[Feature Request] Glow bars...

[make-42]

Basically like the shadow effect but with colors and gradients...

[nikp123]

you can change the shadow color, which should achieve the same effect, though gradients are yet to be implemented

[make-42]

It sort of achieves it but I think a different spreading curve and having it be on both sides of the bars would make the glow more convincing

[make-42]

I made a demo with GLSL of what a glow effect could look like.

#ifdef GL_ES
precision mediump float;
#endif

#extension GL_OES_standard_derivatives : enable

uniform vec2 resolution;
uniform float time;

float rand(float n){return fract(sin(n) * 43758.5453123);}

float noise(float p){
	float fl = floor(p);
  float fc = fract(p);
	return mix(rand(fl), rand(fl + 1.0), fc);
}


void main( void ) {

	vec2 position = ( gl_FragCoord.xy / resolution.xy );
	float brightness=1.;
	float color = 0.0;
	float r = (position.y*0.843)+((1.-position.y)*0.243);
	float g = (position.y*0.)+((1.-position.y)*0.286);
	float b = (position.y*0.564)+((1.-position.y)*1.);
	float barheight = (noise(position.x+time))*(1.-position.y);
	color += ceil(sin(position.x*50.));
	color += exp(sin(position.x*50.)/brightness);
	color *= barheight;
	gl_FragColor = vec4( vec3( color*r, color*g,color*b),1);

}

http://glslsandbox.com/e#65127.5

[nikp123]

True, it's as convincing as I thought it would be.
Since shaders achieve a lot of functionality that pure code doesn't, I though of migrating the entire OGL renderer to be VBO based instead of 90s OGL, which would allow me to just cram in shaders. But I have no idea how to organize them, so that would be a major pain to do. Also this would resolve many workarounds that I've implemented simply due to default shaders being different on different drivers and OS-es. I think I have a demo working in VBO, so that would be a good starting point.

[nikp123]

The tree is 70 commits old, so it shouldn't be that hard to work with. Just updates are going to be slow since I'm busy atm.

https://github.com/nikp123/xava/tree/opengl-vbo

[nikp123]

Also since I'm kinda bad with OGL, can you link me to a resource where I could share local variables (in C code) with shader code.

[make-42]

Will do!

[make-42]

OpenGL Shading Language 4.5 Documentation: https://www.khronos.org/registry/OpenGL-Refpages/gl4/
IO GLSL code: https://gamedev.stackexchange.com/questions/29672/in-out-keywords-in-glsl

[make-42]

Improved the demo and edited my comment...

[make-42]

Hell yeah! Nice work!