From 4a2f2514ec3b6c96fe22233cfee7673327cef690 Mon Sep 17 00:00:00 2001
From: "BADIM-PC\\Vadim" <grigoruk@gmail.com>
Date: Tue, 20 Feb 2018 15:23:22 +0300
Subject: [PATCH] no message

---
 data/shaders/crt-geom.frag   | 23 +++++++++++++++++++++++
 data/shaders/crt-simple.frag |  1 -
 src/system.c                 |  2 +-
 3 files changed, 24 insertions(+), 2 deletions(-)
 create mode 100644 data/shaders/crt-geom.frag

diff --git a/data/shaders/crt-geom.frag b/data/shaders/crt-geom.frag
new file mode 100644
index 0000000..f7d55b8
--- /dev/null
+++ b/data/shaders/crt-geom.frag
@@ -0,0 +1,23 @@
+#define distortion 0.08
+
+in vec2 texCoord;
+out vec4 fragColor;
+
+uniform sampler2D tex;
+
+vec2 radialDistortion(vec2 coord) {
+  vec2 cc = coord - vec2(0.5);
+  float dist = dot(cc, cc) * distortion;
+  return coord + cc * (1.0 - dist) * dist;
+}
+
+void main(void) {
+	vec4 rgba = texture2D(tex, radialDistortion(texCoord));
+
+	vec4 intensity = fract(gl_FragCoord.y * (0.5 * 4.0 / 3.0)) > 0.5 
+		? vec4(0) 
+		: smoothstep(0.2, 0.8, rgba) + normalize(rgba);
+	
+	fragColor = intensity * -0.25 + rgba * 1.1;
+
+}
\ No newline at end of file
diff --git a/data/shaders/crt-simple.frag b/data/shaders/crt-simple.frag
index f90a9e1..00fd3bc 100644
--- a/data/shaders/crt-simple.frag
+++ b/data/shaders/crt-simple.frag
@@ -1,4 +1,3 @@
-in vec4 color;
 in vec2 texCoord;
 out vec4 fragColor;
 
diff --git a/src/system.c b/src/system.c
index 80f4f15..dc2fbce 100644
--- a/src/system.c
+++ b/src/system.c
@@ -1114,7 +1114,7 @@ static s32 start(s32 argc, char **argv, const char* folder)
 	GPU_Image* texture = GPU_CreateImage(TIC80_FULLWIDTH, TIC80_FULLHEIGHT, GPU_FORMAT_BGRA);
 
 	u32 crt_shader = 0;
-	GPU_ShaderBlock crt_block = load_shader_program(&crt_shader, "data/shaders/common.vert", "data/shaders/crt-simple.frag");
+	GPU_ShaderBlock crt_block = load_shader_program(&crt_shader, "data/shaders/common.vert", "data/shaders/crt-geom.frag");
 	GPU_ActivateShaderProgram(crt_shader, &crt_block);
 
 	{