Lubos Lenco
312 lines
9.8 KiB
GLSL
312 lines
9.8 KiB
GLSL
#version 450
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#define SMAA_MAX_SEARCH_STEPS_DIAG 8
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#define SMAA_AREATEX_MAX_DISTANCE 16
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#define SMAA_AREATEX_MAX_DISTANCE_DIAG 20
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#define SMAA_AREATEX_PIXEL_SIZE (1.0 / vec2(160.0, 560.0))
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#define SMAA_AREATEX_SUBTEX_SIZE (1.0 / 7.0)
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#define SMAA_SEARCHTEX_SIZE vec2(66.0, 33.0)
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#define SMAA_SEARCHTEX_PACKED_SIZE vec2(64.0, 16.0)
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#define SMAA_CORNER_ROUNDING 25
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#define SMAA_CORNER_ROUNDING_NORM (float(SMAA_CORNER_ROUNDING) / 100.0)
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#define SMAA_AREATEX_SELECT(sample) sample.rg
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#define SMAA_SEARCHTEX_SELECT(sample) sample.r
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#define mad(a, b, c) (a * b + c)
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#define saturate(a) clamp(a, 0.0, 1.0)
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#define round(a) floor(a + 0.5)
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uniform sampler2D edges_tex;
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uniform sampler2D area_tex;
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uniform sampler2D search_tex;
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uniform vec2 screen_size;
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uniform vec2 screen_size_inv;
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in vec2 tex_coord;
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in vec2 pixcoord;
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in vec4 offset0;
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in vec4 offset1;
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in vec4 offset2;
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out vec4 frag_color;
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vec2 cdw_end;
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vec4 textureLod_a(sampler2D edges_tex, vec2 coord, float lod) {
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#ifdef GLSL
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#else
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coord.y = 1.0 - coord.y;
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#endif
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return textureLod(edges_tex, coord, lod);
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}
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#define smaa_sample_level_zero_offset(edges_tex, coord, offset) textureLod_a(edges_tex, coord + offset * screen_size_inv.xy, 0.0)
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vec2 smaa_decode_diag_bilinear_access(vec2 e) {
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e.r = e.r * abs(5.0 * e.r - 5.0 * 0.75);
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return round(e);
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}
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vec4 smaa_decode_diag_bilinear_access(vec4 e) {
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e.rb = e.rb * abs(5.0 * e.rb - 5.0 * 0.75);
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return round(e);
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}
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vec2 smaa_search_diag1(vec2 texcoord, vec2 dir) {
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vec4 coord = vec4(texcoord, -1.0, 1.0);
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vec3 t = vec3(screen_size_inv.xy, 1.0);
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while (coord.z < float(SMAA_MAX_SEARCH_STEPS_DIAG - 1) && coord.w > 0.9) {
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coord.xyz = mad(t, vec3(dir, 1.0), coord.xyz);
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cdw_end = textureLod_a(edges_tex, coord.xy, 0.0).rg;
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coord.w = dot(cdw_end /*e*/, vec2(0.5, 0.5));
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}
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return coord.zw;
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}
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vec2 smaa_search_diag2(vec2 texcoord, vec2 dir) {
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vec4 coord = vec4(texcoord, -1.0, 1.0);
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coord.x += 0.25 * screen_size_inv.x;
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vec3 t = vec3(screen_size_inv.xy, 1.0);
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float cw = coord.w; // TODO: krafix hlsl bug
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while (coord.z < float(SMAA_MAX_SEARCH_STEPS_DIAG - 1) && cw > 0.9) {
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coord.xyz = mad(t, vec3(dir, 1.0), coord.xyz);
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cdw_end = textureLod_a(edges_tex, coord.xy, 0.0).rg;
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cdw_end = smaa_decode_diag_bilinear_access(cdw_end);
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cw = dot(cdw_end, vec2(0.5, 0.5));
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}
