From 4814f804c61206b8431bc0eec06257c5ebb77a16 Mon Sep 17 00:00:00 2001
From: fincs <fincs.alt1@gmail.com>
Date: Sat, 28 Nov 2015 15:56:20 +0100
Subject: [PATCH] Add missing fragment lighting functionality

---
 include/c3d/light.h | 15 +++++++++++++++
 source/light.c      | 12 +++++++++++-
 source/lightenv.c   | 47 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+), 1 deletion(-)

diff --git a/include/c3d/light.h b/include/c3d/light.h
index f07141c..67b492c 100644
--- a/include/c3d/light.h
+++ b/include/c3d/light.h
@@ -66,6 +66,21 @@ void C3D_LightEnvMaterial(C3D_LightEnv* env, const C3D_Material* mtl);
 void C3D_LightEnvAmbient(C3D_LightEnv* env, float r, float g, float b);
 void C3D_LightEnvLut(C3D_LightEnv* env, int lutId, int input, bool abs, C3D_LightLut* lut);
 
+enum
+{
+	GPU_SHADOW_PRIMARY   = BIT(16),
+	GPU_SHADOW_SECONDARY = BIT(17),
+	GPU_INVERT_SHADOW    = BIT(18),
+	GPU_SHADOW_ALPHA     = BIT(19),
+};
+
+void C3D_LightEnvFresnel(C3D_LightEnv* env, GPU_FRESNELSEL selector);
+void C3D_LightEnvBumpMode(C3D_LightEnv* env, GPU_BUMPMODE mode);
+void C3D_LightEnvBumpSel(C3D_LightEnv* env, int texUnit);
+void C3D_LightEnvShadowMode(C3D_LightEnv* env, u32 mode);
+void C3D_LightEnvShadowSel(C3D_LightEnv* env, int texUnit);
+void C3D_LightEnvClampHighlights(C3D_LightEnv* env, bool clamp);
+
 //-----------------------------------------------------------------------------
 // Light
 //-----------------------------------------------------------------------------
diff --git a/source/light.c b/source/light.c
index f9e4b96..33b7f9f 100644
--- a/source/light.c
+++ b/source/light.c
@@ -1,5 +1,6 @@
 #include <string.h>
 #include "context.h"
+#include <c3d/maths.h>
 
 void C3Di_LightMtlBlend(C3D_Light* light)
 {
@@ -113,10 +114,19 @@ void C3D_LightSpotEnable(C3D_Light* light, bool enable)
 	C3Di_EnableCommon(light, enable, GPU_LC1_SPOTBIT(light->id));
 }
 
+static inline u16 floattofix2_11(float x)
+{
+	return (u16)((s32)(x * (1U<<11)) & 0x1FFF);
+}
+
 void C3D_LightSpotDir(C3D_Light* light, float x, float y, float z)
 {
 	C3Di_EnableCommon(light, true, GPU_LC1_SPOTBIT(light->id));
-	// TODO
+	C3D_FVec vec = { { 0.0, -z, -y, -x } };
+	FVec_Norm4(&vec);
+	light->conf.spotDir[0] = floattofix2_11(vec.x);
+	light->conf.spotDir[1] = floattofix2_11(vec.y);
+	light->conf.spotDir[2] = floattofix2_11(vec.z);
 	light->flags |= C3DF_Light_Dirty;
 }
 
diff --git a/source/lightenv.c b/source/lightenv.c
index d580cd7..31bbe9e 100644
--- a/source/lightenv.c
+++ b/source/lightenv.c
@@ -221,3 +221,50 @@ void C3D_LightEnvLut(C3D_LightEnv* env, int lutId, int input, bool abs, C3D_Ligh
 
 	env->flags |= C3DF_LightEnv_Dirty;
 }
+
+void C3D_LightEnvFresnel(C3D_LightEnv* env, GPU_FRESNELSEL selector)
+{
+	env->conf.config[0] &= ~(3<<2);
+	env->conf.config[0] |= (selector&3)<<2;
+	env->flags |= C3DF_LightEnv_Dirty;
+}
+
+void C3D_LightEnvBumpMode(C3D_LightEnv* env, GPU_BUMPMODE mode)
+{
+	env->conf.config[0] &= ~(3<<28);
+	env->conf.config[0] |= (mode&3)<<28;
+	env->flags |= C3DF_LightEnv_Dirty;
+}
+
+void C3D_LightEnvBumpSel(C3D_LightEnv* env, int texUnit)
+{
+	env->conf.config[0] &= ~(3<<22);
+	env->conf.config[0] |= (texUnit&3)<<22;
+	env->flags |= C3DF_LightEnv_Dirty;
+}
+
+void C3D_LightEnvShadowMode(C3D_LightEnv* env, u32 mode)
+{
+	mode &= 0xF<<16;
+	if (mode & (GPU_SHADOW_PRIMARY | GPU_INVERT_SHADOW | GPU_SHADOW_ALPHA))
+		mode |= BIT(0);
+	env->conf.config[0] &= ~((3<<28) | BIT(0));
+	env->conf.config[0] |= mode;
+	env->flags |= C3DF_LightEnv_Dirty;
+}
+
+void C3D_LightEnvShadowSel(C3D_LightEnv* env, int texUnit)
+{
+	env->conf.config[0] &= ~(3<<24);
+	env->conf.config[0] |= (texUnit&3)<<24;
+	env->flags |= C3DF_LightEnv_Dirty;
+}
+
+void C3D_LightEnvClampHighlights(C3D_LightEnv* env, bool clamp)
+{
+	if (clamp)
+		env->conf.config[0] |= BIT(27);
+	else
+		env->conf.config[0] &= ~BIT(27);
+	env->flags |= C3DF_LightEnv_Dirty;
+}