OrdinaryMagician/vkdoom_m
OrdinaryMagician/vkdoom_m
1
Fork 0
Code Activity

- implement blend functions

Browse source
This commit is contained in:
Magnus Norddahl 2019-08-05 08:37:22 +02:00
commit b17351cda4
2 changed files with 84 additions and 78 deletions
Download patch file Download diff file Expand all files Collapse all files

93
src/rendering/polyrenderer/drawers/screen_triangle.cpp
View file

@ -74,25 +74,100 @@ static void WriteVaryings(int y, int x0, int x1, const TriDrawTriangleArgs* args
WriteVarying(args->v1->worldZ * args->v1->w + args->gradientX.WorldZ * startX + args->gradientY.WorldZ * startY, args->gradientX.WorldZ, x0, x1, thread->scanline.W, thread->scanline.WorldZ);
}
static void WriteBlend(int y, int x0, int x1, PolyTriangleThreadData* thread)
static uint32_t BlendColor(FRenderStyle style, uint32_t fg, uint32_t bg)
{
static const int shiftTable[] = {
0, 0, 0, 0, // STYLEALPHA_Zero
0, 0, 0, 0, // STYLEALPHA_One
24, 24, 24, 24, // STYLEALPHA_Src
24, 24, 24, 24, // STYLEALPHA_InvSrc
24, 16, 8, 0, // STYLEALPHA_SrcCol
24, 16, 8, 0, // STYLEALPHA_InvSrcCol
24, 16, 8, 0, // STYLEALPHA_DstCol
24, 16, 8, 0 // STYLEALPHA_InvDstCol
};
bool invsrc = style.SrcAlpha & 1;
bool invdst = style.DestAlpha & 1;
int srcinput = style.SrcAlpha <= STYLEALPHA_One ? 0 : (style.SrcAlpha >= STYLEALPHA_DstCol ? bg : fg);
int dstinput = style.DestAlpha <= STYLEALPHA_One ? 0 : (style.DestAlpha >= STYLEALPHA_DstCol ? bg : fg);
const int* shiftsrc = shiftTable + (style.SrcAlpha << 2);
const int* shiftdst = shiftTable + (style.DestAlpha << 2);
int32_t src[4], dst[4];
for (int i = 0; i < 4; i++)
{
// Grab component for scale factors
src[i] = (srcinput >> shiftsrc[i]) & 0xff;
dst[i] = (dstinput >> shiftdst[i]) & 0xff;
// Inverse if needed
src[i] = invsrc ? 0xff - src[i] : src[i];
dst[i] = invdst ? 0xff - dst[i] : dst[i];
// Rescale 0-255 to 0-256
src[i] = src[i] + (src[i] >> 7);
dst[i] = dst[i] + (dst[i] >> 7);
// Multiply with input
src[i] = src[i] * ((fg >> (24 - (i << 3))) & 0xff);
dst[i] = dst[i] * ((bg >> (24 - (i << 3))) & 0xff);
}
uint32_t out[4];
switch (style.BlendOp)
{
default:
case STYLEOP_Add: for (int i = 0; i < 4; i++) out[i] = clamp((src[i] + dst[i] + 127) >> 8, 0, 255); break;
case STYLEOP_Sub: for (int i = 0; i < 4; i++) out[i] = clamp((src[i] - dst[i] + 127) >> 8, 0, 255); break;
case STYLEOP_RevSub: for (int i = 0; i < 4; i++) out[i] = clamp((dst[i] - src[i] + 127) >> 8, 0, 255); break;
}
return MAKEARGB(out[0], out[1], out[2], out[3]);
}
static void WriteColor(int y, int x0, int x1, PolyTriangleThreadData* thread)
{
uint32_t* dest = (uint32_t*)thread->dest;
uint32_t* line = dest + y * (ptrdiff_t)thread->dest_pitch;
FRenderStyle style = thread->RenderStyle;
uint32_t* fragcolor = thread->scanline.FragColor;
if (!thread->AlphaTest)
if (style.BlendOp == STYLEOP_Add && style.SrcAlpha == STYLEALPHA_One && style.DestAlpha == STYLEALPHA_Zero)
{
for (int x = x0; x < x1; x++)
if (!thread->AlphaTest)
{
line[x] = thread->scanline.FragColor[x];
for (int x = x0; x < x1; x++)
{
line[x] = fragcolor[x];
}
}
else
{
for (int x = x0; x < x1; x++)
{
if (fragcolor[x] > 0x7f000000)
line[x] = fragcolor[x];
}
}
}
else
{
uint32_t* fragcolor = thread->scanline.FragColor;
for (int x = x0; x < x1; x++)
if (!thread->AlphaTest)
{
if (fragcolor[x] > 0x7f000000)
line[x] = thread->scanline.FragColor[x];
for (int x = x0; x < x1; x++)
{
line[x] = BlendColor(style, fragcolor[x], line[x]);
}
}
else
{
for (int x = x0; x < x1; x++)
{
if (fragcolor[x] > 0x7f000000)
line[x] = BlendColor(style, fragcolor[x], line[x]);
}
}
}
}
@ -173,7 +248,7 @@ static void DrawSpan(int y, int x0, int x1, const TriDrawTriangleArgs* args, Pol
RunShader(x0, x1, thread);
if (thread->drawargs.WriteColor())
WriteBlend(y, x0, x1, thread);
WriteColor(y, x0, x1, thread);
if (thread->drawargs.WriteDepth())
WriteDepth(y, x0, x1, thread);
if (thread->drawargs.WriteStencil())