Add Retro-V3 shaders

- Add Retro-V3 shader
- Add Retro-V3-nds-colors and Retro-V2-nds-colors

handheld/retro-v2-nds-color.slangp

@@ -0,0 +1,9 @@
+shaders = 2
+
+shader0 = "shaders/retro-v2.slang"
+filter_linear0 = "false"
+scale_type0 = "viewport"
+
+shader1 = "shaders/color/nds-color.slang"
+filter_linear1 = "false"
+

handheld/retro-v3-nds-color.slangp

@@ -0,0 +1,9 @@
+shaders = 2
+
+shader0 = "shaders/retro-v3.slang"
+filter_linear0 = "false"
+scale_type0 = "viewport"
+
+shader1 = "shaders/color/nds-color.slang"
+filter_linear1 = "false"
+

handheld/retro-v3.slangp

@@ -0,0 +1,4 @@
+shaders = 1
+
+shader0 = shaders/retro-v3.slang
+filter_linear0 = false

handheld/shaders/retro-v2.slang

@@ -24,10 +24,18 @@
 layout(push_constant) uniform Push
 {
     float RETRO_PIXEL_SIZE;
+    float RETRO_COLOR_BOOST;
+    float RETRO_GAMMA_IN;
+    float RETRO_GAMMA_OUT;
 } param;
 
 // This value must be between 0.0 (totally black) and 1.0 (nearest neighbor)
-#pragma parameter RETRO_PIXEL_SIZE "Retro Pixel Size" 0.84 0.0 1.0 0.01
+#pragma parameter RETRO_PIXEL_SIZE "Retro Pixel Size"   0.84 0.5 1.0 0.01
+#pragma parameter RETRO_COLOR_BOOST "Retro Color Boost" 1.0 1.0 2.0 0.01
+#pragma parameter RETRO_GAMMA_IN "Retro Gamma In"       2.20 1.0 3.0 0.05
+#pragma parameter RETRO_GAMMA_OUT "Retro Gamma LCD"     2.20 1.0 3.0 0.05
+
+#define GAMMA_OUT  (1.0 / param.RETRO_GAMMA_OUT)
 
 layout(std140, set = 0, binding = 0) uniform UBO
 {
@@ -48,7 +56,7 @@ layout(location = 0) out vec2 vTexCoord;
 void main()
 {
     gl_Position = global.MVP * Position;
-    vTexCoord   = TexCoord;
+    vTexCoord   = TexCoord * 1.0001;
 }
 
 #pragma stage fragment
@@ -62,7 +70,7 @@ layout(set = 0, binding = 2) uniform sampler2D Source;
 void main()
 {
     // Reading the texel
-    vec3 E = pow(texture(Source, vTexCoord).xyz, vec3(2.4));
+    vec3 E = pow(texture(Source, vTexCoord).xyz, vec3(param.RETRO_GAMMA_IN));
 
     vec2 fp = fract(vTexCoord*global.SourceSize.xy);
     vec2 ps = global.SourceSize.xy * global.OutputSize.zw;
@@ -74,5 +82,5 @@ void main()
     vec3 res = mix(E*(1.04+fp.x*fp.y), E*0.36, max_coord);
 
     // Product interpolation
-    FragColor = vec4(clamp( pow(res, vec3(1.0 / 2.2)), 0.0, 1.0 ), 1.0);
+    FragColor = vec4(clamp( pow(param.RETRO_COLOR_BOOST*res, vec3(GAMMA_OUT)), 0.0, 1.0 ), 1.0);
 }

handheld/shaders/retro-v3.slang

@@ -0,0 +1,95 @@
+#version 450
+
+/*
+   Hyllian - Retro Shader - 2022
+
+   A re-implementation from the original made by Hyllian and DOLLS!
+   
+   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 (at your option) 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.
+
+*/
+
+layout(push_constant) uniform Push
+{
+    float RETRO_PIXEL_SIZE;
+    float RETRO_COLOR_BOOST;
+    float RETRO_GAMMA_IN;
+    float RETRO_GAMMA_OUT;
+} param;
+
+// This value must be between 0.0 (totally black) and 1.0 (nearest neighbor)
+#pragma parameter RETRO_PIXEL_SIZE "Retro Pixel Size" 0.50 0.0 1.0 0.01
+#pragma parameter RETRO_COLOR_BOOST "Retro Color Boost" 1.36 1.0 2.0 0.01
+#pragma parameter RETRO_GAMMA_IN "Retro Gamma In" 2.20 1.0 3.0 0.05
+#pragma parameter RETRO_GAMMA_OUT "Retro Gamma LCD" 2.20 1.0 3.0 0.05
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+    mat4 MVP;
+    vec4 OutputSize;
+    vec4 OriginalSize;
+    vec4 SourceSize;
+} global;
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+
+/*
+    VERTEX_SHADER
+*/
+void main()
+{
+    gl_Position = global.MVP * Position;
+    vTexCoord   = TexCoord * 1.0001;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+
+/*
+    FRAGMENT SHADER
+*/
+void main()
+{
+	vec2 p = vTexCoord.xy;
+
+	p = p * global.SourceSize.xy + vec2(0.5, 0.5);
+
+	vec2 i = floor(p);
+	vec2 f = p - i;
+	f = f * f * f * (f * (f * 6.0 - vec2(15.0, 15.0)) + vec2(10.0, 10.0));
+	p = i + f;
+
+	p = (p - vec2(0.5, 0.5)) * global.SourceSize.zw;
+
+    vec3 E = pow(texture(Source, p).xyz, vec3(param.RETRO_GAMMA_IN));
+
+    vec2 fp = fract(p*global.SourceSize.xy);
+    vec2 ps = global.SourceSize.xy * global.OutputSize.zw;
+
+    vec2 fr = clamp(clamp(fp + 0.5*ps, 0.0, 1.0) - param.RETRO_PIXEL_SIZE, vec2(0.0), ps)/ps;
+
+    float max_coord =  max(fr.x, fr.y);
+
+    vec3 res = mix(E*(1.04+fp.x*fp.y), E*0.36, max_coord);
+
+    // Product interpolation
+    FragColor = vec4(clamp( pow(param.RETRO_COLOR_BOOST*res, vec3(1.0 / param.RETRO_GAMMA_OUT)), 0.0, 1.0 ), 1.0);
+
+}