From 31457b8cb65c6a08ec1d5869274ebf19d614e946 Mon Sep 17 00:00:00 2001
From: Sean Pringle <sean.pringle@gmail.com>
Date: Tue, 21 Jul 2020 09:39:38 +1000
Subject: [PATCH] example instanced shader

---
 .../glsl330/base_lighting_instanced.vs        | 36 +++++++++++++++++++
 1 file changed, 36 insertions(+)
 create mode 100644 examples/shaders/resources/shaders/glsl330/base_lighting_instanced.vs

diff --git a/examples/shaders/resources/shaders/glsl330/base_lighting_instanced.vs b/examples/shaders/resources/shaders/glsl330/base_lighting_instanced.vs
new file mode 100644
index 000000000..5e5430b3f
--- /dev/null
+++ b/examples/shaders/resources/shaders/glsl330/base_lighting_instanced.vs
@@ -0,0 +1,36 @@
+#version 330
+
+// Input vertex attributes
+in vec3 vertexPosition;
+in vec2 vertexTexCoord;
+in vec3 vertexNormal;
+in vec4 vertexColor;
+
+layout (location = 12) in mat4 instance;
+
+// Input uniform values
+uniform mat4 mvp;
+
+// Output vertex attributes (to fragment shader)
+out vec3 fragPosition;
+out vec2 fragTexCoord;
+out vec4 fragColor;
+out vec3 fragNormal;
+
+// NOTE: Add here your custom variables
+
+void main()
+{
+    // Send vertex attributes to fragment shader
+    fragPosition = vec3(instance * vec4(vertexPosition, 1.0));
+    fragTexCoord = vertexTexCoord;
+    fragColor = vertexColor;
+
+    mat3 normalMatrix = transpose(inverse(mat3(instance)));
+    fragNormal = normalize(normalMatrix * vertexNormal);
+
+    mat4 mvpi = mvp * instance;
+
+    // Calculate final vertex position
+    gl_Position = mvpi * vec4(vertexPosition, 1.0);
+}