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annotate test/testlines2.c @ 2895:9328f53a0ca2

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author Sam Lantinga <slouken@libsdl.org>
date Sat, 20 Dec 2008 23:10:20 +0000
parents e4bafaa29c65
children
rev   line source
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1
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2 /* Simple program: draw as many random lines on the screen as possible */
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3
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4 #include <stdlib.h>
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5 #include <stdio.h>
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6 #include <time.h>
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7
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8 #include "common.h"
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9
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10 #define NUM_LINES 100
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11
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12 static CommonState *state;
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13 static int num_lines;
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14 static SDL_bool cycle_color;
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15 static SDL_bool cycle_alpha;
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16 static int cycle_direction = 1;
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17 static int current_alpha = 255;
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18 static int current_color = 255;
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19 static SDL_BlendMode blendMode = SDL_BLENDMODE_NONE;
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20
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21 void
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22 DrawLines(SDL_WindowID window)
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23 {
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24 int i, n;
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25 int x1, y1, x2, y2;
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26 int window_w, window_h;
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27
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28 SDL_SelectRenderer(window);
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29
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30 /* Query the sizes */
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31 SDL_GetWindowSize(window, &window_w, &window_h);
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32
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33 /* Move the sprite, bounce at the wall, and draw */
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34 n = 0;
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35 SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
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36 SDL_RenderFill(NULL);
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37
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38 SDL_SetRenderDrawBlendMode(blendMode);
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39 for (i = 0; i < num_lines; ++i) {
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40 /* Cycle the color and alpha, if desired */
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41 if (cycle_color) {
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42 current_color += cycle_direction;
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43 if (current_color < 0) {
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44 current_color = 0;
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45 cycle_direction = -cycle_direction;
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46 }
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47 if (current_color > 255) {
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48 current_color = 255;
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49 cycle_direction = -cycle_direction;
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50 }
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51 }
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52 if (cycle_alpha) {
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53 current_alpha += cycle_direction;
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54 if (current_alpha < 0) {
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55 current_alpha = 0;
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56 cycle_direction = -cycle_direction;
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57 }
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58 if (current_alpha > 255) {
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59 current_alpha = 255;
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60 cycle_direction = -cycle_direction;
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61 }
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62 }
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63 SDL_SetRenderDrawColor(255, (Uint8) current_color,
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64 (Uint8) current_color, (Uint8) current_alpha);
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65
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66 if (i == 0) {
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67 SDL_RenderLine(0, 0, window_w, window_h);
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68 SDL_RenderLine(0, window_h, window_w, 0);
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69 SDL_RenderLine(0, window_h / 2, window_w, window_h / 2);
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70 SDL_RenderLine(window_w / 2, 0, window_w / 2, window_h);
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71 } else {
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72 x1 = rand() % window_w;
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73 x2 = rand() % window_w;
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74 y1 = rand() % window_h;
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75 y2 = rand() % window_h;
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76 SDL_RenderLine(x1, y1, x2, y2);
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77 }
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78 }
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79 SDL_SetRenderDrawBlendMode(SDL_BLENDMODE_NONE);
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80
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81 /* Update the screen! */
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82 SDL_RenderPresent();
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83 }
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84
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85 int
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86 main(int argc, char *argv[])
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87 {
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88 int i, done;
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89 SDL_Event event;
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90 Uint32 then, now, frames;
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91
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92 /* Initialize parameters */
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93 num_lines = NUM_LINES;
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94
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95 /* Initialize test framework */
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96 state = CommonCreateState(argv, SDL_INIT_VIDEO);
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97 if (!state) {
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98 return 1;
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99 }
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100 for (i = 1; i < argc;) {
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101 int consumed;
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102
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103 consumed = CommonArg(state, i);
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104 if (consumed == 0) {
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105 consumed = -1;
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106 if (SDL_strcasecmp(argv[i], "--blend") == 0) {
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107 if (argv[i + 1]) {
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108 if (SDL_strcasecmp(argv[i + 1], "none") == 0) {
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109 blendMode = SDL_BLENDMODE_NONE;
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110 consumed = 2;
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111 } else if (SDL_strcasecmp(argv[i + 1], "mask") == 0) {
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112 blendMode = SDL_BLENDMODE_MASK;
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113 consumed = 2;
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114 } else if (SDL_strcasecmp(argv[i + 1], "blend") == 0) {
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115 blendMode = SDL_BLENDMODE_BLEND;
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116 consumed = 2;
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117 } else if (SDL_strcasecmp(argv[i + 1], "add") == 0) {
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118 blendMode = SDL_BLENDMODE_ADD;
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119 consumed = 2;
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120 } else if (SDL_strcasecmp(argv[i + 1], "mod") == 0) {
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121 blendMode = SDL_BLENDMODE_MOD;
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122 consumed = 2;
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123 }
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124 }
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125 } else if (SDL_strcasecmp(argv[i], "--cyclecolor") == 0) {
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126 cycle_color = SDL_TRUE;
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127 consumed = 1;
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128 } else if (SDL_strcasecmp(argv[i], "--cyclealpha") == 0) {
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129 cycle_alpha = SDL_TRUE;
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130 consumed = 1;
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131 } else if (SDL_isdigit(*argv[i])) {
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132 num_lines = SDL_atoi(argv[i]);
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133 consumed = 1;
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134 }
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135 }
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136 if (consumed < 0) {
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137 fprintf(stderr,
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138 "Usage: %s %s [--blend none|mask|blend|add|mod] [--cyclecolor] [--cyclealpha]\n",
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139 argv[0], CommonUsage(state));
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140 return 1;
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141 }
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142 i += consumed;
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143 }
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144 if (!CommonInit(state)) {
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145 return 2;
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146 }
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147
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148 /* Create the windows and initialize the renderers */
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149 for (i = 0; i < state->num_windows; ++i) {
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150 SDL_SelectRenderer(state->windows[i]);
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151 SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
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152 SDL_RenderFill(NULL);
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153 }
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154
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155 srand(time(NULL));
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156
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157 /* Main render loop */
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158 frames = 0;
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159 then = SDL_GetTicks();
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160 done = 0;
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161 while (!done) {
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162 /* Check for events */
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163 ++frames;
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164 while (SDL_PollEvent(&event)) {
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165 CommonEvent(state, &event, &done);
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166 switch (event.type) {
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167 case SDL_WINDOWEVENT:
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168 switch (event.window.event) {
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169 case SDL_WINDOWEVENT_EXPOSED:
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170 SDL_SelectRenderer(event.window.windowID);
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171 SDL_SetRenderDrawColor(0xA0, 0xA0, 0xA0, 0xFF);
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172 SDL_RenderFill(NULL);
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173 break;
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174 }
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175 break;
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176 default:
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177 break;
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178 }
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179 }
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180 for (i = 0; i < state->num_windows; ++i) {
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181 DrawLines(state->windows[i]);
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182 }
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183 }
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184
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185 /* Print out some timing information */
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186 now = SDL_GetTicks();
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187 if (now > then) {
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188 double fps = ((double) frames * 1000) / (now - then);
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189 printf("%2.2f frames per second\n", fps);
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190 }
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191 return 0;
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192 }
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193
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194 /* vi: set ts=4 sw=4 expandtab: */