BGE: Allow access to light shadow settings with python

This patch adds a new API which allow us to access light shadow settings from python. The new API can be used to write custom GLSL materials with shadows.

Reviewers: brecht, kupoman, agoose77, panzergame, campbellbarton, moguri, hg1

Reviewed By: agoose77, panzergame, campbellbarton, moguri, hg1

Projects: #game_engine

Differential Revision: https://developer.blender.org/D1690

3 files changed, 32 insertions, 0 deletions

diff --git a/source/gameengine/Rasterizer/RAS_ILightObject.h b/source/gameengine/Rasterizer/RAS_ILightObject.h
index f087f3bbb70..59475200a73 100644
--- a/source/gameengine/Rasterizer/RAS_ILightObject.h
+++ b/source/gameengine/Rasterizer/RAS_ILightObject.h
@@ -38,6 +38,7 @@ class KX_Camera;
 class KX_Scene;
 
 class MT_Transform;
+class MT_Matrix4x4;
 
 struct Image;
 
@@ -56,6 +57,13 @@ public:
 	
 	float	m_energy;
 	float	m_distance;
+	float	m_shadowclipstart;
+	float	m_shadowfrustumsize;
+	float	m_shadowclipend;
+	float	m_shadowbias;
+	float	m_shadowbleedbias;
+	short	m_shadowmaptype;
+	float	m_shadowcolor[3];
 
 	float	m_color[3];
 
@@ -74,6 +82,8 @@ public:
 	virtual RAS_ILightObject* Clone() = 0;
 
 	virtual bool HasShadowBuffer() = 0;
+	virtual int GetShadowBindCode() = 0;
+	virtual MT_Matrix4x4 GetShadowMatrix() = 0;
 	virtual int GetShadowLayer() = 0;
 	virtual void BindShadowBuffer(RAS_ICanvas *canvas, KX_Camera *cam, MT_Transform& camtrans) = 0;
 	virtual void UnbindShadowBuffer() = 0;
diff --git a/source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLLight.cpp b/source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLLight.cpp
index 8319b75331f..beb2d67f9f5 100644
--- a/source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLLight.cpp
+++ b/source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLLight.cpp
@@ -177,6 +177,26 @@ bool RAS_OpenGLLight::HasShadowBuffer()
 		return false;
 }
 
+int RAS_OpenGLLight::GetShadowBindCode()
+{
+	GPULamp *lamp;
+	
+	if ((lamp = GetGPULamp()))
+		return GPU_lamp_shadow_bind_code(lamp);
+	return -1;
+}
+
+MT_Matrix4x4 RAS_OpenGLLight::GetShadowMatrix()
+{
+	GPULamp *lamp;
+
+	if ((lamp = GetGPULamp()))
+		return MT_Matrix4x4(GPU_lamp_dynpersmat(lamp));
+	MT_Matrix4x4 mat;
+	mat.setIdentity();
+	return mat;
+}
+
 int RAS_OpenGLLight::GetShadowLayer()
 {
 	GPULamp *lamp;
diff --git a/source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLLight.h b/source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLLight.h
index 0c4e5bf41c4..a520b18c434 100644
--- a/source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLLight.h
+++ b/source/gameengine/Rasterizer/RAS_OpenGLRasterizer/RAS_OpenGLLight.h
@@ -46,6 +46,8 @@ public:
 	RAS_OpenGLLight* Clone() { return new RAS_OpenGLLight(*this); }
 
 	bool HasShadowBuffer();
+	int GetShadowBindCode();
+	MT_Matrix4x4 GetShadowMatrix();
 	int GetShadowLayer();
 	void BindShadowBuffer(RAS_ICanvas *canvas, KX_Camera *cam, MT_Transform& camtrans);
 	void UnbindShadowBuffer();