Renderers: Unify post processing filter shaders

src/video_core/host_shaders/CMakeLists.txt

@@ -6,15 +6,13 @@ set(SHADER_FILES
     convert_float_to_depth.frag
     full_screen_triangle.vert
     opengl_copy_bc4.comp
-    opengl_present_scaleforce.frag
-    opengl_present_bicubic.frag
     opengl_present.frag
     opengl_present.vert
     pitch_unswizzle.comp
+    present_scaleforce.frag
+    present_bicubic.frag
     vulkan_blit_color_float.frag
     vulkan_blit_depth_stencil.frag
-    vulkan_present_bicubic.frag
-    vulkan_present_scaleforce.frag
     vulkan_present.frag
     vulkan_present.vert
     vulkan_quad_indexed.comp

src/video_core/host_shaders/opengl_present_scaleforce.frag

@@ -1,135 +0,0 @@
-// from https://github.com/BreadFish64/ScaleFish/tree/master/scale_force
-
-// MIT License
-//
-// Copyright (c) 2020 BreadFish64
-//
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-//
-// The above copyright notice and this permission notice shall be included in all
-// copies or substantial portions of the Software.
-//
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-// SOFTWARE.
-
-precision mediump float;
-
-layout (location = 0) in vec2 tex_coord;
-
-layout (location = 0) out vec4 frag_color;
-
-layout (binding = 1) uniform sampler2D input_texture;
-
-vec2 tex_size;
-vec2 inv_tex_size;
-
-vec4 cubic(float v) {
-    vec3 n = vec3(1.0, 2.0, 3.0) - v;
-    vec3 s = n * n * n;
-    float x = s.x;
-    float y = s.y - 4.0 * s.x;
-    float z = s.z - 4.0 * s.y + 6.0 * s.x;
-    float w = 6.0 - x - y - z;
-    return vec4(x, y, z, w) / 6.0;
-}
-
-// Bicubic interpolation
-vec4 textureBicubic(vec2 tex_coords) {
-    tex_coords = tex_coords * tex_size - 0.5;
-
-    vec2 fxy = modf(tex_coords, tex_coords);
-
-    vec4 xcubic = cubic(fxy.x);
-    vec4 ycubic = cubic(fxy.y);
-
-    vec4 c = tex_coords.xxyy + vec2(-0.5, +1.5).xyxy;
-
-    vec4 s = vec4(xcubic.xz + xcubic.yw, ycubic.xz + ycubic.yw);
-    vec4 offset = c + vec4(xcubic.yw, ycubic.yw) / s;
-
-    offset *= inv_tex_size.xxyy;
-
-    vec4 sample0 = textureLod(input_texture, offset.xz, 0.0);
-    vec4 sample1 = textureLod(input_texture, offset.yz, 0.0);
-    vec4 sample2 = textureLod(input_texture, offset.xw, 0.0);
-    vec4 sample3 = textureLod(input_texture, offset.yw, 0.0);
-
-    float sx = s.x / (s.x + s.y);
-    float sy = s.z / (s.z + s.w);
-
-    return mix(mix(sample3, sample2, sx), mix(sample1, sample0, sx), sy);
-}
-
-mat4x3 center_matrix;
-vec4 center_alpha;
-
-// Finds the distance between four colors and cc in YCbCr space
-vec4 ColorDist(vec4 A, vec4 B, vec4 C, vec4 D) {
-    // https://en.wikipedia.org/wiki/YCbCr#ITU-R_BT.2020_conversion
-    const vec3 K = vec3(0.2627, 0.6780, 0.0593);
-    const float LUMINANCE_WEIGHT = .6;
-    const mat3 YCBCR_MATRIX =
-        mat3(K * LUMINANCE_WEIGHT, -.5 * K.r / (1.0 - K.b), -.5 * K.g / (1.0 - K.b), .5, .5,
-             -.5 * K.g / (1.0 - K.r), -.5 * K.b / (1.0 - K.r));
-
-    mat4x3 colors = mat4x3(A.rgb, B.rgb, C.rgb, D.rgb) - center_matrix;
-    mat4x3 YCbCr = YCBCR_MATRIX * colors;
-    vec4 color_dist = vec3(1.0) * YCbCr;
-    color_dist *= color_dist;
-    vec4 alpha = vec4(A.a, B.a, C.a, D.a);
-
-    return sqrt((color_dist + abs(center_alpha - alpha)) * alpha * center_alpha);
-}
-
-void main() {
-    vec4 bl = textureLodOffset(input_texture, tex_coord, 0.0, ivec2(-1, -1));
-    vec4 bc = textureLodOffset(input_texture, tex_coord, 0.0, ivec2(0, -1));
-    vec4 br = textureLodOffset(input_texture, tex_coord, 0.0, ivec2(1, -1));
-    vec4 cl = textureLodOffset(input_texture, tex_coord, 0.0, ivec2(-1, 0));
-    vec4 cc = textureLod(input_texture, tex_coord, 0.0);
-    vec4 cr = textureLodOffset(input_texture, tex_coord, 0.0, ivec2(1, 0));
-    vec4 tl = textureLodOffset(input_texture, tex_coord, 0.0, ivec2(-1, 1));
-    vec4 tc = textureLodOffset(input_texture, tex_coord, 0.0, ivec2(0, 1));
-    vec4 tr = textureLodOffset(input_texture, tex_coord, 0.0, ivec2(1, 1));
-
-
-    tex_size = vec2(textureSize(input_texture, 0));
-    inv_tex_size = 1.0 / tex_size;
-    center_matrix = mat4x3(cc.rgb, cc.rgb, cc.rgb, cc.rgb);
-    center_alpha = cc.aaaa;
-
-    vec4 offset_tl = ColorDist(tl, tc, tr, cr);
-    vec4 offset_br = ColorDist(br, bc, bl, cl);
-
-    // Calculate how different cc is from the texels around it
-    float total_dist = dot(offset_tl + offset_br, vec4(1.0));
-
-    // Add together all the distances with direction taken into account
-    vec4 tmp = offset_tl - offset_br;
-    vec2 total_offset = tmp.wy + tmp.zz + vec2(-tmp.x, tmp.x);
-
-    if (total_dist == 0.0) {
-        // Doing bicubic filtering just past the edges where the offset is 0 causes black floaters
-        // and it doesn't really matter which filter is used when the colors aren't changing.
-        frag_color = vec4(cc.rgb, 1.0f);
-    } else {
-        // When the image has thin points, they tend to split apart.
-        // This is because the texels all around are different
-        // and total_offset reaches into clear areas.
-        // This works pretty well to keep the offset in bounds for these cases.
-        float clamp_val = length(total_offset) / total_dist;
-        vec2 final_offset = clamp(total_offset, -clamp_val, clamp_val) * inv_tex_size;
-
-        frag_color = vec4(textureBicubic(tex_coord - final_offset).rgb, 1.0f);
-    }
-}

