bf1b023f12
- A new port of crt-royale. More faithful to original. It uses the same mask textures. - The only thing not ported is the original geometry pass. It was replaced by geom curvature code. - It's configured for 1080p displays. 4k displays need to adjust param mask_triad_size_desired from 3.0 to 4.0. OBS: It's up to you decide if the two versions should be maintained.
364 lines
19 KiB
HLSL
364 lines
19 KiB
HLSL
///////////////////////////// GPL LICENSE NOTICE /////////////////////////////
|
|
|
|
// crt-royale: A full-featured CRT shader, with cheese.
|
|
// Copyright (C) 2014 TroggleMonkey <trogglemonkey@gmx.com>
|
|
//
|
|
// This program is free software; you can redistribute it and/or modify it
|
|
// under the terms of the GNU General Public License as published by the Free
|
|
// Software Foundation; either version 2 of the License, or any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful, but WITHOUT
|
|
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
// more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License along with
|
|
// this program; if not, write to the Free Software Foundation, Inc., 59 Temple
|
|
// Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
|
|
////////////////////////////////// INCLUDES //////////////////////////////////
|
|
|
|
#define ORIG_LINEARIZEDvideo_size VERTICAL_SCANLINES_texture_size
|
|
#define ORIG_LINEARIZEDtexture_size VERTICAL_SCANLINES_video_size
|
|
|
|
#define bloom_approx_scale_x (4.0/3.0)
|
|
static const float max_viewport_size_x = 1080.0*1024.0*(4.0/3.0);
|
|
|
|
#include "../include/user-settings.fxh"
|
|
#include "../include/derived-settings-and-constants.fxh"
|
|
#include "../include/bind-shader-params.fxh"
|
|
#include "../include/gamma-management.fxh"
|
|
#include "../include/blur-functions.fxh"
|
|
#include "../include/scanline-functions.fxh"
|
|
#include "../include/bloom-functions.fxh"
|
|
|
|
/////////////////////////////////// HELPERS //////////////////////////////////
|
|
|
|
float3 tex2Dresize_gaussian4x4(const sampler2D tex, const float2 tex_uv,
|
|
const float2 dxdy, const float2 texture_size, const float2 texture_size_inv,
|
|
const float2 tex_uv_to_pixel_scale, const float sigma)
|
|
{
|
|
// Requires: 1.) All requirements of gamma-management.h must be satisfied!
|
|
// 2.) filter_linearN must == "true" in your .cgp preset.
|
|
// 3.) mipmap_inputN must == "true" in your .cgp preset if
|
|
// IN.output_size << SRC.video_size.
|
|
// 4.) dxdy should contain the uv pixel spacing:
|
|
// dxdy = max(float2(1.0),
|
|
// SRC.video_size/IN.output_size)/SRC.texture_size;
|
|
// 5.) texture_size == SRC.texture_size
|
|
// 6.) texture_size_inv == float2(1.0)/SRC.texture_size
|
|
// 7.) tex_uv_to_pixel_scale == IN.output_size *
|
|
// SRC.texture_size / SRC.video_size;
|
|
// 8.) sigma is the desired Gaussian standard deviation, in
|
|
// terms of output pixels. It should be < ~0.66171875 to
|
|
// ensure the first unused sample (outside the 4x4 box) has
|
|
// a weight < 1.0/256.0.
|
|
// Returns: A true 4x4 Gaussian resize of the input.
|
|
// Description:
|
|
// Given correct inputs, this Gaussian resizer samples 4 pixel locations
|
|
// along each downsized dimension and/or 4 texel locations along each
|
|
// upsized dimension. It computes dynamic weights based on the pixel-space
|
|
// distance of each sample from the destination pixel. It is arbitrarily
|
|
// resizable and higher quality than tex2Dblur3x3_resize, but it's slower.
|
|
// TODO: Move this to a more suitable file once there are others like it.
|
|
const float denom_inv = 0.5/(sigma*sigma);
|
|
// We're taking 4x4 samples, and we're snapping to texels for upsizing.
