OrdinaryMagician/vkdoom_m
OrdinaryMagician/vkdoom_m
1
Fork 0
Code Activity

Add linear filtering to column drawers and fix offsetting bug with wall/span linear filters

Browse source
This commit is contained in:
Magnus Norddahl 2016-11-05 11:29:50 +01:00
commit 4b18530047
15 changed files with 309 additions and 94 deletions
Download patch file Download diff file Expand all files Collapse all files

125
src/r_things.cpp
View file

@ -251,8 +251,133 @@ double sprtopscreen;
bool sprflipvert;
void R_DrawMaskedColumnBgra(FTexture *tex, fixed_t col, bool useRt, bool unmasked)
{
fixed_t saved_iscale = dc_iscale; // Save this because we need to modify it for mipmaps
// Normalize to 0-1 range:
double uv_stepd = FIXED2DBL(dc_iscale);
double v_step = uv_stepd / tex->GetHeight();
// Convert to uint32:
dc_iscale = (uint32_t)(v_step * (1 << 30));
// Texture mipmap and filter selection:
fixed_t xoffset = col;
double magnitude = fabs(uv_stepd * 2);
bool magnifying = magnitude < 1.0f;
int mipmap_offset = 0;
int mip_width = tex->GetWidth();
int mip_height = tex->GetHeight();
if (r_mipmap && tex->Mipmapped() && mip_width > 1 && mip_height > 1)
{
uint32_t xpos = (uint32_t)((((uint64_t)xoffset) << FRACBITS) / mip_width);
double texture_bias = 1.7f;
double level = MAX(magnitude - 3.0, 0.0);
while (level > texture_bias && mip_width > 1 && mip_height > 1)
{
mipmap_offset += mip_width * mip_height;
level *= 0.5f;
mip_width = MAX(mip_width >> 1, 1);
mip_height = MAX(mip_height >> 1, 1);
}
xoffset = (xpos >> FRACBITS) * mip_width;
}
const uint32_t *pixels = tex->GetPixelsBgra() + mipmap_offset;
bool filter_nearest = (magnifying && !r_magfilter) || (!magnifying && !r_minfilter);
if (filter_nearest)
{
xoffset = MAX(MIN(xoffset, (mip_width << FRACBITS) - 1), 0);
int tx = xoffset >> FRACBITS;
dc_source = (BYTE*)(pixels + tx * mip_height);
dc_source2 = nullptr;
dc_textureheight = mip_height;
dc_texturefracx = 0;
}
else
{
xoffset = MAX(MIN(xoffset - (FRACUNIT / 2), (mip_width << FRACBITS) - 1), 0);
int tx0 = xoffset >> FRACBITS;
int tx1 = MIN(tx0 + 1, mip_width - 1);
dc_source = (BYTE*)(pixels + tx0 * mip_height);
dc_source2 = (BYTE*)(pixels + tx1 * mip_height);
dc_textureheight = mip_height;
dc_texturefracx = (xoffset >> (FRACBITS - 4)) & 15;
}
// Grab the posts we need to draw
const FTexture::Span *span;
tex->GetColumnBgra(col >> FRACBITS, &span);
FTexture::Span unmaskedSpan[2];
if (unmasked)
{
span = unmaskedSpan;
unmaskedSpan[0].TopOffset = 0;
unmaskedSpan[0].Length = tex->GetHeight();
unmaskedSpan[1].TopOffset = 0;
unmaskedSpan[1].Length = 0;
}
// Draw each span post
while (span->Length != 0)
{
const int length = span->Length;
const int top = span->TopOffset;
// calculate unclipped screen coordinates for post
dc_yl = (int)(sprtopscreen + spryscale * top + 0.5);
dc_yh = (int)(sprtopscreen + spryscale * (top + length) + 0.5) - 1;
if (sprflipvert)
{
swapvalues(dc_yl, dc_yh);
}
if (dc_yh >= mfloorclip[dc_x])
{
dc_yh = mfloorclip[dc_x] - 1;
}
if (dc_yl < mceilingclip[dc_x])
{
dc_yl = mceilingclip[dc_x];
}
if (dc_yl <= dc_yh)
{
dc_dest = (ylookup[dc_yl] + dc_x) * 4 + dc_destorg;
dc_count = dc_yh - dc_yl + 1;
double v = ((dc_yl + 0.5 - sprtopscreen) / spryscale) / tex->GetHeight();
dc_texturefrac = (uint32_t)(v * (1 << 30));
if (useRt)
hcolfunc_pre();
else
colfunc();
}
span++;
}
dc_iscale = saved_iscale;
if (sprflipvert && useRt)
rt_flip_posts();
}
void R_DrawMaskedColumn (FTexture *tex, fixed_t col, bool useRt, bool unmasked)
{
// Handle the linear filtered version in a different function to reduce chances of merge conflicts from zdoom.
if (r_swtruecolor && !drawer_needs_pal_input && !useRt) // To do: add support to R_DrawColumnHoriz_rgba
{
R_DrawMaskedColumnBgra(tex, col, useRt, unmasked);
return;
}
const FTexture::Span *span;
const BYTE *column;
if (r_swtruecolor && !drawer_needs_pal_input)