mirror of https://github.com/bsnes-emu/bsnes.git
71 lines
2.3 KiB
C++
71 lines
2.3 KiB
C++
#ifdef PPU_CPP
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//screen: 0 = main, 1 = sub
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void PPU::build_window_table(uint8 bg, bool screen) {
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bool set = 1, clr = 0;
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uint8* table = (screen == 0 ? window[bg].main : window[bg].sub);
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if(bg != COL) {
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if(screen == 0 && regs.window_enabled[bg] == false) {
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memset(table, 0, 256);
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return;
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}
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if(screen == 1 && regs.sub_window_enabled[bg] == false) {
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memset(table, 0, 256);
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return;
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}
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} else {
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switch(screen == 0 ? regs.color_mask : regs.colorsub_mask) {
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case 0: memset(table, 1, 256); return; //always
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case 3: memset(table, 0, 256); return; //never
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case 1: set = 1, clr = 0; break; //inside window only
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case 2: set = 0, clr = 1; break; //outside window only
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}
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}
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const uint16 window1_left = regs.window1_left;
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const uint16 window1_right = regs.window1_right;
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const uint16 window2_left = regs.window2_left;
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const uint16 window2_right = regs.window2_right;
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if(regs.window1_enabled[bg] == false && regs.window2_enabled[bg] == false) {
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memset(table, clr, 256);
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return;
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}
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if(regs.window1_enabled[bg] == true && regs.window2_enabled[bg] == false) {
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if(regs.window1_invert[bg] == true) set ^= clr ^= set ^= clr;
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for(unsigned x = 0; x < 256; x++) {
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table[x] = (x >= window1_left && x <= window1_right) ? set : clr;
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}
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return;
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}
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if(regs.window1_enabled[bg] == false && regs.window2_enabled[bg] == true) {
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if(regs.window2_invert[bg] == true) set ^= clr ^= set ^= clr;
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for(unsigned x = 0; x < 256; x++) {
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table[x] = (x >= window2_left && x <= window2_right) ? set : clr;
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}
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return;
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}
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for(unsigned x = 0; x < 256; x++) {
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bool w1_mask = (x >= window1_left && x <= window1_right) ^ regs.window1_invert[bg];
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bool w2_mask = (x >= window2_left && x <= window2_right) ^ regs.window2_invert[bg];
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switch(regs.window_mask[bg]) {
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case 0: table[x] = (w1_mask | w2_mask) == 1 ? set : clr; break; //or
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case 1: table[x] = (w1_mask & w2_mask) == 1 ? set : clr; break; //and
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case 2: table[x] = (w1_mask ^ w2_mask) == 1 ? set : clr; break; //xor
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case 3: table[x] = (w1_mask ^ w2_mask) == 0 ? set : clr; break; //xnor
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}
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}
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}
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void PPU::build_window_tables(uint8 bg) {
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build_window_table(bg, 0);
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build_window_table(bg, 1);
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}
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#endif
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