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public int shadowResolution; |
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} |
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public class LightweightPipeline : RenderPipeline, IComparer<VisibleLight> |
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public class LightweightPipeline : RenderPipeline |
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// Max amount of visible lights. This controls the lights constant buffers in shader but not the max shaded lights.
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// Lights are set per-object and the max shaded lights for each object are controlled by the max pixel lights in pipeline asset and kMaxVertexLights.
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private static readonly int kMaxVisibleLights = 16; |
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private static readonly int kMaxVertexLights = 4; |
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private Vector4[] m_LightPositions = new Vector4[kMaxVisibleLights]; |
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private Vector4[] m_LightColors = new Vector4[kMaxVisibleLights]; |
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private Vector4[] m_LightAttenuations = new Vector4[kMaxVisibleLights]; |
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private Vector4[] m_LightSpotDirections = new Vector4[kMaxVisibleLights]; |
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// Amount of light indices buffer set per object.
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// TODO: Change cullresults to return amount of renderers so we can allocate/reallocate enough buffer data
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// As off now allocating a enough buffer to hold a scene that should enough for a small demo/game
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private static readonly int kMaxLightIndices = 1024 * kMaxVisibleLights; |
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private ComputeBuffer m_LightIndexListBuffer; |
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private static readonly int kMaxLights = 8; |
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private static readonly int kMaxVertexLights = 4; |
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private int m_ShadowLightIndex = -1; |
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private readonly int[] m_LightTypePriority = new int[4] {2, 1, 2, 0}; // Spot and Point lights have max priority
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private int m_ShadowLightIndex = -1; |
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private static readonly ShaderPassName m_ForwardBasePassName = new ShaderPassName("LightweightForward"); |
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private Vector4[] m_LightPositions = new Vector4[kMaxLights]; |
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private Vector4[] m_LightColors = new Vector4[kMaxLights]; |
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private Vector4[] m_LightAttenuations = new Vector4[kMaxLights]; |
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private Vector4[] m_LightSpotDirections = new Vector4[kMaxLights]; |
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private static readonly ShaderPassName m_ForwardBasePassName = new ShaderPassName("LightweightForward") ; |
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public LightweightPipeline(LightweightPipelineAsset asset) |
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{ |
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m_Asset = asset; |
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m_ShadowMapRTID = new RenderTargetIdentifier(m_ShadowMapProperty); |
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Shader.globalRenderPipeline = "LightweightPipeline"; |
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// TODO: Change cullresults to return amount of renderers so we can allocate/reallocate enough buffer data
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m_LightIndexListBuffer = new ComputeBuffer(kMaxLightIndices, sizeof(uint)); |
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m_LightIndexListBuffer.Dispose(); |
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base.Render(context, cameras); |
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base.Render(context, cameras); |
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foreach (Camera camera in cameras) |
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{ |
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int pixelLightsCount, vertexLightsCount; |
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GetMaxSupportedLights(visibleLights.Length, out pixelLightsCount, out vertexLightsCount); |
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SortLights(ref visibleLights, pixelLightsCount); |
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InitializeMainShadowLightIndex(visibleLights); |
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if (m_ShadowLightIndex > -1) |
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shadowsRendered = RenderShadows(cull, visibleLights[m_ShadowLightIndex], context); |
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cmd.Dispose(); |
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// Setup light and shadow shader constants
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cull.FillLightIndices(m_LightIndexListBuffer); |
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SetupLightShaderVariables(visibleLights, pixelLightsCount, vertexLightsCount, context); |
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if (shadowsRendered) |
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SetupShadowShaderVariables(context, m_ShadowCasterCascadesCount); |
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if (m_Asset.EnableAmbientProbe) |
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settings.rendererConfiguration |= RendererConfiguration.PerObjectLightProbe; |
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settings.rendererConfiguration |= RendererConfiguration.ProvideLightIndices; |
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context.DrawRenderers(ref settings); |
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private void InitializeLightData() |
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{ |
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for (int i = 0; i < kMaxLights; ++i) |
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for (int i = 0; i < kMaxVisibleLights; ++i) |
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{ |
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m_LightPositions[i] = Vector4.zero; |
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m_LightColors[i] = Vector4.zero; |
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private void SetupLightShaderVariables(VisibleLight[] lights, int pixelLightCount, int vertexLightCount, ScriptableRenderContext context) |
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{ |
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int totalLightCount = pixelLightCount + vertexLightCount; |
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for (int i = 0; i < totalLightCount; ++i) |
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int maxLights = Math.Min(kMaxVisibleLights, lights.Length); |
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for (int i = 0; i < maxLights; ++i) |
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{ |
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VisibleLight currLight = lights[i]; |
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if (currLight.lightType == LightType.Directional) |
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} |
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else |
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{ |
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m_LightSpotDirections[i] = new Vector4(0.0f, 0.0f, 1.0f, 0.0f); |
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m_LightSpotDirections[i] = new Vector4(0.0f, 0.0f, 1.0f, 0.0f) ; |
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m_LightAttenuations[i] = new Vector4(-1.0f, 1.0f, quadAtten, rangeSq); |
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} |
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} |
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cmd.SetGlobalVectorArray("globalLightColor", m_LightColors); |
