From 84bcd409a3743e933d039a9b3e073030fd2630df Mon Sep 17 00:00:00 2001
From: Adrian Kummerlaender
Date: Wed, 23 May 2018 19:06:47 +0200
Subject: Implement particle trails using overlaying textures

---
 src/shader/display_fragment.glsl | 25 ++++++++++++++++++++++---
 src/shader/vertex.glsl           |  3 ++-
 2 files changed, 24 insertions(+), 4 deletions(-)

(limited to 'src/shader')

diff --git a/src/shader/display_fragment.glsl b/src/shader/display_fragment.glsl
index 8b98ce1..03986a0 100644
--- a/src/shader/display_fragment.glsl
+++ b/src/shader/display_fragment.glsl
@@ -1,11 +1,30 @@
 static const std::string DISPLAY_FRAGMENT_SHADER_CODE = R"(
-#version 330 core
+#version 460
 
 out vec4 FragColor;
 in vec2 TexCoords;
-uniform sampler2D screen_texture;
+
+uniform sampler2D screen_texture_0;
+uniform sampler2D screen_texture_1;
+uniform sampler2D screen_texture_2;
+uniform sampler2D screen_texture_3;
+uniform sampler2D screen_texture_4;
+uniform sampler2D screen_texture_5;
+uniform sampler2D screen_texture_6;
+uniform sampler2D screen_texture_7;
+uniform sampler2D screen_texture_8;
+uniform sampler2D screen_texture_9;
 
 void main() {
-	FragColor = texture(screen_texture, TexCoords);
+	FragColor =       texture(screen_texture_0, TexCoords)
+	          + 0.9 * texture(screen_texture_1, TexCoords)
+	          + 0.8 * texture(screen_texture_2, TexCoords)
+	          + 0.7 * texture(screen_texture_3, TexCoords)
+	          + 0.6 * texture(screen_texture_4, TexCoords)
+	          + 0.5 * texture(screen_texture_5, TexCoords)
+	          + 0.4 * texture(screen_texture_6, TexCoords)
+	          + 0.3 * texture(screen_texture_7, TexCoords)
+	          + 0.2 * texture(screen_texture_8, TexCoords)
+	          + 0.1 * texture(screen_texture_9, TexCoords);
 }
 )";
diff --git a/src/shader/vertex.glsl b/src/shader/vertex.glsl
index 8ab6ccb..2d4009a 100644
--- a/src/shader/vertex.glsl
+++ b/src/shader/vertex.glsl
@@ -3,6 +3,7 @@ uniform mat4 MVP;
 
 void main() {
 	gl_Position = MVP * vec4(gl_Vertex.xy, 0.0, 1.0);
-	gl_FrontColor = vec4(max(1. - gl_Vertex.z/5., 0.1), 0., 0., 0.);
+	//gl_FrontColor = vec4(max(1. - gl_Vertex.z/5., 0.1), 0., 0., 0.);
+	gl_FrontColor = vec4(1., 0., 0., 0.);
 }
 )";
-- 
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