From 4143801891f763e2fb1bcf9f828c3c34035d7e0d Mon Sep 17 00:00:00 2001
From: Florent Castelli <florent.castelli@gmail.com>
Date: Sun, 25 Nov 2012 00:15:21 +0100
Subject: [PATCH] Handle depth range (zmin, zmax) in a hackish way

---
 GPU/GLES/DisplayListInterpreter.cpp | 20 ++++++++++++++------
 GPU/GLES/TransformPipeline.cpp      |  2 ++
 GPU/GPUState.h                      |  5 +++--
 3 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/GPU/GLES/DisplayListInterpreter.cpp b/GPU/GLES/DisplayListInterpreter.cpp
index 69b20b5c21..94752b8144 100644
--- a/GPU/GLES/DisplayListInterpreter.cpp
+++ b/GPU/GLES/DisplayListInterpreter.cpp
@@ -588,12 +588,14 @@ void GLES_GPU::ExecuteOp(u32 op, u32 diff)
 		}
 		break;
 
-	case GE_CMD_MINZ: 
-		DEBUG_LOG(G3D, "DL MinZ: %i", data);
+	case GE_CMD_MINZ:
+		gstate_c.zMin = getFloat24(data) / 65535.f;
+		DEBUG_LOG(G3D, "DL MinZ: %i", gstate_c.zMin);
 		break;
 
-	case GE_CMD_MAXZ: 
-		DEBUG_LOG(G3D, "DL MaxZ: %i", data);
+	case GE_CMD_MAXZ:
+		gstate_c.zMax = getFloat24(data) / 65535.f;
+		DEBUG_LOG(G3D, "DL MaxZ: %i", gstate_c.zMax);
 		break;
 
 	case GE_CMD_FRAMEBUFPTR:
@@ -850,12 +852,18 @@ void GLES_GPU::ExecuteOp(u32 op, u32 diff)
 
 	case GE_CMD_VIEWPORTX1:
 	case GE_CMD_VIEWPORTY1:
-	case GE_CMD_VIEWPORTZ1:
 	case GE_CMD_VIEWPORTX2:
 	case GE_CMD_VIEWPORTY2:
-	case GE_CMD_VIEWPORTZ2:
 		DEBUG_LOG(G3D,"DL Viewport param %i: %f", cmd-GE_CMD_VIEWPORTX1, getFloat24(data));
 		break;
+	case GE_CMD_VIEWPORTZ1:
+		gstate_c.zScale = getFloat24(data) / 65535.f;
+		DEBUG_LOG(G3D,"DL Z scale: %f", gstate_c.zScale);
+		break;
+	case GE_CMD_VIEWPORTZ2:
+		gstate_c.zOff = getFloat24(data) / 65535.f;
+		DEBUG_LOG(G3D,"DL Z pos: %f", gstate_c.zOff);
+		break;
 	case GE_CMD_LIGHTENABLE0:
 	case GE_CMD_LIGHTENABLE1:
 	case GE_CMD_LIGHTENABLE2:
diff --git a/GPU/GLES/TransformPipeline.cpp b/GPU/GLES/TransformPipeline.cpp
index 109f76575b..9eeb8d25e5 100644
--- a/GPU/GLES/TransformPipeline.cpp
+++ b/GPU/GLES/TransformPipeline.cpp
@@ -557,6 +557,8 @@ void TransformAndDrawPrim(void *verts, void *inds, int prim, int vertexCount, Li
 		glstate.depthFunc.set(ztests[depthTestFunc]);
 	}
 
+	glstate.depthRange.set(gstate_c.zOff - gstate_c.zScale, gstate_c.zOff + gstate_c.zScale);
+
 	glEnableVertexAttribArray(program->a_position);
 	if (useTexCoord && program->a_texcoord != -1) glEnableVertexAttribArray(program->a_texcoord);
 	if (program->a_color0 != -1) glEnableVertexAttribArray(program->a_color0);
diff --git a/GPU/GPUState.h b/GPU/GPUState.h
index 058d3887bb..4314a641f6 100644
--- a/GPU/GPUState.h
+++ b/GPU/GPUState.h
@@ -260,8 +260,9 @@ struct GPUStateCache
 
 	bool textureChanged;
 
-	float uScale,vScale;
-	float uOff,vOff;
+	float uScale,vScale,zScale;
+	float uOff,vOff,zOff;
+	float zMin, zMax;
 	float lightpos[4][3];
 	float lightdir[4][3];
 	float lightatt[4][3];