src/video_core/host_shaders/opengl_present_bicubic.frag → src/video_core/host_shaders/present_bicubic.frag

@@ -4,11 +4,22 @@
 
 #version 460 core
 
+#ifdef VULKAN
+
+#define BINDING_COLOR_TEXTURE 1
+
+#else // ^^^ Vulkan ^^^ // vvv OpenGL vvv
+
+#define BINDING_COLOR_TEXTURE 0
+
+#endif
+
+
 layout (location = 0) in vec2 frag_tex_coord;
 
 layout (location = 0) out vec4 color;
 
-layout (binding = 1) uniform sampler2D color_texture;
+layout (binding = BINDING_COLOR_TEXTURE) uniform sampler2D color_texture;
 
 vec4 cubic(float v) {
     vec4 n = vec4(1.0, 2.0, 3.0, 4.0) - v;

src/video_core/host_shaders/vulkan_present_scaleforce.frag → src/video_core/host_shaders/present_scaleforce.frag

@@ -1,7 +1,3 @@
-#version 320 es
-
-// from https://github.com/BreadFish64/ScaleFish/tree/master/scale_force
-
 // MIT License
 //
 // Copyright (c) 2020 BreadFish64
@@ -24,13 +20,25 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 // SOFTWARE.
 
-precision mediump float;
+// Adapted from https://github.com/BreadFish64/ScaleFish/tree/master/scaleforce
+
+#version 460
+
+#ifdef VULKAN
+
+#define BINDING_COLOR_TEXTURE 1
+
+#else // ^^^ Vulkan ^^^ // vvv OpenGL vvv
+
+#define BINDING_COLOR_TEXTURE 0
+
+#endif
 
 layout (location = 0) in vec2 tex_coord;
 
 layout (location = 0) out vec4 frag_color;
 
-layout (binding = 1) uniform sampler2D input_texture;
+layout (binding = BINDING_COLOR_TEXTURE) uniform sampler2D input_texture;
 
 vec2 tex_size;
 vec2 inv_tex_size;

