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https://github.com/italicsjenga/slang-shaders.git
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418 lines
20 KiB
C
418 lines
20 KiB
C
///////////////////////////// GPL LICENSE NOTICE /////////////////////////////
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// crt-royale: A full-featured CRT shader, with cheese.
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// Copyright (C) 2014 TroggleMonkey <trogglemonkey@gmx.com>
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//
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// This program is free software; you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by the Free
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// Software Foundation; either version 2 of the License, or any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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// more details.
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//
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// You should have received a copy of the GNU General Public License along with
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// this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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// Place, Suite 330, Boston, MA 02111-1307 USA
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layout(push_constant) uniform Push
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{
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vec4 SourceSize;
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vec4 OriginalSize;
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vec4 OutputSize;
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uint FrameCount;
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vec4 ORIG_LINEARIZEDSize;
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} params;
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layout(std140, set = 0, binding = 0) uniform UBO
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{
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mat4 MVP;
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float crt_gamma;
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float lcd_gamma;
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float levels_contrast;
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float halation_weight;
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float diffusion_weight;
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float bloom_underestimate_levels;
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float bloom_excess;
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float beam_min_sigma;
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float beam_max_sigma;
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float beam_spot_power;
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float beam_min_shape;
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float beam_max_shape;
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float beam_shape_power;
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float beam_horiz_filter;
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float beam_horiz_sigma;
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float beam_horiz_linear_rgb_weight;
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float convergence_offset_x_r;
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float convergence_offset_x_g;
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float convergence_offset_x_b;
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float convergence_offset_y_r;
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float convergence_offset_y_g;
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float convergence_offset_y_b;
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float mask_type;
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float mask_sample_mode_desired;
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float mask_num_triads_desired;
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float mask_triad_size_desired;
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float mask_specify_num_triads;
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float aa_subpixel_r_offset_x_runtime;
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float aa_subpixel_r_offset_y_runtime;
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float aa_cubic_c;
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float aa_gauss_sigma;
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float geom_mode_runtime;
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float geom_radius;
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float geom_view_dist;
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float geom_tilt_angle_x;
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float geom_tilt_angle_y;
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float geom_aspect_ratio_x;
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float geom_aspect_ratio_y;
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float geom_overscan_x;
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float geom_overscan_y;
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float border_size;
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float border_darkness;
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float border_compress;
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float interlace_bff;
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float interlace_1080i;
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} global;
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#define ORIG_LINEARIZEDvideo_size params.SourceSize.xy
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#define ORIG_LINEARIZEDtexture_size params.SourceSize.xy
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float bloom_approx_scale_x = params.OutputSize.x / params.SourceSize.y;
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const float max_viewport_size_x = 1080.0*1024.0*(4.0/3.0);
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/////////////////////////////// VERTEX INCLUDES ///////////////////////////////
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#include "params.inc"
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#include "../../../../include/compat_macros.inc"
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#include "../user-settings.h"
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#include "bind-shader-params.h"
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#include "../../../../include/gamma-management.h"
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#include "derived-settings-and-constants.h"
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#include "scanline-functions.h"
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#pragma stage vertex
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layout(location = 0) in vec4 Position;
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layout(location = 1) in vec2 TexCoord;
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layout(location = 0) out vec2 tex_uv;
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layout(location = 1) out vec2 blur_dxdy;
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layout(location = 2) out vec2 uv_scanline_step;
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layout(location = 3) out float estimated_viewport_size_x;
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layout(location = 4) out vec2 texture_size_inv;
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layout(location = 5) out vec2 tex_uv_to_pixel_scale;
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void main()
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{
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gl_Position = global.MVP * Position;
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float2 vTexCoord = TexCoord;
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const float2 video_uv = vTexCoord * IN.texture_size/IN.video_size;
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tex_uv = video_uv * ORIG_LINEARIZEDvideo_size /
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ORIG_LINEARIZEDtexture_size;
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// The last pass (vertical scanlines) had a viewport y scale, so we can
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// use it to calculate a better runtime sigma:
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estimated_viewport_size_x =
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IN.video_size.y * geom_aspect_ratio_x/geom_aspect_ratio_y;
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// Get the uv sample distance between output pixels. We're using a resize
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// blur, so arbitrary upsizing will be acceptable if filter_linearN =
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// "true," and arbitrary downsizing will be acceptable if mipmap_inputN =
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// "true" too. The blur will be much more accurate if a true 4x4 Gaussian
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// resize is used instead of tex2Dblur3x3_resize (which samples between
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// texels even for upsizing).
