panchokoster / emulator-shaders Goto Github PK

Problem:
The current LCD3x is too saturated and bright for GBA games.
-----------------
Solution:
Change filter coeffs, decrase saturation and add contrast.

------------------
changed filter coeffs (half of current values):

const float brighten_scanlines = 8.0;
const float brighten_lcd = 2.0;

-------------------
changed main function:

void main() {
vec2 angle = vTexCoord * omega;

float yfactor = (brighten_scanlines + sin(angle.y)) / (brighten_scanlines + 
1.0);
vec3 xfactors = (brighten_lcd + sin(angle.x + offsets)) / (brighten_lcd + 1.0);

const vec3 coef = vec3(0.299, 0.587, 0.114);
vec4 color = texture2D(rubyTexture, vTexCoord);
color = ((color-0.5)*1.1+0.5); /* adjust contrast to +10% */
vec3 gray = vec3(dot(color.rgb, coef));

gl_FragColor.rgb = yfactor * xfactors * vec3(mix(color.rgb, gray, 0.35)); /* 
-35% saturation*/
}

---------------

Note:
Result may be different on every device. I compared side by side my NDS and my 
phone (Huawei Ascend P6) running MyBoy emulator and the colors match 
subjectively 95% with this change.

I've completed a shader implementation of HQx available here: 
https://github.com/Armada651/hqx-shader

I've not yet implemented a GLSL version, because the shader requires the 
following functionality:

* Passing additional textures to the shader.
* Applying multiply shaders to the output for better performance. (optional)

Could you add this functionality? I can provide a GLSL version if necessary, 
the shader code itself is pretty simple.

Attached you'll find a screenshot of the HQ4x shader running in RetroArch, 
they've included it in their common shaders repository.

I've ported some of the xBR GLSL shaders to OpenGL ES and added them to the 
shader pack.

Unfortunately performance on my Nexus 7 is too low currently.

The filters currently named HQx4 and HQx2 are easily confused with the original 
HQx filters developed by Maxim Stepin. You can also see in the comment headers 
that they're actually named very differently.

The filters currently named HQx4 and HQx2 were originally developed for 
Playstation emulators and only do upscaling without any of the complex rule 
sets used in the original HQx filters.

Originally these filters were developed as a higher quality version of the 
2xScale and 4xScale shaders, so I suggest renaming them to 2xScaleHQ and 
4xScaleHQ to make the situation less confusing.

The shaders were originally part of this package: 
https://www.dropbox.com/s/o2r0z95fhhea52c/epsxe_Shaders.7z

What steps will reproduce the problem?
1. Load Minish cap in MyBoy
2. Go to Video GLSL Shader settings
3. Select HQ2x

What is the expected output? What do you see instead?
Some areas of color were wacky. This doesn't happen with HQ4x.

What version of the product are you using? On what operating system?
Android 4.1.2 Samsung Note 10.1 
MyBoy and Shaders released on May 20, 2014

Please provide any additional information below.
See sample screen caps for reference.