Bloom Shader test

[Rbz]

I'm slowly learning GLSL language, today I've finished a bloom/glow effect test, the shader code itself it's not mine (can't remember the autor ) but I can fully understand how it works on the glsl pipeline and how I can use it with my framework. I just not sure if it will work on other graphics card.

Requirements:
d3dx9_32.dll  -> to load png files (Thx Jim for that).
Pixel Shader 2.0

Use keys "1 to 6" to change texture and key "S" to enable/disable shader program.

[taj]

Rbraz,

I have d3dx9_32.dll but all I get is a black screen. I guess the shader is Nvidia specific right now as Im running on a x600 ati, drivers from feb 2008.

Tried it on x1950 too - still just a black screen, no images or shader.

Taj

[zawran]

It works fine with nvidia 8800gt cards.

[Jim]

About 6fps on my 8600GT, with or without the shader!
Jim

[Shockwave]

The only thing that did anything here was 6 and that displayed an orange cube, S key didnt change anything.

I have an ATI card (X1650)

[Rbz]

About 6fps on my 8600GT, with or without the shader!
Jim

OMG Jim  , only 6 fps, it run at fixed 60fps here on my old 6600GT, and I just use a trivial "glCopyTexImage2D" to copy textures, apply shader prog to texture and display it 

The only thing that did anything here was 6 and that displayed an orange cube, S key didnt change anything.

I have an ATI card (X1650)

There's bug for ATI cards in that shader code...

...
Tried it on x1950 too - still just a black screen, no images or shader.

Taj

Can you help me to fix it for ATI, check the code below.

Code: [Select]

char *vert="\
void main()\
{\
gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;\
gl_TexCoord[0]  = gl_MultiTexCoord0;\
}";

char *frag="\
uniform sampler2D bgl_RenderedTexture;\
float samples[] ={\
0.0222244,0.0378346,0.0755906,0.1309775,0.1756663,\
0.1974126,\
0.1756663,0.1309775,0.0755906,0.0378346,0.0222244\
};\
void main()\
{\
vec4 sum = vec4(0);\
vec2 texcoord = vec2(gl_TexCoord[0]);\
int j;\
int i;\
for( i= -5 ;i < 5; i++)\
{\
for( j= -5 ;j < 5; j++)\
{\
sum += texture2D(bgl_RenderedTexture, texcoord + vec2(j, i)*0.004) * samples[j+5];\
}\
}\
gl_FragColor = clamp(sum*sum*0.04 + texture2D(bgl_RenderedTexture, texcoord),0.0,1.0);\
}";

[taj]

Rbraz,

in order to help fix this the whole code would be much easier, otherwsie I have to go and write quite a bit of c code around it.

Taj

[taj]

On second thoughts, debugging by eye - so highly unlikely to be right but the line

Code: [Select]

gl_FragColor = clamp(sum*sum*0.04 + texture2D(bgl_RenderedTexture, texcoord),0.0,1.0);\

looks unlikely to be right to me. How many components does your texture have? I guess 4 as you are loading PNGs, so this line would try to stuff 6 components into into a vec4 and fail I guess.

ATi drivers have always been less forgiving of type conversions than Nvidia ones.

[Rbz]

I have updated the archive, I was passing a non power of two texture to the shader program, it might fix slowdown for Jim.

@Taj: I did some changes in the shader code too, not sure if it will work, anyway I will send all code for you to check. Thanks for your help.

[Jim]

It's still incredibly slow, even on the orange cube.

Jim

[Rbz]

Hmm    Anyway, I will try to convert the "copy2texture" part using frame buffer object method and check if there's any performance change...

[taj]

Can you send an image of what it should look like - I just get a red (pink) circle. The shader doesnt seem to work so Im trying things but an image for final goal would be good.

[Rbz]

Ok, here one screenshot of that example test I sent to you.

[Voltage]

Hey rbraz,

Firstly, I love the bloom effect.  IMO the best looking one is number 4 (the granite-like texture).

On my NV GeForce 7300 GS, (full screen version), I get 30 FPS on all 6 with the shader active, and 45 FPS without.

[Rbz]

Thx Voltage


Due to my lack of experience using shader language and make it compatible everywhere, I took another direction and made this effect using only software, looks much nicer and more like what I was looking for.

The idea is to draw main scene, copy to an image buffer, blur that image buffer (vertically and horizontally), apply luminance, and display all scene.

Still, I need some tests   

(Run at fixed 60 fps here)

[zawran]

full 60 fps here, nvidia 8800gt in sli setup.

[Jim]

What would you say if I told you that this one (software) is actually showing what I think is a bloom effect - which the other isn't showing properly - I get no halo on the PS one - but that it is still 6fps? 

Jim

[Rbz]

Thx zawran

What would you say if I told you that this one (software) is actually showing what I think is a bloom effect - which the other isn't showing properly - I get no halo on the PS one - but that it is still 6fps? 

Jim

I agree, the PS version isn't working like I want, the software version is exactly what I need.

About speed, are you saying that this software version runs only at 6 fps on your PC You will give me a heart attack!

I've tested it on a notebook with bad ATI 915gm something and it run at 53 fps...

I'll wait for more feedback about speed ....

[ninogenio]

tested the software one on my old ti4600 rig and it runs smooth i would guess 50 - 60 fps,

looks really cool and gives the texture a prince of persia style of look.

[Voltage]

The software version does look lots better (more pronounced halo).

I get 47 FPS. (P4 3.00Ghz)

Looking really nice RbRaz.