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const float2 dxdy_min_scale = ORIG_LINEARIZEDvideo_size/IN.output_size;
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const float2 texture_size_inv = float2(1.0)/ORIG_LINEARIZEDtexture_size;
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if(bloom_approx_filter > 1.5) // 4x4 true Gaussian resize
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{
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// For upsizing, we'll snap to texels and sample the nearest 4.
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const float2 dxdy_scale = max(dxdy_min_scale, float2(1.0));
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blur_dxdy = dxdy_scale * texture_size_inv;
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}
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else
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{
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const float2 dxdy_scale = dxdy_min_scale;
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blur_dxdy = dxdy_scale * texture_size_inv;
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}
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// tex2Dresize_gaussian4x4 needs to know a bit more than the other filters:
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tex_uv_to_pixel_scale = IN.output_size *
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ORIG_LINEARIZEDtexture_size / ORIG_LINEARIZEDvideo_size;
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//texture_size_inv = texture_size_inv;
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// Detecting interlacing again here lets us apply convergence offsets in
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// this pass. il_step_multiple contains the (texel, scanline) step
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// multiple: 1 for progressive, 2 for interlaced.
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const float2 orig_video_size = ORIG_LINEARIZEDvideo_size;
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const float y_step = 1.0 + float(is_interlaced(orig_video_size.y));
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const float2 il_step_multiple = float2(1.0, y_step);
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// Get the uv distance between (texels, same-field scanlines):
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uv_scanline_step = il_step_multiple / ORIG_LINEARIZEDtexture_size;
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}
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#pragma stage fragment
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#pragma format R8G8B8A8_SRGB
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layout(location = 0) in vec2 tex_uv;
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layout(location = 1) in vec2 blur_dxdy;
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layout(location = 2) in vec2 uv_scanline_step;
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layout(location = 3) in float estimated_viewport_size_x;
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layout(location = 4) in vec2 texture_size_inv;
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layout(location = 5) in vec2 tex_uv_to_pixel_scale;
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layout(location = 0) out vec4 FragColor;
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layout(set = 0, binding = 2) uniform sampler2D Source;
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layout(set = 0, binding = 3) uniform sampler2D ORIG_LINEARIZED;
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layout(set = 0, binding = 4) uniform sampler2D Original;
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////////////////////////////// FRAGMENT INCLUDES //////////////////////////////
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#include "../../../../include/blur-functions.h"
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#include "bloom-functions.h"
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#include "../../../../include/gamma-management.h"
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/////////////////////////////////// HELPERS //////////////////////////////////
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float3 tex2Dresize_gaussian4x4(sampler2D tex, float2 tex_uv, float2 dxdy, float2 tex_size, float2 texture_size_inv, float2 tex_uv_to_pixel_scale, float sigma)
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{
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// Requires: 1.) All requirements of gamma-management.h must be satisfied!
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// 2.) filter_linearN must == "true" in your .cgp preset.
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// 3.) mipmap_inputN must == "true" in your .cgp preset if
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// IN.output_size << SRC.video_size.
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// 4.) dxdy should contain the uv pixel spacing:
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// dxdy = max(float2(1.0),
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// SRC.video_size/IN.output_size)/SRC.texture_size;
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// 5.) texture_size == SRC.texture_size
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// 6.) texture_size_inv == float2(1.0)/SRC.texture_size
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// 7.) tex_uv_to_pixel_scale == IN.output_size *
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// SRC.texture_size / SRC.video_size;
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// 8.) sigma is the desired Gaussian standard deviation, in
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// terms of output pixels. It should be < ~0.66171875 to
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// ensure the first unused sample (outside the 4x4 box) has
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// a weight < 1.0/256.0.
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// Returns: A true 4x4 Gaussian resize of the input.
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// Description:
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// Given correct inputs, this Gaussian resizer samples 4 pixel locations
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// along each downsized dimension and/or 4 texel locations along each
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// upsized dimension. It computes dynamic weights based on the pixel-space
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// distance of each sample from the destination pixel. It is arbitrarily
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// resizable and higher quality than tex2Dblur3x3_resize, but it's slower.
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// TODO: Move this to a more suitable file once there are others like it.
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const float denom_inv = 0.5/(sigma*sigma);
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// We're taking 4x4 samples, and we're snapping to texels for upsizing.
