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18-bit graphics pipeline

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(final buffer is 32-bit)
This commit is contained in:
StapleButter
2017-02-14 21:55:51 +01:00
parent c5b7ec2168
commit ef7fbf8b03
6 changed files with 91 additions and 49 deletions
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94
GPU2D.cpp
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@ -82,11 +82,8 @@ void GPU2D::Reset()
memset(BGRotD, 0, 2*2);
}
void GPU2D::SetFramebuffer(u16* buf)
void GPU2D::SetFramebuffer(u32* buf)
{
// framebuffer is 256x192 16bit.
// might eventually support other framebuffer types/sizes
// TODO: change this. the DS uses 18bit color
Framebuffer = buf;
}
@ -205,7 +202,7 @@ void GPU2D::Write32(u32 addr, u32 val)
void GPU2D::DrawScanline(u32 line)
{
u16* dst = &Framebuffer[256*line];
u32* dst = &Framebuffer[256*line];
u32 dispmode = DispCnt >> 16;
dispmode &= (Num ? 0x1 : 0x3);
@ -214,8 +211,8 @@ void GPU2D::DrawScanline(u32 line)
{
case 0: // screen off
{
for (int i = 0; i < 256>>1; i++)
((u32*)dst)[i] = 0x7FFF7FFF;
for (int i = 0; i < 256; i++)
dst[i] = 0xFF3F3F3F;
}
break;
@ -230,8 +227,15 @@ void GPU2D::DrawScanline(u32 line)
u32* vram = (u32*)GPU::VRAM[(DispCnt >> 18) & 0x3];
vram = &vram[line << 7];
for (int i = 0; i < 256>>1; i++)
((u32*)dst)[i] = vram[i];
for (int i = 0; i < 256; i++)
{
u16 color = vram[i];
u8 r = (color & 0x001F) << 1;
u8 g = (color & 0x03E0) >> 4;
u8 b = (color & 0x7C00) >> 9;
dst[i] = r | (g << 8) | (b << 16);
}
}
break;
@ -241,6 +245,12 @@ void GPU2D::DrawScanline(u32 line)
}
break;
}
// convert to 32-bit RGBA
for (int i = 0; i < 256; i++)
dst[i] = ((dst[i] & 0x003F3F3F) << 2) |
((dst[i] & 0x00303030) >> 4) |
0xFF000000;
}
void GPU2D::VBlank()
@ -250,7 +260,7 @@ void GPU2D::VBlank()
template<u32 bgmode>
void GPU2D::DrawScanlineBGMode(u32 line, u32* spritebuf, u16* dst)
void GPU2D::DrawScanlineBGMode(u32 line, u32* spritebuf, u32* dst)
{
for (int i = 3; i >= 0; i--)
{
@ -300,17 +310,24 @@ void GPU2D::DrawScanlineBGMode(u32 line, u32* spritebuf, u16* dst)
}
}
void GPU2D::DrawScanline_Mode1(u32 line, u16* dst)
void GPU2D::DrawScanline_Mode1(u32 line, u32* dst)
{
u32 backdrop;
if (Num) backdrop = *(u16*)&GPU::Palette[0x400];
else backdrop = *(u16*)&GPU::Palette[0];
// TODO: color effect for backdrop
{
u8 r = (backdrop & 0x001F) << 1;
u8 g = (backdrop & 0x03E0) >> 4;
u8 b = (backdrop & 0x7C00) >> 9;
backdrop |= (backdrop<<16);
for (int i = 0; i < 256>>1; i++)
((u32*)dst)[i] = backdrop;
// TODO: color effect for backdrop
backdrop = r | (g << 8) | (b << 16) | 0x20000000;
for (int i = 0; i < 256; i++)
dst[i] = backdrop;
}
// prerender sprites
u32 spritebuf[256];
@ -333,26 +350,38 @@ void GPU2D::DrawScanline_Mode1(u32 line, u16* dst)
}
void GPU2D::DrawBG_3D(u32 line, u16* dst)
typedef void (*DrawPixelFunc)(u32 bgnum, u32* dst, u16 color, u32 blendfunc);
void GPU2D::DrawPixel_Normal(u32 bgnum, u32* dst, u16 color, u32 blendfunc)
{
u8 r = (color & 0x001F) << 1;
u8 g = (color & 0x03E0) >> 4;
u8 b = (color & 0x7C00) >> 9;
*dst = r | (g << 8) | (b << 16) | (0x01000000 << bgnum);
}
void GPU2D::DrawBG_3D(u32 line, u32* dst)
{
// TODO: scroll, etc
u8* src = GPU3D::GetLine(line);
for (int i = 0; i < 256; i++)
{
// TODO: color buffer should be 18bit!!
