Pete`s Messageboard Forum - OGL2 shaders

I created this shader mearly for myself, its a combination of a scale2x shader and my own bloom code that i use often in my own coding projects, essentially i use it when playing sprite based rpg games, scale2x for nicer scaling and bloom to make the 'effects' slightly more impressive.
you can modify the sharpness and brightness defines to tweek the bloom (playstation seems to be easliy 'washed out' by bloom, brightness controls how much the bloomed areas effect the screen and sharpness controls the difference between the parts of the image that are bloomed and the parts that are not).

the scale2x is borrowed from something (i can't remember what, but its gpl'ed), i only use scale2x beacuse i generally play psx games on a television.

screenies (first with, then without bloom/scale):

and the code:
.slf

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uniform vec4 OGL2Param;
uniform vec4 OGL2Size;
uniform sampler2D OGL2Texture;

#define SIGMOIDAL_BASE 2.0

#define SIGMOIDAL_RANGE 20.0

// the sharpness of the difference between bright and dark colours
#define sharpness 0.85

// the brightness of the resulting 'bloom'
#define brightness 0.6

void main()

{

vec4 colD,colF,colB,colH,col,tmp;

vec2 sel;



col = texture2DProj(OGL2Texture, gl_TexCoord[0]); // central (can be E0-E3)

colD = texture2DProj(OGL2Texture, gl_TexCoord[1]); // D (left)

colF = texture2DProj(OGL2Texture, gl_TexCoord[2]); // F (right)

colB = texture2DProj(OGL2Texture, gl_TexCoord[3]); // B (top)

colH = texture2DProj(OGL2Texture, gl_TexCoord[4]); // H (bottom)



sel=fract(gl_TexCoord[0].xy * OGL2Size.xy); // where are we (E0-E3)?

// E0 is default

if(sel.y>=0.5) {tmp=colB;colB=colH;colH=tmp;} // E1 (or E3): swap B and H

if(sel.x>=0.5) {tmp=colF;colF=colD;colD=tmp;} // E2 (or E3): swap D and F



if(colB == colD && colB != colF && colD!=colH) // do the Scale2x rule

col=colD;


//bloom stuff
vec4 blurcolor = (((colD + colF + colB + colH) * 0.25) + col) * 0.5;

//contrast stretch
//blurcolor = (blurcolor - 0.5) * 8.0 + 0.5;
vec4 val = 1.0 / (1.0 + exp (-(SIGMOIDAL_BASE + (sharpness * SIGMOIDAL_RANGE)) * (blurcolor - 0.5)));

val = val * brightness;

gl_FragColor = 1.0 - ((1.0 - col) * (1.0 - val));



}

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uniform vec4 OGL2Param;
uniform vec4 OGL2Size;

void main()

{

vec4 offsetx;

vec4 offsety;



gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;



offsetx.x = OGL2Param.x; // setup one x/y texel offset

offsetx.y = 0.0; // we could also use "1.0/OGL2Size.x (y)", than it wouldn't

offsetx.w = 0.0; // be dependand on the "shader effect level" setting...

offsetx.z = 0.0; // but more choice is usual better, eh?

offsety.y = OGL2Param.y;

offsety.x = 0.0;

offsety.w = 0.0;

offsety.z = 0.0;



gl_TexCoord[0] = gl_MultiTexCoord0; // center

gl_TexCoord[1] = gl_TexCoord[0] - offsetx; // left

gl_TexCoord[2] = gl_TexCoord[0] + offsetx; // right

gl_TexCoord[3] = gl_TexCoord[0] - offsety; // top

gl_TexCoord[4] = gl_TexCoord[0] + offsety; // bottom

}

Similarly threads:
Topics	Created by	Replies	Boardname
Scale2x ARB Program	ShadX	0	pete_bernert
New scale2x ARB program	ShadX	5	pete_bernert
Scale2x Plus GLSL shader	guest	0	pete_bernert
Dark Bloom vs Normale Bloom	Bloom	4	yumi_
Bloom	Preiti_Zinta	-1	preiti_zinta

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scale2x + bloom

scale2x + bloom