x) * (0.5f * PI
 162              / DC_LOSEBAR_END_RATIO));
 163
 164           // right end
 165           } else if (x > (1.0f - DC_LOSEBAR_END_RATIO)) {
 166             GLfloat r_sqrd = (y - DC_LOSEBAR_END_RATIO)
 167              * (y - DC_LOSEBAR_END_RATIO) + ((1.0f - DC_LOSEBAR_END_RATIO) - x)
 168              * ((1.0f - DC_LOSEBAR_END_RATIO) - x);
 169             if (r_sqrd >= (DC_LOSEBAR_END_RATIO * DC_LOSEBAR_END_RATIO))
 170               continue;
 171
 172             normal[0] = sin(((1.0f - DC_LOSEBAR_END_RATIO) - x) * (0.5f * PI
 173              / DC_LOSEBAR_END_RATIO));
 174             normal[1] = cos(y * (0.5f * PI / DC_LOSEBAR_END_RATIO))
 175              * cos(((1.0f - DC_LOSEBAR_END_RATIO) - x) * (0.5f * PI
 176              / DC_LOSEBAR_END_RATIO));
 177             normal[2] = sin(y * (0.5f * PI / DC_LOSEBAR_END_RATIO))
 178              * cos(((1.0f - DC_LOSEBAR_END_RATIO) - x) * (0.5f * PI
 179              / DC_LOSEBAR_END_RATIO));
 180
 181           // center
 182           } else {
 183             normal[0] = 0.0f;
 184             normal[1] = cos(y * (0.5f * PI / DC_LOSEBAR_END_RATIO));
 185             normal[2] = sin(y * (0.5f * PI / DC_LOSEBAR_END_RATIO));
 186           }
 187
 188           float light = normal[0] * DC_LOSEBAR_LIGHT_VECTOR_X
 189            + normal[1] * DC_LOSEBAR_LIGHT_VECTOR_Y
 190            + normal[2] * DC_LOSEBAR_LIGHT_VECTOR_Z;
 191
 192           lumin += 1.0f - pow(1.0f - light, DC_LOSEBAR_LIGHT_SPECULAR_POWER);
 193
 194           alpha += DC_LOSEBAR_LIGHT_AMBIENT_RATIO
 195            + (1.0f - DC_LOSEBAR_LIGHT_AMBIENT_RATIO) * light;
 196         }
 197       }
 198
 199       lb_texture[t][s][0] = lumin * (1.0f
 200        / (GLfloat) (DC_LOSEBAR_ANTIALIAS_LENGTH * DC_LOSEBAR_ANTIALIAS_LENGTH));
 201       lb_texture[t][s][1] = alpha * (1.0f
 202        / (GLfloat) (DC_LOSEBAR_ANTIALIAS_LENGTH * DC_LOSEBAR_ANTIALIAS_LENGTH));
 203     }
 204   }
 205
 206   glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE_ALPHA, DC_LOSEBAR_TEX_LENGTH_S,
 207     DC_LOSEBAR_TEX_LENGTH_T, GL_FALSE, GL_LUMINANCE_ALPHA, GL_FLOAT,
 208     lb_texture);
 209 }