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#include "UnityPrefix.h"
#include "Skybox.h"
#include "Runtime/Serialize/TransferFunctions/SerializeTransfer.h"
#include "Camera.h"
#include "CameraUtil.h"
#include "Runtime/Shaders/Material.h"
#include "External/shaderlab/Library/intshader.h"
#include "Runtime/Shaders/Shader.h"
#include "Runtime/GfxDevice/GfxDevice.h"
#include "Runtime/Shaders/VBO.h"
#include "Runtime/Profiler/ExternalGraphicsProfiler.h"
PROFILER_INFORMATION(gRenderSkyboxProfile, "Camera.RenderSkybox", kProfilerRender);
using namespace ShaderLab;
enum
{
kSkyboxVertexChannels = (1<<kShaderChannelVertex) | (1<<kShaderChannelTexCoord0)
};
struct SkyboxVertex {
float x, y, z;
float tu, tv;
};
const int kSkyboxVertexCount = 6*4;
static const SkyboxVertex kSkyboxVB[kSkyboxVertexCount] = {
{ -1, 1, 1, 0,1 }, { 1, 1, 1, 1,1 }, { 1, -1, 1, 1,0 }, { -1, -1, 1, 0,0 },
{ 1, 1, -1, 0,1 }, { -1, 1, -1, 1,1 }, { -1, -1, -1, 1,0 }, { 1, -1, -1, 0,0 },
{ 1, 1, 1, 0,1 }, { 1, 1, -1, 1,1 }, { 1, -1, -1, 1,0 }, { 1, -1, 1, 0,0 },
{ -1, 1, -1, 0,1 }, { -1, 1, 1, 1,1 }, { -1, -1, 1, 1,0 }, { -1, -1, -1, 0,0 },
{ -1, 1, -1, 0,1 }, { 1, 1, -1, 1,1 }, { 1, 1, 1, 1,0 }, { -1, 1, 1, 0,0 },
{ -1, -1, 1, 0,1 }, { 1, -1, 1, 1,1 }, { 1, -1, -1, 1,0 }, { -1, -1, -1, 0,0 },
};
const int kSkyplaneVertexCount = 4;
static const SkyboxVertex kSkyplaneVB[kSkyplaneVertexCount] = {
{ 1, 1, -1, 0,1 }, { -1, 1, -1, 1,1 }, { -1, -1, -1, 1,0 }, { 1, -1, -1, 0,0 },
};
Skybox::Skybox (MemLabelId label, ObjectCreationMode mode)
: Super(label, mode)
{
}
Skybox::~Skybox ()
{
}
void Skybox::AddToManager ()
{
}
void Skybox::RemoveFromManager ()
{
}
void Skybox::RenderSkybox (Material* mat, const Camera& camera)
{
if( !mat )
return;
PROFILER_AUTO_GFX(gRenderSkyboxProfile, &camera)
Shader* shader = mat->GetShader();
Assert (shader);
GfxDevice& device = GetGfxDevice();
DeviceMVPMatricesState preserveMVP;
#if UNITY_WP8
void RotateScreenIfNeeded(Matrix4x4f& mat);
#endif
if (camera.GetOrthographic())
{
const float epsilon = 1e-6f;
const float nearPlane = camera.GetNear () * 0.01f;
const float dist = camera.GetFar() * 10.0f;
// Make Ortho matrix which passes W to Z
Matrix4x4f projection = Matrix4x4f::identity;
//camera.GetImplicitProjectionMatrix( nearPlane, projection );
projection.Get(2, 2) = -1.0f + epsilon;
projection.Get(2, 3) = (-2.0f + epsilon) * nearPlane;
projection.Get(3, 2) = -1.0f;
#if UNITY_WP8
if (!RenderTexture::GetActive()) {
RotateScreenIfNeeded(projection);
}
#endif
Matrix4x4f matrix = Matrix4x4f::identity;
//device.SetViewMatrix(matrix.GetPtr());
matrix.SetScale(Vector3f(dist,dist,dist));
matrix.SetPosition( camera.GetPosition() );
device.SetWorldMatrix(matrix.GetPtr());
device.SetProjectionMatrix(projection);
}
else
{