u8 r = *src++;
u8 g = *src++;
u8 b = *src++;
u8 a = *src++;
if (a == 0) continue;
dst[i] = (r >> 1) | ((g >> 1) << 5) | ((b >> 1) << 10);
// TODO: blending
// alpha is 6bit too....?
dst[i] = r | (g << 8) | (b << 16);
}
}
void GPU2D::DrawBG_Text(u32 line, u16* dst, u32 bgnum)
void GPU2D::DrawBG_Text(u32 line, u32* dst, u32 bgnum)
{
u16 bgcnt = BGCnt[bgnum];
@ -366,6 +395,8 @@ void GPU2D::DrawBG_Text(u32 line, u16* dst, u32 bgnum)
u32 widexmask = (bgcnt & 0x4000) ? 0x100 : 0;
DrawPixelFunc drawpixelfn = DrawPixel_Normal;
extpal = (bgcnt & 0x0080) && (DispCnt & 0x40000000);
if (Num)
@ -456,7 +487,7 @@ void GPU2D::DrawBG_Text(u32 line, u16* dst, u32 bgnum)
color = pixels[tilexoff];
if (color)
dst[i] = curpal[color];
drawpixelfn(bgnum, &dst[i], curpal[color], BlendFunc);
xoff++;
}
@ -499,14 +530,14 @@ void GPU2D::DrawBG_Text(u32 line, u16* dst, u32 bgnum)
}
if (color)
dst[i] = curpal[color];
drawpixelfn(bgnum, &dst[i], curpal[color], BlendFunc);
xoff++;
}
}
}
void GPU2D::DrawBG_Extended(u32 line, u16* dst, u32 bgnum)
void GPU2D::DrawBG_Extended(u32 line, u32* dst, u32 bgnum)
{
u16 bgcnt = BGCnt[bgnum];
@ -529,6 +560,8 @@ void GPU2D::DrawBG_Extended(u32 line, u16* dst, u32 bgnum)
if (bgcnt & 0x2000) overflowmask = 0;
else overflowmask = ~(coordmask | 0x7FF);
DrawPixelFunc drawpixelfn = DrawPixel_Normal;
extpal = (DispCnt & 0x40000000);
s16 rotA = BGRotA[bgnum-2];
@ -566,7 +599,7 @@ void GPU2D::DrawBG_Extended(u32 line, u16* dst, u32 bgnum)
u16 color = bitmap[(((rotY & coordmask) >> 8) << yshift) + ((rotX & coordmask) >> 8)];
if (color & 0x8000)
dst[i] = color;
drawpixelfn(bgnum, &dst[i], color, BlendFunc);
}
rotX += rotA;
@ -587,7 +620,7 @@ void GPU2D::DrawBG_Extended(u32 line, u16* dst, u32 bgnum)
u8 color = tileset[(((rotY & coordmask) >> 8) << yshift) + ((rotX & coordmask) >> 8)];
if (color)
dst[i] = pal[color];
drawpixelfn(bgnum, &dst[i], pal[color], BlendFunc);
}
rotX += rotA;
@ -660,7 +693,7 @@ void GPU2D::DrawBG_Extended(u32 line, u16* dst, u32 bgnum)
color = pixels[(tileyoff << 3) + tilexoff];
if (color)
dst[i] = curpal[color];
drawpixelfn(bgnum, &dst[i], curpal[color], BlendFunc);
}
rotX += rotA;
@ -672,12 +705,17 @@ void GPU2D::DrawBG_Extended(u32 line, u16* dst, u32 bgnum)
//BGYCenter[bgnum-2] += rotD;
}
void GPU2D::InterleaveSprites(u32* buf, u32 prio, u16* dst)
void GPU2D::InterleaveSprites(u32* buf, u32 prio, u32* dst)
{
DrawPixelFunc drawpixelfn = DrawPixel_Normal;
for (u32 i = 0; i < 256; i++)
{
if ((buf[i] & 0xF8000) == prio)
dst[i] = buf[i] & 0x7FFF;
{
u32 blendfunc = 0;
drawpixelfn(4, &dst[i], buf[i], blendfunc);
}
}
}