3Dengine/main.cpp at master · hyperholy/3Dengine · GitHub

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#include "graphics_structs.h"
#include "render.h"
#include "scene.h"
#include "SDL3/SDL_main.h"

static int gDone;
SDL_Window* gSDLWindow;
SDL_Renderer* gSDLRenderer;
SDL_Texture* gSDLTexture;

/*global variable scene*/
Scene_t rendererScene;
/*global vec3d user input, i hate this*/
Vec3d_t userInput;
int sensitivity = 5;
/*
TODO
30fps -> 90fps
use bitshifts for colour mult
better early rejection for h_segment where its all 1.0
occulision culling
shading
textures
*/

bool update()
{
    SDL_Event e;
    if (SDL_PollEvent(&e))
    {
        if (e.type == SDL_EVENT_QUIT)
        {
            return false;
        }
        if (e.type == SDL_EVENT_KEY_UP && e.key.key == SDLK_ESCAPE) { return false; }
        if (e.type == SDL_EVENT_KEY_DOWN && e.key.key == SDLK_A) { userInput.x += sensitivity; }
        if (e.type == SDL_EVENT_KEY_DOWN && e.key.key == SDLK_LCTRL) { userInput.y += sensitivity; }
        if (e.type == SDL_EVENT_KEY_DOWN && e.key.key == SDLK_D) { userInput.x += -sensitivity; }
        if (e.type == SDL_EVENT_KEY_DOWN && e.key.key == SDLK_SPACE) { userInput.y += -sensitivity; }
        if (e.type == SDL_EVENT_KEY_DOWN && e.key.key == SDLK_W) { userInput.z += sensitivity; }
        if (e.type == SDL_EVENT_KEY_DOWN && e.key.key == SDLK_S) { userInput.z += -sensitivity; }
    }

    char* pix;
    int pitch;

    SDL_LockTexture(gSDLTexture, NULL, (void**)&pix, &pitch);
    for (int i = 0, sp = 0, dp = 0; i < WINDOW_HEIGHT; i++, dp += WINDOW_WIDTH, sp += pitch)
        memcpy(pix + sp, gFrameBuffer + dp, WINDOW_WIDTH * 4);

    SDL_UnlockTexture(gSDLTexture);
    SDL_RenderTexture(gSDLRenderer, gSDLTexture, NULL, NULL);
    SDL_RenderPresent(gSDLRenderer);
    SDL_RenderClear(gSDLRenderer);
    //SDL_Delay(1);//this eats 7 frames per second : (
    return true;
}

void render(Uint64 aTicks)/*does the funny rendering*/
{
    rendererScene.meshInstances[0].rot.x += (float).01;
    rendererScene.meshInstances[0].rot.y += (float).01;
    rendererScene.meshInstances[0].rot.z += (float).01;
    rendererScene.camera.position.x -= userInput.x;
    rendererScene.camera.position.y -= userInput.y;
    rendererScene.camera.position.z -= userInput.z;
    render_scene(rendererScene);
    userInput.x = 0.0;
    userInput.y = 0.0;
    userInput.z = 0.0;

}

void loop()
{
    if (!update())
    {
        gDone = 1;
#ifdef __EMSCRIPTEN__
        emscripten_cancel_main_loop();
#endif
    }
    else
{
        render(SDL_GetTicks());
    }
}

int main(int argc, char** argv)
{
    if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_EVENTS))
    {
        return -1;
    }
    gSDLWindow = SDL_CreateWindow("SDL3 window", WINDOW_WIDTH, WINDOW_HEIGHT, SDL_WINDOW_FULLSCREEN);
    gSDLRenderer = SDL_CreateRenderer(gSDLWindow, NULL);
    gSDLTexture = SDL_CreateTexture(gSDLRenderer, SDL_PIXELFORMAT_RGBA8888, SDL_TEXTUREACCESS_STREAMING, WINDOW_WIDTH, WINDOW_HEIGHT);

    if (!gFrameBuffer || !gSDLWindow || !gSDLRenderer || !gSDLTexture)
        return -1;

    gDone = 0;
#ifdef __EMSCRIPTEN__
    emscripten_set_main_loop(loop, 0, 1);
#else
    setup_scene(rendererScene);
    while (!gDone)
    {
        loop();
    }
#endif
    SDL_DestroyTexture(gSDLTexture);
    SDL_DestroyRenderer(gSDLRenderer);
    SDL_DestroyWindow(gSDLWindow);
    SDL_Quit();

    return 0;
}