|
|
// Find texture coords for sample 5 (second row, second column):
|
|
const float2 curr_texel = tex_uv * texture_size;
|
|
const float2 prev_texel =
|
|
floor(curr_texel - under_half.xx) + 0.5.xx;
|
|
const float2 prev_texel_uv = prev_texel * texture_size_inv;
|
|
const float2 snap = float2(dxdy <= texture_size_inv);
|
|
const float2 sample5_downsize_uv = tex_uv - 0.5 * dxdy;
|
|
const float2 sample5_uv = lerp(sample5_downsize_uv, prev_texel_uv, snap);
|
|
// Compute texture coords for other samples:
|
|
const float2 dx = float2(dxdy.x, 0.0);
|
|
const float2 sample0_uv = sample5_uv - dxdy;
|
|
const float2 sample10_uv = sample5_uv + dxdy;
|
|
const float2 sample15_uv = sample5_uv + 2.0 * dxdy;
|
|
const float2 sample1_uv = sample0_uv + dx;
|
|
const float2 sample2_uv = sample0_uv + 2.0 * dx;
|
|
const float2 sample3_uv = sample0_uv + 3.0 * dx;
|
|
const float2 sample4_uv = sample5_uv - dx;
|
|
const float2 sample6_uv = sample5_uv + dx;
|
|
const float2 sample7_uv = sample5_uv + 2.0 * dx;
|
|
const float2 sample8_uv = sample10_uv - 2.0 * dx;
|
|
const float2 sample9_uv = sample10_uv - dx;
|
|
const float2 sample11_uv = sample10_uv + dx;
|
|
const float2 sample12_uv = sample15_uv - 3.0 * dx;
|
|
const float2 sample13_uv = sample15_uv - 2.0 * dx;
|
|
const float2 sample14_uv = sample15_uv - dx;
|
|
// Load each sample:
|
|
const float3 sample0 = tex2D_linearize(tex, sample0_uv).rgb;
|
|
const float3 sample1 = tex2D_linearize(tex, sample1_uv).rgb;
|
|
const float3 sample2 = tex2D_linearize(tex, sample2_uv).rgb;
|
|
const float3 sample3 = tex2D_linearize(tex, sample3_uv).rgb;
|
|
const float3 sample4 = tex2D_linearize(tex, sample4_uv).rgb;
|
|
const float3 sample5 = tex2D_linearize(tex, sample5_uv).rgb;
|
|
const float3 sample6 = tex2D_linearize(tex, sample6_uv).rgb;
|
|
const float3 sample7 = tex2D_linearize(tex, sample7_uv).rgb;
|
|
const float3 sample8 = tex2D_linearize(tex, sample8_uv).rgb;
|
|
const float3 sample9 = tex2D_linearize(tex, sample9_uv).rgb;
|
|
const float3 sample10 = tex2D_linearize(tex, sample10_uv).rgb;
|
|
const float3 sample11 = tex2D_linearize(tex, sample11_uv).rgb;
|
|
const float3 sample12 = tex2D_linearize(tex, sample12_uv).rgb;
|
|
const float3 sample13 = tex2D_linearize(tex, sample13_uv).rgb;
|
|
const float3 sample14 = tex2D_linearize(tex, sample14_uv).rgb;
|
|
const float3 sample15 = tex2D_linearize(tex, sample15_uv).rgb;
|
|
// Compute destination pixel offsets for each sample:
|
|
const float2 dest_pixel = tex_uv * tex_uv_to_pixel_scale;
|
|
const float2 sample0_offset = sample0_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample1_offset = sample1_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample2_offset = sample2_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample3_offset = sample3_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample4_offset = sample4_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample5_offset = sample5_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample6_offset = sample6_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample7_offset = sample7_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample8_offset = sample8_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample9_offset = sample9_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample10_offset = sample10_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample11_offset = sample11_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample12_offset = sample12_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample13_offset = sample13_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample14_offset = sample14_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
