75 lines
2.3 KiB
C++
75 lines
2.3 KiB
C++
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <stdint.h>
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#include <SDL.h>
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#include <SDL_video.h>
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#include <SDL_image.h>
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#include <time.h>
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int main( int argc, const char* argv[] )
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{
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SDL_Window * win;
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SDL_Surface *image;
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Uint32 rmask, gmask, bmask, amask;
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const char name[] = "BLAH";
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if (SDL_Init(SDL_INIT_EVERYTHING) != 0)
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{
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SDL_Log("Unable to initialize SDL: %s", SDL_GetError());
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return 1;
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}
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win = SDL_CreateWindow(name, 0, 0, 500, 300, SDL_WINDOW_RESIZABLE);
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if (win == NULL) {
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// In the case that the window could not be made...
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printf("Could not create window: %s\n", SDL_GetError());
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return 1;
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}
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image = SDL_GetWindowSurface(win);
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printf("Pixel Width: %d, Pixel Heigth: %d\n", image->w, image->h);
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// image = SDL_ConvertSurfaceFormat(image, SDL_PIXELFORMAT_RGB444, 0);
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//Update the surface
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Uint32 *pixels = (Uint32 *)image->pixels;
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SDL_UpdateWindowSurface( win );
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bool run = true;
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while (run) {
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clock_t start_t, end_t;
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SDL_Event event;
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while (SDL_PollEvent(&event)) {
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/* handle your event here */
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if(event.type == SDL_MOUSEBUTTONDOWN)
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{
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if(event.button.button == SDL_BUTTON_MIDDLE) // scroll up
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{
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run = false;
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}
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else if(event.button.button == SDL_BUTTON_LEFT) // scroll up
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{
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//Update the surface
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SDL_LockSurface(image);
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for (size_t i = 0; i < (500*300); i++) {
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pixels[i] += 0xFF;
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}
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SDL_UnlockSurface(image);
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start_t = clock();
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SDL_UpdateWindowSurface(win);
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end_t = clock();
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printf("Time to draw a frame %f \n", ((double)(end_t - start_t)/(double)(CLOCKS_PER_SEC)));
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}
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}
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else if (event.type == SDL_QUIT)
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{
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run = false;
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}
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}
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/* do some other stuff here -- draw your app, etc. */
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}
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SDL_FreeSurface(image);
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SDL_DestroyWindow(win);
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return 0;
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}
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//g++ main.cpp -o blah `sdl2-config --cflags --libs`
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