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Added alpha to blending table

This commit is contained in:
neauoire 2021-08-01 11:16:29 -07:00
parent 2d493c55bb
commit 6d8e06e879
1 changed files with 5 additions and 4 deletions
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9
src/devices/ppu.c
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@ -12,11 +12,12 @@ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE.
*/
static Uint8 blending[4][16] = {
static Uint8 blending[5][16] = {
{0, 0, 0, 0, 1, 0, 1, 1, 2, 2, 0, 2, 3, 3, 3, 0},
{0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3},
{1, 2, 3, 1, 1, 2, 3, 1, 1, 2, 3, 1, 1, 2, 3, 1},
{2, 3, 1, 2, 2, 3, 1, 2, 2, 3, 1, 2, 2, 3, 1, 2}};
{2, 3, 1, 2, 2, 3, 1, 2, 2, 3, 1, 2, 2, 3, 1, 2},
{1, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0, 1, 1, 1, 1, 0}};
void
clear(Ppu *p)
@ -41,7 +42,7 @@ puticn(Ppu *p, Uint8 layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint
for(v = 0; v < 8; v++)
for(h = 0; h < 8; h++) {
Uint8 ch1 = (sprite[v] >> (7 - h)) & 0x1;
if(ch1 || (color != 0x05 && color != 0x0a && color != 0x0f))
if(ch1 || blending[4][color])
putpixel(p,
layer,
x + (flipx ? 7 - h : h),
@ -59,7 +60,7 @@ putchr(Ppu *p, Uint8 layer, Uint16 x, Uint16 y, Uint8 *sprite, Uint8 color, Uint
Uint8 ch1 = ((sprite[v] >> (7 - h)) & 0x1);
Uint8 ch2 = ((sprite[v + 8] >> (7 - h)) & 0x1);
Uint8 ch = ch1 + ch2 * 2;
if(ch || (color != 0x05 && color != 0x0a && color != 0x0f))
if(ch || blending[4][color])
putpixel(p,
layer,
x + (flipx ? 7 - h : h),