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// Find texture coords for sample 5 (second row, second column):
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const float2 curr_texel = tex_uv * tex_size;
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const float2 prev_texel =
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floor(curr_texel - float2(under_half)) + float2(0.5);
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const float2 prev_texel_uv = prev_texel * texture_size_inv;
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const float2 snap = float2((dxdy.x <= texture_size_inv.x), (dxdy.y <= texture_size_inv.y));
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const float2 sample5_downsize_uv = tex_uv - 0.5 * dxdy;
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const float2 sample5_uv = lerp(sample5_downsize_uv, prev_texel_uv, snap);
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// Compute texture coords for other samples:
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const float2 dx = float2(dxdy.x, 0.0);
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const float2 sample0_uv = sample5_uv - dxdy;
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const float2 sample10_uv = sample5_uv + dxdy;
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const float2 sample15_uv = sample5_uv + 2.0 * dxdy;
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const float2 sample1_uv = sample0_uv + dx;
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const float2 sample2_uv = sample0_uv + 2.0 * dx;
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const float2 sample3_uv = sample0_uv + 3.0 * dx;
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const float2 sample4_uv = sample5_uv - dx;
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const float2 sample6_uv = sample5_uv + dx;
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const float2 sample7_uv = sample5_uv + 2.0 * dx;
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const float2 sample8_uv = sample10_uv - 2.0 * dx;
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const float2 sample9_uv = sample10_uv - dx;
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const float2 sample11_uv = sample10_uv + dx;
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const float2 sample12_uv = sample15_uv - 3.0 * dx;
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const float2 sample13_uv = sample15_uv - 2.0 * dx;
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const float2 sample14_uv = sample15_uv - dx;
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// Load each sample:
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float3 sample0 = tex2D_linearize(tex, sample0_uv).rgb;
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float3 sample1 = tex2D_linearize(tex, sample1_uv).rgb;
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float3 sample2 = tex2D_linearize(tex, dx).rgb;
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float3 sample3 = tex2D_linearize(tex, sample3_uv).rgb;
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float3 sample4 = tex2D_linearize(tex, sample4_uv).rgb;
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float3 sample5 = tex2D_linearize(tex, sample5_uv).rgb;
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float3 sample6 = tex2D_linearize(tex, sample6_uv).rgb;
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float3 sample7 = tex2D_linearize(tex, sample7_uv).rgb;
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float3 sample8 = tex2D_linearize(tex, sample8_uv).rgb;
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float3 sample9 = tex2D_linearize(tex, sample9_uv).rgb;
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float3 sample10 = tex2D_linearize(tex, sample10_uv).rgb;
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float3 sample11 = tex2D_linearize(tex, sample11_uv).rgb;
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float3 sample12 = tex2D_linearize(tex, sample12_uv).rgb;
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float3 sample13 = tex2D_linearize(tex, sample13_uv).rgb;
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float3 sample14 = tex2D_linearize(tex, sample14_uv).rgb;
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float3 sample15 = tex2D_linearize(tex, sample15_uv).rgb;
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// Compute destination pixel offsets for each sample:
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const float2 dest_pixel = tex_uv * tex_uv_to_pixel_scale;
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const float2 sample0_offset = sample0_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample1_offset = sample1_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample2_offset = sample2_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample3_offset = sample3_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample4_offset = sample4_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample5_offset = sample5_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample6_offset = sample6_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample7_offset = sample7_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample8_offset = sample8_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample9_offset = sample9_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample10_offset = sample10_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample11_offset = sample11_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample12_offset = sample12_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample13_offset = sample13_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample14_offset = sample14_uv * tex_uv_to_pixel_scale - dest_pixel;
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const float2 sample15_offset = sample15_uv * tex_uv_to_pixel_scale - dest_pixel;
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// Compute Gaussian sample weights:
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const float w0 = exp(-LENGTH_SQ(sample0_offset) * denom_inv);
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const float w1 = exp(-LENGTH_SQ(sample1_offset) * denom_inv);
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const float w2 = exp(-LENGTH_SQ(sample2_offset) * denom_inv);
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const float w3 = exp(-LENGTH_SQ(sample3_offset) * denom_inv);
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const float w4 = exp(-LENGTH_SQ(sample4_offset) * denom_inv);
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const float w5 = exp(-LENGTH_SQ(sample5_offset) * denom_inv);
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const float w6 = exp(-LENGTH_SQ(sample6_offset) * denom_inv);
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const float w7 = exp(-LENGTH_SQ(sample7_offset) * denom_inv);
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const float w8 = exp(-LENGTH_SQ(sample8_offset) * denom_inv);
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const float w9 = exp(-LENGTH_SQ(sample9_offset) * denom_inv);
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const float w10 = exp(-LENGTH_SQ(sample10_offset) * denom_inv);
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const float w11 = exp(-LENGTH_SQ(sample11_offset) * denom_inv);
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const float w12 = exp(-LENGTH_SQ(sample12_offset) * denom_inv);
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const float w13 = exp(-LENGTH_SQ(sample13_offset) * denom_inv);
