1 files changed, 63 insertions, 0 deletions
diff --git a/LibOVR/Src/CAPI/D3D1X/Shaders/DistortionTimewarp_vs.vsh b/LibOVR/Src/CAPI/D3D1X/Shaders/DistortionTimewarp_vs.vsh
new file mode 100644
index 0000000..d594042
--- /dev/null
+++ b/LibOVR/Src/CAPI/D3D1X/Shaders/DistortionTimewarp_vs.vsh
@@ -0,0 +1,63 @@
+/************************************************************************************
+
+Filename    :   DistortionTimewarp_vs.vsh
+
+Copyright   :   Copyright 2014 Oculus VR, LLC All Rights reserved.
+
+Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License"); 
+you may not use the Oculus VR Rift SDK except in compliance with the License, 
+which is provided at the time of installation or download, or which 
+otherwise accompanies this software in either electronic or hard copy form.
+
+You may obtain a copy of the License at
+
+http://www.oculusvr.com/licenses/LICENSE-3.2 
+
+Unless required by applicable law or agreed to in writing, the Oculus VR SDK 
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+************************************************************************************/
+
+float2   EyeToSourceUVScale;
+float2   EyeToSourceUVOffset;
+float4x4 EyeRotationStart;
+float4x4 EyeRotationEnd;
+
+float2 TimewarpTexCoordToWarpedPos(float2 inTexCoord, float4x4 rotMat)
+{
+    // Vertex inputs are in TanEyeAngle space for the R,G,B channels (i.e. after chromatic aberration and distortion).
+    // These are now "real world" vectors in direction (x,y,1) relative to the eye of the HMD.    
+    // Apply the 3x3 timewarp rotation to these vectors.
+	float3 transformed = float3( mul ( rotMat, float4(inTexCoord,1,1) ).xyz);
+    // Project them back onto the Z=1 plane of the rendered images.
+	float2 flattened = transformed.xy / transformed.z;
+    // Scale them into ([0,0.5],[0,1]) or ([0.5,0],[0,1]) UV lookup space (depending on eye)
+	return flattened * EyeToSourceUVScale + EyeToSourceUVOffset;
+	
+}
+
+void main(in float2 Position    : POSITION,
+          in float4 Color       : COLOR0,
+          in float2 TexCoord0   : TEXCOORD0,    
+          out float4 oPosition  : SV_Position,
+          out float1 oColor     : COLOR,
+          out float2 oTexCoord0 : TEXCOORD0)
+{
+
+    oPosition.x = Position.x;
+    oPosition.y = Position.y;
+    oPosition.z = 0.5;
+    oPosition.w = 1.0;
+
+    float timewarpLerpFactor = Color.a;
+    float4x4 lerpedEyeRot = lerp(EyeRotationStart, EyeRotationEnd, timewarpLerpFactor);	
+
+    // Warped positions are a bit more involved, hence a separate function
+	oTexCoord0 = TimewarpTexCoordToWarpedPos(TexCoord0, lerpedEyeRot);
+    oColor = Color.r;              // Used for vignette fade.
+}
+
+