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OpenGL: clipping support for HWR_DrawStretchyFixedPatch

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This commit is contained in:
James R 2022-12-11 17:44:49 -08:00
parent 09c55858b7
commit db062fd0bb
1 changed files with 48 additions and 8 deletions
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56
src/hardware/hw_draw.c
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@ -145,6 +145,11 @@ void HWR_DrawStretchyFixedPatch(patch_t *gpatch, fixed_t x, fixed_t y, fixed_t p
// 0--1
float dupx, dupy, fscalew, fscaleh, fwidth, fheight;
const cliprect_t *clip = V_GetClipRect();
float s_min, s_max;
float t_min, t_max;
// make patch ready in hardware cache
if (!colormap)
HWR_GetPatch(gpatch);
@ -224,6 +229,41 @@ void HWR_DrawStretchyFixedPatch(patch_t *gpatch, fixed_t x, fixed_t y, fixed_t p
fheight = (float)(gpatch->height) * dupy;
}
s_min = t_min = 0.0f;
s_max = hwrPatch->max_s;
t_max = hwrPatch->max_t;
if (clip)
{
if (cx < clip->left)
{
s_min = ((clip->left - cx) / fwidth) * s_max;
cx = clip->left;
}
if (cy < clip->top)
{
t_min = ((clip->top - cy) / fheight) * t_max;
cy = clip->top;
}
if ((cx + fwidth) > clip->right)
{
const float n = (clip->right - clip->left);
s_max = (s_min + ((n / fwidth) * s_max));
fwidth = n;
}
if ((cy + fheight) > clip->bottom)
{
const float n = (clip->bottom - clip->top);
t_max = (t_min + ((n / fheight) * t_max));
fheight = n;
}
}
// positions of the cx, cy, are between 0 and vid.width/vid.height now, we need them to be between -1 and 1
cx = -1 + (cx / (vid.width/2));
cy = 1 - (cy / (vid.height/2));
@ -243,24 +283,24 @@ void HWR_DrawStretchyFixedPatch(patch_t *gpatch, fixed_t x, fixed_t y, fixed_t p
if (option & V_FLIP)
{
v[0].s = v[3].s = hwrPatch->max_s;
v[2].s = v[1].s = 0.0f;
v[0].s = v[3].s = s_max;
v[2].s = v[1].s = s_min;
}
else
{
v[0].s = v[3].s = 0.0f;
v[2].s = v[1].s = hwrPatch->max_s;
v[0].s = v[3].s = s_min;
v[2].s = v[1].s = s_max;
}
if (option & V_VFLIP)
{
v[0].t = v[1].t = hwrPatch->max_t;
v[2].t = v[3].t = 0.0f;
v[0].t = v[1].t = t_max;
v[2].t = v[3].t = t_min;
}
else
{
v[0].t = v[1].t = 0.0f;
v[2].t = v[3].t = hwrPatch->max_t;
v[0].t = v[1].t = t_min;
v[2].t = v[3].t = t_max;
}
flags = PF_NoDepthTest;