From e43939453d71deae40282a2e5af96026b673a58d Mon Sep 17 00:00:00 2001
From: msiglreith <m.siglreith@gmail.com>
Date: Wed, 18 Apr 2018 19:51:31 +0200
Subject: [PATCH] Implement push constant command

---
 libportability-gfx/src/impls.rs | 24 ++++++++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/libportability-gfx/src/impls.rs b/libportability-gfx/src/impls.rs
index 75c1ac9..227416e 100644
--- a/libportability-gfx/src/impls.rs
+++ b/libportability-gfx/src/impls.rs
@@ -3004,14 +3004,34 @@ pub extern "C" fn gfxCmdCopyQueryPoolResults(
 }
 #[inline]
 pub extern "C" fn gfxCmdPushConstants(
-    commandBuffer: VkCommandBuffer,
+    mut commandBuffer: VkCommandBuffer,
     layout: VkPipelineLayout,
     stageFlags: VkShaderStageFlags,
     offset: u32,
     size: u32,
     pValues: *const ::std::os::raw::c_void,
 ) {
-    unimplemented!()
+    assert_eq!(size % 4, 0);
+
+    let values = unsafe {
+        slice::from_raw_parts(pValues as *const u32, size as usize / 4)
+    };
+
+    if stageFlags & VkShaderStageFlagBits::VK_SHADER_STAGE_COMPUTE_BIT as u32 != 0 {
+        commandBuffer.push_compute_constants(
+            &*layout,
+            offset,
+            values,
+        );
+    }
+    if stageFlags & VkShaderStageFlagBits::VK_SHADER_STAGE_ALL_GRAPHICS as u32 != 0 {
+        commandBuffer.push_graphics_constants(
+            &*layout,
+            conv::map_stage_flags(stageFlags),
+            offset,
+            values,
+        );
+    }
 }
 #[inline]
 pub extern "C" fn gfxCmdBeginRenderPass(