slang-shaders/bezel/Mega_Bezel/shaders/base/linearize-crt.inc

/*
    Mega Bezel - Creates a graphic treatment for the game play area to give a retro feel
    Copyright (C) 2019-2022 HyperspaceMadness - HyperspaceMadness@outlook.com

    Incorporates much great feedback from the libretro forum, and thanks 
    to Hunterk who helped me get started

    See more at the libretro forum
    https://forums.libretro.com/t/hsm-mega-bezel-reflection-shader-feedback-and-updates

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/
// HSM_REFLECT_SHOW_TUBE_FX_AMOUNT
#include "common/globals-and-reflection-params.inc"
#include "common/helper-functions.inc"

layout(push_constant) uniform Push
{
	vec4 SourceSize;
	vec4 OriginalSize;
	vec4 OutputSize;
	uint FrameCount;
} params;

#include "../../../../include/compat_macros.inc"

#pragma stage vertex
layout(location = 0) in vec4 Position;
layout(location = 1) in vec2 TexCoord;
layout(location = 0) out vec2 vTexCoord;
layout(location = 1) out vec2 blur_dxdy;

void main()
{
	gl_Position = global.MVP * Position;
	vTexCoord = TexCoord;

	const vec2 dxdy_scale = global.SourceSize.xy * global.OutputSize.zw;
	blur_dxdy = dxdy_scale * global.SourceSize.zw;
}

#pragma stage fragment
layout(location = 0) in vec2 vTexCoord;
layout(location = 1) in vec2 blur_dxdy;
layout(location = 0) out vec4 FragColor;
layout(set = 0, binding = 2) uniform sampler2D CRTPass;
layout(set = 0, binding = 3) uniform sampler2D PostCRTPass;

#include "../../../../include/blur-functions.h"

void main()
{
    // FragColor = vec4(tex2Dblur9x9(PostCRTPass, vTexCoord, blur_dxdy), 1);
    // In the HDR preset sampling from the PostCRTPass results in sort of colorful garbabe
    // Grabbing from the CRTPass instead
#ifdef IS_HDR_PRESET
    FragColor = textureLod(CRTPass, vTexCoord, 2);
    FragColor = HSM_ApplyGamma(FragColor, DEFAULT_SRGB_GAMMA);
#else
    vec4 crt_rgba = textureLod(CRTPass, vTexCoord, 2);
    vec4 post_crt_rgba = textureLod(PostCRTPass, vTexCoord, 2);
    FragColor = mix(crt_rgba, post_crt_rgba, HSM_REFLECT_SHOW_TUBE_FX_AMOUNT);
#endif

    FragColor = HSM_ApplyGamma(FragColor, DEFAULT_SRGB_GAMMA/DEFAULT_CRT_GAMMA - 0.05);
    FragColor = clamp(FragColor, 0, 1);
}