// Modify Projection matrix to make Infinite Projection Matrix (which passes W into Z)
// perspective divide will lend ZBuffer value to always be 1.0 (all points on far plane)
// NOTE: However we need to compensate on floating point precision errors
// by bringing Z slightly closer to viewer by adding Epsilon
// See "Projection Matrix Tricks" by Eric Lengyel GDC2007
// http://www.terathon.com/gdc07_lengyel.ppt
// In order to avoid clipping of skybox polys we increase skybox size and pull NearPlane as close as possible
// Higher epsilon values that Z/W < 1.0, but drastically reduces zBuffer precision close to FarPlane
// Epsilon 1e-6 gives good results as long as NearPlane >= 0.05
const float epsilon = 1e-6f;
const float nearPlane = camera.GetNear () * 0.01f;
const float dist = camera.GetFar() * 10.0f;
Matrix4x4f projection;
camera.GetImplicitProjectionMatrix( nearPlane, projection );
projection.Get(2, 2) = -1.0f + epsilon;
projection.Get(2, 3) = (-2.0f + epsilon) * nearPlane;
projection.Get(3, 2) = -1.0f;
#if UNITY_WP8
if (!RenderTexture::GetActive()) {
RotateScreenIfNeeded(projection);
}
#endif
Matrix4x4f matrix = Matrix4x4f::identity;
matrix.SetScale( Vector3f(dist,dist,dist) );
matrix.SetPosition( camera.GetPosition() );
device.SetWorldMatrix( matrix.GetPtr() );
device.SetProjectionMatrix(projection);
}
ShaderLab::IntShader* slshader = shader->GetShaderLabShader();
const int passCount = slshader->GetActiveSubShader().GetValidPassCount();
if( passCount == 6 )
{
// regular skybox with 6 separate textures per face
DynamicVBO& vbo = device.GetDynamicVBO();
for( int j = 0; j < 6; j++ )
{
SkyboxVertex* vbPtr = 0;
if(vbo.GetChunk(kSkyboxVertexChannels, 4, 0, DynamicVBO::kDrawQuads, (void**)&vbPtr, NULL))
{
vbPtr[0] = kSkyboxVB[4*j+0];
vbPtr[1] = kSkyboxVB[4*j+1];
vbPtr[2] = kSkyboxVB[4*j+2];
vbPtr[3] = kSkyboxVB[4*j+3];
vbo.ReleaseChunk(4, 0);
const ChannelAssigns* channels = mat->SetPassWithShader( j, shader, 0 );
vbo.DrawChunk (*channels);
GPU_TIMESTAMP();
}
}
}
else
{
// cube mapped skybox
for (int pass = 0; pass < passCount; pass++)
{
mat->SetPassWithShader( pass, shader, 0 );
device.ImmediateBegin( kPrimitiveQuads );
const SkyboxVertex* verts = kSkyboxVB;
for ( int i = 0; i < kSkyboxVertexCount; i++ ) {
device.ImmediateTexCoordAll( verts->x, verts->y, verts->z );
device.ImmediateVertex( verts->x, verts->y, verts->z );
++verts;
}
device.ImmediateEnd();
GPU_TIMESTAMP();
}
}
}
void Skybox::SetMaterial (Material* material) {
m_CustomSkybox = material;
}
Material* Skybox::GetMaterial ()const {
return m_CustomSkybox;
}
template<class TransferFunction>
void Skybox::Transfer (TransferFunction& transfer) {
Super::Transfer (transfer);
TRANSFER_SIMPLE (m_CustomSkybox);
}
IMPLEMENT_CLASS (Skybox)
IMPLEMENT_OBJECT_SERIALIZE (Skybox)
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