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#include "UnityPrefix.h"
#include "ImposterRenderTexture.h"
#if ENABLE_TERRAIN
#include "Runtime/Graphics/RenderTexture.h"
#include "Runtime/Camera/Camera.h"
#include "Runtime/Shaders/GraphicsCaps.h"
#include "Runtime/Utilities/BitUtility.h"
#include "Runtime/Misc/GameObjectUtility.h"
#include "Runtime/Graphics/Transform.h"
#include "Runtime/Camera/RenderManager.h"
#include "Runtime/Graphics/DrawUtil.h"
#include "External/shaderlab/Library/FastPropertyName.h"
#include "Runtime/Shaders/Material.h"
#include "Runtime/Camera/Renderqueue.h"
#if UNITY_PS3
# include "Runtime/GfxDevice/ps3/GfxDevicePS3.h"
#endif
const float kMinimumAngleDelta = 0.1f * kDeg2Rad;
const float kImpostorPadding = 1.0f;
ImposterRenderTexture::ImposterRenderTexture (const TreeDatabase& treeDB)
: m_TreeDatabase(treeDB)
, m_AngleX(std::numeric_limits<float>::infinity())
, m_AngleY(std::numeric_limits<float>::infinity())
, m_ImposterHeight(256)
, m_MaxImposterSize(2048)
, m_CameraOrientationMatrix(Matrix4x4f::identity)
{
// if render textures or vertex shaders are not supported, there shall be
// no impostors.
RenderTexture::SetTemporarilyAllowIndieRenderTexture (true);
if (!RenderTexture::IsEnabled())
{
RenderTexture::SetTemporarilyAllowIndieRenderTexture (false);
m_Supported = false;
m_Texture = NULL;
m_Camera = NULL;
return;
}
m_Supported = true;
const std::vector<TreeDatabase::Prototype>& prototypes = m_TreeDatabase.GetPrototypes();
m_Areas.resize(prototypes.size());
// Calculate how many pixel width we need!
float totalPixelWidth = 0.0F;
for (int i = 0; i < prototypes.size(); ++i)
{
totalPixelWidth += m_ImposterHeight * prototypes[i].getBillboardAspect() + kImpostorPadding;
}
int textureWidth = std::min<int>(m_MaxImposterSize, ClosestPowerOfTwo(RoundfToIntPos(totalPixelWidth)));
float uOffset = kImpostorPadding / (float)textureWidth;
// Calculate areas
float runOffset = 0.0F;
for (int i = 0; i < prototypes.size(); ++i)
{
float width = (m_ImposterHeight * prototypes[i].getBillboardAspect()) / totalPixelWidth;
m_Areas[i].Set(runOffset + uOffset, 0.0F, width - uOffset - uOffset, 1.0F);
runOffset += width;
}
// Setup Render texture
m_Texture = NEW_OBJECT (RenderTexture);
m_Texture->Reset();
m_Texture->SetHideFlags(Object::kDontSave);
m_Texture->SetWidth(textureWidth);
m_Texture->SetHeight(m_ImposterHeight);
m_Texture->SetColorFormat(kRTFormatARGB32);
m_Texture->SetDepthFormat(kDepthFormat16);
m_Texture->SetName("Tree Imposter Texture");
m_Texture->SetMipMap(true);
m_Texture->SetMipMapBias(-1);
m_Texture->AwakeFromLoad(kInstantiateOrCreateFromCodeAwakeFromLoad);
// Setup camera
GameObject* cameraGO = &CreateGameObjectWithHideFlags ("Imposter Camera", true, Object::kHideAndDontSave, "Camera", NULL);
m_Camera = &cameraGO->GetComponent(Camera);
m_Camera->SetTargetTexture(m_Texture);
m_Camera->SetClearFlags(Camera::kSolidColor);
m_Camera->SetBackgroundColor(ColorRGBAf(.2f,.2f,.2f,0));
m_Camera->SetOrthographic(true);
m_Camera->SetCullingMask(0);
m_Camera->SetEnabled(false);
#if UNITY_PS3
((GfxDevicePS3&)GetGfxDevice()).RegisterSurfaceLostCallback(&InvalidateRenderTexture, this);
#endif
RenderTexture::SetTemporarilyAllowIndieRenderTexture (false);
}
ImposterRenderTexture::~ImposterRenderTexture()
{
#if UNITY_PS3
((GfxDevicePS3&)GetGfxDevice()).UnregisterSurfaceLostCallback(&InvalidateRenderTexture, this);
#endif
if (m_Camera != NULL)
DestroyObjectHighLevel(&m_Camera->GetGameObject());
if (m_Texture != NULL)
DestroyObjectHighLevel(m_Texture);
}
void ImposterRenderTexture::UpdateImposters (const Camera& mainCamera)
{
// Only update if we really have to because the viewing angle is very different
const Transform& transform = mainCamera.GetComponent (Transform);
const Vector3f& cameraEuler = QuaternionToEuler(transform.GetRotation());
if (m_Texture->IsCreated())
{
if (m_AngleX != std::numeric_limits<float>::infinity() && std::abs(DeltaAngleRad (m_AngleX, cameraEuler.x)) < kMinimumAngleDelta &&
