[answered] can't get any 3rd party examples running

[chriscamacho]

I can't seem to get further than init... tried numerous 3rd party examples - all the built in examples work, but I can't get any traction with a simple 3rd party example independent of all the examplesGlue etc...

So far I have this:

#include <stdio.h>
#include <string.h>
#include "bgfx/bgfx.h"
#include "bgfx/platform.h"
#include "bx/math.h"

#define GLFW_INCLUDE_VULKAN
#include "GLFW/glfw3.h"

#ifdef __linux__
#define GLFW_EXPOSE_NATIVE_X11
#include "GLFW/glfw3native.h"
#else
#define GLFW_EXPOSE_NATIVE_WIN32
#include "GLFW/glfw3native.h"
#endif

#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 = "???";
//error: enumeration value 'Nvn' not handled in switch [-Werror=switch]  ???

    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;
        default: shaderPath = "shaders/"; break;  // TODO work out switch warning once we actually run this far...
    }

    printf("shader path %s\n", shaderPath);
    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);
    printf("file path %s\n", filePath);
    printf("file name %s\n", FILENAME);

    FILE *file = fopen(FILENAME, "rb"); // ?? file path not even used ??
    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();
    glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
    GLFWwindow* window = glfwCreateWindow(WNDW_WIDTH, WNDW_HEIGHT, "Hello, bgfx!", NULL, NULL);

    bgfx::PlatformData pd;
#ifdef __linux__
    pd.nwh = (void*)glfwGetX11Window(window);
#else
    pd.nwh = glfwGetWin32Window(window);
#endif
    bgfx::setPlatformData(pd);  // is this enough or should it be in init ???
    
printf("here 1\n");
    bgfx::Init bgfxInit;
    bgfxInit.type = bgfx::RendererType::Count; // ? count ?
    
    bgfxInit.type = bgfx::RendererType::Vulkan;
    
    bgfxInit.resolution.width = WNDW_WIDTH;
    bgfxInit.resolution.height = WNDW_HEIGHT;
    bgfxInit.resolution.reset = BGFX_RESET_VSYNC;
    bgfxInit.vendorId = BGFX_PCI_ID_NVIDIA; // just in case its selecting unused integrated device?
    bgfxInit.platformData = pd;
    bgfx::init(bgfxInit);
printf("here 2\n"); // never gets here

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

    // changed to VertexLayout
    bgfx::VertexLayout 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;
}

I've had to add Linux specific code because the example was windows only.

I think its to do with the native window handle, but after trying all sorts I'm stumped...

compiler flags from makefile

LDFLAGS:=  -Lbgfx/.build/linux64_gcc/bin -lbgfxDebug -lbimgDebug -lbimg_decodeDebug -lbxDebug
LDFLAGS+= -lglfw -lGL -lX11 -ldl -lpthread -lrt

any clues would be most appreciated !

[bkaradzic]

You're showing your code, and build options, and saying something is not working... But what is the actual problem?

[chriscamacho]

sorry!

Thread 2 "bgfx-test" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x7ffff2076640 (LWP 2740)]
0x00007ffff650a100 in XGetXCBConnection () from /usr/lib/libX11-xcb.so.1
(gdb) bt
#0  0x00007ffff650a100 in XGetXCBConnection () from /usr/lib/libX11-xcb.so.1
#1  0x00005555555d2c0f in bgfx::vk::RendererContextVK::createSurface (
    this=0x7ffff168e010, _resolution=...) at ../../../src/renderer_vk.cpp:1086
#2  0x00005555555d9693 in bgfx::vk::RendererContextVK::init (
    this=0x7ffff168e010, _init=...) at ../../../src/renderer_vk.cpp:2192
#3  0x00005555555c2e91 in bgfx::vk::rendererCreate (_init=...)
    at ../../../src/renderer_vk.cpp:4982
#4  0x000055555556fabc in bgfx::rendererCreate (_init=...)
    at ../../../src/bgfx.cpp:2707
#5  0x000055555556fcb9 in bgfx::Context::rendererExecCommands (
    this=0x7ffff3087040, _cmdbuf=...) at ../../../src/bgfx.cpp:2758
#6  0x000055555556f320 in bgfx::Context::renderFrame (this=0x7ffff3087040, 
    _msecs=5000) at ../../../src/bgfx.cpp:2394
#7  0x000055555556b3e1 in bgfx::renderFrame (_msecs=-1)
    at ../../../src/bgfx.cpp:1442
#8  0x0000555555589997 in bgfx::Context::renderThread ()
    at ../../../src/bgfx_p.h:2978
#9  0x000055555565fbcc in bx::Thread::entry (this=0x7ffff3087240)
    at ../../../../bx/src/thread.cpp:325
#10 0x000055555565f6f4 in bx::ThreadInternal::threadFunc (_arg=0x7ffff3087240)
    at ../../../../bx/src/thread.cpp:92
#11 0x00007ffff7b35eae in start_thread (arg=0x7ffff2076640)
    at pthread_create.c:463
--Type <RET> for more, q to quit, c to continue without paging--
#12 0x00007ffff76902ff in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95

call to init never returns

    bgfx::init(bgfxInit);
printf("here 2\n"); // never gets here

[chriscamacho]

how do I mark your second reply as the accepted answer ?

[bkaradzic]

No clue! :)

[chriscamacho]

:) well anyone else getting here will see what the issue and fix is so that the main thing, I'm going to tidy the code add input (glfwWindowShouldClose) and make a post about it on my site, the more examples out there the better!

[bkaradzic]

and make a post about it on my site, the more examples out there the better!

Once you're done, just post link here...

[chriscamacho]

https://bedroomcoders.co.uk/getting-started-with-bgfx-the-bring-your-own-framework-renderer/