mirror of https://github.com/bsnes-emu/bsnes.git
95 lines
3.1 KiB
C++
95 lines
3.1 KiB
C++
auto PPU::renderForceBlank() -> void {
|
|
uint32* line = output + regs.vcounter * 240;
|
|
for(auto x : range(240)) line[x] = 0x7fff;
|
|
}
|
|
|
|
auto PPU::renderScreen() -> void {
|
|
uint32* line = output + regs.vcounter * 240;
|
|
|
|
if(regs.bg[0].control.mosaic) renderMosaicBackground(BG0);
|
|
if(regs.bg[1].control.mosaic) renderMosaicBackground(BG1);
|
|
if(regs.bg[2].control.mosaic) renderMosaicBackground(BG2);
|
|
if(regs.bg[3].control.mosaic) renderMosaicBackground(BG3);
|
|
renderMosaicObject();
|
|
|
|
for(auto x : range(240)) {
|
|
Registers::WindowFlags flags;
|
|
flags.enable[BG0] = true; //enable all layers if no windows are enabled
|
|
flags.enable[BG1] = true;
|
|
flags.enable[BG2] = true;
|
|
flags.enable[BG3] = true;
|
|
flags.enable[OBJ] = true;
|
|
flags.enable[SFX] = true;
|
|
|
|
//determine active window
|
|
if(regs.control.enablewindow[In0] || regs.control.enablewindow[In1] || regs.control.enablewindow[Obj]) {
|
|
flags = regs.windowflags[Out];
|
|
if(regs.control.enablewindow[Obj] && windowmask[Obj][x]) flags = regs.windowflags[Obj];
|
|
if(regs.control.enablewindow[In1] && windowmask[In1][x]) flags = regs.windowflags[In1];
|
|
if(regs.control.enablewindow[In0] && windowmask[In0][x]) flags = regs.windowflags[In0];
|
|
}
|
|
|
|
//priority sorting: find topmost two pixels
|
|
uint a = 5, b = 5;
|
|
for(int p = 3; p >= 0; p--) {
|
|
for(int l = 5; l >= 0; l--) {
|
|
if(layer[l][x].enable && layer[l][x].priority == p && flags.enable[l]) {
|
|
b = a;
|
|
a = l;
|
|
}
|
|
}
|
|
}
|
|
|
|
auto& above = layer[a];
|
|
auto& below = layer[b];
|
|
bool blendabove = regs.blend.control.above[a];
|
|
bool blendbelow = regs.blend.control.below[b];
|
|
uint color = above[x].color;
|
|
auto eva = min(16u, (uint)regs.blend.eva);
|
|
auto evb = min(16u, (uint)regs.blend.evb);
|
|
auto evy = min(16u, (uint)regs.blend.evy);
|
|
|
|
//perform blending, if needed
|
|
if(flags.enable[SFX] == false) {
|
|
} else if(above[x].translucent && blendbelow) {
|
|
color = blend(above[x].color, eva, below[x].color, evb);
|
|
} else if(regs.blend.control.mode == 1 && blendabove && blendbelow) {
|
|
color = blend(above[x].color, eva, below[x].color, evb);
|
|
} else if(regs.blend.control.mode == 2 && blendabove) {
|
|
color = blend(above[x].color, 16 - evy, 0x7fff, evy);
|
|
} else if(regs.blend.control.mode == 3 && blendabove) {
|
|
color = blend(above[x].color, 16 - evy, 0x0000, evy);
|
|
}
|
|
|
|
//output pixel
|
|
line[x] = color;
|
|
}
|
|
}
|
|
|
|
auto PPU::renderWindow(uint w) -> void {
|
|
uint y = regs.vcounter;
|
|
|
|
uint y1 = regs.window[w].y1, y2 = regs.window[w].y2;
|
|
uint x1 = regs.window[w].x1, x2 = regs.window[w].x2;
|
|
|
|
if(y2 < y1 || y2 > 160) y2 = 160;
|
|
if(x2 < x1 || x2 > 240) x2 = 240;
|
|
|
|
if(y >= y1 && y < y2) {
|
|
for(uint x = x1; x < x2; x++) {
|
|
windowmask[w][x] = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
auto PPU::blend(uint above, uint eva, uint below, uint evb) -> uint {
|
|
uint5 ar = above >> 0, ag = above >> 5, ab = above >> 10;
|
|
uint5 br = below >> 0, bg = below >> 5, bb = below >> 10;
|
|
|
|
uint r = (ar * eva + br * evb) >> 4;
|
|
uint g = (ag * eva + bg * evb) >> 4;
|
|
uint b = (ab * eva + bb * evb) >> 4;
|
|
|
|
return min(31, r) << 0 | min(31, g) << 5 | min(31, b) << 10;
|
|
}
|