From eeedd2061bee36f49ea20e898e8edf3676bd15b5 Mon Sep 17 00:00:00 2001
From: Stanislaw Halik <sthalik@misaki.pl>
Date: Wed, 23 Feb 2022 13:25:39 +0100
Subject: flush

---
 shaders/tile-shader.frag | 5 ++++-
 shaders/tile-shader.vert | 7 +++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

(limited to 'shaders')

diff --git a/shaders/tile-shader.frag b/shaders/tile-shader.frag
index 624fc8c5..2d3de0b2 100644
--- a/shaders/tile-shader.frag
+++ b/shaders/tile-shader.frag
@@ -1,11 +1,14 @@
 uniform vec3 color = vec3(1.0, 1.0, 1.0);
-uniform sampler2D textureData;
+layout(location = 2) uniform sampler2D textureData;
+layout(location = 1) uniform float y_scale;
 
 in vec2 interpolatedTextureCoordinates;
+in float interpolated_frag_depth;
 
 out vec4 fragmentColor;
 
 void main() {
     fragmentColor.rgb = color*texture(textureData, interpolatedTextureCoordinates).rgb;
     fragmentColor.a = 1.0;
+    gl_FragDepth = -interpolated_frag_depth * y_scale;
 }
diff --git a/shaders/tile-shader.vert b/shaders/tile-shader.vert
index 7a5bd1c3..cc90bae5 100644
--- a/shaders/tile-shader.vert
+++ b/shaders/tile-shader.vert
@@ -2,12 +2,15 @@ precision highp float;
 
 layout(location = 0) in vec4 position;
 layout(location = 1) in vec2 textureCoordinates;
-uniform mat4 projection;
+layout(location = 0) uniform mat4 projection;
+layout(location = 1) uniform float y_scale;
 
 out vec2 interpolatedTextureCoordinates;
+out float interpolated_frag_depth;
 
 void main() {
     interpolatedTextureCoordinates = textureCoordinates;
 
-    gl_Position = projection * position;
+    gl_Position = projection * vec4(position.xy, 0, position.w) + vec4(0, position.z * y_scale, 0, 0);
+    interpolated_frag_depth = position.z;
 }
-- 
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