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Vulkan: Handle both destination alpha and logic ops being enabled 

Same way as GL with the dual-pass fallback. Not highly accurate, but does
fix the Kirby shadow bug.
This commit is contained in:
Stenzek 2016-10-02 23:56:55 +10:00
parent f595fe080f
commit 28e5fa8d26
1 changed files with 8 additions and 2 deletions
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10
Source/Core/VideoBackends/Vulkan/VertexManager.cpp
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@ -198,8 +198,14 @@ void VertexManager::vFlush(bool use_dst_alpha)
vkCmdDrawIndexed(g_command_buffer_mgr->GetCurrentCommandBuffer(), index_count, 1,
m_current_draw_base_index, m_current_draw_base_vertex, 0);
// If we can't do single pass dst alpha, we now need to draw the alpha pass.
if (use_dst_alpha && !g_vulkan_context->SupportsDualSourceBlend())
// If the GPU does not support dual-source blending, we can approximate the effect by drawing
// the object a second time, with the write mask set to alpha only using a shader that outputs
// the destination/constant alpha value (which would normally be SRC_COLOR.a).
//
// This is also used when logic ops and destination alpha is enabled, since we can't enable
// blending and logic ops concurrently (and the logical operation applies to all channels).
bool logic_op_enabled = bpmem.blendmode.logicopenable && !bpmem.blendmode.blendenable;
if (use_dst_alpha && (!g_vulkan_context->SupportsDualSourceBlend() || logic_op_enabled))
{
m_state_tracker->CheckForShaderChanges(m_current_primitive_type, DSTALPHA_ALPHA_PASS);
if (!m_state_tracker->Bind())