Encoding sort key depending on view mode.

src/bgfx.cpp

@@ -873,12 +873,19 @@ namespace bgfx
 			: _program.idx
 			;
 
-		m_key.m_depth  = (uint32_t)_depth;
-		m_key.m_view   = _id;
-		m_key.m_seq    = s_ctx->m_seq[_id] & s_ctx->m_seqMask[_id];
+		m_key.m_view = _id;
+
+		bool key1 = false;
+		switch (s_ctx->m_viewMode[_id])
+		{
+		case ViewMode::Sequential:      m_key.m_seq   = s_ctx->m_seq[_id];              break;
+		case ViewMode::DepthAscending:  m_key.m_depth = (uint32_t)_depth;  key1 = true; break;
+		case ViewMode::DepthDescending: m_key.m_depth = (uint32_t)-_depth; key1 = true; break;
+		default:                                                                        break;
+		}
 		s_ctx->m_seq[_id]++;
 
-		uint64_t key = m_key.encodeDraw();
+		uint64_t key = m_key.encodeDraw(key1);
 		m_sortKeys[m_num]   = key;
 		m_sortValues[m_num] = m_numRenderItems;
 		++m_num;

src/bgfx_p.h

@@ -839,7 +839,7 @@ namespace bgfx
 	//
 	struct SortKey
 	{
-		uint64_t encodeDraw(bool _key1 = false)
+		uint64_t encodeDraw(bool _key1)
 		{
 			if (_key1)
 			{
@@ -1486,7 +1486,7 @@ namespace bgfx
 			SortKey term;
 			term.reset();
 			term.m_program = kInvalidHandle;
-			m_sortKeys[BGFX_CONFIG_MAX_DRAW_CALLS]   = term.encodeDraw();
+			m_sortKeys[BGFX_CONFIG_MAX_DRAW_CALLS]   = term.encodeDraw(false);
 			m_sortValues[BGFX_CONFIG_MAX_DRAW_CALLS] = BGFX_CONFIG_MAX_DRAW_CALLS;
 			bx::memSet(m_occlusion, 0xff, sizeof(m_occlusion) );
 		}
@@ -3876,7 +3876,7 @@ namespace bgfx
 
 		BGFX_API_FUNC(void setViewMode(uint8_t _id, ViewMode::Enum _mode) )
 		{
-			m_seqMask[_id] = _mode == ViewMode::Sequential ? 0xffff : 0x0;
+			m_viewMode[_id] = uint8_t(_mode);
 		}
 
 		BGFX_API_FUNC(void setViewFrameBuffer(uint8_t _id, FrameBufferHandle _handle) )
@@ -4393,7 +4393,7 @@ namespace bgfx
 		Matrix4 m_proj[2][BGFX_CONFIG_MAX_VIEWS];
 		uint8_t m_viewFlags[BGFX_CONFIG_MAX_VIEWS];
 		uint16_t m_seq[BGFX_CONFIG_MAX_VIEWS];
-		uint16_t m_seqMask[BGFX_CONFIG_MAX_VIEWS];
+		uint8_t m_viewMode[BGFX_CONFIG_MAX_VIEWS];
 
 		uint8_t m_colorPaletteDirty;