Switched Anaglyph shader technique from Dubois to Rendepth

 (newer method optimized for LCD screens).

src/android/app/src/main/jni/config.cpp

@@ -161,7 +161,7 @@ void Config::ReadValues() {
     ReadSetting("Renderer", Settings::values.factor_3d);
     std::string default_shader = "none (builtin)";
     if (Settings::values.render_3d.GetValue() == Settings::StereoRenderOption::Anaglyph)
-        default_shader = "dubois (builtin)";
+        default_shader = "rendepth (builtin)";
     else if (Settings::values.render_3d.GetValue() == Settings::StereoRenderOption::Interlaced)
         default_shader = "horizontal (builtin)";
     Settings::values.pp_shader_name =

src/citra_qt/configuration/configure_enhancements.cpp

@@ -110,7 +110,7 @@ void ConfigureEnhancements::updateShaders(Settings::StereoRenderOption stereo_op
 
     std::string current_shader;
     if (stereo_option == Settings::StereoRenderOption::Anaglyph) {
-        ui->shader_combobox->addItem(QStringLiteral("dubois (builtin)"));
+        ui->shader_combobox->addItem(QStringLiteral("rendepth (builtin)"));
         current_shader = Settings::values.anaglyph_shader_name.GetValue();
     } else {
         ui->shader_combobox->addItem(QStringLiteral("none (builtin)"));

src/common/settings.h

@@ -514,7 +514,8 @@ struct Values {
 
     SwitchableSetting<bool> filter_mode{true, "filter_mode"};
     SwitchableSetting<std::string> pp_shader_name{"none (builtin)", "pp_shader_name"};
-    SwitchableSetting<std::string> anaglyph_shader_name{"dubois (builtin)", "anaglyph_shader_name"};
+    SwitchableSetting<std::string> anaglyph_shader_name{"rendepth (builtin)",
+                                                        "anaglyph_shader_name"};
 
     SwitchableSetting<bool> dump_textures{false, "dump_textures"};
     SwitchableSetting<bool> custom_textures{false, "custom_textures"};

src/video_core/host_shaders/opengl_present_anaglyph.frag

@@ -4,17 +4,22 @@
 
 //? #version 430 core
 
-// Anaglyph Red-Cyan shader based on Dubois algorithm
-// Constants taken from the paper:
-// "Conversion of a Stereo Pair to Anaglyph with
-// the Least-Squares Projection Method"
-// Eric Dubois, March 2009
-const mat3 l = mat3( 0.437, 0.449, 0.164,
-              -0.062,-0.062,-0.024,
-              -0.048,-0.050,-0.017);
-const mat3 r = mat3(-0.011,-0.032,-0.007,
-               0.377, 0.761, 0.009,
-              -0.026,-0.093, 1.234);
+// Rendepth: Red/Cyan Anaglyph Filter Optimized for Stereoscopic 3D on LCD Monitors by Andres Hernandez.
+// Based on the paper "Producing Anaglyphs from Synthetic Images" by William Sanders, David F. McAllister.
+// Using concepts from "Methods for computing color anaglyphs" by David F. McAllister, Ya Zhou, Sophia Sullivan.
+// Original research from "Conversion of a Stereo Pair to Anaglyph with the Least-Squares Projection Method" by Eric Dubois
+
+const mat3 l = mat3(
+    vec3(0.4561, 0.500484, 0.176381),
+    vec3(-0.400822, -0.0378246, -0.0157589),
+    vec3(-0.0152161, -0.0205971, -0.00546856));
+
+const mat3 r = mat3(
+    vec3(-0.0434706, -0.0879388, -0.00155529),
+    vec3(0.378476, 0.73364, -0.0184503),
+    vec3(-0.0721527, -0.112961, 1.2264));
+
+const vec3 g = vec3(1.6, 0.8, 1.0);
 
 layout(location = 0) in vec2 frag_tex_coord;
 layout(location = 0) out vec4 color;
@@ -25,8 +30,18 @@ layout(binding = 1) uniform sampler2D color_texture_r;
 uniform vec4 resolution;
 uniform int layer;
 
