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Make r_showDepth work

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before it displayed the float values from the depth buffers as
byte-wise RGBA values, which looked weird and wasn't super helpful..

now it's displayed as luminance float (i.e. one float representing
greyscale), and transformed in the same way the TDM particle shader
transforms the depth values to doom units (and then scaled back to
0..1, with 1 representing 3000 units)
This commit is contained in:
Daniel Gibson 2024-06-16 18:01:27 +02:00
parent 69e121727d
commit 5ff59547a4
1 changed files with 18 additions and 9 deletions
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27
neo/renderer/tr_rendertools.cpp
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@ -463,16 +463,25 @@ void RB_ShowDepthBuffer( void ) {
qglReadPixels( 0, 0, glConfig.vidWidth, glConfig.vidHeight, GL_DEPTH_COMPONENT , GL_FLOAT, depthReadback );
#if 0
for ( i = 0 ; i < glConfig.vidWidth * glConfig.vidHeight ; i++ ) {
((byte *)depthReadback)[i*4] =
((byte *)depthReadback)[i*4+1] =
((byte *)depthReadback)[i*4+2] = 255 * ((float *)depthReadback)[i];
((byte *)depthReadback)[i*4+3] = 1;
}
#endif
qglDrawPixels( glConfig.vidWidth, glConfig.vidHeight, GL_RGBA , GL_UNSIGNED_BYTE, depthReadback );
for ( int i = 0 ; i < glConfig.vidWidth * glConfig.vidHeight ; i++ ) {
float& px = ((float *)depthReadback)[i];
float d = px;
// the following calculation is based on how the TDM soft particle shader translates the depth value to doom units
// 0.9995 is practically infinite distance, clamping to 0.9994 clamps to max 30k doom units,
// which is more than enough (and prevents a potential division by 0 below)
d = (d < 0.9994f) ? d : 0.9994f;
d = d - 0.9995f; // d is now negative, between -0.0001 and -0.9995
d = 1.0f / d;
// d *= -3.0f; // this would translate d to distance in doom units, doing it together with the next step
d *= (-3.0f / 3000.0f); // now 3000 units is 1.0, i.e. completely white (=> more details for closer distances)
px = d;
}
qglDrawPixels( glConfig.vidWidth, glConfig.vidHeight, GL_LUMINANCE, GL_FLOAT, depthReadback );
R_StaticFree( depthReadback );
}