diff options
Diffstat (limited to 'source/blender/draw/engines/eevee/shaders/effect_dof_lib.glsl')
| -rw-r--r-- | source/blender/draw/engines/eevee/shaders/effect_dof_lib.glsl | 631 |
1 files changed, 631 insertions, 0 deletions
diff --git a/source/blender/draw/engines/eevee/shaders/effect_dof_lib.glsl b/source/blender/draw/engines/eevee/shaders/effect_dof_lib.glsl new file mode 100644 index 00000000000..88d83cd913a --- /dev/null +++ b/source/blender/draw/engines/eevee/shaders/effect_dof_lib.glsl @@ -0,0 +1,631 @@ + +#pragma BLENDER_REQUIRE(common_view_lib.glsl) +#pragma BLENDER_REQUIRE(common_math_lib.glsl) + +uniform vec4 cocParams; + +#define cocMul cocParams[0] /* distance * aperturesize * invsensorsize */ +#define cocBias cocParams[1] /* aperturesize * invsensorsize */ +#define cocNear cocParams[2] /* Near view depths value. */ +#define cocFar cocParams[3] /* Far view depths value. */ + +/* -------------- Debug Defines ------------- */ + +// #define DOF_DEBUG_GATHER_PERF +// #define DOF_DEBUG_SCATTER_PERF + +const bool no_smooth_intersection = false; +const bool no_gather_occlusion = false; +const bool no_gather_mipmaps = false; +const bool no_gather_random = false; +const bool no_gather_filtering = false; +const bool no_scatter_occlusion = false; +const bool no_scatter_pass = false; +const bool no_foreground_pass = false; +const bool no_background_pass = false; +const bool no_slight_focus_pass = false; +const bool no_focus_pass = false; +const bool no_holefill_pass = false; + +/* -------------- Quality Defines ------------- */ + +#ifdef DOF_HOLEFILL_PASS +/* No need for very high density for holefill. */ +const int gather_ring_count = 3; +const int gather_ring_density = 3; +const int gather_max_density_change = 0; +const int gather_density_change_ring = 1; +#else +const int gather_ring_count = DOF_GATHER_RING_COUNT; +const int gather_ring_density = 3; +const int gather_max_density_change = 50; /* Dictates the maximum good quality blur. */ +const int gather_density_change_ring = 1; +#endif + +/* -------------- Utils ------------- */ + +const vec2 quad_offsets[4] = vec2[4]( + vec2(-0.5, 0.5), vec2(0.5, 0.5), vec2(0.5, -0.5), vec2(-0.5, -0.5)); + +/* Divide by sensor size to get the normalized size. */ +#define calculate_coc_persp(zdepth) (cocMul / zdepth - cocBias) +#define calculate_coc_ortho(zdepth) ((zdepth + cocMul / cocBias) * cocMul) +#define calculate_coc(z) \ + (ProjectionMatrix[3][3] == 0.0) ? calculate_coc_persp(z) : calculate_coc_ortho(z) + +/* Ortho conversion is only true for camera view! */ +#define linear_depth_persp(d) ((cocNear * cocFar) / (d * (cocNear - cocFar) + cocFar)) +#define linear_depth_ortho(d) (d * (cocNear - cocFar) + cocNear) + +#define linear_depth(d) \ + ((ProjectionMatrix[3][3] == 0.0) ? linear_depth_persp(d) : linear_depth_ortho(d)) + +#define dof_coc_from_zdepth(d) calculate_coc(linear_depth(d)) + +vec4 safe_color(vec4 c) +{ + /* Clamp to avoid black square artifacts if a pixel goes NaN. */ + return clamp(c, vec4(0.0), vec4(1e20)); /* 1e20 arbitrary. */ +} + +float dof_hdr_color_weight(vec4 color) +{ + /* From UE4. Very fast "luma" weighting. */ + float luma = (color.g * 2.0) + (color.r + color.b); + /* TODO(fclem) Pass correct exposure. */ + const float exposure = 1.0; + return 1.0 / (luma * exposure + 4.0); +} + +float dof_coc_select(vec4 cocs) +{ + /* Select biggest coc. */ + float selected_coc = cocs.x; + if (abs(cocs.y) > abs(selected_coc)) { + selected_coc = cocs.y; + } + if (abs(cocs.z) > abs(selected_coc)) { + selected_coc = cocs.z; + } + if (abs(cocs.w) > abs(selected_coc)) { + selected_coc = cocs.w; + } + return selected_coc; +} + +/* NOTE: Do not forget to normalize weights afterwards. */ +vec4 dof_downsample_bilateral_coc_weights(vec4 cocs) +{ + float chosen_coc = dof_coc_select(cocs); + + const float scale = 4.0; /* TODO(fclem) revisit. */ + /* NOTE: The difference between the cocs should be inside a abs() function, + * but we follow UE4 implementation to improve how dithered transparency looks (see slide 19). */ + return saturate(1.0 - (chosen_coc - cocs) * scale); +} + +/* NOTE: Do not forget to normalize weights afterwards. */ +vec4 dof_downsample_bilateral_color_weights(vec4 colors[4]) +{ + vec4 weights; + for (int i = 0; i < 4; i++) { + weights[i] = dof_hdr_color_weight(colors[i]); + } + return weights; +} + +/* Makes sure the load functions distribute the energy correctly + * to both scatter and gather passes. */ +vec4 dof_load_gather_color(sampler2D gather_input_color_buffer, vec2 uv, float lod) +{ + vec4 color = textureLod(gather_input_color_buffer, uv, lod); + return color; +} + +vec4 dof_load_scatter_color(sampler2D scatter_input_color_buffer, vec2 uv, float lod) +{ + vec4 color = textureLod(scatter_input_color_buffer, uv, lod); + return color; +} + +float dof_load_gather_coc(sampler2D gather_input_coc_buffer, vec2 uv, float lod) +{ + float coc = textureLod(gather_input_coc_buffer, uv, lod).r; + /* We gather at halfres. CoC must be divided by 2 to be compared against radii. */ + return coc * 0.5; +} + +/* Distribute weights between near/slightfocus/far fields (slide 117). */ +const float layer_threshold = 4.0; +/* Make sure it overlaps. */ +const float layer_offset_fg = 0.5 + 1.0; +/* Extra offset for convolution layers to avoid light leaking from background. */ +const float layer_offset = 0.5 + 0.5; + +#define DOF_MAX_SLIGHT_FOCUS_RADIUS 5 + +float dof_layer_weight(float coc, const bool is_foreground) +{ +/* NOTE: These are fullres pixel CoC value. */ +#ifdef DOF_RESOLVE_PASS + return saturate(-abs(coc) + layer_threshold + layer_offset) * + float(is_foreground ? (coc <= 0.5) : (coc > -0.5)); +#else + coc *= 2.0; /* Account for half pixel gather. */ + float threshold = layer_threshold - ((is_foreground) ? layer_offset_fg : layer_offset); + return saturate(((is_foreground) ? -coc : coc) - threshold); +#endif +} +vec4 dof_layer_weight(vec4 coc) +{ + /* NOTE: Used for scatter pass which already flipped the sign correctly. */ + coc *= 2.0; /* Account for half pixel gather. */ + return saturate(coc - layer_threshold + layer_offset); +} + +/* NOTE: This is halfres CoC radius. */ +float dof_sample_weight(float coc) +{ + /* Full intensity if CoC radius is below the pixel footprint. */ + const float min_coc = 1.0; + coc = max(min_coc, abs(coc)); + return (M_PI * min_coc * min_coc) / (M_PI * coc * coc); +} +vec4 dof_sample_weight(vec4 coc) +{ + /* Full intensity if CoC radius is below the pixel footprint. */ + const float min_coc = 1.0; + coc = max(vec4(min_coc), abs(coc)); + return (M_PI * min_coc * min_coc) / (M_PI * coc * coc); +} + +/* Intersection with the center of the kernel. */ +float dof_intersection_weight(float coc, float distance_from_center, float intersection_multiplier) +{ + if (no_smooth_intersection) { + return step(0.0, (abs(coc) - distance_from_center)); + } + else { + /* (Slide 64). */ + return saturate((abs(coc) - distance_from_center) * intersection_multiplier + 0.5); + } +} + +/* Returns weight of the sample for the