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Added custom Oculus CV1 parameters 

Matching the same stereo rendering result given by Oculus PC SDK for
Oculus Rift CV1 is very difficult because hardware has changed a lot and
DK2 distortion shader and parameters don't fit on CV1. Some custom
parameters have been calculated to simulate kind of CV1 stereo
rendering. Further work is required on this point.
pull/132/head
Ray 8 years ago
parent
24c267d324
commit
84d1b19f61
2 changed files with 65 additions and 35 deletions
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  1. +4
    -2
      examples/core_oculus_rift.c
  2. +61
    -33
      src/rlgl.c

+ 4
- 2
examples/core_oculus_rift.c View File

@ -18,8 +18,10 @@ int main()
{
// Initialization
//--------------------------------------------------------------------------------------
int screenWidth = 1280;
int screenHeight = 800;
int screenWidth = 1080;
int screenHeight = 600;
// NOTE: screenWidth/screenHeight should match VR device aspect ratio
InitWindow(screenWidth, screenHeight, "raylib [core] example - oculus rift");

+ 61
- 33
src/rlgl.c View File

@ -2570,38 +2570,62 @@ void InitVrDevice(int hmdDevice)
if (!vrDeviceReady)
{
TraceLog(WARNING, "VR Device not found: Initializing VR Simulator (Oculus Rift DK2)");
TraceLog(WARNING, "VR Device not found: Initializing VR Simulator (Oculus Rift CV1)");
if (hmdDevice == HMD_OCULUS_RIFT_DK2)
{
// Oculus Rift DK2 parameters
hmd.hResolution = 1280; // HMD horizontal resolution in pixels
hmd.vResolution = 800; // HMD vertical resolution in pixels
hmd.hScreenSize = 0.14976f; // HMD horizontal size in meters
hmd.vScreenSize = 0.09356f; // HMD vertical size in meters
hmd.vScreenCenter = 0.04678f; // HMD screen center in meters
hmd.eyeToScreenDistance = 0.041f; // HMD distance between eye and display in meters
hmd.lensSeparationDistance = 0.0635f; // HMD lens separation distance in meters
hmd.interpupillaryDistance = 0.064f; // HMD IPD (distance between pupils) in meters
hmd.distortionK[0] = 1.0f; // HMD lens distortion constant parameter 0
hmd.distortionK[1] = 0.22f; // HMD lens distortion constant parameter 1
hmd.distortionK[2] = 0.24f; // HMD lens distortion constant parameter 2
hmd.distortionK[3] = 0.0f; // HMD lens distortion constant parameter 3
hmd.chromaAbCorrection[0] = 0.996f; // HMD chromatic aberration correction parameter 0
hmd.chromaAbCorrection[1] = -0.004f; // HMD chromatic aberration correction parameter 1
hmd.chromaAbCorrection[2] = 1.014f; // HMD chromatic aberration correction parameter 2
hmd.chromaAbCorrection[3] = 0.0f; // HMD chromatic aberration correction parameter 3
}
else if ((hmdDevice == HMD_DEFAULT_DEVICE) || (hmdDevice == HMD_OCULUS_RIFT_CV1))
{
// Oculus Rift CV1 parameters
// NOTE: CV1 represents a complete HMD redesign compared to previous versions,
// new Fresnel-hybrid-asymmetric lenses have been added and, consequently,
// previous parameters (DK2) and distortion shader (DK2) doesn't work any more.
// I just defined a set of parameters for simulator that approximate to CV1 stereo rendering
// but result is not the same obtained with Oculus PC SDK.
hmd.hResolution = 2160; // HMD horizontal resolution in pixels
hmd.vResolution = 1200; // HMD vertical resolution in pixels
hmd.hScreenSize = 0.133793f; // HMD horizontal size in meters
hmd.vScreenSize = 0.0669; // HMD vertical size in meters
hmd.vScreenCenter = 0.04678f; // HMD screen center in meters
hmd.eyeToScreenDistance = 0.041f; // HMD distance between eye and display in meters
hmd.lensSeparationDistance = 0.07f; // HMD lens separation distance in meters
hmd.interpupillaryDistance = 0.07f; // HMD IPD (distance between pupils) in meters
hmd.distortionK[0] = 1.0f; // HMD lens distortion constant parameter 0
hmd.distortionK[1] = 0.22f; // HMD lens distortion constant parameter 1
hmd.distortionK[2] = 0.24f; // HMD lens distortion constant parameter 2
hmd.distortionK[3] = 0.0f; // HMD lens distortion constant parameter 3
hmd.chromaAbCorrection[0] = 0.996f; // HMD chromatic aberration correction parameter 0
hmd.chromaAbCorrection[1] = -0.004f; // HMD chromatic aberration correction parameter 1
hmd.chromaAbCorrection[2] = 1.014f; // HMD chromatic aberration correction parameter 2
hmd.chromaAbCorrection[3] = 0.0f; // HMD chromatic aberration correction parameter 3
}
// Initialize framebuffer and textures for stereo rendering
// NOTE: screen size should match HMD aspect ratio
vrConfig.stereoFbo = rlglLoadRenderTexture(screenWidth, screenHeight);
// Load distortion shader (initialized by default with Oculus Rift CV1 parameters)
