From 2a1dc2ba871803932e2da4d8534de0eeaeaaf347 Mon Sep 17 00:00:00 2001
From: fincs <fincs.alt1@gmail.com>
Date: Thu, 9 Feb 2017 19:59:46 +0100
Subject: [PATCH] Added C3D_FragOpShadow()

---
 include/c3d/effect.h | 1 +
 source/effect.c      | 7 +++++++
 source/internal.h    | 1 +
 3 files changed, 9 insertions(+)

diff --git a/include/c3d/effect.h b/include/c3d/effect.h
index b64cc73..b128921 100644
--- a/include/c3d/effect.h
+++ b/include/c3d/effect.h
@@ -11,3 +11,4 @@ void C3D_AlphaTest(bool enable, GPU_TESTFUNC function, int ref);
 void C3D_AlphaBlend(GPU_BLENDEQUATION colorEq, GPU_BLENDEQUATION alphaEq, GPU_BLENDFACTOR srcClr, GPU_BLENDFACTOR dstClr, GPU_BLENDFACTOR srcAlpha, GPU_BLENDFACTOR dstAlpha);
 void C3D_ColorLogicOp(GPU_LOGICOP op);
 void C3D_FragOpMode(GPU_FRAGOPMODE mode);
+void C3D_FragOpShadow(float scale, float bias);
diff --git a/source/effect.c b/source/effect.c
index 3b5db61..038f5f6 100644
--- a/source/effect.c
+++ b/source/effect.c
@@ -73,6 +73,12 @@ void C3D_FragOpMode(GPU_FRAGOPMODE mode)
 	e->fragOpMode |= 0xE40000 | mode;
 }
 
+void C3D_FragOpShadow(float scale, float bias)
+{
+	C3D_Effect* e = getEffect();
+	e->fragOpShadow = f32tof16(scale+bias) | (f32tof16(-scale)<<16);
+}
+
 void C3Di_EffectBind(C3D_Effect* e)
 {
 	GPUCMD_AddWrite(GPUREG_DEPTHMAP_ENABLE, e->zBuffer ? 1 : 0);
@@ -83,6 +89,7 @@ void C3Di_EffectBind(C3D_Effect* e)
 	GPUCMD_AddWrite(GPUREG_BLEND_FUNC, e->alphaBlend);
 	GPUCMD_AddWrite(GPUREG_LOGIC_OP, e->clrLogicOp);
 	GPUCMD_AddMaskedWrite(GPUREG_COLOR_OPERATION, 7, e->fragOpMode);
+	GPUCMD_AddWrite(GPUREG_FRAGOP_SHADOW, e->fragOpShadow);
 
 	// Disable early depth test?
 	GPUCMD_AddMaskedWrite(GPUREG_EARLYDEPTH_TEST1, 1, 0);
diff --git a/source/internal.h b/source/internal.h
index 3823abd..da1f7cd 100644
--- a/source/internal.h
+++ b/source/internal.h
@@ -10,6 +10,7 @@
 typedef struct
 {
 	u32 fragOpMode;
+	u32 fragOpShadow;
 	u32 zScale, zOffset;
 	GPU_CULLMODE cullMode;
 	bool zBuffer;