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annotate test/testshape.c @ 5053:b5b42be9333c

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Fixed bug #1026 Vittorio Giovara 2010-07-16 19:09:28 PDT i was reading SDL_renderer_gles and i noticed that every time we there is some gl call the gl state is modified with a couple of glEnableClientState()/glDisableClientState. While this is completely fine for desktops systems, this is a major performace kill on mobile devices, right where opengles is implemented. Normal practice in this case is to update the glstate once, keep it always the same and disable/enable other states only in very special occasions. On the web there's plenty of documentation (on the top of my head http://developer.apple.com/iphone/library/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/Performance/Performance.html#//apple_ref/doc/uid/TP40008793-CH105-SW5 ) and i personally tried this. I modified my code and got a 10 fps boost, then modified SDL_render_gles and shifted from 40 fps to 50 fps alone -- considering that i started from ~30fps i got an 80% performance increase with this technique. I have attached a dif of my changes, hope that it will be included in mainstream.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 19 Jan 2011 23:56:16 -0800
parents 6ccfbaef0c0a
children dc0dfdd58f27
rev   line source
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1 #include <stdlib.h>
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2 #include <math.h>
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3 #include <stdio.h>
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4 #include "SDL.h"
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5 #include "SDL_shape.h"
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6
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7 #define SHAPED_WINDOW_X 150
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8 #define SHAPED_WINDOW_Y 150
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9 #define SHAPED_WINDOW_DIMENSION 640
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10
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11 #define TICK_INTERVAL 1000/10
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12
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13 typedef struct LoadedPicture {
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14 SDL_Surface *surface;
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15 SDL_Texture *texture;
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16 SDL_WindowShapeMode mode;
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17 } LoadedPicture;
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18
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19 void render(SDL_Window* window,SDL_Texture *texture,SDL_Rect texture_dimensions) {
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20 SDL_SelectRenderer(window);
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21
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22 //Clear render-target to blue.
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23 SDL_SetRenderDrawColor(0x00,0x00,0xff,0xff);
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24 SDL_RenderClear();
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26 //Render the texture.
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27 SDL_RenderCopy(texture,&texture_dimensions,&texture_dimensions);
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28
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29 SDL_RenderPresent();
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30 }
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31
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32 static Uint32 next_time;
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33
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34 Uint32 time_left() {
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35 Uint32 now = SDL_GetTicks();
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36 if(next_time <= now)
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37 return 0;
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38 else
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39 return next_time - now;
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40 }
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41
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42 int main(int argc,char** argv) {
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43 Uint8 num_pictures;
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44 LoadedPicture* pictures;
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45 int i, j;
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46 SDL_PixelFormat* format = NULL;
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47 SDL_Window *window;
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48 SDL_Color black = {0,0,0,0xff};
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49 SDL_Event event;
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50 int event_pending = 0;
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51 int should_exit = 0;
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52 unsigned int current_picture;
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53 int button_down;
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54 Uint32 pixelFormat = 0;
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55 int access = 0;
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56 SDL_Rect texture_dimensions;;
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57
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58 if(argc < 2) {
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59 printf("SDL_Shape requires at least one bitmap file as argument.\n");
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60 exit(-1);
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61 }
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62
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63 if(SDL_VideoInit(NULL,0) == -1) {
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64 printf("Could not initialize SDL video.\n");
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65 exit(-2);
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66 }
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67
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68 num_pictures = argc - 1;
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69 pictures = (LoadedPicture *)malloc(sizeof(LoadedPicture)*num_pictures);
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70 for(i=0;i<num_pictures;i++)
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71 pictures[i].surface = NULL;
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72 for(i=0;i<num_pictures;i++) {
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73 pictures[i].surface = SDL_LoadBMP(argv[i+1]);
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74 if(pictures[i].surface == NULL) {
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75 j = 0;
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76 for(j=0;j<num_pictures;j++)
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77 if(pictures[j].surface != NULL)
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78 SDL_FreeSurface(pictures[j].surface);
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79 free(pictures);
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80 SDL_VideoQuit();
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81 printf("Could not load surface from named bitmap file.\n");
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82 exit(-3);
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83 }
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84
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85 format = pictures[i].surface->format;
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86 if(format->Amask != 0) {
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87 pictures[i].mode.mode = ShapeModeBinarizeAlpha;
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88 pictures[i].mode.parameters.binarizationCutoff = 255;
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89 }
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90 else {
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91 pictures[i].mode.mode = ShapeModeColorKey;
