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annotate test/testpalette.c @ 2079:1ed2155b7ee4

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From: Torsten Giebl Subject: ALLOCA Patch for SDL-1.2 Newsgroups: gmane.comp.lib.sdl Date: 2006-10-24 00:31:16 GMT Hello ! As alloca.h is not available on CYGWIN and MinGW32 it should not be checked there or it should be checked with -mno-cygwin using. I am a total configure.in newbie, but i found the way that things are handled in configure.in pretty bad for the case CYGWIN with MinGW Mode or not. Maybe this is not possible but i would like to have a way to detect at the start for example CYGWIN and then add. ask if configure was called with --enable-cygwin for example. --enable-cygwin should be optional and disabled by default as we want to have MinGW Mode by default. Only if the user wants it he should be able to use it. Then the whole configure.in would get add. questions okay the system is CYGWIN with or without MinGW Mode. The alloca.h thing for example is only available under CYGWIN ( without MinGW Mode ). CU
author Ryan C. Gordon <icculus@icculus.org>
date Fri, 01 Dec 2006 20:25:03 +0000
parents c121d94672cb
children e27bdcc80744
rev   line source
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1 /*
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2 * testpalette.c
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3 *
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4 * A simple test of runtime palette modification for animation
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5 * (using the SDL_SetPalette() API).
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6 */
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7
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8 #include <stdio.h>
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9 #include <stdlib.h>
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10 #include <string.h>
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11 #include <math.h>
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12
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13 /* This isn't in the Windows headers */
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14 #ifndef M_PI
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15 #define M_PI 3.14159265358979323846
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16 #endif
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17
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18 #include "SDL.h"
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19
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20 /* screen size */
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21 #define SCRW 640
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22 #define SCRH 480
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23
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24 #define NBOATS 5
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25 #define SPEED 2
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26
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27 #ifndef MIN
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28 #define MIN(a, b) ((a) < (b) ? (a) : (b))
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29 #endif
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30 #ifndef MAX
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31 #define MAX(a, b) ((a) > (b) ? (a) : (b))
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32 #endif
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33
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34 /*
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35 * wave colours: Made by taking a narrow cross-section of a wave picture
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36 * in Gimp, saving in PPM ascii format and formatting with Emacs macros.
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37 */
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38 static SDL_Color wavemap[] = {
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39 {0, 2, 103}, {0, 7, 110}, {0, 13, 117}, {0, 19, 125},
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40 {0, 25, 133}, {0, 31, 141}, {0, 37, 150}, {0, 43, 158},
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41 {0, 49, 166}, {0, 55, 174}, {0, 61, 182}, {0, 67, 190},
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42 {0, 73, 198}, {0, 79, 206}, {0, 86, 214}, {0, 96, 220},
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43 {5, 105, 224}, {12, 112, 226}, {19, 120, 227}, {26, 128, 229},
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44 {33, 135, 230}, {40, 143, 232}, {47, 150, 234}, {54, 158, 236},
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45 {61, 165, 238}, {68, 173, 239}, {75, 180, 241}, {82, 188, 242},
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46 {89, 195, 244}, {96, 203, 246}, {103, 210, 248}, {112, 218, 250},
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47 {124, 224, 250}, {135, 226, 251}, {146, 229, 251}, {156, 231, 252},
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48 {167, 233, 252}, {178, 236, 252}, {189, 238, 252}, {200, 240, 252},
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49 {211, 242, 252}, {222, 244, 252}, {233, 247, 252}, {242, 249, 252},
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50 {237, 250, 252}, {209, 251, 252}, {174, 251, 252}, {138, 252, 252},
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51 {102, 251, 252}, {63, 250, 252}, {24, 243, 252}, {7, 225, 252},
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52 {4, 203, 252}, {3, 181, 252}, {2, 158, 252}, {1, 136, 251},
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53 {0, 111, 248}, {0, 82, 234}, {0, 63, 213}, {0, 50, 192},
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54 {0, 39, 172}, {0, 28, 152}, {0, 17, 132}, {0, 7, 114}
0
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55 };
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56
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57 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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58 static void
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59 quit(int rc)
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60 {
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61 SDL_Quit();
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62 exit(rc);
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63 }
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64
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65 static void
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66 sdlerr(char *when)
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67 {
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68 fprintf(stderr, "SDL error: %s: %s\n", when, SDL_GetError());
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69 quit(1);
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70 }
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71
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72 /* create a background surface */
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73 static SDL_Surface *
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74 make_bg(SDL_Surface * screen, int startcol)
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75 {
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76 int i;
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77 SDL_Surface *bg =
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78 SDL_CreateRGBSurface(SDL_SWSURFACE, screen->w, screen->h,
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79 8, 0, 0, 0, 0);
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80 if (!bg)
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81 sdlerr("creating background surface");
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82
