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gl: Treat PF_Masked as lower priority than other modes

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Eidolon 2024-04-09 13:41:32 -05:00
parent 38274046a9
commit 3c881597c9
1 changed files with 67 additions and 48 deletions
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115
src/hardware/r_opengl/r_opengl.c
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@ -1673,41 +1673,59 @@ static void SetBlendEquation(GLenum mode)
static void SetBlendMode(FBITFIELD flags)
{
// It is unfortunately valid for flags like PF_Fog, PF_Occluded and PF_Masked to come in in addition to
// the exclusive blend types like PF_Additive. So we have to treat them as a special case.
// PF_Masked in particular often comes joined with PF_Additive, with Additive needing to take priority.
// Set blending function
switch (flags)
if (flags & PF_Fog)
{
case PF_Translucent & PF_Blending:
pglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // alpha = level of transparency
break;
case PF_Masked & PF_Blending:
// Hurdler: does that mean lighting is only made by alpha src?
// it sounds ok, but not for polygonsmooth
pglBlendFunc(GL_SRC_ALPHA, GL_ZERO); // 0 alpha = holes in texture
break;
case PF_Additive & PF_Blending:
case PF_Subtractive & PF_Blending:
case PF_ReverseSubtract & PF_Blending:
pglBlendFunc(GL_SRC_ALPHA, GL_ONE); // src * alpha + dest
break;
case PF_Environment & PF_Blending:
pglBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
break;
case PF_Multiplicative & PF_Blending:
pglBlendFunc(GL_DST_COLOR, GL_ZERO);
break;
case PF_Fog & PF_Fog:
// Sryder: Fog
// multiplies input colour by input alpha, and destination colour by input colour, then adds them
pglBlendFunc(GL_SRC_ALPHA, GL_SRC_COLOR);
break;
default: // must be 0, otherwise it's an error
// No blending
pglBlendFunc(GL_ONE, GL_ZERO); // the same as no blending
break;
// Sryder: Fog
// multiplies input colour by input alpha, and destination colour by input colour, then adds them
pglBlendFunc(GL_SRC_ALPHA, GL_SRC_COLOR);
}
else
{
boolean blending = true;
switch (flags & (PF_Blending & ~(PF_Masked | PF_Occlude)))
{
case PF_Translucent:
pglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); // alpha = level of transparency
break;
case PF_Additive:
case PF_Subtractive:
case PF_ReverseSubtract:
pglBlendFunc(GL_SRC_ALPHA, GL_ONE); // src * alpha + dest
break;
case PF_Environment:
pglBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
break;
case PF_Multiplicative:
pglBlendFunc(GL_DST_COLOR, GL_ZERO);
break;
default:
blending = false;
break;
}
if (!blending)
{
if (flags & PF_Masked)
{
// Hurdler: does that mean lighting is only made by alpha src?
// it sounds ok, but not for polygonsmooth
pglBlendFunc(GL_SRC_ALPHA, GL_ZERO); // 0 alpha = holes in texture
}
else
{
// No blending
pglBlendFunc(GL_ONE, GL_ZERO); // the same as no blending
}
}
}
// Set blending equation
switch (flags)
switch (flags & (PF_Blending & ~(PF_Masked | PF_Occlude)))
{
case PF_Subtractive & PF_Blending:
SetBlendEquation(GL_FUNC_SUBTRACT);
@ -1723,25 +1741,26 @@ static void SetBlendMode(FBITFIELD flags)
}
// Alpha test
switch (flags)
if (flags & PF_Fog)
{
case PF_Masked & PF_Blending:
pglAlphaFunc(GL_GREATER, 0.5f);
break;
case PF_Translucent & PF_Blending:
case PF_Additive & PF_Blending:
case PF_Subtractive & PF_Blending:
case PF_ReverseSubtract & PF_Blending:
case PF_Environment & PF_Blending:
case PF_Multiplicative & PF_Blending:
pglAlphaFunc(GL_NOTEQUAL, 0.0f);
break;
case PF_Fog & PF_Fog:
pglAlphaFunc(GL_ALWAYS, 0.0f); // Don't discard zero alpha fragments
break;
default:
pglAlphaFunc(GL_GREATER, 0.5f);
break;
pglAlphaFunc(GL_ALWAYS, 0.0f); // Don't discard zero alpha fragments
}
else
{
switch (flags & (PF_Blending & ~(PF_Masked | PF_Occlude)))
{
case PF_Translucent:
case PF_Additive:
case PF_Subtractive:
case PF_ReverseSubtract:
case PF_Environment:
case PF_Multiplicative:
pglAlphaFunc(GL_NOTEQUAL, 0.0f);
break;
default:
pglAlphaFunc(GL_GREATER, 0.5f);
break;
}
}
}