outer bucket (containing previous rings). */ +float dof_gather_accum_weight(float coc, float bordering_radius, bool first_ring) +{ + /* First ring has nothing to be mixed against. */ + if (first_ring) { + return 0.0; + } + return saturate(coc - bordering_radius); +} + +bool dof_do_fast_gather(float max_absolute_coc, float min_absolute_coc, const bool is_foreground) +{ + float min_weight = dof_layer_weight((is_foreground) ? -min_absolute_coc : min_absolute_coc, + is_foreground); + if (min_weight < 1.0) { + return false; + } + /* FIXME(fclem): This is a workaround to fast gather triggering too early. + * Since we use custom opacity mask, the opacity is not given to be 100% even for + * after normal threshold. */ + if (is_foreground && min_absolute_coc < layer_threshold) { + return false; + } + return (max_absolute_coc - min_absolute_coc) < (DOF_FAST_GATHER_COC_ERROR * max_absolute_coc); +} + +/* ------------------- COC TILES UTILS ------------------- */ + +struct CocTile { + float fg_min_coc; + float fg_max_coc; + float fg_max_intersectable_coc; + float fg_slight_focus_max_coc; + float bg_min_coc; + float bg_max_coc; + float bg_min_intersectable_coc; +}; + +struct CocTilePrediction { + bool do_foreground; + bool do_slight_focus; + bool do_focus; + bool do_background; + bool do_holefill; +}; + +/* WATCH: Might have to change depending on the texture format. */ +#define DOF_TILE_DEFOCUS 0.25 +#define DOF_TILE_FOCUS 0.0 +#define DOF_TILE_MIXED 0.75 +#define DOF_TILE_LARGE_COC 1024.0 + +/* Init a CoC tile for reduction algorithms. */ +CocTile dof_coc_tile_init(void) +{ + CocTile tile; + tile.fg_min_coc = 0.0; + tile.fg_max_coc = -DOF_TILE_LARGE_COC; + tile.fg_max_intersectable_coc = DOF_TILE_LARGE_COC; + tile.fg_slight_focus_max_coc = -1.0; + tile.bg_min_coc = DOF_TILE_LARGE_COC; + tile.bg_max_coc = 0.0; + tile.bg_min_intersectable_coc = DOF_TILE_LARGE_COC; + return tile; +} + +CocTile dof_coc_tile_load(sampler2D fg_buffer, sampler2D bg_buffer, ivec2 tile_co) +{ + ivec2 tex_size = textureSize(fg_buffer, 0).xy; + tile_co = clamp(tile_co, ivec2(0), tex_size - 1); + + vec4 fg = texelFetch(fg_buffer, tile_co, 0); + vec3 bg = texelFetch(bg_buffer, tile_co, 0).xyz; + + CocTile tile; + tile.fg_min_coc = -fg.x; + tile.fg_max_coc = -fg.y; + tile.fg_max_intersectable_coc = -fg.z; + tile.fg_slight_focus_max_coc = fg.w; + tile.bg_min_coc = bg.x; + tile.bg_max_coc = bg.y; + tile.bg_min_intersectable_coc = bg.z; + return tile; +} + +void dof_coc_tile_store(CocTile tile, out vec4 out_fg, out vec3 out_bg) +{ + out_fg.x = -tile.fg_min_coc; + out_fg.y = -tile.fg_max_coc; + out_fg.z = -tile.fg_max_intersectable_coc; + out_fg.w = tile.fg_slight_focus_max_coc; + out_bg.x = tile.bg_min_coc; + out_bg.y = tile.bg_max_coc; + out_bg.z = tile.bg_min_intersectable_coc; +} + +CocTilePrediction dof_coc_tile_prediction_get(CocTile tile) +{ + /* Based on tile value, predict what pass we need to load. */ + CocTilePrediction predict; + + predict.do_foreground = (-tile.fg_min_coc > layer_threshold - layer_offset_fg); + bool fg_fully_opaque = predict.do_foreground && + dof_do_fast_gather(-tile.fg_min_coc, -tile.fg_max_coc, true); + + predict.do_slight_focus = !fg_fully_opaque && (tile.fg_slight_focus_max_coc >= 0.5); + predict.do_focus = !fg_fully_opaque && (tile.fg_slight_focus_max_coc == DOF_TILE_FOCUS); + + predict.do_background = !predict.do_focus && !fg_fully_opaque && + (tile.bg_max_coc > layer_threshold - layer_offset); + bool bg_fully_opaque = predict.do_background && + dof_do_fast_gather(-tile.bg_max_coc, tile.bg_min_coc, false); + predict.do_holefill = !predict.do_focus && !fg_fully_opaque && -tile.fg_max_coc > 0.0; + +#if 0 /* Debug */ + predict.do_foreground = predict.do_background = predict.do_holefill = true; +#endif + return predict; +} + +/* Special function to return the correct max value of 2 slight focus coc. */ +float dof_coc_max_slight_focus(float coc1, float coc2) +{ + /* Do not consider values below 0.5 for expansion as they are "encoded". + * See setup pass shader for more infos. */ + if ((coc1 == DOF_TILE_DEFOCUS && coc2 == DOF_TILE_FOCUS) || + (coc1 == DOF_TILE_FOCUS && coc2 == DOF_TILE_DEFOCUS)) { + /* Tile where completely out of focus and in focus are both present. + * Consider as very slightly out of focus. */ + return DOF_TILE_MIXED; + } + return max(coc1, coc2); +} + +/* ------------------- GATHER UTILS ------------------- */ + +struct DofGatherData { + vec4 color; + float weight; + float dist; /* TODO remove */ + /* For scatter occlusion. */ + float coc; + float coc_sqr; + /* For ring bucket merging. */ + float transparency; + + float layer_opacity; +}; + +#define GATHER_DATA_INIT DofGatherData(vec4(0.0), 0.0, 0.0, 0.0, 0.0, 0.0, 0.0) + +void dof_gather_ammend_weight(inout DofGatherData sample_data, float weight) +{ + sample_data.color *= weight; + sample_data.coc *= weight; + sample_data.coc_sqr *= weight; + sample_data.weight *= weight; +} + +void dof_gather_accumulate_sample(DofGatherData sample_data, + float weight, + inout DofGatherData accum_data) +{ + accum_data.color += sample_data.color * weight; + accum_data.coc += sample_data.coc * weight; + accum_data.coc_sqr += sample_data.coc * (sample_data.coc * weight); + accum_data.weight += weight; +} + +void dof_gather_accumulate_sample_pair(DofGatherData pair_data[2], + float bordering_radius, + float intersection_multiplier, + bool first_ring, + const bool do_fast_gather, + const bool is_foreground, + inout DofGatherData ring_data, + inout DofGatherData accum_data) +{ + if (do_fast_gather) { + for (int i = 0; i < 2; i++) { + dof_gather_accumulate_sample(pair_data[i], 1.0, accum_data); + accum_data.layer_opacity += 1.0; + } + return; + } + +#if 0 + const float mirroring_threshold = -layer_threshold - layer_offset; + /* TODO(fclem) Promote to parameter? dither with Noise? */ + const float mirroring_min_distance = 15.0; + if (pair_data[0].coc < mirroring_threshold && + (pair_data[1].coc - mirroring_min_distance) > pair_data[0].coc) { + pair_data[1].coc = pair_data[0].coc; + } + else if (pair_data[1].coc < mirroring_threshold && + (pair_data[0].coc - mirroring_min_distance) > pair_data[1].coc) { + pair_data[0].coc = pair_data[1].coc; + } +#endif + + for (int i = 0; i < 2; i++) { + float sample_weight = dof_sample_weight(pair_data[i].coc); + float layer_weight = dof_layer_weight(pair_data[i].coc, is_foreground); + float inter_weight = dof_intersection_weight( + pair_data[i].coc, pair_data[i].dist, intersection_multiplier); + float weight = inter_weight * layer_weight * sample_weight; + + /** + * If a CoC is larger than bordering radius we accumulate it to the general accumulator. + * If not, we accumulate to the ring bucket. This is to have more consistent sample occlusion. + **/ + float accum_weight = dof_gather_accum_weight(pair_data[i].coc, bordering_radius, first_ring); + dof_gather_accumulate_sample(pair_data[i], weight * accum_weight, accum_data); + dof_gather_accumulate_sample(pair_data[i], weight * (1.0 - accum_weight), ring_data); + + accum_data.layer_opacity += layer_weight; + + if (is_foreground) { + ring_data.transparency += 1.0 - inter_weight * layer_weight; + } + else { + float coc = is_foreground ? -pair_data[i].coc : pair_data[i].coc; + ring_data.transparency += saturate(coc - bordering_radius); + } + } +} + +void dof_gather_accumulate_sample_ring(DofGatherData ring_data, + int sample_count, + bool first_ring, + const bool do_fast_gather, + /* accum_data occludes the ring_data if true. */ + const bool reversed_occlusion, + inout DofGatherData accum_data) +{ + if (do_fast_gather) { + /* Do nothing as ring_data contains nothing. All samples are already in accum_data. */ + return; + } + + if (first_ring) { + /* Layer opacity is directly accumulated into accum_data data. */ + accum_data.color = ring_data.color; + accum_data.coc = ring_data.coc; + accum_data.coc_sqr = ring_data.coc_sqr; + accum_data.weight = ring_data.weight; + + accum_data.transparency = ring_data.transparency / float(sample_count); + return; + } + + if (ring_data.weight == 0.0) { + return; + } + + float ring_avg_coc = ring_data.coc / ring_data.weight; + float accum_avg_coc = accum_data.coc / accum_data.weight; + + /* Smooth test to set opacity to see if the ring average coc occludes the accumulation. + * Test is reversed to be multiplied against opacity. */ + float ring_occlu = saturate(accum_avg_coc - ring_avg_coc); + /* The bias here is arbitrary. Seems to avoid weird looking foreground in most cases. + * We might need to make it a parameter or find a relative bias. */ + float accum_occlu = saturate((ring_avg_coc - accum_avg_coc) * 0.1 - 1.0); + +#ifdef DOF_RESOLVE_PASS + ring_occlu = accum_occlu = 0.0; +#endif + + if (no_gather_occlusion) { + ring_occlu = 0.0; + accum_occlu = 0.0; + } + + /* (Slide 40) */ + float ring_opacity = saturate(1.0 - ring_data.transparency / float(sample_count)); + float accum_opacity = 1.0 - accum_data.transparency; + + if (reversed_occlusion) { + /* Accum_data occludes the ring. */ + float alpha = (accum_data.weight == 0.0) ? 0.0 : accum_opacity * accum_occlu; + float one_minus_alpha = 1.0 - alpha; + + accum_data.color += ring_data.color * one_minus_alpha; + accum_data.coc += ring_data.coc * one_minus_alpha; + accum_data.coc_sqr += ring_data.coc_sqr * one_minus_alpha; + accum_data.weight += ring_data.weight * one_minus_alpha; + + accum_data.transparency *= 1.0 - ring_opacity; + } + else { + /* Ring occludes the accum_data (Same as reference). */ + float alpha = (accum_data.weight == 0.0) ? 1.0 : (ring_opacity * ring_occlu); + float one_minus_alpha = 1.0 - alpha; + + accum_data.color = accum_data.color * one_minus_alpha + ring_data.color; + accum_data.coc = accum_data.coc * one_minus_alpha + ring_data.coc; + accum_data.coc_sqr = accum_data.coc_sqr * one_minus_alpha + ring_data.coc_sqr; + accum_data.weight = accum_data.weight * one_minus_alpha + ring_data.weight; + } +} + +/* FIXME(fclem) Seems to be wrong since it needs ringcount+1 as input for slightfocus gather. */ +int dof_gather_total_sample_count(const int ring_count, const int ring_density) +{ + return (ring_count * ring_count - ring_count) * ring_density + 1; +} + +void dof_gather_accumulate_center_sample(DofGatherData center_data, + float bordering_radius, +#ifdef DOF_RESOLVE_PASS + int i_radius, +#endif + const bool do_fast_gather, + const bool is_foreground, + inout DofGatherData accum_data) +{ + float layer_weight = dof_layer_weight(center_data.coc, is_foreground); + float sample_weight = dof_sample_weight(center_data.coc); + float