vrConfig.distortionShader.id = LoadShaderProgram(vDistortionShaderStr, fDistortionShaderStr);
if (vrConfig.distortionShader.id != 0) LoadDefaultShaderLocations(&vrConfig.distortionShader);
if ((hmdDevice == HMD_DEFAULT_DEVICE) ||
(hmdDevice == HMD_OCULUS_RIFT_DK2) ||
(hmdDevice == HMD_OCULUS_RIFT_CV1))
{
// NOTE: Oculus Rift DK2 parameters
hmd.hResolution = 1280; // HMD horizontal resolution in pixels
hmd.vResolution = 800; // HMD vertical resolution in pixels
hmd.hScreenSize = 0.14976f;; // HMD horizontal size in meters
hmd.vScreenSize = 0.09356f; // HMD vertical size in meters
hmd.vScreenCenter = 0.04675f; // HMD screen center in meters
hmd.eyeToScreenDistance = 0.041f; // HMD distance between eye and display in meters
hmd.lensSeparationDistance = 0.0635f; // HMD lens separation distance in meters
hmd.interpupillaryDistance = 0.064f; // HMD IPD (distance between pupils) in meters
hmd.distortionK[0] = 1.0f; // HMD lens distortion constant parameter 0
hmd.distortionK[1] = 0.22f; // HMD lens distortion constant parameter 1
hmd.distortionK[2] = 0.24f; // HMD lens distortion constant parameter 2
hmd.distortionK[3] = 0.0f; // HMD lens distortion constant parameter 3
hmd.chromaAbCorrection[0] = 0.996f; // HMD chromatic aberration correction parameter 0
hmd.chromaAbCorrection[1] = -0.004f; // HMD chromatic aberration correction parameter 1
hmd.chromaAbCorrection[2] = 1.014f; // HMD chromatic aberration correction parameter 2
hmd.chromaAbCorrection[3] = 0.0f; // HMD chromatic aberration correction parameter 3
}
SetStereoConfig(hmd);
vrSimulator = true;
@ -3761,9 +3785,8 @@ static Color *GenNextMipmap(Color *srcData, int srcWidth, int srcHeight)
static void SetStereoConfig(VrDeviceInfo hmd)
{
// Compute aspect ratio
//float aspect = ((float)hmd.hResolution*0.5f)/(float)hmd.vResolution;
float aspect = (float)screenWidth*0.5f/(float)screenHeight;
float aspect = ((float)hmd.hResolution*0.5f)/(float)hmd.vResolution;
// Compute lens parameters
float lensShift = (hmd.hScreenSize*0.25f - hmd.lensSeparationDistance*0.5f)/hmd.hScreenSize;
float leftLensCenter[2] = { 0.25 + lensShift, 0.5f };
@ -3779,12 +3802,19 @@ static void SetStereoConfig(VrDeviceInfo hmd)
hmd.distortionK[1]*lensRadiusSq +
hmd.distortionK[2]*lensRadiusSq*lensRadiusSq +
hmd.distortionK[3]*lensRadiusSq*lensRadiusSq*lensRadiusSq;
TraceLog(DEBUG, "VR: Distortion Scale: %f", distortionScale);
float normScreenWidth = 0.5f;
float normScreenHeight = 1.0f;
float scaleIn[2] = { 2/normScreenWidth, 2/normScreenHeight/aspect };
float scale[2] = { normScreenWidth*0.5/distortionScale, normScreenHeight*0.5*aspect/distortionScale };
TraceLog(DEBUG, "VR: Distortion Shader: LeftLensCenter = { %f, %f }", leftLensCenter[0], leftLensCenter[1]);
TraceLog(DEBUG, "VR: Distortion Shader: RightLensCenter = { %f, %f }", rightLensCenter[0], rightLensCenter[1]);
TraceLog(DEBUG, "VR: Distortion Shader: Scale = { %f, %f }", scale[0], scale[1]);
TraceLog(DEBUG, "VR: Distortion Shader: ScaleIn = { %f, %f }", scaleIn[0], scaleIn[1]);
// Update distortion shader with lens and distortion-scale parameters
SetShaderValue(vrConfig.distortionShader, GetShaderLocation(vrConfig.distortionShader, "leftLensCenter"), leftLensCenter, 2);
SetShaderValue(vrConfig.distortionShader, GetShaderLocation(vrConfig.distortionShader, "rightLensCenter"), rightLensCenter, 2);
@ -3798,8 +3828,9 @@ static void SetStereoConfig(VrDeviceInfo hmd)
// Fovy is normally computed with: 2*atan2(hmd.vScreenSize, 2*hmd.eyeToScreenDistance)*RAD2DEG
// ...but with lens distortion it is increased (see Oculus SDK Documentation)
float fovy = 2.0f*atan2(hmd.vScreenSize*0.5f*distortionScale, hmd.eyeToScreenDistance)*RAD2DEG; // Really need distortionScale?
//float fovy = 2.0f*atan2(hmd.vScreenSize*0.5f*distortionScale, hmd.eyeToScreenDistance)*RAD2DEG; // Really need distortionScale?
float fovy = 2.0f*atan2(hmd.vScreenSize*0.5f, hmd.eyeToScreenDistance)*RAD2DEG;
// Compute camera projection matrices
float projOffset = 4.0f*lensShift; // Scaled to projection space coordinates [-1..1]
Matrix proj = MatrixPerspective(fovy, aspect, 0.01, 1000.0);
@ -3820,9 +3851,6 @@ static void SetStereoConfig(VrDeviceInfo hmd)
// Compute eyes Viewports
//vrConfig.eyesViewport[0] = (Rectangle){ 0, 0, hmd.hResolution/2, hmd.vResolution };
//vrConfig.eyesViewport[1] = (Rectangle){ hmd.hResolution/2, 0, hmd.hResolution/2, hmd.vResolution };
//https://forums.oculus.com/vip/discussion/3413/calculating-the-distortion-shader-parameters
//https://vrwiki.wikispaces.com/Theory+%26+practice
}
// Set internal projection and modelview matrix depending on eyes tracking data

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