clay/examples/SDL2-video-demo/main.c

#define CLAY_IMPLEMENTATION
#include "../../clay.h"
#include "../../renderers/SDL2/clay_renderer_SDL2.c"

#include <SDL.h>
#include <SDL_ttf.h>

#include <stdio.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include "../shared-layouts/clay-video-demo.c"

SDL_Surface *sample_image;

void HandleClayErrors(Clay_ErrorData errorData) {
    printf("%s", errorData.errorText.chars);
}

int main(int argc, char *argv[]) {
    if (SDL_Init(SDL_INIT_VIDEO) < 0) {
        fprintf(stderr, "Error: could not initialize SDL: %s\n", SDL_GetError());
        return 1;
    }
    if (TTF_Init() < 0) {
        fprintf(stderr, "Error: could not initialize TTF: %s\n", TTF_GetError());
        return 1;
    }
    if (IMG_Init(IMG_INIT_PNG) < 0) {
        fprintf(stderr, "Error: could not initialize IMG: %s\n", IMG_GetError());
        return 1;
    }

    TTF_Font *font = TTF_OpenFont("resources/Roboto-Regular.ttf", 16);
    if (!font) {
        fprintf(stderr, "Error: could not load font: %s\n", TTF_GetError());
        return 1;
    }

    SDL2_Font fonts[1] = {};

    fonts[FONT_ID_BODY_16] = (SDL2_Font) {
        .fontId = FONT_ID_BODY_16,
        .font = font,
    };

    sample_image = IMG_Load("resources/sample.png");

    SDL_Window *window = NULL;
    SDL_Renderer *renderer = NULL;
  
    SDL_SetHint(SDL_HINT_RENDER_DRIVER, "opengl"); //for antialiasing
    window = SDL_CreateWindow("SDL", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 800, 600, SDL_WINDOW_SHOWN | SDL_WINDOW_RESIZABLE);
    SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 4); //for antialiasing

    bool enableVsync = false;
    if(enableVsync){ renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);} //"SDL_RENDERER_ACCELERATED" is for antialiasing
    else{renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);}
    SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND); //for alpha blending

    uint64_t totalMemorySize = Clay_MinMemorySize();
    Clay_Arena clayMemory = Clay_CreateArenaWithCapacityAndMemory(totalMemorySize, malloc(totalMemorySize));

    int windowWidth = 0;
    int windowHeight = 0;
    SDL_GetWindowSize(window, &windowWidth, &windowHeight);
    Clay_Initialize(clayMemory, (Clay_Dimensions) { (float)windowWidth, (float)windowHeight }, (Clay_ErrorHandler) { HandleClayErrors });

    Clay_SetMeasureTextFunction(SDL2_MeasureText, &fonts);

    Uint64 NOW = SDL_GetPerformanceCounter();
    Uint64 LAST = 0;
    double deltaTime = 0;
    ClayVideoDemo_Data demoData = ClayVideoDemo_Initialize();

    while (true) {
        Clay_Vector2 scrollDelta = {};
        SDL_Event event;
        while (SDL_PollEvent(&event)) {
            switch (event.type) {
                case SDL_QUIT: { goto quit; }
                case SDL_MOUSEWHEEL: {
                    scrollDelta.x = event.wheel.x;
                    scrollDelta.y = event.wheel.y;
                    break;
                }
            }
        }
        LAST = NOW;
        NOW = SDL_GetPerformanceCounter();
        deltaTime = (double)((NOW - LAST)*1000 / (double)SDL_GetPerformanceFrequency() );
        printf("%f\n", deltaTime);

        int mouseX = 0;
        int mouseY = 0;
        Uint32 mouseState = SDL_GetMouseState(&mouseX, &mouseY);
        Clay_Vector2 mousePosition = (Clay_Vector2){ (float)mouseX, (float)mouseY };
        Clay_SetPointerState(mousePosition, mouseState & SDL_BUTTON(1));

        Clay_UpdateScrollContainers(
            true,
            (Clay_Vector2) { scrollDelta.x, scrollDelta.y },
            deltaTime
        );
        
        SDL_GetWindowSize(window, &windowWidth, &windowHeight);
        Clay_SetLayoutDimensions((Clay_Dimensions) { (float)windowWidth, (float)windowHeight });

        Clay_RenderCommandArray renderCommands = ClayVideoDemo_CreateLayout(&demoData);
        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
        SDL_RenderClear(renderer);

        Clay_SDL2_Render(renderer, renderCommands, fonts);

        SDL_RenderPresent(renderer);
    }

quit:
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    IMG_Quit();
    TTF_Quit();
    SDL_Quit();
    return 0;
}