slang-shaders/border/shaders/imgborder.inc

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2016-10-22 07:18:07 +11:00
// Image Border shader by hunterk
// license: public domain
layout(push_constant) uniform Push
{
vec4 OutputSize;
vec4 OriginalSize;
vec4 SourceSize;
uint FrameCount;
float box_scale;
float location_x;
float location_y;
float in_res_x;
float in_res_y;
float border_on_top;
float border_zoom_x;
float border_zoom_y;
float OS_MASK_TOP;
float OS_MASK_BOTTOM;
float OS_MASK_LEFT;
float OS_MASK_RIGHT;
} params;
#pragma parameter OS_MASK_TOP "OS Mask Top" 0.0 0.0 1.0 0.01
#pragma parameter OS_MASK_BOTTOM "OS Mask Bottom" 0.0 0.0 1.0 0.01
#pragma parameter OS_MASK_LEFT "OS Mask Left" 0.0 0.0 1.0 0.01
#pragma parameter OS_MASK_RIGHT "OS Mask Right" 0.0 0.0 1.0 0.01
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;
layout(location = 1) out vec2 screen_coord;
void main()
{
gl_Position = global.MVP * Position;
vec2 corrected_size = vec2(params.in_res_x, params.in_res_y);
vec2 scale = (params.OutputSize.xy / corrected_size) / params.box_scale;
vec2 middle = vec2(params.location_x, params.location_y);
vec2 diff = TexCoord.xy - middle;
screen_coord = middle + diff * scale;
middle = vec2(0.4999, 0.4999);
vTexCoord = middle + diff * vec2(params.border_zoom_x, params.border_zoom_y);
}
#pragma stage fragment
layout(location = 0) in vec2 vTexCoord;
layout(location = 1) in vec2 screen_coord;
layout(location = 0) out vec4 FragColor;
layout(set = 0, binding = 2) uniform sampler2D Source;
layout(set = 0, binding = 3) uniform sampler2D Original;
layout(set = 0, binding = 4) uniform sampler2D BORDER;
void main()
{
vec4 screen = texture(Source, screen_coord); //the main video screen
vec4 background = vec4(texture(BORDER, vTexCoord)); //put your background function's output here
if ( screen_coord.x < 0.9999 - params.OS_MASK_RIGHT && screen_coord.x > 0.0001 + params.OS_MASK_LEFT && screen_coord.y < 0.9999 - params.OS_MASK_BOTTOM && screen_coord.y > 0.0001 + params.OS_MASK_TOP && params.border_on_top > 0.5 )
background.a *= 0.0;
FragColor = vec4(mix(screen, background, background.a));
}