From a41dac3e3a813ee53c98a9d38fd2f2ede6c91e56 Mon Sep 17 00:00:00 2001
From: fincs <fincs.alt1@gmail.com>
Date: Sun, 2 Apr 2017 17:14:49 +0200
Subject: [PATCH] Add C3D_EarlyDepthTest()  {currently unusable due to glitchy
 rendering}

---
 include/c3d/effect.h |  1 +
 source/base.c        |  1 +
 source/effect.c      | 16 ++++++++++++----
 source/internal.h    |  4 +++-
 4 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/include/c3d/effect.h b/include/c3d/effect.h
index b128921..26e3617 100644
--- a/include/c3d/effect.h
+++ b/include/c3d/effect.h
@@ -6,6 +6,7 @@ void C3D_CullFace(GPU_CULLMODE mode);
 void C3D_StencilTest(bool enable, GPU_TESTFUNC function, int ref, int inputMask, int writeMask);
 void C3D_StencilOp(GPU_STENCILOP sfail, GPU_STENCILOP dfail, GPU_STENCILOP pass);
 void C3D_BlendingColor(u32 color);
+void C3D_EarlyDepthTest(bool enable, GPU_EARLYDEPTHFUNC function, u32 ref);
 void C3D_DepthTest(bool enable, GPU_TESTFUNC function, GPU_WRITEMASK writemask);
 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);
diff --git a/source/base.c b/source/base.c
index 2371e28..dfb2c12 100644
--- a/source/base.c
+++ b/source/base.c
@@ -104,6 +104,7 @@ bool C3D_Init(size_t cmdBufSize)
 	C3D_StencilTest(false, GPU_ALWAYS, 0x00, 0xFF, 0x00);
 	C3D_StencilOp(GPU_STENCIL_KEEP, GPU_STENCIL_KEEP, GPU_STENCIL_KEEP);
 	C3D_BlendingColor(0);
+	C3D_EarlyDepthTest(false, GPU_EARLYDEPTH_GREATER, 0);
 	C3D_DepthTest(true, GPU_GREATER, GPU_WRITE_ALL);
 	C3D_AlphaTest(false, GPU_ALWAYS, 0x00);
 	C3D_AlphaBlend(GPU_BLEND_ADD, GPU_BLEND_ADD, GPU_SRC_ALPHA, GPU_ONE_MINUS_SRC_ALPHA, GPU_SRC_ALPHA, GPU_ONE_MINUS_SRC_ALPHA);
diff --git a/source/effect.c b/source/effect.c
index 038f5f6..7142afe 100644
--- a/source/effect.c
+++ b/source/effect.c
@@ -39,6 +39,14 @@ void C3D_BlendingColor(u32 color)
 	e->blendClr = color;
 }
 
+void C3D_EarlyDepthTest(bool enable, GPU_EARLYDEPTHFUNC function, u32 ref)
+{
+	C3D_Effect* e = getEffect();
+	e->earlyDepth = enable;
+	e->earlyDepthFunc = function;
+	e->earlyDepthRef = ref;
+}
+
 void C3D_DepthTest(bool enable, GPU_TESTFUNC function, GPU_WRITEMASK writemask)
 {
 	C3D_Effect* e = getEffect();
@@ -90,8 +98,8 @@ void C3Di_EffectBind(C3D_Effect* e)
 	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);
-	GPUCMD_AddWrite(GPUREG_EARLYDEPTH_TEST2, 0);
+	GPUCMD_AddMaskedWrite(GPUREG_EARLYDEPTH_TEST1, 1, e->earlyDepth ? 1 : 0);
+	GPUCMD_AddWrite(GPUREG_EARLYDEPTH_TEST2, e->earlyDepth ? 1 : 0);
+	GPUCMD_AddMaskedWrite(GPUREG_EARLYDEPTH_FUNC, 1, e->earlyDepthFunc);
+	GPUCMD_AddMaskedWrite(GPUREG_EARLYDEPTH_DATA, 0x7, e->earlyDepthRef);
 }
diff --git a/source/internal.h b/source/internal.h
index 60aeb5a..e9321ac 100644
--- a/source/internal.h
+++ b/source/internal.h
@@ -14,7 +14,9 @@ typedef struct
 	u32 fragOpShadow;
 	u32 zScale, zOffset;
 	GPU_CULLMODE cullMode;
-	bool zBuffer;
+	bool zBuffer, earlyDepth;
+	GPU_EARLYDEPTHFUNC earlyDepthFunc;
+	u32 earlyDepthRef;
 
 	u32 alphaTest;
 	u32 stencilMode, stencilOp;