From a450ac1b2f13735d3309c425a7bb2b37d121ef42 Mon Sep 17 00:00:00 2001
From: hunterk <hunter_kaller@yahoo.com>
Date: Tue, 14 Mar 2017 21:03:52 -0500
Subject: [PATCH] add crt-nes-mini

---
 crt/crt-nes-mini.slangp        |  3 ++
 crt/shaders/crt-nes-mini.slang | 50 ++++++++++++++++++++++++++++++++++
 2 files changed, 53 insertions(+)
 create mode 100644 crt/crt-nes-mini.slangp
 create mode 100644 crt/shaders/crt-nes-mini.slang

diff --git a/crt/crt-nes-mini.slangp b/crt/crt-nes-mini.slangp
new file mode 100644
index 0000000..591af6d
--- /dev/null
+++ b/crt/crt-nes-mini.slangp
@@ -0,0 +1,3 @@
+shaders = 1
+
+shader0 = shaders/crt-nes-mini.slang
diff --git a/crt/shaders/crt-nes-mini.slang b/crt/shaders/crt-nes-mini.slang
new file mode 100644
index 0000000..d73a3fd
--- /dev/null
+++ b/crt/shaders/crt-nes-mini.slang
@@ -0,0 +1,50 @@
+#version 450
+
+layout(push_constant) uniform Push
+{
+	vec4 SourceSize;
+	vec4 OriginalSize;
+	vec4 OutputSize;
+	uint FrameCount;
+	float BRIGHTBOOST;
+	float INTENSITY;
+	float SCANTHICK;
+} params;
+
+#pragma parameter SCANTHICK "Scanline Thickness" 2.0 2.0 4.0 2.0
+#pragma parameter INTENSITY "Scanline Intensity" 0.15 0.0 1.0 0.01
+#pragma parameter BRIGHTBOOST "Luminance Boost" 0.15 0.0 1.0 0.01
+
+layout(std140, set = 0, binding = 0) uniform UBO
+{
+	mat4 MVP;
+} global;
+
+#pragma stage vertex
+layout(location = 0) in vec4 Position;
+layout(location = 1) in vec2 TexCoord;
+layout(location = 0) out vec2 vTexCoord;
+
+void main()
+{
+   gl_Position = global.MVP * Position;
+   vTexCoord = TexCoord;
+}
+
+#pragma stage fragment
+layout(location = 0) in vec2 vTexCoord;
+layout(location = 0) out vec4 FragColor;
+layout(set = 0, binding = 2) uniform sampler2D Source;
+
+void main()
+{
+    vec3 texel = texture(Source, vTexCoord.xy).rgb;
+    vec3 pixelHigh = ((1.0 + params.BRIGHTBOOST) - (0.2 * texel)) * texel;
+    vec3 pixelLow  = ((1.0 - params.INTENSITY) + (0.1 * texel)) * texel;
+    float selectY = mod(vTexCoord.y * params.SCANTHICK * params.SourceSize.y, 2.0);
+    float selectHigh = step(1.0, selectY);
+    float selectLow = 1.0 - selectHigh;
+    vec3 pixelColor = (selectLow * pixelLow) + (selectHigh * pixelHigh);
+
+    FragColor = vec4(pixelColor, 1.0);
+}