slang-shaders/handheld/shaders/ds-hybrid-view.slang

#version 450

//	DS Hybrid View
//	by hunterk
//	license: public domain
//
//	This shader requires 16:9 aspect ratio
//	and integer scaling OFF

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

#pragma parameter screen_toggle "Screen Toggle" 0.0 0.0 0.5 0.5
#pragma parameter aspect_correction "Aspect Correction" 1.0 0.5 5.0 0.01
#pragma parameter filter_small "Filter Small Screen" 1.0 0.0 1.0 1.0

layout(std140, set = 0, binding = 0) uniform UBO
{
	mat4 MVP;
} global;

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

void main()
{
	vec2 video_scale = floor(params.SourceSize.zw * params.OutputSize.xy);
	vec2 integer_scale = video_scale * params.SourceSize.xy;
	gl_Position = (global.MVP * Position);
	vTexCoord = TexCoord * 1.00001;
	vTexCoord *= vec2(1.333,0.5);
}

#pragma stage fragment
layout(location = 0) in vec2 vTexCoord;
layout(location = 1) in float video_scale;
layout(location = 0) out vec4 FragColor;
layout(set = 0, binding = 2) uniform sampler2D Original;
layout(set = 0, binding = 3) uniform sampler2D Source;

void main()
{
	vec2 bigCoord = vTexCoord + vec2(0., 0. + params.screen_toggle);
	vec2 smallCoord = vTexCoord * vec2(3.) + vec2(-3., 0.);
	FragColor = texture(Source, bigCoord);
	FragColor += (params.filter_small > 0.5) ? texture(Source, smallCoord) : texture(Original, smallCoord);
}