src/video_core/host_shaders/vulkan_present_bicubic.frag

@@ -1,56 +0,0 @@
-// Copyright 2019 yuzu Emulator Project
-// Licensed under GPLv2 or any later version
-// Refer to the license.txt file included.
-
-#version 460 core
-
-layout (location = 0) in vec2 frag_tex_coord;
-
-layout (location = 0) out vec4 color;
-
-layout (binding = 1) uniform sampler2D color_texture;
-
-vec4 cubic(float v) {
-    vec4 n = vec4(1.0, 2.0, 3.0, 4.0) - v;
-    vec4 s = n * n * n;
-    float x = s.x;
-    float y = s.y - 4.0 * s.x;
-    float z = s.z - 4.0 * s.y + 6.0 * s.x;
-    float w = 6.0 - x - y - z;
-    return vec4(x, y, z, w) * (1.0 / 6.0);
-}
-
-vec4 textureBicubic( sampler2D textureSampler, vec2 texCoords ) {
-
-    vec2 texSize = textureSize(textureSampler, 0);
-    vec2 invTexSize = 1.0 / texSize;
-
-    texCoords = texCoords * texSize - 0.5;
-
-    vec2 fxy = fract(texCoords);
-    texCoords -= fxy;
-
-    vec4 xcubic = cubic(fxy.x);
-    vec4 ycubic = cubic(fxy.y);
-
-    vec4 c = texCoords.xxyy + vec2(-0.5, +1.5).xyxy;
-
-    vec4 s = vec4(xcubic.xz + xcubic.yw, ycubic.xz + ycubic.yw);
-    vec4 offset = c + vec4(xcubic.yw, ycubic.yw) / s;
-
-    offset *= invTexSize.xxyy;
-
-    vec4 sample0 = texture(textureSampler, offset.xz);
-    vec4 sample1 = texture(textureSampler, offset.yz);
-    vec4 sample2 = texture(textureSampler, offset.xw);
-    vec4 sample3 = texture(textureSampler, offset.yw);
-
-    float sx = s.x / (s.x + s.y);
-    float sy = s.z / (s.z + s.w);
-
-    return mix(mix(sample3, sample2, sx), mix(sample1, sample0, sx), sy);
-}
-
-void main() {
-    color = vec4(textureBicubic(color_texture, frag_tex_coord).rgb, 1.0f);
-}

src/video_core/renderer_opengl/renderer_opengl.cpp

@@ -21,10 +21,10 @@
 #include "core/memory.h"
 #include "core/perf_stats.h"
 #include "core/telemetry_session.h"
-#include "video_core/host_shaders/opengl_present_bicubic_frag.h"
 #include "video_core/host_shaders/opengl_present_frag.h"
-#include "video_core/host_shaders/opengl_present_scaleforce_frag.h"
 #include "video_core/host_shaders/opengl_present_vert.h"
+#include "video_core/host_shaders/present_bicubic_frag.h"
+#include "video_core/host_shaders/present_scaleforce_frag.h"
 #include "video_core/renderer_opengl/gl_rasterizer.h"
 #include "video_core/renderer_opengl/gl_shader_manager.h"
 #include "video_core/renderer_opengl/gl_shader_util.h"
@@ -255,10 +255,9 @@ void RendererOpenGL::InitOpenGLObjects() {
     // Create shader programs
     present_vertex = CreateProgram(HostShaders::OPENGL_PRESENT_VERT, GL_VERTEX_SHADER);
     present_bilinear_fragment = CreateProgram(HostShaders::OPENGL_PRESENT_FRAG, GL_FRAGMENT_SHADER);
-    present_bicubic_fragment =
-        CreateProgram(HostShaders::OPENGL_PRESENT_BICUBIC_FRAG, GL_FRAGMENT_SHADER);
+    present_bicubic_fragment = CreateProgram(HostShaders::PRESENT_BICUBIC_FRAG, GL_FRAGMENT_SHADER);
     present_scaleforce_fragment =
-        CreateProgram(HostShaders::OPENGL_PRESENT_SCALEFORCE_FRAG, GL_FRAGMENT_SHADER);
+        CreateProgram(HostShaders::PRESENT_SCALEFORCE_FRAG, GL_FRAGMENT_SHADER);
 
     // Generate presentation sampler
     present_sampler.Create();

src/video_core/renderer_vulkan/vk_blit_screen.cpp

@@ -17,9 +17,9 @@
 #include "core/frontend/emu_window.h"
 #include "core/memory.h"
 #include "video_core/gpu.h"
-#include "video_core/host_shaders/vulkan_present_bicubic_frag_spv.h"
+#include "video_core/host_shaders/present_bicubic_frag_spv.h"
+#include "video_core/host_shaders/present_scaleforce_frag_spv.h"
 #include "video_core/host_shaders/vulkan_present_frag_spv.h"
-#include "video_core/host_shaders/vulkan_present_scaleforce_frag_spv.h"
 #include "video_core/host_shaders/vulkan_present_vert_spv.h"
 #include "video_core/renderer_vulkan/renderer_vulkan.h"
 #include "video_core/renderer_vulkan/vk_blit_screen.h"
@@ -342,8 +342,8 @@ void VKBlitScreen::RefreshResources(const Tegra::FramebufferConfig& framebuffer)
 void VKBlitScreen::CreateShaders() {
     vertex_shader = BuildShader(device, VULKAN_PRESENT_VERT_SPV);
     bilinear_fragment_shader = BuildShader(device, VULKAN_PRESENT_FRAG_SPV);
-    bicubic_fragment_shader = BuildShader(device, VULKAN_PRESENT_BICUBIC_FRAG_SPV);
-    scaleforce_fragment_shader = BuildShader(device, VULKAN_PRESENT_SCALEFORCE_FRAG_SPV);
+    bicubic_fragment_shader = BuildShader(device, PRESENT_BICUBIC_FRAG_SPV);
+    scaleforce_fragment_shader = BuildShader(device, PRESENT_SCALEFORCE_FRAG_SPV);
 }
 
 void VKBlitScreen::CreateSemaphores() {