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const float w14 = exp(-LENGTH_SQ(sample14_offset) * denom_inv);
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const float w15 = exp(-LENGTH_SQ(sample15_offset) * denom_inv);
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const float weight_sum_inv = 1.0/(
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w0 + w1 + w2 + w3 + w4 + w5 + w6 + w7 +
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w8 +w9 + w10 + w11 + w12 + w13 + w14 + w15);
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// Weight and sum the samples:
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const float3 sum = w0 * sample0 + w1 * sample1 + w2 * sample2 + w3 * sample3 +
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w4 * sample4 + w5 * sample5 + w6 * sample6 + w7 * sample7 +
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w8 * sample8 + w9 * sample9 + w10 * sample10 + w11 * sample11 +
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w12 * sample12 + w13 * sample13 + w14 * sample14 + w15 * sample15;
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return sum * weight_sum_inv;
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}
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void main()
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{
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// Would a viewport-relative size work better for this pass? (No.)
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// PROS:
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// 1.) Instead of writing an absolute size to user-cgp-constants.h, we'd
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// write a viewport scale. That number could be used to directly scale
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// the viewport-resolution bloom sigma and/or triad size to a smaller
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// scale. This way, we could calculate an optimal dynamic sigma no
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// matter how the dot pitch is specified.
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// CONS:
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// 1.) Texel smearing would be much worse at small viewport sizes, but
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// performance would be much worse at large viewport sizes, so there
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// would be no easy way to calculate a decent scale.
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// 2.) Worse, we could no longer get away with using a constant-size blur!
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// Instead, we'd have to face all the same difficulties as the real
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// phosphor bloom, which requires static #ifdefs to decide the blur
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// size based on the expected triad size...a dynamic value.
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// 3.) Like the phosphor bloom, we'd have less control over making the blur
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// size correct for an optical blur. That said, we likely overblur (to
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// maintain brightness) more than the eye would do by itself: 20/20
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// human vision distinguishes ~1 arc minute, or 1/60 of a degree. The
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// highest viewing angle recommendation I know of is THX's 40.04 degree
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// recommendation, at which 20/20 vision can distinguish about 2402.4
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// lines. Assuming the "TV lines" definition, that means 1201.2
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// distinct light lines and 1201.2 distinct dark lines can be told
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// apart, i.e. 1201.2 pairs of lines. This would correspond to 1201.2
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// pairs of alternating lit/unlit phosphors, so 2402.4 phosphors total
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// (if they're alternately lit). That's a max of 800.8 triads. Using
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// a more popular 30 degree viewing angle recommendation, 20/20 vision
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// can distinguish 1800 lines, or 600 triads of alternately lit
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// phosphors. In contrast, we currently blur phosphors all the way
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// down to 341.3 triads to ensure full brightness.
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// 4.) Realistically speaking, we're usually just going to use bilinear
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// filtering in this pass anyway, but it only works well to limit
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// bandwidth if it's done at a small constant scale.
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// Get the constants we need to sample:
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// const sampler2D texture = ORIG_LINEARIZED.texture;
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// const float2 tex_uv = tex_uv;
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// const float2 blur_dxdy = blur_dxdy;
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const float2 texture_size_ = ORIG_LINEARIZEDtexture_size;
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// const float2 texture_size_inv = texture_size_inv;
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// const float2 tex_uv_to_pixel_scale = tex_uv_to_pixel_scale;
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float2 tex_uv_r, tex_uv_g, tex_uv_b;
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if(beam_misconvergence)
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{
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const float2 uv_scanline_step = uv_scanline_step;
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const float2 convergence_offsets_r = get_convergence_offsets_r_vector();
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const float2 convergence_offsets_g = get_convergence_offsets_g_vector();
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const float2 convergence_offsets_b = get_convergence_offsets_b_vector();
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tex_uv_r = tex_uv - convergence_offsets_r * uv_scanline_step;
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tex_uv_g = tex_uv - convergence_offsets_g * uv_scanline_step;
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tex_uv_b = tex_uv - convergence_offsets_b * uv_scanline_step;
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}
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// Get the blur sigma:
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const float bloom_approx_sigma = get_bloom_approx_sigma(IN.output_size.x,
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estimated_viewport_size_x);
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// Sample the resized and blurred texture, and apply convergence offsets if
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// necessary. Applying convergence offsets here triples our samples from
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// 16/9/1 to 48/27/3, but faster and easier than sampling BLOOM_APPROX and
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// HALATION_BLUR 3 times at full resolution every time they're used.