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coord.w = cw;
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return coord.zw;
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}
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vec2 smaa_area_diag(vec2 dist, vec2 e, float offset) {
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vec2 texcoord = mad(vec2(SMAA_AREATEX_MAX_DISTANCE_DIAG, SMAA_AREATEX_MAX_DISTANCE_DIAG), e, dist);
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texcoord = mad(SMAA_AREATEX_PIXEL_SIZE, texcoord, 0.5 * SMAA_AREATEX_PIXEL_SIZE);
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texcoord.x += 0.5;
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texcoord.y += SMAA_AREATEX_SUBTEX_SIZE * offset;
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return SMAA_AREATEX_SELECT(textureLod(area_tex, texcoord, 0.0));
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}
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vec2 smaa_calculate_diag_weights(vec2 texcoord, vec2 e, vec4 subsample_indices) {
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vec2 weights = vec2(0.0, 0.0);
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vec4 d;
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if (e.r > 0.0) {
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d.xz = smaa_search_diag1(texcoord, vec2(-1.0, 1.0));
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float dadd = cdw_end.y > 0.9 ? 1.0 : 0.0;
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d.x += dadd;
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}
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else {
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d.xz = vec2(0.0, 0.0);
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}
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d.yw = smaa_search_diag1(texcoord, vec2(1.0, -1.0));
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if (d.x + d.y > 2.0) {
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vec4 coords = mad(vec4(-d.x + 0.25, d.x, d.y, -d.y - 0.25), screen_size_inv.xyxy, texcoord.xyxy);
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vec4 c;
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c.xy = smaa_sample_level_zero_offset(edges_tex, coords.xy, vec2(-1, 0)).rg;
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c.zw = smaa_sample_level_zero_offset(edges_tex, coords.zw, vec2( 1, 0)).rg;
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c.yxwz = smaa_decode_diag_bilinear_access(c.xyzw);
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vec2 cc = mad(vec2(2.0, 2.0), c.xz, c.yw);
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float a1condx = step(0.9, d.z);
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float a1condy = step(0.9, d.w);
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if (a1condx == 1.0) cc.x = 0.0;
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if (a1condy == 1.0) cc.y = 0.0;
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weights += smaa_area_diag(d.xy, cc, subsample_indices.z);
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}
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d.xz = smaa_search_diag2(texcoord, vec2(-1.0, -1.0));
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if (smaa_sample_level_zero_offset(edges_tex, texcoord, vec2(1, 0)).r > 0.0) {
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d.yw = smaa_search_diag2(texcoord, vec2(1.0, 1.0));
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float dadd = cdw_end.y > 0.9 ? 1.0 : 0.0;
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d.y += dadd;
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}
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else {
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d.yw = vec2(0.0, 0.0);
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}
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if (d.x + d.y > 2.0) {
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vec4 coords = mad(vec4(-d.x, -d.x, d.y, d.y), screen_size_inv.xyxy, texcoord.xyxy);
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vec4 c;
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c.x = smaa_sample_level_zero_offset(edges_tex, coords.xy, vec2(-1, 0)).g;
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c.y = smaa_sample_level_zero_offset(edges_tex, coords.xy, vec2( 0, -1)).r;
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c.zw = smaa_sample_level_zero_offset(edges_tex, coords.zw, vec2( 1, 0)).gr;
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vec2 cc = mad(vec2(2.0, 2.0), c.xz, c.yw);
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float a1condx = step(0.9, d.z);
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float a1condy = step(0.9, d.w);
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if (a1condx == 1.0) cc.x = 0.0;
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if (a1condy == 1.0) cc.y = 0.0;
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weights += smaa_area_diag(d.xy, cc, subsample_indices.w).gr;
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}
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return weights;
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}
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float smaa_search_length(vec2 e, float offset) {
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vec2 scale = SMAA_SEARCHTEX_SIZE * vec2(0.5, -1.0);
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vec2 bias = SMAA_SEARCHTEX_SIZE * vec2(offset, 1.0);
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scale += vec2(-1.0, 1.0);
