87 строки
1.9 KiB
C
87 строки
1.9 KiB
C
#include <stdio.h>
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#include <SDL2/SDL.h>
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#include <emscripten.h>
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#include <string.h>
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static const int COLOR_COUNT = 32;
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static SDL_Surface *screen;
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static SDL_Color pal[COLOR_COUNT +1];
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void pallete(int red, int green, int blue) {
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//initialize sdl palette
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//with gradient colors
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pal[0].r = 0;
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pal[0].g = 0;
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pal[0].b = 0;
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pal[0].a = 255;
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for (int i=1; i< 1 + COLOR_COUNT; i++) {
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pal[i].r = (float) red / COLOR_COUNT * i;
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pal[i].g = (float) green / COLOR_COUNT * i;
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pal[i].b = (float) blue / COLOR_COUNT * i;
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pal[i].a = 255;
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}
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SDL_SetPaletteColors(screen->format->palette, pal, 0, 1 + COLOR_COUNT);
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}
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int main(int argc, char** argv) {
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SDL_Init(SDL_INIT_VIDEO);
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SDL_Window *window;
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SDL_Renderer *renderer;
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SDL_CreateWindowAndRenderer(600, 450, 0, &window, &renderer);
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screen = SDL_CreateRGBSurface(0, 600, 450, 8, 0, 0, 0, 0);
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//test empty pallete
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SDL_LockSurface(screen);
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SDL_UnlockSurface(screen);
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//Draw gradient
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SDL_LockSurface(screen);
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int size = screen->h * screen->pitch;
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char *color = screen->pixels;
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int divider = size / COLOR_COUNT;
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int i = 0;
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while (i < size) {
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*color = 1 + (i / divider); //red
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color++;
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i++;
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}
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SDL_UnlockSurface(screen);
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//Set pallete
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if (argc > 1) {
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printf("%s\n", argv[1]);
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if (strcmp(argv[1], "-r") == 0) {
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printf("set [red]\n");
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pallete(255, 0, 0);
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}
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if (strcmp(argv[1], "-g") == 0) {
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printf("set [green]\n");
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pallete(0, 255, 0);
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}
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if (strcmp(argv[1], "-b") == 0) {
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printf("set [blue]\n");
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pallete(0, 0, 255);
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}
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}
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//refreshing
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SDL_LockSurface(screen);
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SDL_UnlockSurface(screen);
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SDL_Texture *screenTexture = SDL_CreateTextureFromSurface(renderer, screen);
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SDL_RenderClear(renderer);
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SDL_RenderCopy(renderer, screenTexture, NULL, NULL);
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SDL_RenderPresent(renderer);
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SDL_Quit();
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return 0;
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}
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