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rgb_gradient.cpp
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87 lines (72 loc) · 2.03 KB
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// -*- compile-command: "g++ main.cpp -o app -lmingw32 -lSDL2main -lSDL2" -*- for windows mingw
#include <cstdlib>
#include <ostream>
#include <random>
#define SDL_MAIN_HANDLED
#include <SDL2/SDL.h>
#include <iostream>
#include <functional>
#include <cstring>
#include "font8x8_basic.h"
using namespace std;
const int SCREEN_WIDTH = 640;
const int SCREEN_HEIGHT = 480;
uint32_t pixbuf[SCREEN_WIDTH * SCREEN_HEIGHT]; // one dimensional array of pixels
void draw_menu() {
for (int y = 0; y < SCREEN_HEIGHT; y++)
for (int x = 0; x < SCREEN_WIDTH; x++) {
uint8_t r = x % 256, g = y % 256, b = 0;
pixbuf[y * SCREEN_WIDTH + x] = (0xFF << 24) | (r << 16) | (g << 8) | b;
}
}
int main(){
if(SDL_Init(SDL_INIT_VIDEO) != 0){
std::cerr << "SDL Init Error: " << SDL_GetError() << std::endl;
return 1;
}
SDL_Window* window = SDL_CreateWindow(
"SoftRaster",
SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED,
640, 480,
SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE
);
if(!window){
std::cerr << "SDL Create Window Error: " << SDL_GetError() << std::endl;
SDL_Quit();
}
SDL_Renderer* renderer = SDL_CreateRenderer(
window, -1, SDL_RENDERER_ACCELERATED
);
if(!renderer){
std::cerr << "SDL Create Renderer Error: " << SDL_GetError() << std::endl;
SDL_DestroyWindow(window);
SDL_Quit();
return 1;
}
SDL_Texture* texture = SDL_CreateTexture(
renderer,
SDL_PIXELFORMAT_ARGB8888,
SDL_TEXTUREACCESS_STREAMING,
SCREEN_WIDTH,
SCREEN_HEIGHT
);
bool running = true;
SDL_Event event;
while (running) {
while (SDL_PollEvent(&event)) {
if (event.type == SDL_QUIT) running = false;
}
draw_menu();
SDL_UpdateTexture(texture, NULL, pixbuf, SCREEN_WIDTH * sizeof(uint32_t));
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer, texture, NULL, NULL);
SDL_RenderPresent(renderer);
SDL_Delay(16);
}
SDL_DestroyTexture(texture);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
return 0;
}