init commit

Assets/Lesson_1 Assets/Shaders/GrassShader.compute

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+#pragma kernel CSMain
+
+RWStructuredBuffer<float4x4> matrices;
+
+int _CountX;
+int _CountZ;
+float _SizeX;
+float _SizeZ;
+float _Height;
+
+[numthreads(64, 1, 1)]
+void CSMain(uint3 id : SV_DispatchThreadID)
+{
+    uint idx = id.x;
+    uint total = _CountX * _CountZ;
+    if (idx >= total)
+        return;
+
+    uint ix = idx % _CountX;
+    uint iz = idx / _CountX;
+
+    float fx = ((float) ix / (_CountX - 1)) * _SizeX - (_SizeX * 0.5);
+    float fz = ((float) iz / (_CountZ - 1)) * _SizeZ - (_SizeZ * 0.5);
+    float fy = _Height;
+
+    float4x4 m = float4x4(
+        1, 0, 0, 0,
+        0, 1, 0, 0,
+        0, 0, 1, 0,
+        fx, fy, fz, 1
+    );
+
+    matrices[idx] = m;
+}