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gen: render priority improved somewhat... still some issues

This commit is contained in:
beirich 2012-08-24 02:30:20 +00:00
parent 575ceb3966
commit 9545475455
1 changed files with 18 additions and 8 deletions
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26
BizHawk.Emulation/Consoles/Sega/Genesis/GenVDP.Render.cs
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@ -4,6 +4,14 @@ namespace BizHawk.Emulation.Consoles.Sega
{ {
public partial class GenVDP public partial class GenVDP
{ {
// Priority buffer contents have the following values:
// 0 = Backdrop color
// 1 = Plane B Low Priority
// 2 = Plane A Low Priority
// 4 = Plane B High Priority
// 5 = Plane A High Priority
// 9 = Sprite has been drawn
byte[] PriorityBuffer = new byte[320]; byte[] PriorityBuffer = new byte[320];
// TODO, should provide startup register values. // TODO, should provide startup register values.
@ -21,8 +29,8 @@ namespace BizHawk.Emulation.Consoles.Sega
RenderSpritesScanline(); RenderSpritesScanline();
} }
if (ScanLine == 223) // shrug //if (ScanLine == 223) // shrug
RenderPalette(); //RenderPalette();
} }
void RenderPalette() void RenderPalette()
@ -100,6 +108,9 @@ namespace BizHawk.Emulation.Consoles.Sega
goto nextSprite; goto nextSprite;
if (sprite.X + sprite.WidthPixels <= 0) if (sprite.X + sprite.WidthPixels <= 0)
goto nextSprite; goto nextSprite;
if (sprite.X == -128)
throw new Exception("bleeeh"); // masking code is not really tested
//break; // TODO this satisfies masking mode 1 but not masking mode 2
if (sprite.HeightCells == 2) if (sprite.HeightCells == 2)
sprite.HeightCells = 2; sprite.HeightCells = 2;
@ -117,14 +128,14 @@ namespace BizHawk.Emulation.Consoles.Sega
if (sprite.X + xi < 0 || sprite.X + xi >= FrameWidth) if (sprite.X + xi < 0 || sprite.X + xi >= FrameWidth)
continue; continue;
if (sprite.Priority && PriorityBuffer[sprite.X + xi] >= 6) continue; if (sprite.Priority == false && PriorityBuffer[sprite.X + xi] >= 3) continue;
if (PriorityBuffer[sprite.X + xi] >= 3) continue; if (PriorityBuffer[sprite.X + xi] == 9) continue;
int pixel = PatternBuffer[((pattern + ((xi / 8) * sprite.HeightCells)) * 64) + ((yline & 7) * 8) + (xi & 7)]; int pixel = PatternBuffer[((pattern + ((xi / 8) * sprite.HeightCells)) * 64) + ((yline & 7) * 8) + (xi & 7)];
if (pixel != 0) if (pixel != 0)
{ {
FrameBuffer[scanLineBase + sprite.X + xi] = Palette[paletteBase + pixel]; FrameBuffer[scanLineBase + sprite.X + xi] = Palette[paletteBase + pixel];
PriorityBuffer[sprite.X + xi] = sprite.Priority ? (byte) 6 : (byte) 3; PriorityBuffer[sprite.X + xi] = 9;
} }
} }
} else { // HFlip } else { // HFlip
@ -135,14 +146,13 @@ namespace BizHawk.Emulation.Consoles.Sega
if (sprite.X + xi < 0 || sprite.X + xi >= FrameWidth) if (sprite.X + xi < 0 || sprite.X + xi >= FrameWidth)
continue; continue;
if (sprite.Priority && PriorityBuffer[sprite.X + xi] >= 6) continue; if (sprite.Priority == false && PriorityBuffer[sprite.X + xi] >= 3) continue;
if (PriorityBuffer[sprite.X + xi] >= 3) continue;
int pixel = PatternBuffer[((pattern + ((-xi / 8) * sprite.HeightCells)) * 64) + ((yline & 7) * 8) + (7 - (xi & 7))]; int pixel = PatternBuffer[((pattern + ((-xi / 8) * sprite.HeightCells)) * 64) + ((yline & 7) * 8) + (7 - (xi & 7))];
if (pixel != 0) if (pixel != 0)
{ {
FrameBuffer[scanLineBase + sprite.X + xi] = Palette[paletteBase + pixel]; FrameBuffer[scanLineBase + sprite.X + xi] = Palette[paletteBase + pixel];
PriorityBuffer[sprite.X + xi] = sprite.Priority ? (byte) 6 : (byte) 3; PriorityBuffer[sprite.X + xi] = 9;
} }
} }
} }