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83 /* set the palette to the logical screen palette so that blits
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84 won't be translated */
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85 SDL_SetColors(bg, screen->format->palette->colors, 0, 256);
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86
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87 /* Make a wavy background pattern using colours 0-63 */
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88 if (SDL_LockSurface(bg) < 0)
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89 sdlerr("locking background");
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90 for (i = 0; i < SCRH; i++) {
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91 Uint8 *p = (Uint8 *) bg->pixels + i * bg->pitch;
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92 int j, d;
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93 d = 0;
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94 for (j = 0; j < SCRW; j++) {
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95 int v = MAX(d, -2);
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96 v = MIN(v, 2);
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97 if (i > 0)
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98 v += p[-bg->pitch] + 65 - startcol;
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99 p[j] = startcol + (v & 63);
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100 d += ((rand() >> 3) % 3) - 1;
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101 }
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102 }
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103 SDL_UnlockSurface(bg);
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104 return (bg);
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105 }
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106
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107 /*
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108 * Return a surface flipped horisontally. Only works for 8bpp;
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109 * extension to arbitrary bitness is left as an exercise for the reader.
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110 */
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111 static SDL_Surface *
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112 hflip(SDL_Surface * s)
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113 {
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114 int i;
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115 SDL_Surface *z = SDL_CreateRGBSurface(SDL_SWSURFACE, s->w, s->h, 8,
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116 0, 0, 0, 0);
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117 /* copy palette */
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118 SDL_SetColors(z, s->format->palette->colors,
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119 0, s->format->palette->ncolors);
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120 if (SDL_LockSurface(s) < 0 || SDL_LockSurface(z) < 0)
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121 sdlerr("locking flip images");
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122
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123 for (i = 0; i < s->h; i++) {
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124 int j;
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125 Uint8 *from = (Uint8 *) s->pixels + i * s->pitch;
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126 Uint8 *to = (Uint8 *) z->pixels + i * z->pitch + s->w - 1;
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127 for (j = 0; j < s->w; j++)
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128 to[-j] = from[j];
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129 }
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130
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131 SDL_UnlockSurface(z);
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132 SDL_UnlockSurface(s);
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133 return z;
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134 }
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135
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136 int
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137 main(int argc, char **argv)
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138 {
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139 SDL_Color cmap[256];
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140 SDL_Surface *screen;
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141 SDL_Surface *bg;
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142 SDL_Surface *boat[2];
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143 unsigned vidflags = 0;
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144 unsigned start;
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145 int fade_max = 400;
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146 int fade_level, fade_dir;
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147 int boatcols, frames, i, red;
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148 int boatx[NBOATS], boaty[NBOATS], boatdir[NBOATS];
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149 int gamma_fade = 0;
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150 int gamma_ramp = 0;
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151
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152 if (SDL_Init(SDL_INIT_VIDEO) < 0)
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153 sdlerr("initialising SDL");
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154
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155 while (--argc) {
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156 ++argv;
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157 if (strcmp(*argv, "-hw") == 0)
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158 vidflags |= SDL_HWSURFACE;
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159 else if (strcmp(*argv, "-fullscreen") == 0)
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160 vidflags |= SDL_FULLSCREEN;
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161 else if (strcmp(*argv, "-nofade") == 0)
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162 fade_max = 1;
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163 else if (strcmp(*argv, "-gamma") == 0)
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164 gamma_fade = 1;
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165 else if (strcmp(*argv, "-gammaramp") == 0)
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166 gamma_ramp = 1;
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167 else {
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168 fprintf(stderr,
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169 "usage: testpalette "
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170 " [-hw] [-fullscreen] [-nofade] [-gamma] [-gammaramp]\n");
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171 quit(1);
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172 }
0
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173 }
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174
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175 /* Ask explicitly for 8bpp and a hardware palette */
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176 if ((screen =
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177 SDL_SetVideoMode(SCRW, SCRH, 8, vidflags | SDL_HWPALETTE)) == NULL) {
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178 fprintf(stderr, "error setting %dx%d 8bpp indexed mode: %s\n",
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179 SCRW, SCRH, SDL_GetError());
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180 quit(1);
0
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181 }
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182
