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Improve blending code when no st-objs are visible

This commit is contained in:
David Guillen Fandos 2023-07-30 21:26:19 +02:00
parent 4349668315
commit 82cb11990f
1 changed files with 11 additions and 8 deletions
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19
video.cc
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@ -1181,7 +1181,7 @@ typedef enum
// Bit 9 is set if the pixel belongs to a 1st target layer
// Bit 10 is set if the pixel belongs to a 2nd target layer
// Bit 11 is set if the pixel belongs to a ST-object
template <blendtype bldtype>
template <blendtype bldtype, bool st_objs>
static void merge_blend(u32 start, u32 end, u16 *dst, u32 *src) {
u32 bldalpha = read_ioreg(REG_BLDALPHA);
u32 brightf = MIN(16, read_ioreg(REG_BLDY) & 0x1F);
@ -1197,9 +1197,9 @@ static void merge_blend(u32 start, u32 end, u16 *dst, u32 *src) {
// If ST-OBJ, force blending mode (has priority over other effects).
// If regular blending mode, blend if 1st/2nd bits are set respectively.
// Otherwise, apply other color effects if 1st bit is set.
bool do_blend = (pixpair & 0x04000200) == 0x04000200;
bool force_blend = (pixpair & 0x04000800) == 0x04000800;
if (force_blend || (do_blend && bldtype == BLEND_ONLY)) {
bool do_blend = (pixpair & 0x04000200) == 0x04000200;
if ((st_objs && force_blend) || (do_blend && bldtype == BLEND_ONLY)) {
// Top pixel is 1st target, pixel below is 2nd target. Blend!
u16 p1 = palette_ram_converted[(pixpair >> 0) & 0x1FF];
u16 p2 = palette_ram_converted[(pixpair >> 16) & 0x1FF];
@ -1238,7 +1238,7 @@ static void merge_blend(u32 start, u32 end, u16 *dst, u32 *src) {
u32 pixpair = src[start];
bool do_blend = (pixpair & 0x04000200) == 0x04000200;
bool force_blend = (pixpair & 0x04000800) == 0x04000800;
if (force_blend || (do_blend && bldtype == BLEND_ONLY)) {
if ((st_objs && force_blend) || (do_blend && bldtype == BLEND_ONLY)) {
// Top pixel is 1st target, pixel below is 2nd target. Blend!
u16 p1 = palette_ram_converted[(pixpair >> 0) & 0x1FF];
u16 p2 = palette_ram_converted[(pixpair >> 16) & 0x1FF];
@ -1395,7 +1395,7 @@ static void render_color_no_effect(
if (obj_blend) {
u32 screen_buffer[240];
render_layers<INDXCOLOR, STCKCOLOR, u32>(start, end, screen_buffer, enable_flags);
merge_blend<OBJ_BLEND>(start, end, scanline, screen_buffer);
merge_blend<OBJ_BLEND, true>(start, end, scanline, screen_buffer);
} else {
render_layers<FULLCOLOR, FULLCOLOR, u16>(start, end, scanline, enable_flags);
}
@ -1429,7 +1429,7 @@ static void render_color_effect(
if (obj_blend) {
u32 screen_buffer[240];
render_layers<INDXCOLOR, STCKCOLOR, u32>(start, end, screen_buffer, enable_flags);
merge_blend<BLEND_BRIGHT>(start, end, scanline, screen_buffer);
merge_blend<BLEND_BRIGHT, true>(start, end, scanline, screen_buffer);
} else {
render_layers<INDXCOLOR, INDXCOLOR, u16>(start, end, scanline, enable_flags);
merge_brightness<BLEND_BRIGHT>(start, end, scanline);
@ -1449,7 +1449,7 @@ static void render_color_effect(
if (obj_blend) {
u32 screen_buffer[240];
render_layers<INDXCOLOR, STCKCOLOR, u32>(start, end, screen_buffer, enable_flags);
merge_blend<BLEND_DARK>(start, end, scanline, screen_buffer);
merge_blend<BLEND_DARK, true>(start, end, scanline, screen_buffer);
} else {
render_layers<INDXCOLOR, INDXCOLOR, u16>(start, end, scanline, enable_flags);
merge_brightness<BLEND_DARK>(start, end, scanline);
@ -1469,7 +1469,10 @@ static void render_color_effect(
if (some_1st_tgt && some_2nd_tgt && non_trns_tgt) {
u32 screen_buffer[240];
render_layers<STCKCOLOR, STCKCOLOR, u32>(start, end, screen_buffer, enable_flags);
merge_blend<BLEND_ONLY>(start, end, scanline, screen_buffer);
if (obj_blend)
merge_blend<BLEND_ONLY, true>(start, end, scanline, screen_buffer);
else
merge_blend<BLEND_ONLY, false>(start, end, scanline, screen_buffer);
return;
}
}