const float2 sample15_offset = sample15_uv * tex_uv_to_pixel_scale - dest_pixel;
|
|
// Compute Gaussian sample weights:
|
|
const float w0 = exp(-LENGTH_SQ(sample0_offset) * denom_inv);
|
|
const float w1 = exp(-LENGTH_SQ(sample1_offset) * denom_inv);
|
|
const float w2 = exp(-LENGTH_SQ(sample2_offset) * denom_inv);
|
|
const float w3 = exp(-LENGTH_SQ(sample3_offset) * denom_inv);
|
|
const float w4 = exp(-LENGTH_SQ(sample4_offset) * denom_inv);
|
|
const float w5 = exp(-LENGTH_SQ(sample5_offset) * denom_inv);
|
|
const float w6 = exp(-LENGTH_SQ(sample6_offset) * denom_inv);
|
|
const float w7 = exp(-LENGTH_SQ(sample7_offset) * denom_inv);
|
|
const float w8 = exp(-LENGTH_SQ(sample8_offset) * denom_inv);
|
|
const float w9 = exp(-LENGTH_SQ(sample9_offset) * denom_inv);
|
|
const float w10 = exp(-LENGTH_SQ(sample10_offset) * denom_inv);
|
|
const float w11 = exp(-LENGTH_SQ(sample11_offset) * denom_inv);
|
|
const float w12 = exp(-LENGTH_SQ(sample12_offset) * denom_inv);
|
|
const float w13 = exp(-LENGTH_SQ(sample13_offset) * denom_inv);
|
|
const float w14 = exp(-LENGTH_SQ(sample14_offset) * denom_inv);
|
|
const float w15 = exp(-LENGTH_SQ(sample15_offset) * denom_inv);
|
|
const float weight_sum_inv = 1.0/(
|
|
w0 + w1 + w2 + w3 + w4 + w5 + w6 + w7 +
|
|
w8 +w9 + w10 + w11 + w12 + w13 + w14 + w15);
|
|
// Weight and sum the samples:
|
|
const float3 sum = w0 * sample0 + w1 * sample1 + w2 * sample2 + w3 * sample3 +
|
|
w4 * sample4 + w5 * sample5 + w6 * sample6 + w7 * sample7 +
|
|
w8 * sample8 + w9 * sample9 + w10 * sample10 + w11 * sample11 +
|
|
w12 * sample12 + w13 * sample13 + w14 * sample14 + w15 * sample15;
|
|
return sum * weight_sum_inv;
|
|
}
|
|
|
|
///////////////////////////////// STRUCTURES /////////////////////////////////
|
|
|
|
struct out_vertex_p2
|
|
{
|
|
float2 tex_uv : TEXCOORD1;
|
|
float2 blur_dxdy : TEXCOORD2;
|
|
float2 uv_scanline_step : TEXCOORD3;
|
|
float estimated_viewport_size_x : TEXCOORD4;
|
|
float2 texture_size_inv : TEXCOORD5;
|
|
float2 tex_uv_to_pixel_scale : TEXCOORD6;
|
|
float2 output_size : TEXCOORD7;
|
|
};
|
|
|
|
|
|
|
|
//////////////////////////////// VERTEX SHADER ///////////////////////////////
|
|
|
|
// Vertex shader generating a triangle covering the entire screen
|
|
void VS_Bloom_Approx(in uint id : SV_VertexID, out float4 position : SV_Position, out float2 texcoord : TEXCOORD, out out_vertex_p2 OUT)
|
|
{
|
|
texcoord.x = (id == 2) ? 2.0 : 0.0;
|
|
texcoord.y = (id == 1) ? 2.0 : 0.0;
|
|
position = float4(texcoord * float2(2.0, -2.0) + float2(-1.0, 1.0), 0.0, 1.0);
|
|
|
|
float2 texture_size = BLOOM_APPROX_texture_size;
|
|
float2 output_size = VIEWPORT_SIZE;
|
|
|
|
OUT.output_size = output_size;
|
|
|
|
// This vertex shader copies blurs/vertex-shader-blur-one-pass-resize.h,
|
|
// except we're using a different source image.
