press f to effect text

2 files changed, 54 insertions, 2 deletions

diff --git a/opplysning.c b/opplysning.c
index 7155a2c..57e90b1 100644
--- a/opplysning.c
+++ b/opplysning.c
@@ -109,11 +109,32 @@ const char *the_alphabet = "0123456789"
 			   "ÄÅÉËÞÜÚÍÓÖÁSSÐFGHÏŒØÆŒ©®BÑΜ"
 			   "äåéëþüúíóöáßðfghïœø朩®bñµ"
 			   "!@#$%^&*()[];'\\:\"|,./<>?";
+Shader the_shader;
+RenderTexture2D the_target;
+int the_shader_u_time;
 
 void
+blur(int x, int y, Font f, Color c, char *s)
+{
+	const int sh = 1080;
+	Vector2 m = MeasureTextEx(f, s, f.baseSize, 0);
+
+	BeginTextureMode(the_target);
+	ClearBackground((Color){0});
+	DrawTextEx(f, s, (Vector2){0, 0}, (float)f.baseSize, 0, c);
+	EndTextureMode();
+
+	BeginShaderMode(the_shader);
+	float t = GetTime();
+	SetShaderValue(the_shader, the_shader_u_time, &t, SHADER_UNIFORM_FLOAT);
+	DrawTextureRec(the_target.texture, (Rectangle){0, sh - m.y, m.x, -m.y},
+		       (Vector2){x, y}, WHITE);
+	EndShaderMode();
+}
+void
 line(int x, int y, Font f, Color c, char *s)
 {
-	DrawTextEx(f, s, (Vector2){x, y}, (float)f.baseSize, 2, c);
+	DrawTextEx(f, s, (Vector2){x, y}, (float)f.baseSize, 0, c);
 }
 
 int
@@ -140,6 +161,11 @@ main(void)
 	Color fg = BLACK;
 	Color hd = {0xf0, 0x4a, 0x00, 0xff};
 
+	the_shader = LoadShader(0, "s.glsl");
+	the_shader_u_time = GetShaderLocation(the_shader, "u_time");
+	the_target = LoadRenderTexture(sw, sh);
+	int fx = 0;
+
 	while (!WindowShouldClose()) {
 		struct timespec now = {0};
 		clock_gettime(CLOCK_REALTIME, &now);
@@ -147,6 +173,9 @@ main(void)
 		char ts[64] = {0};
 		snprintf(ts, sizeof(ts), "%02d:%02d", ti->tm_hour, ti->tm_min);
 
+		if (IsKeyPressed(KEY_F))
+			fx = !fx;
+
 		BeginDrawing();
 		ClearBackground(bg);
 		Vector2 v2_ts = MeasureTextEx(font_h, ts, font_h.baseSize, 0);
@@ -166,7 +195,10 @@ main(void)
 				snprintf(s, sizeof(s), "%s %u. %s",
 					 ukedag[e->wday], e->day,
 					 maaned[e->month]);
-				line(25, y += 50, font_h, hd, s);
+				if (fx)
+					blur(25, y += 50, font_h, hd, s);
+				else
+					line(25, y += 50, font_h, hd, s);
 				y += 20;
 			}
 			{
diff --git a/s.glsl b/s.glsl
new file mode 100644
index 0000000..3af1492
--- /dev/null
+++ b/s.glsl
@@ -0,0 +1,20 @@
+#version 100
+
+precision mediump float;
+
+varying vec2 fragTexCoord;
+varying vec4 fragColor;
+
+uniform sampler2D texture0;
+uniform vec4 colDiffuse;
+uniform float u_time;
+
+void main()
+{
+    vec4 tex = texture2D(texture0, fragTexCoord);
+    vec3 a = vec3(1.0, 0.0, 1.0);
+    vec3 b = vec3(0.0, 1.0, 0.0);
+    float m = 0.5 + 0.5*(sin(0.2*gl_FragCoord.x + 5.0*u_time) + cos(0.2*gl_FragCoord.y + 5.0*u_time));
+    //float m = 0.5;
+    gl_FragColor = vec4(mix(a, b, m), tex.a);
+}