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bias += vec2( 0.5, -0.5);
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scale *= 1.0 / SMAA_SEARCHTEX_PACKED_SIZE;
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bias *= 1.0 / SMAA_SEARCHTEX_PACKED_SIZE;
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vec2 coord = mad(scale, e, bias);
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return SMAA_SEARCHTEX_SELECT(textureLod(search_tex, coord, 0.0));
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}
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float smaa_search_x_left(vec2 texcoord, float end) {
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vec2 e = vec2(0.0, 1.0);
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while (texcoord.x > end && e.g > 0.8281 && e.r == 0.0) {
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e = textureLod_a(edges_tex, texcoord, 0.0).rg;
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texcoord = mad(-vec2(2.0, 0.0), screen_size_inv.xy, texcoord);
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}
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float offset = mad(-(255.0 / 127.0), smaa_search_length(e, 0.0), 3.25);
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return mad(screen_size_inv.x, offset, texcoord.x);
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}
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float smaa_search_x_right(vec2 texcoord, float end) {
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vec2 e = vec2(0.0, 1.0);
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while (texcoord.x < end && e.g > 0.8281 && e.r == 0.0) {
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e = textureLod_a(edges_tex, texcoord, 0.0).rg;
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texcoord = mad(vec2(2.0, 0.0), screen_size_inv.xy, texcoord);
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}
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float offset = mad(-(255.0 / 127.0), smaa_search_length(e, 0.5), 3.25);
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return mad(-screen_size_inv.x, offset, texcoord.x);
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}
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float smaa_search_y_up(vec2 texcoord, float end) {
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vec2 e = vec2(1.0, 0.0);
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while (texcoord.y > end && e.r > 0.8281 && e.g == 0.0) {
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e = textureLod_a(edges_tex, texcoord, 0.0).rg;
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texcoord = mad(-vec2(0.0, 2.0), screen_size_inv.xy, texcoord);
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}
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float offset = mad(-(255.0 / 127.0), smaa_search_length(e.gr, 0.0), 3.25);
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return mad(screen_size_inv.y, offset, texcoord.y);
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}
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float smaa_search_y_down(vec2 texcoord, float end) {
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vec2 e = vec2(1.0, 0.0);
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while (texcoord.y < end && e.r > 0.8281 && e.g == 0.0) {
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e = textureLod_a(edges_tex, texcoord, 0.0).rg;
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texcoord = mad(vec2(0.0, 2.0), screen_size_inv.xy, texcoord);
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}
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float offset = mad(-(255.0 / 127.0), smaa_search_length(e.gr, 0.5), 3.25);
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return mad(-screen_size_inv.y, offset, texcoord.y);
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}
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vec2 smaa_area(vec2 dist, float e1, float e2, float offset) {
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vec2 texcoord = mad(vec2(SMAA_AREATEX_MAX_DISTANCE, SMAA_AREATEX_MAX_DISTANCE), round(4.0 * vec2(e1, e2)), dist);
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texcoord = mad(SMAA_AREATEX_PIXEL_SIZE, texcoord, 0.5 * SMAA_AREATEX_PIXEL_SIZE);
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texcoord.y = mad(SMAA_AREATEX_SUBTEX_SIZE, offset, texcoord.y);
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return SMAA_AREATEX_SELECT(textureLod(area_tex, texcoord, 0.0));
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}
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vec2 smaa_detect_horizontal_corner_pattern(vec2 weights, vec4 texcoord, vec2 d) {
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vec2 left_right = step(d.xy, d.yx);
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vec2 rounding = (1.0 - SMAA_CORNER_ROUNDING_NORM) * left_right;
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rounding /= left_right.x + left_right.y;
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vec2 factor = vec2(1.0, 1.0);
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factor.x -= rounding.x * smaa_sample_level_zero_offset(edges_tex, texcoord.xy, vec2(0, 1)).r;
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factor.x -= rounding.y * smaa_sample_level_zero_offset(edges_tex, texcoord.zw, vec2(1, 1)).r;
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factor.y -= rounding.x * smaa_sample_level_zero_offset(edges_tex, texcoord.xy, vec2(0, -2)).r;
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factor.y -= rounding.y * smaa_sample_level_zero_offset(edges_tex, texcoord.zw, vec2(1, -2)).r;