|
|
const float2 video_uv = texcoord * texture_size/video_size;
|
|
OUT.tex_uv = video_uv * ORIG_LINEARIZEDvideo_size /
|
|
ORIG_LINEARIZEDtexture_size;
|
|
// The last pass (vertical scanlines) had a viewport y scale, so we can
|
|
// use it to calculate a better runtime sigma:
|
|
// OUT.estimated_viewport_size_x = video_size.y * geom_aspect_ratio_x/geom_aspect_ratio_y;
|
|
OUT.estimated_viewport_size_x = video_size.y * texture_size.x/texture_size.y;
|
|
|
|
// Get the uv sample distance between output pixels. We're using a resize
|
|
// blur, so arbitrary upsizing will be acceptable if filter_linearN =
|
|
// "true," and arbitrary downsizing will be acceptable if mipmap_inputN =
|
|
// "true" too. The blur will be much more accurate if a true 4x4 Gaussian
|
|
// resize is used instead of tex2Dblur3x3_resize (which samples between
|
|
// texels even for upsizing).
|
|
const float2 dxdy_min_scale = ORIG_LINEARIZEDvideo_size/output_size;
|
|
const float2 texture_size_inv = 1.0.xx/ORIG_LINEARIZEDtexture_size;
|
|
if(bloom_approx_filter > 1.5) // 4x4 true Gaussian resize
|
|
{
|
|
// For upsizing, we'll snap to texels and sample the nearest 4.
|
|
const float2 dxdy_scale = max(dxdy_min_scale, 1.0.xx);
|
|
OUT.blur_dxdy = dxdy_scale * texture_size_inv;
|
|
}
|
|
else
|
|
{
|
|
const float2 dxdy_scale = dxdy_min_scale;
|
|
OUT.blur_dxdy = dxdy_scale * texture_size_inv;
|
|
}
|
|
// tex2Dresize_gaussian4x4 needs to know a bit more than the other filters:
|
|
OUT.tex_uv_to_pixel_scale = output_size *
|
|
ORIG_LINEARIZEDtexture_size / ORIG_LINEARIZEDvideo_size;
|
|
OUT.texture_size_inv = texture_size_inv;
|
|
|
|
// Detecting interlacing again here lets us apply convergence offsets in
|
|
// this pass. il_step_multiple contains the (texel, scanline) step
|
|
// multiple: 1 for progressive, 2 for interlaced.
|
|
const float2 orig_video_size = ORIG_LINEARIZEDvideo_size;
|
|
const float y_step = 1.0 + float(is_interlaced(orig_video_size.y));
|
|
const float2 il_step_multiple = float2(1.0, y_step);
|
|
// Get the uv distance between (texels, same-field scanlines):
|
|
OUT.uv_scanline_step = il_step_multiple / ORIG_LINEARIZEDtexture_size;
|
|
}
|
|
|
|
|
|
/////////////////////////////// FRAGMENT SHADER //////////////////////////////
|
|
|
|
float4 PS_Bloom_Approx(float4 vpos: SV_Position, float2 vTexCoord : TEXCOORD, in out_vertex_p2 VAR) : SV_Target
|
|
{
|
|
// Would a viewport-relative size work better for this pass? (No.)
|
|
// PROS:
|
|
// 1.) Instead of writing an absolute size to user-cgp-constants.h, we'd
|
|
// write a viewport scale. That number could be used to directly scale
|
|
// the viewport-resolution bloom sigma and/or triad size to a smaller
|
|
// scale. This way, we could calculate an optimal dynamic sigma no
|
|
// matter how the dot pitch is specified.
|
|
// CONS:
|
|
// 1.) Texel smearing would be much worse at small viewport sizes, but
|
|
// performance would be much worse at large viewport sizes, so there
|
|
// would be no easy way to calculate a decent scale.
|
|
// 2.) Worse, we could no longer get away with using a constant-size blur!
|
|
// Instead, we'd have to face all the same difficulties as the real
|
|
// phosphor bloom, which requires static #ifdefs to decide the blur
|
|
// size based on the expected triad size...a dynamic value.