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183 if (vidflags & SDL_FULLSCREEN)
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184 SDL_ShowCursor(SDL_FALSE);
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185
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186 if ((boat[0] = SDL_LoadBMP("sail.bmp")) == NULL)
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187 sdlerr("loading sail.bmp");
0
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188 /* We've chosen magenta (#ff00ff) as colour key for the boat */
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189 SDL_SetColorKey(boat[0], SDL_SRCCOLORKEY | SDL_RLEACCEL,
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190 SDL_MapRGB(boat[0]->format, 0xff, 0x00, 0xff));
0
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191 boatcols = boat[0]->format->palette->ncolors;
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192 boat[1] = hflip(boat[0]);
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193 SDL_SetColorKey(boat[1], SDL_SRCCOLORKEY | SDL_RLEACCEL,
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194 SDL_MapRGB(boat[1]->format, 0xff, 0x00, 0xff));
0
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195
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196 /*
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197 * First set the physical screen palette to black, so the user won't
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198 * see our initial drawing on the screen.
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199 */
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200 memset(cmap, 0, sizeof(cmap));
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201 SDL_SetPalette(screen, SDL_PHYSPAL, cmap, 0, 256);
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202
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203 /*
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204 * Proper palette management is important when playing games with the
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205 * colormap. We have divided the palette as follows:
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206 *
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207 * index 0..(boatcols-1): used for the boat
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208 * index boatcols..(boatcols+63): used for the waves
0
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209 */
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210 SDL_SetPalette(screen, SDL_LOGPAL,
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211 boat[0]->format->palette->colors, 0, boatcols);
0
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212 SDL_SetPalette(screen, SDL_LOGPAL, wavemap, boatcols, 64);
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213
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214 /*
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215 * Now the logical screen palette is set, and will remain unchanged.
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216 * The boats already have the same palette so fast blits can be used.
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217 */
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218 memcpy(cmap, screen->format->palette->colors, 256 * sizeof(SDL_Color));
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219
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220 /* save the index of the red colour for later */
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221 red = SDL_MapRGB(screen->format, 0xff, 0x00, 0x00);
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222
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223 bg = make_bg(screen, boatcols); /* make a nice wavy background surface */
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224
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225 /* initial screen contents */
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226 if (SDL_BlitSurface(bg, NULL, screen, NULL) < 0)
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227 sdlerr("blitting background to screen");
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228 SDL_Flip(screen); /* actually put the background on screen */
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229
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230 /* determine initial boat placements */
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231 for (i = 0; i < NBOATS; i++) {
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232 boatx[i] = (rand() % (SCRW + boat[0]->w)) - boat[0]->w;
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233 boaty[i] = i * (SCRH - boat[0]->h) / (NBOATS - 1);
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234 boatdir[i] = ((rand() >> 5) & 1) * 2 - 1;
0
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235 }
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236
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237 start = SDL_GetTicks();
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238 frames = 0;
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239 fade_dir = 1;
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240 fade_level = 0;
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241 do {
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242 SDL_Event e;
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243 SDL_Rect updates[NBOATS];
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244 SDL_Rect r;
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245 int redphase;
0
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246
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247 /* A small event loop: just exit on any key or mouse button event */
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248 while (SDL_PollEvent(&e)) {
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249 if (e.type == SDL_KEYDOWN || e.type == SDL_QUIT
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250 || e.type == SDL_MOUSEBUTTONDOWN) {
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251 if (fade_dir < 0)
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252 fade_level = 0;
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253 fade_dir = -1;
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254 }
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255 }
0
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256
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257 /* move boats */
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258 for (i = 0; i < NBOATS; i++) {
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259 int old_x = boatx[i];
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260 /* update boat position */
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261 boatx[i] += boatdir[i] * SPEED;
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262 if (boatx[i] <= -boat[0]->w || boatx[i] >= SCRW)
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263 boatdir[i] = -boatdir[i];
0
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264
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265 /* paint over the old boat position */
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266 r.x = old_x;
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267 r.y = boaty[i];
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268 r.w = boat[0]->w;
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269 r.h = boat[0]->h;
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270 if (SDL_BlitSurface(bg, &r, screen, &r) < 0)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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271 sdlerr("blitting background");
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272
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273 /* construct update rectangle (bounding box of old and new pos) */
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274 updates[i].x = MIN(old_x, boatx[i]);
