lyrics.c

#include <stdio.h>
#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include "../src/nanovg.h"
#define NANOVG_GL2_IMPLEMENTATION
#include "../src/nanovg_gl.h"
/*#include "../example/perf.h"*/

struct Lyrics {
    int time;
    const char *str;
} lyrics[] = {
    { 0, "时光是琥珀 泪一滴滴被反锁" },
    { 658, "情书再不朽 也磨成沙漏" },
    { 1346, "青春的上游 白云飞走苍狗与海鸥" },
    { 2065, "闪过的念头 潺潺的溜走" },
    { 2652, "" },
    { 2721, "命运好幽默 让爱的人都沉默" },
    { 3413, "一整个宇宙 换一颗红豆" },
    { 4092, "回忆如困兽 寂寞太久而渐渐温柔" },
    { 4810, "放开了拳头 反而更自由" },
    { 5377, "" },
    { 5465, "慢动作 缱绻胶卷 " },
    { 5776, "重播默片 定格一瞬间" },
    { 6202, "我们在 告别的演唱会 " },
    { 6617, "说好不再见" },
    { 6860, "" },
    { 6902, "你写给我 我的第一首歌" },
    { 7476, "你和我 十指紧扣 默写前奏" },
    { 7980, "可是那然后呢" },
    { 8258, "还好我有 我这一首情歌" },
    { 8843, "轻轻的 轻轻哼着 哭着笑着" },
    { 9328, "我的 天长地久" },
    { 9929, "" },
    { 11469, "命运好幽默 让爱的人都沉默" },
    { 12157, "一整个宇宙 换一颗红豆" },
    { 12842, "回忆如困兽 寂寞太久而渐渐温柔" },
    { 13553, "放开了拳头 反而更自由" },
    { 14173, "" },
    { 14213, "长镜头 越拉越远 " },
    { 14533, "越来越远 事隔好几年" },
    { 14944, "我们在 怀念的演唱会 " },
    { 15366, "礼貌的吻别" },
    { 15789, "" },
    { 15819, "你写给我 我的第一首歌" },
    { 16397, "你和我 十指紧扣 默写前奏" },
    { 16899, "可是那然后呢" },
    { 17177, "还好我有 我这一首情歌" },
    { 17766, "轻轻的 轻轻哼着 哭着笑着" },
    { 18246, "我的 天长地久" },
    { 18854, "" },
    { 18896, "陪我唱歌 清唱你的情歌" },
    { 19487, "舍不得 短短副歌 心还热着" },
    { 19993, "也该告一段落" },
    { 20259, "还好我有 我下一首情歌" },
    { 20856, "生命宛如 静静的 相拥的河" },
    { 21333, "永远 天长地久" },
    { 22094, "" },
    { 22300, NULL },
};

static void errorcb(int error, const char* desc) {
    printf("GLFW error %d: %s\n", error, desc);
}

int idx = 0;

static void renderText(struct NVGcontext* ctx, int mx, int my, int w, int h, float t) {
    int time = t*100;
    int curr = lyrics[idx].time/3;
    int next = lyrics[idx+1].time/3;
    printf("\r[%d] time = %d, curr = %d, next = %d", idx, time, curr, next);
    nvgFontFace(ctx, "sans");
    nvgFontSize(ctx, 40);
    nvgGlobalAlpha(ctx, 1.0f);
    nvgFontBlur(ctx, 0);
    nvgTextAlign(ctx, NVG_ALIGN_CENTER|NVG_ALIGN_MIDDLE);
    if (time >= curr && time <= curr+30) {
        nvgGlobalAlpha(ctx, (0-curr+time)/30.0f);
        nvgFontBlur(ctx, 30+curr-time);
    }
    else if (time >= next-30) {
        nvgGlobalAlpha(ctx, (next-time)/30.0f);
        nvgFontBlur(ctx, 30-next+time);
    }
    nvgText(ctx, w/2, h/2, lyrics[idx].str, NULL);
    if (time >= next) {
        ++idx;   
        if (lyrics[idx].str == NULL) {
            idx = 0;
            glfwSetTime(0);
        }
    }
}

int main() {
    GLFWwindow* window;
    struct NVGcontext* vg = NULL;
    /*struct PerfGraph fps;*/
    int prevt;

    if (!glfwInit()) {
        printf("Failed to init GLFW.");
        return -1;
    }

    /*initGraph(&fps, GRAPH_RENDER_FPS, "Frame Time");*/

    glfwSetErrorCallback(errorcb);

    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 2);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
#ifdef DEMO_MSAA
    glfwWindowHint(GLFW_SAMPLES, 4);
#endif

    window = glfwCreateWindow(1000, 600, "NanoVG", NULL, NULL);
    //	window = glfwCreateWindow(1000, 600, "NanoVG", glfwGetPrimaryMonitor(), NULL);
    if (!window) {
        glfwTerminate();
        return -1;
    }

    glfwMakeContextCurrent(window);
    if (glewInit() != GLEW_OK) {
        printf("Could not init glew.\n");
        return -1;
    }

#ifdef DEMO_MSAA
    vg = nvgCreateGL2(NVG_STENCIL_STROKES);
#else
    vg = nvgCreateGL2(NVG_ANTIALIAS | NVG_STENCIL_STROKES);
#endif
    if (vg == NULL) {
        printf("Could not init nanovg.\n");
        return -1;
    }

    if (nvgCreateFont(vg, "sans", "./DroidSansFallback.ttf") == -1) {
        printf("Could not add font sans\n");
        return -1;
    }

    glfwSwapInterval(0);

    glfwSetTime(0);
    prevt = glfwGetTime();

    while (!glfwWindowShouldClose(window)) {
        if (glfwGetKey(window, GLFW_KEY_ESCAPE))
            break;

        double mx, my, t, dt;
        int winWidth, winHeight;
        int fbWidth, fbHeight;
        float pxRatio;

        t = glfwGetTime();
        dt = t - prevt;
        prevt = t;
        (void)dt;
        /*updateGraph(&fps, dt);*/

        glfwGetCursorPos(window, &mx, &my);
        glfwGetWindowSize(window, &winWidth, &winHeight);
        glfwGetFramebufferSize(window, &fbWidth, &fbHeight);

        // Calculate pixel ration for hi-dpi devices.
        pxRatio = (float)fbWidth / (float)winWidth;

        // Update and render
        glViewport(0, 0, fbWidth, fbHeight);
        glClearColor(0, 0, 0, 0);
        glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);

        nvgBeginFrame(vg, winWidth, winHeight, pxRatio);

        renderText(vg, mx, my, winWidth, winHeight, t);
        /*renderGraph(vg, 5, 5, &fps);*/

        nvgEndFrame(vg);

        glfwSwapBuffers(window);
        glfwPollEvents();
    }

    nvgDeleteGL2(vg);

    glfwTerminate();
    return 0;
}
/* cc: flags+='-ggdb'
 * cc: input+='../src/nanovg.c ../src/stb_image.c'
 * cc: libs+='-lglew -lglfw3 -lopengl32 -lgdi32' */