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Fixed correct inverse projection matrix when computing from Zeye

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This commit is contained in:
Olivier Prat 2018-03-29 18:05:43 -04:00
parent bd0e13463d
commit 6f7a1eaefa
1 changed files with 9 additions and 8 deletions
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17
libraries/render-utils/src/DeferredTransform.slh
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@ -122,16 +122,12 @@ float evalZeyeFromZdb(float depth) {
return frameTransform._depthInfo.x / (depth * frameTransform._depthInfo.y + frameTransform._depthInfo.z); return frameTransform._depthInfo.x / (depth * frameTransform._depthInfo.y + frameTransform._depthInfo.z);
} }
vec3 evalEyeNormal(vec3 C) { float evalZdbFromZeye(float Zeye) {
return normalize(cross(dFdx(C), dFdy(C))); return (frameTransform._depthInfo.x - Zeye * frameTransform._depthInfo.z) / (Zeye * frameTransform._depthInfo.y);
} }
vec3 evalEyePositionFromZeye(int side, float Zeye, vec2 texcoord) { vec3 evalEyeNormal(vec3 C) {
// compute the view space position using the depth return normalize(cross(dFdx(C), dFdy(C)));
// basically manually pick the proj matrix components to do the inverse
float Xe = (-Zeye * (texcoord.x * 2.0 - 1.0) - Zeye * frameTransform._projection[side][2][0] - frameTransform._projection[side][3][0]) / frameTransform._projection[side][0][0];
float Ye = (-Zeye * (texcoord.y * 2.0 - 1.0) - Zeye * frameTransform._projection[side][2][1] - frameTransform._projection[side][3][1]) / frameTransform._projection[side][1][1];
return vec3(Xe, Ye, Zeye);
} }
vec3 evalEyePositionFromZdb(int side, float Zdb, vec2 texcoord) { vec3 evalEyePositionFromZdb(int side, float Zdb, vec2 texcoord) {
@ -142,6 +138,11 @@ vec3 evalEyePositionFromZdb(int side, float Zdb, vec2 texcoord) {
return eyePos.xyz / eyePos.w; return eyePos.xyz / eyePos.w;
} }
vec3 evalEyePositionFromZeye(int side, float Zeye, vec2 texcoord) {
float Zdb = evalZdbFromZeye(Zeye);
return evalEyePositionFromZdb(side, Zdb, texcoord);
}
ivec2 getPixelPosTexcoordPosAndSide(in vec2 glFragCoord, out ivec2 pixelPos, out vec2 texcoordPos, out ivec4 stereoSide) { ivec2 getPixelPosTexcoordPosAndSide(in vec2 glFragCoord, out ivec2 pixelPos, out vec2 texcoordPos, out ivec4 stereoSide) {
ivec2 fragPos = ivec2(glFragCoord.xy); ivec2 fragPos = ivec2(glFragCoord.xy);