Share a Shader!

[retrotails]

While I'm here...

I want to do a 360 ° view using a panorama image. To fake a perspective I want to use a inverted fisheye effect. The goal is a game like Myst with 360 ° environment. Or is there a better way to fake some kind of perspective?

http://99.30.162.147/static/code/fisheye.love
Is this what you were looking for?

Anyway, on to why I'm posting here.

Sorry, the board attachment quota has been reached.

http://99.30.162.147/static/code/tetris.love
I plan on making a fancy looking Tetris clone with refractive peices and Oculus Rift support.
It uses my totally-inaccurate-but-that's-okay-because-it-still-looks-neat normal map shader.

[josefnpat]

I'm very new to shaders, but I did manage to squeeze one out.

While the shader is not very complicated, it comes with a module that should do a lot of stuff to emulate the DMG-01 style.

ozLGjZs.gif (288.49 KiB) Viewed 1028 times

To make this shader work correctly, it requires a;

Code: Select all

shader:send('COLOR_MASKS',color1,color2,color3,color4)

(example in context)

I went and abstracted a bunch of color palettes (seven in total) for the DMG-01, and you can see them in action here.

And here's the shader. It is implemented here:
https://github.com/josefnpat/DMGake/blo ... 1.lua#L105

Code: Select all

extern number value;

uniform vec3 COLOR_MASKS[ 4 ];

vec4 effect(vec4 color, Image texture, vec2 texture_coords, vec2 pixel_coords){
                        vec4 pixel = Texel(texture, texture_coords);
                        float avg = min(0.9999,max(0.0001,(pixel.r + pixel.g + pixel.b)/3));
                        int index = int(avg*4);

                        pixel.r = COLOR_MASKS[index][0];
                        pixel.g = COLOR_MASKS[index][1];
                        pixel.b = COLOR_MASKS[index][2];

                        return  pixel;
                }

https://github.com/josefnpat/DMGake

Here's a .love of the example project:

H for Help
LEFT/RIGHT for palette change
UP/DOWN for scale change
RETURN to see the image move

[gim]

Bumping old thread.

I've ported my old plasma code. It's based on vrld metaballs code, formula is bit different (and heavier due to sqrt).

's' will switch palette to some ugly one.

bkXKvpH.png (299.42 KiB) Viewed 1026 times

[Ref]

Thought we were bored with this.
Oh, well!
More nonsense.

[Davidobot]

Here is the other way shown in the video

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const number pi = 3.14159265;
const number pi2 = 2.0 * pi;

extern number time;
		
vec4 effect(vec4 color, Image texture, vec2 tc, vec2 pixel_coords)
{
	vec2 p = 2.0 * (tc - 0.5);
	
	number r = sqrt(p.x*p.x + p.y*p.y);

	if (r > 1.0) discard;
	
	number d = r != 0.0 ? asin(r) / r : 0.0;
				
	vec2 p2 = d * p;
	
	number x3 = mod(p2.x / (pi2) + 0.5 + time, 1.0);
	number y3 = p2.y / (pi2) + 0.5;
	
	vec2 newCoord = vec2(x3, y3);
	
	vec4 sphereColor = color * Texel(texture, newCoord);
				
	return sphereColor;
}

First off, really sorry for replying to an old thread.
Secondly, I can not, for the love of me, work out how to use this shader properly, the image doens't spin!

Controls for the .love file:
Z - Toggle Shader
Space - Generate new planet

[Ref]

I can not, for the love of me, work out how to use this shader properly, the image doens't spin!

I love these types of questions.
They almost make me fell like I know what I'm talking about.
Try adding this:

Code: Select all

function love.update(dt)
   tm  = tm + dt
   sphere:send( 'time', tm )
end

(don't forget to add tm = 0 in love.load )
If you don't update anything, nothing will change.
Best

[Davidobot]

If you don't update anything, nothing will change.

Thank you, kind sir!

[qwook]

Left 4 Dead style glow

Code: Select all

local glow_effect = love.graphics.newShader([[
extern vec2 size;

vec2 clamp(vec2 pos) {
    number x = pos.x;
    number y = pos.y;
    if (x < 0.0) x = 0.0;
    if (y < 0.0) y = 0.0;
    if (x > 1.0) x = 1.0;
    if (y > 1.0) y = 1.0;
    return vec2(x, y);
}

vec4 effect ( vec4 color, Image texture, vec2 texture_coords, vec2 screen_coords ) {
    number distance = 1.0;
    number num = 0.0;
    vec4 averagecolor = vec4(0.0, 0.0, 0.0, 0.0);
    for (number x = -6.0 ; x <= 6.0; x++)
    for (number y = -6.0 ; y <= 6.0; y++) {
        vec4 color = Texel(texture, clamp(vec2(texture_coords.x + x/size.x, texture_coords.y + y/size.y)));
        if (color.a > 0.0) {
            num = num + 1.0;
            averagecolor.r = (averagecolor.r + color.r);
            averagecolor.g = (averagecolor.g + color.g);
            averagecolor.b = (averagecolor.b + color.b);
            averagecolor.a = (averagecolor.a + color.a);
            number x1 = x/size.x;
            number y1 = y/size.y;
            number dist = sqrt( x1*x1 + y1*y1 ) * 200;
            if (dist < distance) {
                distance = dist;
            }
        }
    }
    return vec4(averagecolor.r / num, averagecolor.g / num, averagecolor.b / num, averagecolor.a / num - distance);
}
]])

Can probably be simplified with a hard-coded color, but this way you can set the glow color to anything you want without having to use multiple framebuffers. I used a framebuffer here instead of rendering each individual sprite under the effect.

[Ranguna259]

Can anyone make me this shader ? Motion blur effect or per pixel motion blur or per object motion blur, whichever strikes you guys best.

[styves]

Per-pixel motion blur is on my todo-list.