is there a step by step how to compile, run, required libs....
i have spent some time now trying to compile the code and been having issues with assimp and zilb.

tx.

I'm just a new beginner, want to run your code on my computer and try to learn something, my compiler told me this problem, and the next two lines too.

The readme suggests open source, but there doesn't seem to be any indication of what licence you are releasing this under.

Hey joey.

Opengl is great but what do you think about having directx/opengl es too? I might be able to implement directx versions of the classes in your project and all you have to do is ask in the constructor of cell for which backend to choose.
Vulkan is new so most of the android devices don't support it. So isn't it a good idea to make your engine( with opengl es) also run on android?

I tried running your engine, and i gotta say, it's a very good structured engine!
So i wanted to give it a go, with another demo using my own models.
However, something is off with the shadows.
It looks like the shadows is losing resolution from the center.

Center:

Away:

Do you know what is causing this? I believed it was something to do with the shadow depth framebuffer, but it doesn't seem to be the case. The shadow depth rendertarget is completely normal. It seems so odd, I've never run into something like this.

dirLight.shadowBias = 0.0004;
dirLight.shadowSize = math::vec2(8192, 8192);
dirLight.shadowFrustumDimension = 100;
dirLight.shadowFrustumFar = 85;
dirLight.shadowFrustumNear = -45.0;
dirLight.Direction = math::vec3(-0.25f, -0.375f, -0.20f);

I was just compiling and going through https://github.com/JoeyDeVries/LearnOpenGL which is IMO best OpenGL tutorial I ever saw. It is also great that it compile with cmake on linux without any problem. Would be really great if this game engine would do as well. (Like continuation - putting it all together)

Hi Joey!

Would you be open to a Nim port of this project? I'd like to also use BGFX as the rendering API rather than OpenGL.

If you're cool with the above - I'll probably get started this evening.

Thanks!

-Zach

In quaternion.h

inline vec4 quaternion::ToAxisAngle()
    {
        vec4 result;
        
        const float angle  = 2.0f * acos(w);
        const float length = sqrt(1.0f - angle*angle);

        result.xyz = vec3(x, y, z) / length;
        result.w   = angle;

        return result;
}

At the time calculating length it should be length = sqrt(1.0f - w*w); . And we should also check for length != 0. As per your previous code we can get angle greater than 1 so at that time the length will be undefined.

Hello Joey, I see that you are using my Screen Space Reflections shader implementation, I'm glad that you found it useful, and I'm ok with you using it without any changes to my original code as shown here and here, but I would also like to see a link or some kind of credits to the original author inside the shader, since it's licensed under GNU General Public License v3.0

Greetings

hi bro, I find a tiny bug in file sphere.cpp:18
float xSegment = (float)x / (float)ySegments;
it should divide with xSegments not ySegments.

I just find it while copy this part into my project haha. I need to thank you for your great work! and tell u, we are still with u.

Hi Joey,

I noticed random black rectangles jumping off on the screen when I tested the app on my Quadro 2000 GPU. Did you find the effect on your device when running the app? If yes but hard to pin a black rectangle, you can move camera into any of 4 point light volumes.

If so, you can change only 'brdf.glsl' to avoid it. First add a epsilon to the denominator of DistributionGGX, the only one function of 3 GGXs where both the nominator and denominator can possibly equal to 0. Secondly, change expression 'pow(1.0 - cosTheta, 5.0)' to 'pow(max(1.0 - cosTheta, 0.0), 5.0)'. Here the cosTheta = dot(N, V) can be a little bigger than 1.0. The behavior of pow can be found here: [https://docs.microsoft.com/en-us/windows/win32/direct3dhlsl/dx-graphics-hlsl-pow](pow function in HLSL).

Specifically the black rectangle was caused by blur shader expanding NAN in our color buffer. If there is any NAN in the input color attachment the blur process will enlarge it and the pixels neighboring NAN one will become NAN too after this pass. After final pass all NAN pixels form the black rectangle on the screen. The NAN pixel is generally caused by undefined behaviors in shader, like 0/0 or pow(-1, 5).

These are potential glitches I found, not all of them. Wish it helps anyone confused by annoying black area :).

I was wondering if anyone could help me to setup the project. Thanks

I compile the source code of cell demo and load nanosuit model.
But I see the display effect is not right as the figure below ...

Nanosuit should be as the figure below

Anything do I miss?

I was looking at the code for quaternion vector rotation (multiplication) (line 141, math/linear_algebra/quaternion.h), and it seems to me that the formula shown in the comment was incorrectly applied in the implementation. I didn't test the engine directly but I wrote my own version of quaternions and tested that.

