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Fiddling with bgfx examples
#120988 06/07/22 08:20 PM
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Hi guys,

Was curious about bgfx and saw some examples on the website https://bkaradzic.github.io/bgfx/examples.html

I wanted to see if I could compile the examples from the included 3rdparty bgfx


[Linked Image from i.imgur.com]

[Linked Image from i.imgur.com]




3rdparty/bgfx$ make
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Since I'm on linux, I'll do make linux-release64


bgfx$ make linux-release64
make -R -C .build/projects/gmake-linux config=release64
==== Building bx (release64) ====
==== Building bgfx (release64) ====
==== Building bimg (release64) ====
==== Building bgfx-shared-lib (release64) ====
==== Building bimg_decode (release64) ====
==== Building bimg_encode (release64) ====
==== Building example-glue (release64) ====
==== Building example-common (release64) ====
==== Building example-17-drawstress (release64) ====
==== Building example-25-c99 (release64) ====
==== Building examples (release64) ====
Linking examples
Running post-build commands
Stripping symbols.
==== Building fcpp (release64) ====
==== Building geometryc (release64) ====
==== Building geometryv (release64) ====
==== Building glsl-optimizer (release64) ====
==== Building glslang (release64) ====
==== Building spirv-opt (release64) ====
==== Building spirv-cross (release64) ====
==== Building shaderc (release64) ====
==== Building texturec (release64) ====
==== Building texturev (release64) ====



and to run the examples you have to be in the examples/runtime directory and launch it with running the examplesRelease executable in the .build directory

mame/3rdparty/bgfx/examples/runtime$ ../../.build/linux64_gcc/bin/examplesRelease

Some of those examples are extremely impressive:

There's around 40 or so examples, a few crashed but most work.

mame/3rdparty/bgfx/examples/runtime$ ../../.build/linux64_gcc/bin/geometryvRelease meshes/bunny.bin

[Linked Image from i.imgur.com]


I wonder how hard it would be to render mame's output to a texture and put it on a 3d model.
Re: Fiddling with bgfx examples
Golden Child #120989 06/07/22 08:46 PM
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What does this have to do with MAME other than your unrelated thought at the end? Start a blog or something. Please.
Re: Fiddling with bgfx examples
Golden Child #120990 06/07/22 09:02 PM
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That and MAME's output *is* a texture when you're using BGFX (and, honestly, most of the other backends).
Re: Fiddling with bgfx examples
R. Belmont #120996 06/09/22 07:57 AM
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Experimenting with changing the view matrix.

[Linked Image from i.imgur.com]


Code
void bgfx_ortho_view::setup_matrices() {
        float proj[16];
        float view[16];
        const bgfx::Caps* caps = bgfx::getCaps();

//      bx::mtxIdentity(view);
        const bx::Vec3 at  = { float(m_view_width / 2.0), float(m_view_height / 2.0), 0.0f };
        const bx::Vec3 eye = { 900.0f, 600.0f, 1500.0f };
        const bx::Vec3 up = { 0.25f, -1.0f, 0.0f };
        bx::mtxLookAt(view, eye, at, up);

//      bx::mtxOrtho(proj, 0.0f, m_view_width, m_view_height, 0.0f, m_z_near, m_z_far, 0.0f, caps->homogeneousDepth);
        bx::mtxProj(proj, 60.0f, float(m_view_width) / float(m_view_height), 0.0f, 100.0f, caps->homogeneousDepth);

        bgfx::setViewTransform(m_index, view, proj);
}

1 member likes this: Dullaron
Re: Fiddling with bgfx examples
Golden Child #120997 06/09/22 10:05 AM
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Dullaron Offline
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Nice you got the MAME menu moving with the game.

Last edited by Dullaron; 06/09/22 10:05 AM.
Windows 10 Home 64-bit / AMD Radeon RX 5700 XT / AMD Ryzen 7 3700X 8-Core 3.59 GHz / RAM 16 GB
Re: Fiddling with bgfx examples
Golden Child #121002 06/10/22 12:24 AM
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Here's a cool rotation spinning effect, I'd like to make it controllable with the mouse or keyboard.


in src/osd/modules/render/bgfx/view.cpp:
Code
void bgfx_ortho_view::setup_matrices() {
        float proj[16];
        float view[16];
        const bgfx::Caps* caps = bgfx::getCaps();

        static float rotation0 = 0.0;
        rotation0 += 0.0005;  // rotate at a slow speed
        static float rotation1 = 3.14 / 2.0;
        rotation1 += 0.0005;
        static float rotation2 = 3.14 / 2.0;
        rotation2 += 0.0005;

        const bx::Vec3 at  = { float(m_view_width / 2.0), float(m_view_height / 2.0), 0.0f };

// rotate in a horizontal circle
//        const bx::Vec3 eye = { float(cos(rotation0)*1000 + m_view_width / 2.0f), float( m_view_height / 2.0f), float(sin(rotation0)*1000) };
// rotate in a vertical circle
        const bx::Vec3 eye = { float(m_view_width / 2.0f), float(cos(rotation1)*1000 + m_view_height / 2.0f), float(sin(rotation1)*1000) };

//        const bx::Vec3 up = { 0.0f, -1.0f, 0.0f };  // straight up

        const bx::Vec3 up = { float(cos(rotation2)), float(-sin(rotation2)), 0.0f };


        bx::mtxLookAt(view, eye, at, up);

        bx::mtxProj(proj, 60.0f, float(m_view_width) / float(m_view_height), 0.0f, 100.0f, caps->homogeneousDepth);

        bgfx::setViewTransform(m_index, view, proj);
}


1 member likes this: Dullaron
Re: Fiddling with bgfx examples
Golden Child #121003 06/10/22 02:00 AM
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ICEknight Offline
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I think you can already do those things from the sliders menu in base MAME, including adding curvature to the monitor.

LCD artwork scans and cleanups: https://mega.nz/#F!uFYSzK7S!U-lJon9jsqyoCX_3y7_KLA
Re: Fiddling with bgfx examples
Golden Child #121004 06/10/22 06:08 AM
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Dullaron Offline
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Screen saver effect.

Windows 10 Home 64-bit / AMD Radeon RX 5700 XT / AMD Ryzen 7 3700X 8-Core 3.59 GHz / RAM 16 GB
Re: Fiddling with bgfx examples
ICEknight #121005 06/10/22 08:15 AM
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Originally Posted by ICEknight
I think you can already do those things from the sliders menu in base MAME, including adding curvature to the monitor.

You could conceivably define sliders in JSON, then modify the vertex shader to take those values and construct view/projection matrices based on values specified with those sliders. However, you would need to be running Windows in order to compile the new shader as well.

Moderated by  Bletch, R. Belmont, Richard Bannister 

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