+vec3 correct_color(vec3 col) {
+    vec3 result;
+    result.r = pow(col.r, 1.0 / g.r);
+    result.g = pow(col.g, 1.0 / g.g);
+    result.b = pow(col.b, 1.0 / g.b);
+    return result;
+}
+
 void main() {
     vec4 color_tex_l = texture(color_texture, frag_tex_coord);
     vec4 color_tex_r = texture(color_texture_r, frag_tex_coord);
-    color = vec4(color_tex_l.rgb*l+color_tex_r.rgb*r, color_tex_l.a);
+    vec3 color_anaglyph = clamp(color_tex_l.rgb * l, vec3(0.0), vec3(1.0)) + clamp(color_tex_r.rgb * r, vec3(0.0), vec3(1.0));
+    vec3 color_corrected = correct_color(color_anaglyph);
+    color = vec4(color_corrected, color_tex_l.a);
 }

src/video_core/host_shaders/vulkan_present_anaglyph.frag

@@ -8,17 +8,22 @@
 layout (location = 0) in vec2 frag_tex_coord;
 layout (location = 0) out vec4 color;
 
-// Anaglyph Red-Cyan shader based on Dubois algorithm
-// Constants taken from the paper:
-// "Conversion of a Stereo Pair to Anaglyph with
-// the Least-Squares Projection Method"
-// Eric Dubois, March 2009
-const mat3 l = mat3( 0.437, 0.449, 0.164,
-              -0.062,-0.062,-0.024,
-              -0.048,-0.050,-0.017);
-const mat3 r = mat3(-0.011,-0.032,-0.007,
-               0.377, 0.761, 0.009,
-              -0.026,-0.093, 1.234);
+// Rendepth: Red/Cyan Anaglyph Filter Optimized for Stereoscopic 3D on LCD Monitors by Andres Hernandez.
+// Based on the paper "Producing Anaglyphs from Synthetic Images" by William Sanders, David F. McAllister.
+// Using concepts from "Methods for computing color anaglyphs" by David F. McAllister, Ya Zhou, Sophia Sullivan.
+// Original research from "Conversion of a Stereo Pair to Anaglyph with the Least-Squares Projection Method" by Eric Dubois
+
+const mat3 l = mat3(
+    vec3(0.4561, 0.500484, 0.176381),
+    vec3(-0.400822, -0.0378246, -0.0157589),
+    vec3(-0.0152161, -0.0205971, -0.00546856));
+
+const mat3 r = mat3(
+    vec3(-0.0434706, -0.0879388, -0.00155529),
+    vec3(0.378476, 0.73364, -0.0184503),
+    vec3(-0.0721527, -0.112961, 1.2264));
+
+const vec3 g = vec3(1.6, 0.8, 1.0);
 
 layout (push_constant, std140) uniform DrawInfo {
     mat4 modelview_matrix;
@@ -47,8 +52,18 @@ vec4 GetScreen(int screen_id) {
 #endif
 }
 
+vec3 correct_color(vec3 col) {
+    vec3 result;
+    result.r = pow(col.r, 1.0 / g.r);
+    result.g = pow(col.g, 1.0 / g.g);
+    result.b = pow(col.b, 1.0 / g.b);
+    return result;
+}
+
 void main() {
     vec4 color_tex_l = GetScreen(screen_id_l);
     vec4 color_tex_r = GetScreen(screen_id_r);
-    color = vec4(color_tex_l.rgb*l+color_tex_r.rgb*r, color_tex_l.a);
+    vec3 color_anaglyph = clamp(color_tex_l.rgb * l, vec3(0.0), vec3(1.0)) + clamp(color_tex_r.rgb * r, vec3(0.0), vec3(1.0));
+    vec3 color_corrected = correct_color(color_anaglyph);
+    color = vec4(color_corrected, color_tex_l.a);
 }

src/video_core/renderer_opengl/renderer_opengl.cpp

@@ -370,7 +370,7 @@ void RendererOpenGL::ReloadShader() {
     // Link shaders and get variable locations
     std::string shader_data = fragment_shader_precision_OES;
     if (Settings::values.render_3d.GetValue() == Settings::StereoRenderOption::Anaglyph) {
-        if (Settings::values.anaglyph_shader_name.GetValue() == "dubois (builtin)") {
+        if (Settings::values.anaglyph_shader_name.GetValue() == "rendepth (builtin)") {
             shader_data += HostShaders::OPENGL_PRESENT_ANAGLYPH_FRAG;
         } else {
             std::string shader_text = OpenGL::GetPostProcessingShaderCode(

src/video_core/renderer_vulkan/renderer_vulkan.cpp

@@ -65,6 +65,7 @@ RendererVulkan::RendererVulkan(Core::System& system, Pica::PicaCore& pica_,
     CompileShaders();
     BuildLayouts();
     BuildPipelines();
+    ReloadPipeline();
     if (secondary_window) {
         second_window = std::make_unique<PresentWindow>(*secondary_window, instance, scheduler);
     }