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Modulate row interleaved stereo 3d offset with window height parity, because gl_FragCoord.y approaches zero at the bottom, not the top of the window.

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This commit is contained in:
Christopher Bruns 2016-10-02 13:49:57 -04:00
parent 576619504e
commit 0240cdef18
2 changed files with 8 additions and 4 deletions
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5
src/gl/stereo3d/gl_interleaved3d.cpp
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@ -99,7 +99,10 @@ void RowInterleaved3D::Present() const
GLRenderer->mScreenViewport.width / (float)GLRenderer->mBuffers->GetWidth(),
GLRenderer->mScreenViewport.height / (float)GLRenderer->mBuffers->GetHeight());
GLRenderer->mPresent3dRowShader->VerticalPixelOffset.Set(0); // fixme: vary with window location
GLRenderer->mPresent3dRowShader->VerticalPixelOffset.Set(
0 // fixme: vary with window location
+ box.height % 2 // because we want the top pixel offset, but gl_FragCoord.y is the bottom pixel offset
);
GLRenderer->RenderScreenQuad();
}

7
wadsrc/static/shaders/glsl/present_row3d.fp
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@ -7,7 +7,6 @@ uniform sampler2D RightEyeTexture;
uniform float InvGamma;
uniform float Contrast;
uniform float Brightness;
uniform int WindowHeight;
uniform int VerticalPixelOffset; // top-of-window might not be top-of-screen
vec4 ApplyGamma(vec4 c)
@ -20,8 +19,10 @@ vec4 ApplyGamma(vec4 c)
void main()
{
int thisVerticalPixel = int(gl_FragCoord.y);
bool isLeftEye = (thisVerticalPixel + VerticalPixelOffset) % 2 == 0;
int thisVerticalPixel = int(gl_FragCoord.y + 1.0); // Bottom row is typically the right eye, when WindowHeight is even
bool isLeftEye = (thisVerticalPixel // because we want to alternate eye view on each row
+ VerticalPixelOffset // because the window might not be aligned to the screen
) % 2 == 0;
vec4 inputColor;
if (isLeftEye) {
inputColor = texture(LeftEyeTexture, TexCoord);