weight = layer_weight * sample_weight; + float accum_weight = dof_gather_accum_weight(center_data.coc, bordering_radius, false); + + if (do_fast_gather) { + /* Hope for the compiler to optimize the above. */ + layer_weight = 1.0; + sample_weight = 1.0; + accum_weight = 1.0; + weight = 1.0; + } + + center_data.transparency = 1.0 - weight; + + dof_gather_accumulate_sample(center_data, weight * accum_weight, accum_data); + + if (!do_fast_gather) { +#ifdef DOF_RESOLVE_PASS + /* NOTE(fclem): Hack to smooth transition to full in-focus opacity. */ + int total_sample_count = dof_gather_total_sample_count(i_radius + 1, DOF_SLIGHT_FOCUS_DENSITY); + float fac = saturate(1.0 - abs(center_data.coc) / float(layer_threshold)); + accum_data.layer_opacity += float(total_sample_count) * fac * fac; +#endif + accum_data.layer_opacity += layer_weight; + + /* Logic of dof_gather_accumulate_sample(). */ + weight *= (1.0 - accum_weight); + center_data.coc_sqr = center_data.coc * (center_data.coc * weight); + center_data.color *= weight; + center_data.coc *= weight; + center_data.weight = weight; + +#ifdef DOF_FOREGROUND_PASS /* Reduce issue with closer foreground over distant foreground. */ + float ring_area = sqr(bordering_radius); + dof_gather_ammend_weight(center_data, ring_area); +#endif + + /* Accumulate center as its own ring. */ + dof_gather_accumulate_sample_ring( + center_data, 1, false, do_fast_gather, is_foreground, accum_data); + } +} + +int dof_gather_total_sample_count_with_density_change(const int ring_count, + const int ring_density, + int density_change) +{ + int sample_count_per_density_change = dof_gather_total_sample_count(ring_count, ring_density) - + dof_gather_total_sample_count( + ring_count - gather_density_change_ring, ring_density); + + return dof_gather_total_sample_count(ring_count, ring_density) + + sample_count_per_density_change * density_change; +} + +void dof_gather_accumulate_resolve(int total_sample_count, + DofGatherData accum_data, + out vec4 out_col, + out float out_weight, + out vec2 out_occlusion) +{ + float weight_inv = safe_rcp(accum_data.weight); + out_col = accum_data.color * weight_inv; + out_occlusion = vec2(abs(accum_data.coc), accum_data.coc_sqr) * weight_inv; + +#ifdef DOF_FOREGROUND_PASS + out_weight = 1.0 - accum_data.transparency; +#else + if (accum_data.weight > 0.0) { + out_weight = accum_data.layer_opacity / float(total_sample_count); + } + else { + out_weight = 0.0; + } +#endif + /* Gathering may not accumulate to 1.0 alpha because of float precision. */ + if (out_weight > 0.99) { + out_weight = 1.0; + } + else if (out_weight < 0.01) { + out_weight = 0.0; + } + /* Same thing for alpha channel. */ + if (out_col.a > 0.99) { + out_col.a = 1.0; + } + else if (out_col.a < 0.01) { + out_col.a = 0.0; + } +} + +ivec2 dof_square_ring_sample_offset(int ring_distance, int sample_id) +{ + /** + * Generate samples in a square pattern with the ring radius. X is the center tile. + * + * Dist1 Dist2 + * 6 5 4 3 2 + * 3 2 1 7 1 + * . X 0 . X 0 + * . . . . . + * . . . . . + * + * Samples are expected to be mirrored to complete the pattern. + **/ + ivec2 offset; + if (sample_id < ring_distance) { + offset.x = ring_distance; + offset.y = sample_id; + } + else if (sample_id < ring_distance * 3) { + offset.x = ring_distance - sample_id + ring_distance; + offset.y = ring_distance; + } + else { + offset.x = -ring_distance; + offset.y = ring_distance - sample_id + 3 * ring_distance; + } + return offset; +}
\ No newline at end of file |