55 lines
1.3 KiB
Plaintext
55 lines
1.3 KiB
Plaintext
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#version 450
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#extension GL_GOOGLE_include_directive : enable
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#include "lib/common.glsl"
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IN(0, vec2, texcoord)
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OUT(0, vec4, color)
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SAMPLER(0, input)
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SAMPLER(1, lut)
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#define MAXCOLOR 15.0
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#define COLORS 16.0
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#define WIDTH 256.0
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#define HEIGHT 16.0
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vec3 lookup_color(sampler2D lut, vec3 clr) {
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float cell = clr.b * MAXCOLOR;
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float cell_l = floor(cell);
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float cell_h = ceil(cell);
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float half_px_x = 0.5 / WIDTH;
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float half_px_y = 0.5 / HEIGHT;
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float r_offset = half_px_x + clr.r / COLORS * (MAXCOLOR / COLORS);
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float g_offset = half_px_y + clr.g * (MAXCOLOR / COLORS);
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vec2 lut_pos_l = vec2(cell_l / COLORS + r_offset, 1 - g_offset);
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vec2 lut_pos_h = vec2(cell_h / COLORS + r_offset, 1 - g_offset);
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vec3 graded_color_l = texture(lut, lut_pos_l).rgb;
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vec3 graded_color_h = texture(lut, lut_pos_h).rgb;
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return mix(graded_color_l, graded_color_h, fract(cell));
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}
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void main() {
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// todo: expose as uniform setting
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float exposure = 1.0;
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// get input color
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vec3 hdrColor = texture(tex_input, in_texcoord).rgb;
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// exposure tone mapping
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vec3 mapped = vec3(1.0) - exp(-hdrColor * exposure);
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// gamma correction
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vec3 corrected = pow(mapped, vec3(1/gamma));
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// color grading
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vec3 graded = lookup_color(tex_lut, corrected);
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// return
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out_color = vec4(graded, 1);
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}
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