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Fix sign extension from BG references (broke it in 7f7d06)

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David Guillen Fandos 2021-08-24 17:13:39 +02:00
parent 1e976fb312
commit 40b3cd51ec
1 changed files with 14 additions and 8 deletions
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22
video.c
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@ -2336,17 +2336,23 @@ static void render_scanline_text_transparent_alpha(u32 layer,
s32 affine_reference_x[2]; s32 affine_reference_x[2];
s32 affine_reference_y[2]; s32 affine_reference_y[2];
static inline s32 signext28(u32 value)
{
s32 ret = (s32)(value << 4);
return ret >> 4;
}
void video_reload_counters() void video_reload_counters()
{ {
/* This happens every Vblank */ /* This happens every Vblank */
affine_reference_x[0] = (s32)(read_ioreg(REG_BG2X_L) | affine_reference_x[0] = signext28(read_ioreg(REG_BG2X_L) |
((read_ioreg(REG_BG2X_H) & 0xFFF) << 16)); (read_ioreg(REG_BG2X_H) << 16));
affine_reference_y[0] = (s32)(read_ioreg(REG_BG2Y_L) | affine_reference_y[0] = signext28(read_ioreg(REG_BG2Y_L) |
((read_ioreg(REG_BG2Y_H) & 0xFFF) << 16)); (read_ioreg(REG_BG2Y_H) << 16));
affine_reference_x[1] = (s32)(read_ioreg(REG_BG3X_L) | affine_reference_x[1] = signext28(read_ioreg(REG_BG3X_L) |
((read_ioreg(REG_BG3X_H) & 0xFFF) << 16)); (read_ioreg(REG_BG3X_H) << 16));
affine_reference_y[1] = (s32)(read_ioreg(REG_BG3Y_L) | affine_reference_y[1] = signext28(read_ioreg(REG_BG3Y_L) |
((read_ioreg(REG_BG3Y_H) & 0xFFF) << 16)); (read_ioreg(REG_BG3Y_H) << 16));
} }
#define affine_render_bg_pixel_normal() \ #define affine_render_bg_pixel_normal() \