From bcccdeaec859baef596d72adae46c383e51bb3ce Mon Sep 17 00:00:00 2001
From: Rene Lindsay <rene@lunarg.com>
Date: Fri, 12 Aug 2016 17:56:09 -0600
Subject: demos : SAM6 Flip projection matrix, instead of vertex-shader

Change-Id: I0000000000decaf15bad0000000000000000006b
---
 demos/cube.c    | 2 ++
 demos/cube.vert | 4 ----
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/demos/cube.c b/demos/cube.c
index 17617e5e..5c4a6dc7 100644
--- a/demos/cube.c
+++ b/demos/cube.c
@@ -3040,6 +3040,8 @@ static void demo_init(struct demo *demo, int argc, char **argv) {
                        1.0f, 0.1f, 100.0f);
     mat4x4_look_at(demo->view_matrix, eye, origin, up);
     mat4x4_identity(demo->model_matrix);
+
+    demo->projection_matrix[1][1]*=-1;  //Flip projection matrix from GL to Vulkan orientation.
 }
 
 #if defined(VK_USE_PLATFORM_WIN32_KHR)
diff --git a/demos/cube.vert b/demos/cube.vert
index c09899b4..1e67f758 100644
--- a/demos/cube.vert
+++ b/demos/cube.vert
@@ -37,8 +37,4 @@ void main()
 {
    texcoord = ubuf.attr[gl_VertexIndex];
    gl_Position = ubuf.MVP * ubuf.position[gl_VertexIndex];
-
-   // GL->VK conventions
-   gl_Position.y = -gl_Position.y;
-   gl_Position.z = (gl_Position.z + gl_Position.w) / 2.0;
 }
-- 
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