The correct implementation would probably look something like this:

return (2*(quat.w*quat.w)- 1.0f)vec + 2.0f(dot(quat.r, vec)quat.r + quat.wcross(quat.r, vec));

This version worked for me

Hello!
I tried to compile and run demo project, but I only get a black window when running it.

How to fix?

Windows 7, 64-bit
Geforce GTX 1080
nVidia drivers 385.69

Demo dump:

INIT: Initializing GLFW
INIT: GLFW initialized
INIT: Initializing render system
INIT: OpenGL functions succesfully loaded.
INIT: Version - Major: 4 Minor: 3
INIT: Driver: NVIDIA Corporation Renderer: GeForce GTX 1080/PCIe/SSE2
INIT: Initializing debug Output.
INIT: Debug output initialized.
ERROR: Fragment shader compilation error at: post process!
0(41) : error C7011: implicit cast from "int" to "bool"
0(56) : error C7011: implicit cast from "int" to "bool"
0(69) : error C7011: implicit cast from "int" to "bool"
0(84) : error C7011: implicit cast from "int" to "bool"
0(88) : error C7011: implicit cast from "int" to "bool"

ERROR: Shader program linking error:
Fragment info

0(41) : error C7011: implicit cast from "int" to "bool"
0(56) : error C7011: implicit cast from "int" to "bool"
0(69) : error C7011: implicit cast from "int" to "bool"
0(84) : error C7011: implicit cast from "int" to "bool"
0(88) : error C7011: implicit cast from "int" to "bool"
(0) : error C2003: incompatible options for link

ERROR: Vertex shader compilation error at: default!
0(53) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(53) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Shader program linking error:
Vertex info

0(53) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(53) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

INIT: Loading texture file at: textures/checkerboard.png.
INIT: Succesfully loaded: textures/checkerboard.png.
INIT: Loading texture file at: textures/norm.png.
INIT: Succesfully loaded: textures/norm.png.
INIT: Loading texture file at: textures/black.png.
INIT: Succesfully loaded: textures/black.png.
INIT: Loading texture file at: textures/checkerboard.png.
INIT: Succesfully loaded: textures/checkerboard.png.
ERROR: Vertex shader compilation error at: glass!
0(50) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(50) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Fragment shader compilation error at: glass!
0(91) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(91) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Shader program linking error:
Vertex info

0(50) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(50) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

Fragment info

0(91) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(91) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

INIT: Loading texture file at: textures/glass.png.
INIT: Succesfully loaded: textures/glass.png.
INIT: Loading texture file at: textures/pbr/plastic/normal.png.
INIT: Succesfully loaded: textures/pbr/plastic/normal.png.
INIT: Loading texture file at: textures/pbr/plastic/metallic.png.
INIT: Succesfully loaded: textures/pbr/plastic/metallic.png.
INIT: Loading texture file at: textures/pbr/plastic/roughness.png.
INIT: Succesfully loaded: textures/pbr/plastic/roughness.png.
INIT: Loading texture file at: textures/pbr/plastic/ao.png.
INIT: Succesfully loaded: textures/pbr/plastic/ao.png.
ERROR: Vertex shader compilation error at: alpha blend!
0(50) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(50) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Fragment shader compilation error at: alpha blend!
0(91) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(91) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Shader program linking error:
Vertex info

0(50) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(50) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

Fragment info

0(91) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(91) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

ERROR: Vertex shader compilation error at: alpha discard!
0(50) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(50) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Fragment shader compilation error at: alpha discard!
0(91) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(91) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Shader program linking error:
Vertex info

0(50) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(50) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

Fragment info

0(91) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(91) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

ERROR: Vertex shader compilation error at: deferred ambient!
0(46) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(46) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Fragment shader compilation error at: deferred ambient!
0(219) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(219) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Shader program linking error:
Vertex info

0(46) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(46) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

Fragment info

0(219) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(219) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

ERROR: Vertex shader compilation error at: deferred directional!
0(46) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(46) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Fragment shader compilation error at: deferred directional!
0(163) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(163) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Shader program linking error:
Vertex info

0(46) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(46) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

Fragment info

0(163) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(163) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

ERROR: Vertex shader compilation error at: deferred point!
0(46) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(46) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Fragment shader compilation error at: deferred point!
0(122) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(122) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Shader program linking error:
Vertex info

0(46) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(46) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

Fragment info

0(122) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(122) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

ERROR: Vertex shader compilation error at: debug light!
0(43) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(43) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Shader program linking error:
Vertex info

0(43) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(43) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

ERROR: Fragment shader compilation error at: pbr:capture!
0(48) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(48) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Shader program linking error:
Fragment info

0(48) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(48) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

INIT: Render system initialized
ERROR: Vertex shader compilation error at: plasma orb!
0(49) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(49) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Fragment shader compilation error at: plasma orb!
0(47) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(47) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Shader program linking error:
Vertex info

