From 16d32f32ed93b06d56396f75e3738d9687b891b9 Mon Sep 17 00:00:00 2001
From: N0NameN0 <alonetrio@yahoo.com>
Date: Mon, 10 May 2010 22:37:34 +0000
Subject: [PATCH] [ADD] I finnaly commiting GRRLIB_SetLightSpot ;)

---
 GRRLIB/GRRLIB/GRRLIB_3D.c          | 39 ++++++++++++++++++++++++++++++
 GRRLIB/GRRLIB/grrlib/GRRLIB__lib.h |  1 +
 2 files changed, 40 insertions(+)

diff --git a/GRRLIB/GRRLIB/GRRLIB_3D.c b/GRRLIB/GRRLIB/GRRLIB_3D.c
index 0ca028f..be5346e 100644
--- a/GRRLIB/GRRLIB/GRRLIB_3D.c
+++ b/GRRLIB/GRRLIB/GRRLIB_3D.c
@@ -700,6 +700,45 @@ void GRRLIB_SetLightSpec(u8 num, guVector dir, f32 shy, u32 lightcolor, u32 spec
     GX_SetChanMatColor(GX_COLOR1, (GXColor) { R(speccolor), G(speccolor), B(speccolor), 0xFF }); // couleur du reflet specular
 }
 
+/**
+ * Set Spot light parameters.
+ * @param num Number of the light. It's a number from 0 to 7.
+ * @param pos Position of the spot light (x/y/z).
+ * @param lookat Where spot light look at (x/y/z).
+ * @param angAttn0 cone attenuation factor 0.
+ * @param angAttn1 cone attenuation factor 1.
+ * @param angAttn2 cone attenuation factor 2.
+ * @param distAttn0 Distance attenuation factor 0.
+ * @param distAttn1 Distance attenuation factor 1.
+ * @param distAttn2 Distance attenuation factor 2.
+ * @param lightcolor Color of the light in RGBA format.
+*/
+void GRRLIB_SetLightSpot(u8 num, guVector pos, guVector lookat, f32 angAttn0, f32 angAttn1, f32 angAttn2, f32 distAttn0, f32 distAttn1, f32 distAttn2, u32 lightcolor) {
+	GXLightObj lobj;
+        guVector lpos = (guVector){ pos.x, pos.y, pos.z };
+        guVector ldir = (guVector){ lookat.x-pos.x, lookat.y-pos.y, lookat.z-pos.z };
+	guVecNormalize(&ldir);
+
+        GRRLIB_Settings.lights |= (1<<num);
+
+        guVecMultiplySR(_GRR_view, &ldir,&ldir);
+        guVecMultiply(_GRR_view, &lpos, &lpos);
+
+        GX_InitLightDirv(&lobj, &ldir);
+        GX_InitLightPosv(&lobj, &lpos);
+        GX_InitLightColor(&lobj, (GXColor) { R(lightcolor), G(lightcolor), B(lightcolor), 0xFF });
+
+	//this is just for code readers, wanting to know how to use direct cut off
+        //GX_InitLightSpot(&lobj, 0<angle<90, GX_SP_FLAT);
+
+        GX_InitLightAttn(&lobj, angAttn0, angAttn1, angAttn2, distAttn0, distAttn1, distAttn2);
+
+        GX_LoadLightObj(&lobj, (1<<num));
+
+	// Turn light ON
+    	GX_SetNumChans(1);
+    	GX_SetChanCtrl(GX_COLOR0A0, GX_ENABLE, GX_SRC_REG, GX_SRC_VTX, GRRLIB_Settings.lights, GX_DF_CLAMP, GX_AF_SPOT);
+}
 
 /**
  * Set all lights off, like at init.
diff --git a/GRRLIB/GRRLIB/grrlib/GRRLIB__lib.h b/GRRLIB/GRRLIB/grrlib/GRRLIB__lib.h
index f3fdfb0..e8adc39 100644
--- a/GRRLIB/GRRLIB/grrlib/GRRLIB__lib.h
+++ b/GRRLIB/GRRLIB/grrlib/GRRLIB__lib.h
@@ -167,6 +167,7 @@ void GRRLIB_DrawTessPanel(f32 w, f32 wstep, f32 h, f32 hstep, bool filled, u32 c
 void GRRLIB_SetLightAmbient(u32 ambientcolor);
 void GRRLIB_SetLightDiff(u8 num, guVector pos, f32 distattn, f32 brightness, u32 lightcolor);
 void GRRLIB_SetLightSpec(u8 num, guVector dir, f32 shy, u32 lightcolor, u32 speccolor);
+void GRRLIB_SetLightSpot(u8 num, guVector pos, guVector lookat, f32 angAttn0, f32 angAttn1, f32 angAttn2, f32 distAttn0, f32 distAttn1, f32 distAttn2, u32 lightcolor);
 void GRRLIB_SetLightOff(void);
 
 //------------------------------------------------------------------------------