general: Add depth buffering configuration function

Add depth buffering configuration.

Author: Warioware64

include/NEGeneral.h

@@ -227,6 +227,21 @@ void NE_ClippingPlanesSetI(int znear, int zfar);
 /// @param value true enables antialiasing, false disables it.
 void NE_AntialiasEnable(bool value);
 
+/// Depth buffering configuration for the 3D engine.
+typedef enum{
+    NE_ZBUFFERING = 0,
+    NE_WBUFFERING = (1 << 1)
+} NE_BufferingMode;
+
+/// Set the active depth buffering mode for 3D render.
+/// Z-buffering is default.
+///
+/// @param mode NE_ZBUFFERING or NE_WBUFFERING.
+void NE_SetDepthBufferingMode(NE_BufferingMode mode);
+
+/// Return the active depth buffering mode for 3D render.
+NE_BufferingMode NE_GetDepthBufferingMode(void)
+
 /// Returns the number of polygons drawn since the last glFlush().
 ///
 /// @return Returns the number of polygons (0 - 2048).

source/NEGeneral.c

@@ -32,6 +32,8 @@ static int fov;
 
 static int ne_main_screen = 1; // 1 = top, 0 = bottom
 
+static NE_BufferingMode ne_depth_buffering_mode = NE_ZBUFFERING; // Z_BUFFERING by default
+
 static uint32_t ne_dma_enabled = 0;
 static uint32_t ne_dma_src = 0;
 static uint32_t ne_dma_dst = 0;
@@ -245,6 +247,8 @@ static void ne_init_registers(void)
     GFX_FLUSH = 0;
     GFX_FLUSH = 0;
 
+    ne_depth_buffering_mode = NE_ZBUFFERING; // Set default Z-buffering
+
     NE_MainScreenSetOnTop();
     lcdMainOnTop();
 
@@ -314,6 +318,16 @@ void NE_UpdateInput(void)
         touchRead(&ne_input.touch);
 }
 
+void NE_SetDepthBufferingMode(NE_BufferingMode mode)
+{
+    ne_depth_buffering_mode = mode;
+}
+
+NE_BufferingMode NE_GetDepthBufferingMode(void)
+{
+    return ne_depth_buffering_mode;
+}
+
 int NE_Init3D(void)
 {
     NE_End();
@@ -622,7 +636,7 @@ void NE_Process(NE_Voidfunc drawscene)
     NE_AssertPointer(drawscene, "NULL function pointer");
     drawscene();
 
-    GFX_FLUSH = GL_TRANS_MANUALSORT;
+    GFX_FLUSH = GL_TRANS_MANUALSORT | ne_depth_buffering_mode;
 }
 
 void NE_ProcessArg(NE_VoidArgfunc drawscene, void *arg)
@@ -632,7 +646,7 @@ void NE_ProcessArg(NE_VoidArgfunc drawscene, void *arg)
     NE_AssertPointer(drawscene, "NULL function pointer");
     drawscene(arg);
 
-    GFX_FLUSH = GL_TRANS_MANUALSORT;
+    GFX_FLUSH = GL_TRANS_MANUALSORT | ne_depth_buffering_mode;
 }
 
 static void ne_process_dual_3d_common_start(void)
@@ -688,7 +702,7 @@ static void ne_process_dual_3d_common_start(void)
 
 static void ne_process_dual_3d_common_end(void)
 {
-    GFX_FLUSH = GL_TRANS_MANUALSORT;
+    GFX_FLUSH = GL_TRANS_MANUALSORT | ne_depth_buffering_mode;
 
     NE_Screen ^= 1;
 }
@@ -768,7 +782,7 @@ static void ne_process_dual_3d_fb_common_start(void)
 
 static void ne_process_dual_3d_fb_common_end(void)
 {
-    GFX_FLUSH = GL_TRANS_MANUALSORT;
+    GFX_FLUSH = GL_TRANS_MANUALSORT | ne_depth_buffering_mode;
 
     NE_Screen ^= 1;
 }
@@ -937,7 +951,7 @@ static void ne_process_dual_3d_dma_common_start(void)
 
 static void ne_process_dual_3d_dma_common_end(void)
 {
-    GFX_FLUSH = GL_TRANS_MANUALSORT;
+    GFX_FLUSH = GL_TRANS_MANUALSORT | ne_depth_buffering_mode;
 
     NE_Screen ^= 1;