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92 pictures[i].mode.parameters.colorKey = black;
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93 }
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94 }
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95
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96 window = SDL_CreateShapedWindow("SDL_Shape test",SHAPED_WINDOW_X,SHAPED_WINDOW_Y,SHAPED_WINDOW_DIMENSION,SHAPED_WINDOW_DIMENSION,SDL_WINDOW_RESIZABLE | SDL_WINDOW_SHOWN);
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97 if(window == NULL) {
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98 for(i=0;i<num_pictures;i++)
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99 SDL_FreeSurface(pictures[i].surface);
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100 free(pictures);
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101 SDL_VideoQuit();
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102 printf("Could not create shaped window for SDL_Shape.\n");
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103 exit(-4);
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104 }
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105 if(SDL_CreateRenderer(window,-1,SDL_RENDERER_PRESENTFLIP2) == -1) {
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106 SDL_DestroyWindow(window);
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107 for(i=0;i<num_pictures;i++)
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108 SDL_FreeSurface(pictures[i].surface);
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109 free(pictures);
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110 SDL_VideoQuit();
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111 printf("Could not create rendering context for SDL_Shape window.\n");
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112 exit(-5);
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113 }
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114
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115 for(i=0;i<num_pictures;i++)
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116 pictures[i].texture = NULL;
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117 for(i=0;i<num_pictures;i++) {
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118 pictures[i].texture = SDL_CreateTextureFromSurface(0,pictures[i].surface);
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119 if(pictures[i].texture == NULL) {
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120 j = 0;
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121 for(j=0;j<num_pictures;i++)
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122 if(pictures[i].texture != NULL)
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123 SDL_DestroyTexture(pictures[i].texture);
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124 for(i=0;i<num_pictures;i++)
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125 SDL_FreeSurface(pictures[i].surface);
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126 free(pictures);
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127 SDL_DestroyRenderer(window);
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128 SDL_DestroyWindow(window);
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129 SDL_VideoQuit();
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130 printf("Could not create texture for SDL_shape.\n");
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131 exit(-6);
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132 }
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133 }
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134
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135 event_pending = 0;
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136 should_exit = 0;
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137 event_pending = SDL_PollEvent(&event);
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138 current_picture = 0;
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139 button_down = 0;
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140 texture_dimensions.h = 0;
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141 texture_dimensions.w = 0;
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142 texture_dimensions.x = 0;
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143 texture_dimensions.y = 0;
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144 SDL_QueryTexture(pictures[current_picture].texture,(Uint32 *)&pixelFormat,(int *)&access,&texture_dimensions.w,&texture_dimensions.h);
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145 SDL_SetWindowSize(window,texture_dimensions.w,texture_dimensions.h);
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146 SDL_SetWindowShape(window,pictures[current_picture].surface,&pictures[current_picture].mode);
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147 next_time = SDL_GetTicks() + TICK_INTERVAL;
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148 while(should_exit == 0) {
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149 event_pending = SDL_PollEvent(&event);
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150 if(event_pending == 1) {
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151 if(event.type == SDL_KEYDOWN) {
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152 button_down = 1;
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153 if(event.key.keysym.sym == SDLK_ESCAPE)
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154 should_exit = 1;
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155 }
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156 if(button_down && event.type == SDL_KEYUP) {
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157 button_down = 0;
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158 current_picture += 1;
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159 if(current_picture >= num_pictures)
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160 current_picture = 0;
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161 SDL_QueryTexture(pictures[current_picture].texture,(Uint32 *)&pixelFormat,(int *)&access,&texture_dimensions.w,&texture_dimensions.h);
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162 SDL_SetWindowSize(window,texture_dimensions.w,texture_dimensions.h);
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163 SDL_SetWindowShape(window,pictures[current_picture].surface,&pictures[current_picture].mode);
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164 }
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165 if(event.type == SDL_QUIT)
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166 should_exit = 1;
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167 event_pending = 0;
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168 }
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169 render(window,pictures[current_picture].texture,texture_dimensions);
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170 SDL_Delay(time_left());
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171 next_time += TICK_INTERVAL;
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172 }
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173
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174 //Free the textures.
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175 for(i=0;i<num_pictures;i++)
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176 SDL_DestroyTexture(pictures[i].texture);
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177 //Destroy the window.
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178 SDL_DestroyWindow(window);
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179 //Free the original surfaces backing the textures.
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180 for(i=0;i<num_pictures;i++)
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181 SDL_FreeSurface(pictures[i].surface);
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182 free(pictures);
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183 //Call SDL_VideoQuit() before quitting.
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184 SDL_VideoQuit();
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185
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186 return 0;
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187 }