From c8131ea95846f76fb196a78ce9c9b09aeb15736c Mon Sep 17 00:00:00 2001
From: jussi
Date: Sat, 25 Jan 2025 17:36:29 +0200
Subject: Atlas texture repeat example.

---
 examples/resources/shaders/glsl330/atlas_repeat.fs | 28 ++++++++++++++++++++++
 examples/resources/shaders/glsl330/base.vs         |  6 ++++-
 2 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 examples/resources/shaders/glsl330/atlas_repeat.fs

(limited to 'examples/resources/shaders')

diff --git a/examples/resources/shaders/glsl330/atlas_repeat.fs b/examples/resources/shaders/glsl330/atlas_repeat.fs
new file mode 100644
index 0000000..90547f0
--- /dev/null
+++ b/examples/resources/shaders/glsl330/atlas_repeat.fs
@@ -0,0 +1,28 @@
+#version 330
+
+// Input vertex attributes (from vertex shader)
+in vec3 fragPosition;
+in vec2 fragTexCoord;
+in vec4 fragColor;
+
+// Input uniform values
+uniform sampler2D texture0;
+
+uniform vec2 atlasSize;
+uniform vec2 tileTexSize;
+
+// Output fragment color
+out vec4 finalColor;
+
+vec2 texTileSize = tileTexSize / atlasSize;
+vec2 atlasTileSize = atlasSize / tileTexSize;
+
+void main() {
+	vec2 tileTexCoord = fract( vec2( fragPosition.x, fragPosition.y ) / tileTexSize );
+	// Get tile texture corner.
+	vec2 texOffset = floor( fragTexCoord / texTileSize ) * texTileSize;
+	vec2 fragCoord = tileTexCoord / atlasTileSize + texOffset;
+	vec4 texelColor = texture( texture0, fragCoord );
+
+	finalColor = texelColor * fragColor;
+}
diff --git a/examples/resources/shaders/glsl330/base.vs b/examples/resources/shaders/glsl330/base.vs
index c6e94f6..b29bed8 100644
--- a/examples/resources/shaders/glsl330/base.vs
+++ b/examples/resources/shaders/glsl330/base.vs
@@ -10,16 +10,20 @@ in vec4 vertexColor;
 uniform mat4 mvp;
 
 // Output vertex attributes (to fragment shader)
+out vec3 fragPosition;
 out vec2 fragTexCoord;
+out vec3 fragNormal;
 out vec4 fragColor;
 
 // NOTE: Add here your custom variables
 
 void main() {
 	// Send vertex attributes to fragment shader
+	fragPosition = vertexPosition;
 	fragTexCoord = vertexTexCoord;
+	fragNormal = vertexNormal;
 	fragColor = vertexColor;
 
 	// Calculate final vertex position
 	gl_Position = mvp * vec4( vertexPosition, 1.0 );
-}
\ No newline at end of file
+}
-- 
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