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cmd.SetGlobalVectorArray("globalLightAtten", m_LightAttenuations); |
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cmd.SetGlobalVectorArray("globalLightSpotDir", m_LightSpotDirections); |
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float shadowMinNormalBias = m_Asset.ShadowMinNormalBias; |
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float shadowNormalBias = m_Asset.ShadowNormalBias; |
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cmd.SetGlobalVector("globalLightData", new Vector4(pixelLightCount, totalLightCount, shadowMinNormalBias, shadowNormalBias)); |
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cmd.SetGlobalBuffer("globalLightIndexList", m_LightIndexListBuffer); |
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cmd.SetGlobalVector("globalLightData", new Vector4(pixelLightCount, m_ShadowLightIndex, m_Asset.ShadowMinNormalBias, m_Asset.ShadowNormalBias)); |
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SetShaderKeywords(cmd, vertexLightCount > 0); |
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context.ExecuteCommandBuffer(cmd); |
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cmd.Dispose(); |
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return resolution; |
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} |
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void SetupShadowShaderVariables(ScriptableRenderContext context, int cascadeCount) |
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private void SetupShadowShaderVariables(ScriptableRenderContext context, int cascadeCount) |
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{ |
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float shadowResolution = m_ShadowSlices[0].shadowResolution; |
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setupShadow.Dispose(); |
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} |
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void SetShaderKeywords(CommandBuffer cmd, bool vertexLightSupport) |
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private void SetShaderKeywords(CommandBuffer cmd, bool vertexLightSupport) |
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{ |
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if (vertexLightSupport) |
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cmd.EnableShaderKeyword("_VERTEX_LIGHTS"); |
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cmd.DisableShaderKeyword("_LIGHT_PROBES_ON"); |
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} |
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// Finds main light and main shadow casters and places them in the beginning of array.
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// Sort the remaining array based on custom IComparer criteria.
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private void SortLights(ref VisibleLight[] lights, int pixelLightsCount) |
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private void InitializeMainShadowLightIndex(VisibleLight[] lights) |
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if (lights.Length == 0) |
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return; |
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bool shadowsSupported = m_Asset.CurrShadowType != ShadowType.NO_SHADOW && pixelLightsCount > 0; |
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int mainLightIndex = -1; |
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float maxIntensity = -1; |
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VisibleLight currLight = lights[i]; |
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if (currLight.lightType == LightType.Directional) |
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if (mainLightIndex == -1 || currLight.light.intensity > lights[mainLightIndex].light.intensity) |
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mainLightIndex = i; |
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if (shadowsSupported && (currLight.light.shadows != LightShadows.None) && IsSupportedShadowType(currLight.lightType)) |
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// Prefer directional shadows, if not sort by intensity
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if (m_ShadowLightIndex == -1 || currLight.lightType > lights[m_ShadowLightIndex].lightType) |
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m_ShadowLightIndex = i; |
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} |
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// If supports a single directional light only, main light is main shadow light.
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if (pixelLightsCount == 1 && m_ShadowLightIndex > -1) |
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mainLightIndex = m_ShadowLightIndex; |
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int startIndex = 0; |
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if (mainLightIndex > -1) |
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{ |
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SwapLights(ref lights, 0, mainLightIndex); |
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startIndex++; |
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} |
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if (mainLightIndex != m_ShadowLightIndex && m_ShadowLightIndex > 0) |
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{ |
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SwapLights(ref lights, 1, m_ShadowLightIndex); |
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m_ShadowLightIndex = 1; |
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startIndex++; |
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Light light = lights[i].light; |
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if (light.shadows != LightShadows.None && IsSupportedShadowType(light.type) && light.intensity > maxIntensity) |
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{ |
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m_ShadowLightIndex = i; |
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maxIntensity = light.intensity; |
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} |
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Array.Sort(lights, startIndex, lights.Length - startIndex, this); |
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} |
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private bool IsSupportedShadowType(LightType type) |
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private void SwapLights(ref VisibleLight[] lights, int lhsIndex, int rhsIndex) |
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{ |
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if (lhsIndex == rhsIndex) |
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return; |
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VisibleLight temp = lights[lhsIndex]; |
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lights[lhsIndex] = lights[rhsIndex]; |
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lights[rhsIndex] = temp; |
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} |
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// Prioritizes Spot and Point lights by intensity. If any directional light, it will be the main
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// light and will not be considered in the computation.
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// TODO: Move to a better sorting solution, e.g, prioritize lights per object.
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public int Compare(VisibleLight lhs, VisibleLight rhs) |
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{ |
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int lhsLightTypePriority = m_LightTypePriority[(int)lhs.lightType]; |
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int rhsLightTypePriority = m_LightTypePriority[(int)rhs.lightType]; |
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if (lhsLightTypePriority != rhsLightTypePriority) |
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return rhsLightTypePriority - lhsLightTypePriority; |
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return (int)(rhs.light.intensity - lhs.light.intensity); |
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} |
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} |
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} |
sebastienlagarde
7 年前