m_AngleY != std::numeric_limits<float>::infinity() && std::abs(DeltaAngleRad (m_AngleY, cameraEuler.y)) < kMinimumAngleDelta)
return;
}
m_AngleX = cameraEuler.x;
m_AngleY = cameraEuler.y;
m_Camera->GetComponent (Transform).SetLocalEulerAngles(Vector3f (cameraEuler.x, cameraEuler.y, 0) * Rad2Deg(1));
m_CameraOrientationMatrix = m_Camera->GetCameraToWorldMatrix();
Camera& oldCamera = GetCurrentCamera();
// Clear the whole render texture
m_Camera->SetNormalizedViewportRect(Rectf (0, 0, 1, 1));
m_Camera->SetClearFlags(Camera::kSolidColor);
m_Camera->StandaloneRender(Camera::kRenderFlagDontRestoreRenderState | Camera::kRenderFlagSetRenderTarget, NULL, "");
const std::vector<TreeDatabase::Prototype>& prototypes = m_TreeDatabase.GetPrototypes();
for (int i = 0; i < prototypes.size(); ++i)
{
const Rectf& rect = m_Areas[i];//new Rect (offset , 0.0F, width, 1.0F);
UpdateImposter(rect, prototypes[i]);
}
oldCamera.StandaloneSetup();
}
// angleFactor - used for:
// 1) non-uniform scale compensation
// 2) blending between vertical (viewing from front) and horizontal (viewing from above/below) billboard modes
// offsetFactor - used for offsetting billboard from the ground when billboard is in horizontal mode
//
// See TerrainBillboardTree in TerrainEngine.cginc for more detailed explanation
void ImposterRenderTexture::GetBillboardParams(float& angleFactor, float& offsetFactor) const
{
float angles = Rad2Deg(m_AngleX);
angles = angles <= 90 ? angles : angles - 360;
AssertMsg(angles >= -90 && angles <= 90, "Invalid angle: %f", angles);
angleFactor = 1 - cos(Deg2Rad(angles));
{
// calculate modeFactor
const float kLimitAngle = 40;
float factor = fabsf(angles);
factor = factor < kLimitAngle ? 0 : SmoothStep(0, 1, (factor - kLimitAngle) / (90 - kLimitAngle));
// we never want to use bottom-center mode completely, because it can cause intersection
// of billboard with terrain, so we just raise it a bit all the time
offsetFactor = std::max(0.1f, factor);
}
}
void ImposterRenderTexture::UpdateImposter (const Rectf& rect, const TreeDatabase::Prototype& prototype)
{
if (prototype.imposterMaterials.empty()
|| !prototype.mesh.IsValid())
{
return;
}
{
Transform& transform = m_Camera->GetComponent (Transform);
// Setup camera location
transform.SetPosition(Vector3f (0, prototype.getCenterOffset(), 0));
// Just move far away enough to get the whole tree into the view. (How far doesnt matter since it is orthographic projection)
transform.SetPosition(transform.GetPosition() + transform.TransformDirection (-Vector3f::zAxis * (prototype.treeHeight + prototype.treeWidth) * 2));
}
// Setup camera rect
m_Camera->SetClearFlags(Camera::kDontClear);
m_Camera->SetNormalizedViewportRect(rect);
m_Camera->SetAspect(prototype.getBillboardAspect());
m_Camera->SetOrthographicSize(prototype.getBillboardHeight() * 0.5F);
// Setup render target
m_Camera->StandaloneRender(Camera::kRenderFlagDontRestoreRenderState | Camera::kRenderFlagSetRenderTarget, NULL, "");
const ShaderLab::FastPropertyName colorProperty = ShaderLab::Property("_Color");
const ShaderLab::FastPropertyName halfOverCutoffProperty = ShaderLab::Property("_HalfOverCutoff");
const ShaderLab::FastPropertyName terrainEngineBendTreeProperty = ShaderLab::Property("_TerrainEngineBendTree");
for (int m=0; m<prototype.imposterMaterials.size(); ++m)
{
const ColorRGBAf& color = prototype.originalMaterialColors[m];
float cutoff = prototype.inverseAlphaCutoff[m];
Material* mat = prototype.imposterMaterials[m];
mat->SetColor(colorProperty, color);
mat->SetFloat(halfOverCutoffProperty, cutoff);
mat->SetMatrix(terrainEngineBendTreeProperty, Matrix4x4f::identity);
for (int p=0; p<mat->GetPassCount(); ++p)
{
if (CheckShouldRenderPass (p, *mat))
{
const ChannelAssigns* channels = mat->SetPass(p);
if (channels)
{
DrawUtil::DrawMesh (*channels, *prototype.mesh, Vector3f::zero, Quaternionf::identity(), m);
}
}
}
}
}
#endif // ENABLE_TERRAIN
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