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weights *= saturate(factor);
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return weights;
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}
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vec2 smaa_detect_vertical_corner_pattern(vec2 weights, vec4 texcoord, vec2 d) {
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vec2 left_right = step(d.xy, d.yx);
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vec2 rounding = (1.0 - SMAA_CORNER_ROUNDING_NORM) * left_right;
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rounding /= left_right.x + left_right.y;
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vec2 factor = vec2(1.0, 1.0);
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factor.x -= rounding.x * smaa_sample_level_zero_offset(edges_tex, texcoord.xy, vec2( 1, 0)).g;
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factor.x -= rounding.y * smaa_sample_level_zero_offset(edges_tex, texcoord.zw, vec2( 1, 1)).g;
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factor.y -= rounding.x * smaa_sample_level_zero_offset(edges_tex, texcoord.xy, vec2(-2, 0)).g;
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factor.y -= rounding.y * smaa_sample_level_zero_offset(edges_tex, texcoord.zw, vec2(-2, 1)).g;
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weights *= saturate(factor);
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return weights;
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}
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vec4 smaa_blending_weight_calculation_ps(vec2 texcoord, vec2 pixcoord, vec4 subsample_indices) {
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vec4 weights = vec4(0.0, 0.0, 0.0, 0.0);
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vec2 e = textureLod_a(edges_tex, texcoord, 0.0).rg;
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if (e.g > 0.0) {
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weights.rg = smaa_calculate_diag_weights(texcoord, e, subsample_indices);
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if (weights.r == -weights.g) {
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vec2 d;
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vec3 coords;
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coords.x = smaa_search_x_left(offset0.xy, offset2.x);
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coords.y = offset1.y;
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d.x = coords.x;
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float e1 = textureLod_a(edges_tex, coords.xy, 0.0).r;
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coords.z = smaa_search_x_right(offset0.zw, offset2.y);
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d.y = coords.z;
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d = abs(round(mad(screen_size.xx, d, -pixcoord.xx)));
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vec2 sqrt_d = sqrt(d);
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float e2 = smaa_sample_level_zero_offset(edges_tex, coords.zy, vec2(1, 0)).r;
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weights.rg = smaa_area(sqrt_d, e1, e2, subsample_indices.y);
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coords.y = texcoord.y;
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weights.rg = smaa_detect_horizontal_corner_pattern(weights.rg, coords.xyzy, d);
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}
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else {
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e.r = 0.0;
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}
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}
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if (e.r > 0.0) {
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vec2 d;
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vec3 coords;
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coords.y = smaa_search_y_up(offset1.xy, offset2.z);
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coords.x = offset0.x;
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d.x = coords.y;
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float e1 = textureLod_a(edges_tex, coords.xy, 0.0).g;
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coords.z = smaa_search_y_down(offset1.zw, offset2.w);
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d.y = coords.z;
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d = abs(round(mad(screen_size.yy, d, -pixcoord.yy)));
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vec2 sqrt_d = sqrt(d);
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float e2 = smaa_sample_level_zero_offset(edges_tex, coords.xz, vec2(0, 1)).g;
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weights.ba = smaa_area(sqrt_d, e1, e2, subsample_indices.x);
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coords.x = texcoord.x;
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weights.ba = smaa_detect_vertical_corner_pattern(weights.ba, coords.xyxz, d);
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}
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return weights;
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}
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void main() {
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frag_color = smaa_blending_weight_calculation_ps(tex_coord, pixcoord, vec4(0.0, 0.0, 0.0, 0.0));
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}
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