OpenB3D ASCII Art

Started by angros47, April 13, 2024, 00:36:31

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angros47

April 13, 2024, 00:36:31
I tried to port https://www.shadertoy.com/view/lssGDj to OpenB3D:

vertex shader:
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#version 130

varying vec3 Position;
varying vec2 TexCoord;


void main()
{
TexCoord = gl_MultiTexCoord0.st;
gl_Position = ftransform();
}
Frag shader:
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// Port of Bitmap to ASCII (not really) fragment shader by movAX13h, September 2013

#version 130
uniform sampler2D tex0;

varying vec2 TexCoord;
uniform vec2 screen;
uniform int fullset;
uniform int bw;


float character(int n, vec2 p)
{
p = floor(p*vec2(-4.0, 4.0) + 2.5);
    if (clamp(p.x, 0.0, 4.0) == p.x)
{
        if (clamp(p.y, 0.0, 4.0) == p.y)
{
        int a = int(round(p.x) + 5.0 * round(p.y));
if (((n >> a) & 1) == 1) return 1.0;
}
    }
return 0.0;
}


void main(){

vec2 pix = TexCoord*screen;
vec3 col = texture2D(tex0, floor(pix/8.0)*8.0/screen).rgb;
float gray = 0.3 * col.r + 0.59 * col.g + 0.11 * col.b;

int n =  4096;

if (fullset==0){   
// limited character set
if (gray > 0.2) n = 65600;    // :
if (gray > 0.3) n = 163153;   // *
if (gray > 0.4) n = 15255086; // o
if (gray > 0.5) n = 13121101; // &
if (gray > 0.6) n = 15252014; // 8
if (gray > 0.7) n = 13195790; // @
if (gray > 0.8) n = 11512810; // #
}else{
// full character set including A-Z and 0-9
if (gray > 0.0233) n = 4096;
if (gray > 0.0465) n = 131200;
if (gray > 0.0698) n = 4329476;
if (gray > 0.0930) n = 459200;
if (gray > 0.1163) n = 4591748;
if (gray > 0.1395) n = 12652620;
if (gray > 0.1628) n = 14749828;
if (gray > 0.1860) n = 18393220;
if (gray > 0.2093) n = 15239300;
if (gray > 0.2326) n = 17318431;
if (gray > 0.2558) n = 32641156;
if (gray > 0.2791) n = 18393412;
if (gray > 0.3023) n = 18157905;
if (gray > 0.3256) n = 17463428;
if (gray > 0.3488) n = 14954572;
if (gray > 0.3721) n = 13177118;
if (gray > 0.3953) n = 6566222;
if (gray > 0.4186) n = 16269839;
if (gray > 0.4419) n = 18444881;
if (gray > 0.4651) n = 18400814;
if (gray > 0.4884) n = 33061392;
if (gray > 0.5116) n = 15255086;
if (gray > 0.5349) n = 32045584;
if (gray > 0.5581) n = 18405034;
if (gray > 0.5814) n = 15022158;
if (gray > 0.6047) n = 15018318;
if (gray > 0.6279) n = 16272942;
if (gray > 0.6512) n = 18415153;
if (gray > 0.6744) n = 32641183;
if (gray > 0.6977) n = 32540207;
if (gray > 0.7209) n = 18732593;
if (gray > 0.7442) n = 18667121;
if (gray > 0.7674) n = 16267326;
if (gray > 0.7907) n = 32575775;
if (gray > 0.8140) n = 15022414;
if (gray > 0.8372) n = 15255537;
if (gray > 0.8605) n = 32032318;
if (gray > 0.8837) n = 32045617;
if (gray > 0.9070) n = 33081316;
if (gray > 0.9302) n = 32045630;
if (gray > 0.9535) n = 33061407;
if (gray > 0.9767) n = 11512810;
}


vec2 p = mod(pix/4.0, 2.0) - vec2(1.0);

if (bw==1)
col = vec3(character(n, p));
else
col = col*character(n, p);
gl_FragColor = vec4(col,1.0);
}

It can be enabled with something like:
Code Select
asciishader=LoadShader("ASCII", "ascii.vert", "ascii.frag")
asciiart=CreatePostFX(camera,1)
AddRenderTarget(asciiart,0,1,0,8,1.0)
PostFXBuffer(asciiart,0,0,1,0)
PostFXShader(asciiart,0,asciishader)
SetFloat2(asciishader, "screen", 640,480)
HideEntity(camera)
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