private static void DrawShadow(ref RainRender rend)
{
ShadowQuality currentQuality = QualitySettings.shadows;
QualitySettings.shadows = ShadowQuality.Disable;
rend.shadowCamera.Render();
QualitySettings.shadows = currentQuality;
}
private static void Dispose(ref RainData data, ref RainRender rend)
{
Destroy(rend.shadowCamera);
Destroy(rend.rainMaterial);
Destroy(data.shaderData.shadowTexture);
data.shaderData.instancingBuffer.Dispose();
data.shaderData.velocityBuffer.Dispose();
}
private static void Initialize(ref RainData data, ref RainRender rend, Camera cam, Transform box)
{
data.shaderData.shadowTexture = new RenderTexture(data.settingData.occlusionResolution, data.settingData.occlusionResolution, 16, RenderTextureFormat.RFloat, RenderTextureReadWrite.Linear);
data.shaderData.shadowTexture.enableRandomWrite = true;
data.shaderData.instancingBuffer = new ComputeBuffer(data.settingData.maxSize, RainPanel.SIZE);
data.shaderData.position = box.position;
data.shaderData.volume = box.localScale;
data.shaderData.forward = box.forward;
data.shaderData.up = box.up;
data.shaderData.right = box.right;
data.shaderData.velocityBuffer = new ComputeBuffer(data.settingData.maxSize, 4);
rend.shadowCamera = cam;
rend.rainMaterial = new Material(Shader.Find("Unlit/RainningProcedural"));
cam.enabled = false;
cam.orthographic = true;
cam.aspect = data.shaderData.volume.x / data.shaderData.volume.z;
cam.targetTexture = data.shaderData.shadowTexture;
cam.transform.position = data.shaderData.position + data.shaderData.volume.y / 2 * box.transform.up;
cam.transform.forward = -box.transform.up;
cam.transform.right = box.transform.right;
cam.transform.up = box.transform.forward;
cam.farClipPlane = data.shaderData.volume.y;
cam.nearClipPlane = 0;
cam.SetReplacementShader(Shader.Find("Hidden/OrthographiceDepth"), "");
cam.orthographicSize = data.shaderData.volume.z / 2;
cam.renderingPath = RenderingPath.Forward;
cam.clearFlags = CameraClearFlags.Color;
cam.backgroundColor = Color.white;
cam.useOcclusionCulling = false;
cam.allowHDR = true;
cam.allowMSAA = false;
RainPanel[] panels = new RainPanel[data.settingData.maxSize];
for (int i = 0; i < panels.Length; ++i)
{
panels[i].binormal = Vector3.right;
panels[i].normal = Vector3.forward;
Vector3 min = data.shaderData.position - data.shaderData.volume * 0.5f;
Vector3 max = data.shaderData.position + data.shaderData.volume * 0.5f;
panels[i].position = new Vector3(Random.Range(min.x, max.x), Random.Range(min.y, max.y), Random.Range(min.z, max.z));
}
data.shaderData.instancingBuffer.SetData(panels);
float[] fallDownSpeeds = new float[data.settingData.maxSize];
for (int i = 0; i < fallDownSpeeds.Length; ++i)
{
fallDownSpeeds[i] = Random.Range(data.settingData.fallDownVeolocity.x, data.settingData.fallDownVeolocity.y);
}
data.shaderData.velocityBuffer.SetData(fallDownSpeeds);
}
private static void SetShaderBuffer(ref RainData data, ref RainRender rend, CommandBuffer buffer)
{
ComputeShader sd = data.settingData.randomDrawShader;
buffer.SetGlobalVector(ShaderIDs._CameraState, new Vector4(-data.shaderData.up.x, -data.shaderData.up.y, -data.shaderData.up.z, rend.shadowCamera.farClipPlane));
sd.SetVector(ShaderIDs._CameraState, new Vector4(-data.shaderData.up.x, -data.shaderData.up.y, -data.shaderData.up.z, rend.shadowCamera.farClipPlane));
buffer.SetGlobalVector(ShaderIDs._CameraPos, rend.shadowCamera.transform.position);
buffer.SetGlobalBuffer(ShaderIDs.instancingBuffer, data.shaderData.instancingBuffer);
buffer.SetGlobalTexture(ShaderIDs._EnvReflect, data.settingData.reflectionMap);
sd.SetVector(ShaderIDs._CameraPos, rend.shadowCamera.transform.position);
sd.SetBuffer(0, ShaderIDs.instancingBuffer, data.shaderData.instancingBuffer);
directions[0] = data.shaderData.right;
directions[1] = data.shaderData.forward;
directions[2] = data.shaderData.volume;
sd.SetVectorArray(ShaderIDs._Direction, directions);
sd.SetFloat(ShaderIDs._RandomNumber, Random.Range(0f, 10f));
sd.SetVector(ShaderIDs._ShadowTextureResolution, new Vector2(data.shaderData.shadowTexture.width, data.shaderData.shadowTexture.height));
sd.SetTexture(0, ShaderIDs._ShadowTexture, data.shaderData.shadowTexture);
sd.SetMatrix(ShaderIDs._WorldToShadowMatrix, GL.GetGPUProjectionMatrix(rend.shadowCamera.projectionMatrix, false) * rend.shadowCamera.worldToCameraMatrix);
sd.SetFloat(ShaderIDs._FallDownSpeed, Time.deltaTime);
sd.SetBuffer(0, ShaderIDs.velocityBuffer, data.shaderData.velocityBuffer);
sd.SetVector(ShaderIDs._LookPos, Camera.current.transform.position);
sd.SetVector(ShaderIDs._FallDownRange, data.settingData.fallDownVeolocity);
}
private static void Draw(ref RainData data, ref RainRender rend, CommandBuffer buffer)
{
buffer.DrawProcedural(Matrix4x4.identity, rend.rainMaterial, 0, MeshTopology.Quads, 4, data.shaderData.instancingBuffer.count);
}