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float3 color_r, color_g, color_b, color;
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if(bloom_approx_filter > 1.5)
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{
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// Use a 4x4 Gaussian resize. This is slower but technically correct.
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if(beam_misconvergence)
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{
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color_r = tex2Dresize_gaussian4x4(ORIG_LINEARIZED, tex_uv_r,
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blur_dxdy, texture_size_, texture_size_inv,
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tex_uv_to_pixel_scale, bloom_approx_sigma);
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color_g = tex2Dresize_gaussian4x4(ORIG_LINEARIZED, tex_uv_g,
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blur_dxdy, texture_size_, texture_size_inv,
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tex_uv_to_pixel_scale, bloom_approx_sigma);
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color_b = tex2Dresize_gaussian4x4(ORIG_LINEARIZED, tex_uv_b,
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blur_dxdy, texture_size_, texture_size_inv,
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tex_uv_to_pixel_scale, bloom_approx_sigma);
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}
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else
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{
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color = tex2Dresize_gaussian4x4(ORIG_LINEARIZED, tex_uv,
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blur_dxdy, texture_size_, texture_size_inv,
|
|
tex_uv_to_pixel_scale, bloom_approx_sigma);
|
|
}
|
|
}
|
|
else if(bloom_approx_filter > 0.5)
|
|
{
|
|
// Use a 3x3 resize blur. This is the softest option, because we're
|
|
// blurring already blurry bilinear samples. It doesn't play quite as
|
|
// nicely with convergence offsets, but it has its charms.
|
|
if(beam_misconvergence)
|
|
{
|
|
color_r = tex2Dblur3x3resize(ORIG_LINEARIZED, tex_uv_r,
|
|
blur_dxdy, bloom_approx_sigma);
|
|
color_g = tex2Dblur3x3resize(ORIG_LINEARIZED, tex_uv_g,
|
|
blur_dxdy, bloom_approx_sigma);
|
|
color_b = tex2Dblur3x3resize(ORIG_LINEARIZED, tex_uv_b,
|
|
blur_dxdy, bloom_approx_sigma);
|
|
}
|
|
else
|
|
{
|
|
color = tex2Dblur3x3resize(ORIG_LINEARIZED, tex_uv, blur_dxdy);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// Use bilinear sampling. This approximates a 4x4 Gaussian resize MUCH
|
|
// better than tex2Dblur3x3_resize for the very small sigmas we're
|
|
// likely to use at small output resolutions. (This estimate becomes
|
|
// too sharp above ~400x300, but the blurs break down above that
|
|
// resolution too, unless min_allowed_viewport_triads is high enough to
|
|
// keep bloom_approx_scale_x/min_allowed_viewport_triads < ~1.1658025.)
|
|
if(beam_misconvergence)
|
|
{
|
|
color_r = tex2D_linearize(ORIG_LINEARIZED, tex_uv_r).rgb;
|
|
color_g = tex2D_linearize(ORIG_LINEARIZED, tex_uv_g).rgb;
|
|
color_b = tex2D_linearize(ORIG_LINEARIZED, tex_uv_b).rgb;
|
|
}
|
|
else
|
|
{
|
|
color = tex2D_linearize(ORIG_LINEARIZED, tex_uv).rgb;
|
|
}
|
|
}
|
|
// Pack the colors from the red/green/blue beams into a single vector:
|
|
if(beam_misconvergence)
|
|
{
|
|
color = float3(color_r.r, color_g.g, color_b.b);
|
|
}
|
|
// Encode and output the blurred image:
|
|
FragColor = encode_output(float4(tex2D_linearize(ORIG_LINEARIZED, tex_uv)));
|
|
} |