|
|
// 3.) Like the phosphor bloom, we'd have less control over making the blur
|
|
// size correct for an optical blur. That said, we likely overblur (to
|
|
// maintain brightness) more than the eye would do by itself: 20/20
|
|
// human vision distinguishes ~1 arc minute, or 1/60 of a degree. The
|
|
// highest viewing angle recommendation I know of is THX's 40.04 degree
|
|
// recommendation, at which 20/20 vision can distinguish about 2402.4
|
|
// lines. Assuming the "TV lines" definition, that means 1201.2
|
|
// distinct light lines and 1201.2 distinct dark lines can be told
|
|
// apart, i.e. 1201.2 pairs of lines. This would correspond to 1201.2
|
|
// pairs of alternating lit/unlit phosphors, so 2402.4 phosphors total
|
|
// (if they're alternately lit). That's a max of 800.8 triads. Using
|
|
// a more popular 30 degree viewing angle recommendation, 20/20 vision
|
|
// can distinguish 1800 lines, or 600 triads of alternately lit
|
|
// phosphors. In contrast, we currently blur phosphors all the way
|
|
// down to 341.3 triads to ensure full brightness.
|
|
// 4.) Realistically speaking, we're usually just going to use bilinear
|
|
// filtering in this pass anyway, but it only works well to limit
|
|
// bandwidth if it's done at a small constant scale.
|
|
|
|
// Get the constants we need to sample:
|
|
float2 output_size = VAR.output_size;
|
|
//const sampler2D Source = ORIG_LINEARIZED;
|
|
const float2 tex_uv = VAR.tex_uv;
|
|
const float2 blur_dxdy = VAR.blur_dxdy;
|
|
const float2 texture_size = ORIG_LINEARIZEDtexture_size;
|
|
const float2 texture_size_inv = VAR.texture_size_inv;
|
|
const float2 tex_uv_to_pixel_scale = VAR.tex_uv_to_pixel_scale;
|
|
float2 tex_uv_r, tex_uv_g, tex_uv_b;
|
|
if(beam_misconvergence)
|
|
{
|
|
const float2 uv_scanline_step = VAR.uv_scanline_step;
|
|
const float2 convergence_offsets_r = get_convergence_offsets_r_vector();
|
|
const float2 convergence_offsets_g = get_convergence_offsets_g_vector();
|
|
const float2 convergence_offsets_b = get_convergence_offsets_b_vector();
|
|
tex_uv_r = tex_uv - convergence_offsets_r * uv_scanline_step;
|
|
tex_uv_g = tex_uv - convergence_offsets_g * uv_scanline_step;
|
|
tex_uv_b = tex_uv - convergence_offsets_b * uv_scanline_step;
|
|
}
|
|
// Get the blur sigma:
|
|
const float bloom_approx_sigma = get_bloom_approx_sigma(output_size.x,
|
|
VAR.estimated_viewport_size_x);
|
|
|
|
// Sample the resized and blurred texture, and apply convergence offsets if
|
|
// necessary. Applying convergence offsets here triples our samples from
|
|
// 16/9/1 to 48/27/3, but faster and easier than sampling BLOOM_APPROX and
|
|
// HALATION_BLUR 3 times at full resolution every time they're used.
|
|
float3 color_r, color_g, color_b, color;
|
|
if(bloom_approx_filter > 1.5)
|
|
{
|
|
// Use a 4x4 Gaussian resize. This is slower but technically correct.
|
|
if(beam_misconvergence)
|
|
{
|
|
color_r = tex2Dresize_gaussian4x4(ORIG_LINEARIZED, tex_uv_r,
|
|
blur_dxdy, texture_size, texture_size_inv,
|
|
tex_uv_to_pixel_scale, bloom_approx_sigma);
|
|
color_g = tex2Dresize_gaussian4x4(ORIG_LINEARIZED, tex_uv_g,
|
|
blur_dxdy, texture_size, texture_size_inv,
|
|
tex_uv_to_pixel_scale, bloom_approx_sigma);
|
|
color_b = tex2Dresize_gaussian4x4(ORIG_LINEARIZED, tex_uv_b,
|
|
blur_dxdy, texture_size, texture_size_inv,
|
|
tex_uv_to_pixel_scale, bloom_approx_sigma);
|
|
}
|
|
else
|
|
{
|
|
color = tex2Dresize_gaussian4x4(ORIG_LINEARIZED, tex_uv,
|
|
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:
|
|
return encode_output(float4(color, 1.0));
|
|
}
|
|
|