92 lines
2.2 KiB
GLSL
92 lines
2.2 KiB
GLSL
#version 450
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layout(location = 0) in vec2 uv;
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layout(location = 0) out vec4 out_color;
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layout(set = 2, binding = 0) uniform sampler2D screen;
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layout(std140, set = 3, binding = 0) uniform UniformBlock {
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mat4 model;
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mat4 view;
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mat4 proj;
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mat4 inv_view;
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mat4 inv_proj;
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vec4 cam_pos;
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float time;
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int post_mode;
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vec2 atlas_adjust;
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};
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float t(float x, float y) { return length(texture(screen, vec2(x, y)).xyz); }
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mat3 neighborhood() {
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vec2 d = 1.0 / vec2(textureSize(screen, 0));
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return mat3(t(uv.x - d.x, uv.y - d.y), t(uv.x + 0.0, uv.y - d.y),
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t(uv.x + d.x, uv.y - d.y), t(uv.x - d.x, uv.y - 0.0),
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t(uv.x + 0.0, uv.y + 0.0), t(uv.x + d.x, uv.y - 0.0),
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t(uv.x - d.x, uv.y + d.y), t(uv.x + 0.0, uv.y + d.y),
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t(uv.x + d.x, uv.y + d.y));
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}
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float sum3(mat3 m) {
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float s = 0.0;
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for (int c = 0; c < 3; ++c) {
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vec3 col = m[c];
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s += col.x + col.y + col.z;
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}
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return s;
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}
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float f(mat3 kernel) {
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return abs(sum3(matrixCompMult(kernel, neighborhood())));
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}
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float brightness(vec3 color) {
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return dot(color, vec3(0.299, 0.587, 0.114));
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}
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float dither() {
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if(length(texture(screen, uv).xyz) == 0.0)
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return 0.0;
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vec2 coord = uv * textureSize(screen, 0).xy;
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int x = int(mod(coord.x, 4.0));
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int y = int(mod(coord.y, 4.0));
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int index = x + y * 4;
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float threshold[16] = float[](
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0.0/16.0, 8.0/16.0, 2.0/16.0, 10.0/16.0,
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12.0/16.0, 4.0/16.0, 14.0/16.0, 6.0/16.0,
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3.0/16.0, 11.0/16.0, 1.0/16.0, 9.0/16.0,
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15.0/16.0,7.0/16.0, 13.0/16.0, 5.0/16.0
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);
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vec3 color = texture(screen, uv).rgb;
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return brightness(color) < threshold[index] ? 0.0 : 1.0;
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}
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void main() {
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const mat3 sobelx = mat3(-1.0, -2.0, -1.0, 0.0, 0.0, 0.0, 1.0, 2.0, 1.0);
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const mat3 sobely = mat3(-1.0, 0.0, 1.0, -2.0, 0.0, 2.0, -1.0, 0.0, 1.0);
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switch(post_mode) {
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case 0:
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out_color = texture(screen, uv);
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break;
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case 1:
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out_color = vec4(brightness(texture(screen, uv).xyz) < 0.5? 0.0 : 1.0);
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break;
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case 2:
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out_color = vec4(dither());
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break;
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}
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return;
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out_color = out_color * 0.9 +
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0.1*((t(uv.x, uv.y) > 0.01)?
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vec4(abs(f(sobelx) + f(sobely))) : vec4(0.0));
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}
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