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275 updates[i].y = boaty[i];
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276 updates[i].w = boat[0]->w + SPEED;
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277 updates[i].h = boat[0]->h;
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278 /* clip update rectangle to screen */
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279 if (updates[i].x < 0) {
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280 updates[i].w += updates[i].x;
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281 updates[i].x = 0;
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282 }
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283 if (updates[i].x + updates[i].w > SCRW)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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284 updates[i].w = SCRW - updates[i].x;
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285 }
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286
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287 for (i = 0; i < NBOATS; i++) {
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288 /* paint boat on new position */
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289 r.x = boatx[i];
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290 r.y = boaty[i];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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291 if (SDL_BlitSurface(boat[(boatdir[i] + 1) / 2], NULL,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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292 screen, &r) < 0)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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293 sdlerr("blitting boat");
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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294 }
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295
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296 /* cycle wave palette */
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297 for (i = 0; i < 64; i++)
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298 cmap[boatcols + ((i + frames) & 63)] = wavemap[i];
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299
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300 if (fade_dir) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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301 /* Fade the entire palette in/out */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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302 fade_level += fade_dir;
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303
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304 if (gamma_fade) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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305 /* Fade linearly in gamma level (lousy) */
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306 float level = (float) fade_level / fade_max;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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307 if (SDL_SetGamma(level, level, level) < 0)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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308 sdlerr("setting gamma");
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309
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310 } else if (gamma_ramp) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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311 /* Fade using gamma ramp (better) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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312 Uint16 ramp[256];
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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313 for (i = 0; i < 256; i++)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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314 ramp[i] = (i * fade_level / fade_max) << 8;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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315 if (SDL_SetGammaRamp(ramp, ramp, ramp) < 0)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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316 sdlerr("setting gamma ramp");
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317
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318 } else {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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319 /* Fade using direct palette manipulation (best) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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320 memcpy(cmap, screen->format->palette->colors,
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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321 boatcols * sizeof(SDL_Color));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
322 for (i = 0; i < boatcols + 64; i++) {
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
323 cmap[i].r = cmap[i].r * fade_level / fade_max;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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324 cmap[i].g = cmap[i].g * fade_level / fade_max;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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325 cmap[i].b = cmap[i].b * fade_level / fade_max;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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326 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
327 }
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
328 if (fade_level == fade_max)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
329 fade_dir = 0;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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330 }
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diff changeset
331
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332 /* pulse the red colour (done after the fade, for a night effect) */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1815
diff changeset
333 redphase = frames % 64;
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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334 cmap[red].r = (int) (255 * sin(redphase * M_PI / 63));
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
335
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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336 SDL_SetPalette(screen, SDL_PHYSPAL, cmap, 0, boatcols + 64);
0
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diff changeset
337
1895
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338 /* update changed areas of the screen */
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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339 SDL_UpdateRects(screen, NBOATS, updates);
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
340 frames++;
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341 }
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diff changeset
342 while (fade_level > 0);
0
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diff changeset
343
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344 printf("%d frames, %.2f fps\n",
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345 frames, 1000.0 * frames / (SDL_GetTicks() - start));
1151
be9c9c8f6d53 Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents: 0
diff changeset
346
1895
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diff changeset
347 if (vidflags & SDL_FULLSCREEN)
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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diff changeset
348 SDL_ShowCursor(SDL_TRUE);
1151
be9c9c8f6d53 Removed atexit() from most of the test programs; atexit(SDL_Quit) isn't safe
Ryan C. Gordon <icculus@icculus.org>
parents: 0
diff changeset
349 SDL_Quit();
0
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diff changeset
350 return 0;
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diff changeset
351 }