0(49) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(49) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

Fragment info

0(47) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(47) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

INIT: Loading texture file at: textures/perlin.png.
INIT: Succesfully loaded: textures/perlin.png.
ERROR: Vertex shader compilation error at: background!
0(43) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(43) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable

ERROR: Shader program linking error:
Vertex info

0(43) : error C7532: layout qualifier 'binding' requires "#version 420" or later
0(43) : error C0000: ... or #extension GL_ARB_shading_language_420pack : enable
(0) : error C2003: incompatible options for link

INIT: Loading mesh file at: meshes/sponza/sponza.obj.
INIT: Succesfully loaded: meshes/sponza/sponza.obj.
INIT: Loading texture file at: meshes/sponza/textures\sponza_thorn_diff.tga.
INIT: Succesfully loaded: meshes/sponza/textures\sponza_thorn_diff.tga.
INIT: Loading texture file at: meshes/sponza/textures\vase_plant.tga.
INIT: Succesfully loaded: meshes/sponza/textures\vase_plant.tga.
INIT: Loading texture file at: meshes/sponza/textures\vase_round.tga.
INIT: Succesfully loaded: meshes/sponza/textures\vase_round.tga.
INIT: Loading texture file at: meshes/sponza/textures\background.tga.
INIT: Succesfully loaded: meshes/sponza/textures\background.tga.
INIT: Loading texture file at: meshes/sponza/textures\gi_flag.tga.
WARNING: Texture failed to load at path: meshes/sponza/textures\gi_flag.tga
INIT: Succesfully loaded: meshes/sponza/textures\gi_flag.tga.
INIT: Loading texture file at: meshes/sponza/textures\gi_flag.tga.
WARNING: Texture failed to load at path: meshes/sponza/textures\gi_flag.tga
INIT: Succesfully loaded: meshes/sponza/textures\gi_flag.tga.
INIT: Loading texture file at: meshes/sponza/textures\spnza_bricks_a_diff.tga.
INIT: Succesfully loaded: meshes/sponza/textures\spnza_bricks_a_diff.tga.
INIT: Loading texture file at: meshes/sponza/textures\sponza_arch_diff.tga.
INIT: Succesfully loaded: meshes/sponza/textures\sponza_arch_diff.tga.
INIT: Loading texture file at: meshes/sponza/textures\sponza_ceiling_a_diff.tga.
INIT: Succesfully loaded: meshes/sponza/textures\sponza_ceiling_a_diff.tga.
INIT: Loading texture file at: meshes/sponza/textures\sponza_column_a_diff.tga.
INIT: Succesfully loaded: meshes/sponza/textures\sponza_column_a_diff.tga.
INIT: Loading texture file at: meshes/sponza/textures\sponza_floor_a_diff.tga.
INIT: Succesfully loaded: meshes/sponza/textures\sponza_floor_a_diff.tga.
INIT: Loading texture file at: meshes/sponza/textures\sponza_column_c_diff.tga.
INIT: Succesfully loaded: meshes/sponza/textures\sponza_column_c_diff.tga.
INIT: Loading texture file at: meshes/sponza/textures\sponza_details_diff.tga.
INIT: Succesfully loaded: meshes/sponza/textures\sponza_details_diff.tga.
INIT: Loading texture file at: meshes/sponza/textures\sponza_column_b_diff.tga.
INIT: Succesfully loaded: meshes/sponza/textures\sponza_column_b_diff.tga.
INIT: Loading texture file at: meshes/sponza/textures\sponza_flagpole_diff.tga.
INIT: Succesfully loaded: meshes/sponza/textures\sponza_flagpole_diff.tga.
INIT: Loading texture file at: meshes/sponza/textures\sponza_fabric_green_diff.tga.
INIT: Succesfully loaded: meshes/sponza/textures\sponza_fabric_green_diff.tga.
INIT: Loading texture file at: meshes/sponza/textures\sponza_fabric_blue_diff.tga.
INIT: Succesfully loaded: meshes/sponza/textures\sponza_fabric_blue_diff.tga.
INIT: Loading texture file at: meshes/sponza/textures\sponza_fabric_diff.tga.
INIT: Succesfully loaded: meshes/sponza/textures\sponza_fabric_diff.tga.
INIT: Loading texture file at: meshes/sponza/textures\sponza_curtain_blue_diff.tga.
INIT: Succesfully loaded: meshes/sponza/textures\sponza_curtain_blue_diff.tga.

Hello,

I noticed that this project is licensed under CC BY-NC 4.0. However, this license does not follow the Free Software Definition and the Open Source Definition, as it prohibits commercial use. Creative Commons also doesn't recommend its usage on software.

Would you please consider switching to a license such as MIT?