https://dev.to/pperon/hello-bgfx-4dka

hello-bgfx.cpp

#include <stdio.h>
#include "bgfx/bgfx.h"
#include "bgfx/platform.h"
#include "bx/math.h"
#include "GLFW/glfw3.h"
#define GLFW_EXPOSE_NATIVE_WIN32
#include "GLFW/glfw3native.h"

#define WNDW_WIDTH 1600
#define WNDW_HEIGHT 900

struct PosColorVertex
{
	float x;
	float y;
	float z;
	uint32_t abgr;
};

static PosColorVertex cubeVertices[] =
{
	{-1.0f,  1.0f,  1.0f, 0xff000000 },
	{ 1.0f,  1.0f,  1.0f, 0xff0000ff },
	{-1.0f, -1.0f,  1.0f, 0xff00ff00 },
	{ 1.0f, -1.0f,  1.0f, 0xff00ffff },
	{-1.0f,  1.0f, -1.0f, 0xffff0000 },
	{ 1.0f,  1.0f, -1.0f, 0xffff00ff },
	{-1.0f, -1.0f, -1.0f, 0xffffff00 },
	{ 1.0f, -1.0f, -1.0f, 0xffffffff },
};

static const uint16_t cubeTriList[] =
{
	0, 1, 2,
	1, 3, 2,
	4, 6, 5,
	5, 6, 7,
	0, 2, 4,
	4, 2, 6,
	1, 5, 3,
	5, 7, 3,
	0, 4, 1,
	4, 5, 1,
	2, 3, 6,
	6, 3, 7,
};

bgfx::ShaderHandle loadShader(const char *FILENAME)
{
    const char* shaderPath = "???";

    switch(bgfx::getRendererType()) {
        case bgfx::RendererType::Noop:
        case bgfx::RendererType::Direct3D9:  shaderPath = "shaders/dx9/";   break;
        case bgfx::RendererType::Direct3D11:
        case bgfx::RendererType::Direct3D12: shaderPath = "shaders/dx11/";  break;
        case bgfx::RendererType::Gnm:        shaderPath = "shaders/pssl/";  break;
        case bgfx::RendererType::Metal:      shaderPath = "shaders/metal/"; break;
        case bgfx::RendererType::OpenGL:     shaderPath = "shaders/glsl/";  break;
        case bgfx::RendererType::OpenGLES:   shaderPath = "shaders/essl/";  break;
        case bgfx::RendererType::Vulkan:     shaderPath = "shaders/spirv/"; break;
    }

    size_t shaderLen = strlen(shaderPath);
    size_t fileLen = strlen(FILENAME);
    char *filePath = (char *)malloc(shaderLen + fileLen);
    memcpy(filePath, shaderPath, shaderLen);
    memcpy(&filePath[shaderLen], FILENAME, fileLen);

    FILE *file = fopen(FILENAME, "rb");
    fseek(file, 0, SEEK_END);
    long fileSize = ftell(file);
    fseek(file, 0, SEEK_SET);

    const bgfx::Memory *mem = bgfx::alloc(fileSize + 1);
    fread(mem->data, 1, fileSize, file);
    mem->data[mem->size - 1] = '\0';
    fclose(file);

    return bgfx::createShader(mem);
}

int main(void)
{
    glfwInit();
    GLFWwindow* window = glfwCreateWindow(WNDW_WIDTH, WNDW_HEIGHT, "Hello, bgfx!", NULL, NULL);

    bgfx::PlatformData pd;
    pd.nwh = glfwGetWin32Window(window);
    bgfx::setPlatformData(pd);

    bgfx::Init bgfxInit;
    bgfxInit.type = bgfx::RendererType::Count;
    bgfxInit.resolution.width = WNDW_WIDTH;
    bgfxInit.resolution.height = WNDW_HEIGHT;
    bgfxInit.resolution.reset = BGFX_RESET_VSYNC;
    bgfx::init(bgfxInit);

    bgfx::setViewClear(0, BGFX_CLEAR_COLOR | BGFX_CLEAR_DEPTH, 0x443355FF, 1.0f, 0);
    bgfx::setViewRect(0, 0, 0, WNDW_WIDTH, WNDW_HEIGHT);

    bgfx::VertexDecl pcvDecl;
    pcvDecl.begin()
        .add(bgfx::Attrib::Position, 3, bgfx::AttribType::Float)
        .add(bgfx::Attrib::Color0, 4, bgfx::AttribType::Uint8, true)
    .end();
    bgfx::VertexBufferHandle vbh = bgfx::createVertexBuffer(bgfx::makeRef(cubeVertices, sizeof(cubeVertices)), pcvDecl);
    bgfx::IndexBufferHandle ibh = bgfx::createIndexBuffer(bgfx::makeRef(cubeTriList, sizeof(cubeTriList)));

    bgfx::ShaderHandle vsh = loadShader("vs_cubes.bin");
    bgfx::ShaderHandle fsh = loadShader("fs_cubes.bin");
    bgfx::ProgramHandle program = bgfx::createProgram(vsh, fsh, true);

    unsigned int counter = 0;
    while(true) {
        const bx::Vec3 at = {0.0f, 0.0f,  0.0f};
        const bx::Vec3 eye = {0.0f, 0.0f, -5.0f};
        float view[16];
        bx::mtxLookAt(view, eye, at);
        float proj[16];
        bx::mtxProj(proj, 60.0f, float(WNDW_WIDTH) / float(WNDW_HEIGHT), 0.1f, 100.0f, bgfx::getCaps()->homogeneousDepth);
        bgfx::setViewTransform(0, view, proj);

        float mtx[16];
        bx::mtxRotateXY(mtx, counter * 0.01f, counter * 0.01f);
        bgfx::setTransform(mtx);
        
        bgfx::setVertexBuffer(0, vbh);
        bgfx::setIndexBuffer(ibh);
    
        bgfx::submit(0, program);
        bgfx::frame();
        counter++;
    }

    bgfx::destroy(ibh);
    bgfx::destroy(vbh);
    bgfx::shutdown();
    glfwDestroyWindow(window);
    glfwTerminate();

    return 0;
}

segfault. line 70 you're opening FILENAME instead of the filePath you just constructed. also less importantly you're not free'ing the malloc'd char* filePath.

thanks for the code though!