mirror of
https://github.com/dborth/vbagx.git
synced 2024-11-01 16:35:11 +01:00
452 lines
11 KiB
C++
452 lines
11 KiB
C++
/*
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Mode 2 is a 256 colour tiled graphics mode which supports scaling and rotation.
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There is no background layer 0 or 1 in this mode. Only background layers 2 and 3.
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There are 256 tiles available.
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It does not support flipping.
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These routines only render a single line at a time, because of the way the GBA does events.
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*/
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#include "GBA.h"
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#include "Globals.h"
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#include "GBAGfx.h"
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void mode2RenderLine()
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{
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u16 *palette = (u16 *)paletteRAM;
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if(DISPCNT & 0x80) {
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for(int x = 0; x < 240; x++) {
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lineMix[x] = 0x7fff;
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}
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gfxLastVCOUNT = VCOUNT;
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return;
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}
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if(layerEnable & 0x0400) {
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int changed = gfxBG2Changed;
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if(gfxLastVCOUNT > VCOUNT)
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changed = 3;
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gfxDrawRotScreen(BG2CNT, BG2X_L, BG2X_H, BG2Y_L, BG2Y_H,
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BG2PA, BG2PB, BG2PC, BG2PD, gfxBG2X, gfxBG2Y,
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changed, line2);
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}
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if(layerEnable & 0x0800) {
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int changed = gfxBG3Changed;
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if(gfxLastVCOUNT > VCOUNT)
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changed = 3;
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gfxDrawRotScreen(BG3CNT, BG3X_L, BG3X_H, BG3Y_L, BG3Y_H,
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BG3PA, BG3PB, BG3PC, BG3PD, gfxBG3X, gfxBG3Y,
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changed, line3);
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}
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gfxDrawSprites(lineOBJ);
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u32 backdrop;
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if(customBackdropColor == -1) {
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backdrop = (READ16LE(&palette[0]) | 0x30000000);
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} else {
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backdrop = ((customBackdropColor & 0x7FFF) | 0x30000000);
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}
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for(int x = 0; x < 240; x++) {
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u32 color = backdrop;
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u8 top = 0x20;
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if((u8)(line2[x]>>24) < (u8)(color >> 24)) {
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color = line2[x];
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top = 0x04;
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}
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if((u8)(line3[x]>>24) < (u8)(color >> 24)) {
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color = line3[x];
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top = 0x08;
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}
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if((u8)(lineOBJ[x]>>24) < (u8)(color >> 24)) {
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color = lineOBJ[x];
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top = 0x10;
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}
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if((top & 0x10) && (color & 0x00010000)) {
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// semi-transparent OBJ
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u32 back = backdrop;
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u8 top2 = 0x20;
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if((u8)(line2[x]>>24) < (u8)(back >> 24)) {
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back = line2[x];
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top2 = 0x04;
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}
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if((u8)(line3[x]>>24) < (u8)(back >> 24)) {
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back = line3[x];
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top2 = 0x08;
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}
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if(top2 & (BLDMOD>>8))
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color = gfxAlphaBlend(color, back,
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coeff[COLEV & 0x1F],
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coeff[(COLEV >> 8) & 0x1F]);
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else {
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switch((BLDMOD >> 6) & 3) {
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case 2:
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if(BLDMOD & top)
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color = gfxIncreaseBrightness(color, coeff[COLY & 0x1F]);
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break;
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case 3:
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if(BLDMOD & top)
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color = gfxDecreaseBrightness(color, coeff[COLY & 0x1F]);
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break;
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}
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}
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}
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lineMix[x] = color;
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}
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gfxBG2Changed = 0;
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gfxBG3Changed = 0;
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gfxLastVCOUNT = VCOUNT;
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}
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void mode2RenderLineNoWindow()
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{
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u16 *palette = (u16 *)paletteRAM;
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if(DISPCNT & 0x80) {
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for(int x = 0; x < 240; x++) {
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lineMix[x] = 0x7fff;
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}
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gfxLastVCOUNT = VCOUNT;
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return;
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}
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if(layerEnable & 0x0400) {
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int changed = gfxBG2Changed;
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if(gfxLastVCOUNT > VCOUNT)
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changed = 3;
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gfxDrawRotScreen(BG2CNT, BG2X_L, BG2X_H, BG2Y_L, BG2Y_H,
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BG2PA, BG2PB, BG2PC, BG2PD, gfxBG2X, gfxBG2Y,
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changed, line2);
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}
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if(layerEnable & 0x0800) {
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int changed = gfxBG3Changed;
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if(gfxLastVCOUNT > VCOUNT)
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changed = 3;
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gfxDrawRotScreen(BG3CNT, BG3X_L, BG3X_H, BG3Y_L, BG3Y_H,
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BG3PA, BG3PB, BG3PC, BG3PD, gfxBG3X, gfxBG3Y,
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changed, line3);
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}
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gfxDrawSprites(lineOBJ);
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u32 backdrop;
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if(customBackdropColor == -1) {
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backdrop = (READ16LE(&palette[0]) | 0x30000000);
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} else {
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backdrop = ((customBackdropColor & 0x7FFF) | 0x30000000);
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}
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for(int x = 0; x < 240; x++) {
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u32 color = backdrop;
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u8 top = 0x20;
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if((u8)(line2[x]>>24) < (u8)(color >> 24)) {
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color = line2[x];
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top = 0x04;
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}
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if((u8)(line3[x]>>24) < (u8)(color >> 24)) {
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color = line3[x];
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top = 0x08;
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}
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if((u8)(lineOBJ[x]>>24) < (u8)(color >> 24)) {
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color = lineOBJ[x];
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top = 0x10;
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}
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if(!(color & 0x00010000)) {
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switch((BLDMOD >> 6) & 3) {
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case 0:
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break;
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case 1:
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{
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if(top & BLDMOD) {
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u32 back = backdrop;
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u8 top2 = 0x20;
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if((u8)(line2[x]>>24) < (u8)(back >> 24)) {
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if(top != 0x04) {
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back = line2[x];
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top2 = 0x04;
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}
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}
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if((u8)(line3[x]>>24) < (u8)(back >> 24)) {
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if(top != 0x08) {
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back = line3[x];
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top2 = 0x08;
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}
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}
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if((u8)(lineOBJ[x]>>24) < (u8)(back >> 24)) {
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if(top != 0x10) {
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back = lineOBJ[x];
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top2 = 0x10;
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}
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}
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if(top2 & (BLDMOD>>8))
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color = gfxAlphaBlend(color, back,
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coeff[COLEV & 0x1F],
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coeff[(COLEV >> 8) & 0x1F]);
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}
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}
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break;
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case 2:
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if(BLDMOD & top)
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color = gfxIncreaseBrightness(color, coeff[COLY & 0x1F]);
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break;
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case 3:
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if(BLDMOD & top)
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color = gfxDecreaseBrightness(color, coeff[COLY & 0x1F]);
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break;
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}
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} else {
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// semi-transparent OBJ
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u32 back = backdrop;
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u8 top2 = 0x20;
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if((u8)(line2[x]>>24) < (u8)(back >> 24)) {
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back = line2[x];
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top2 = 0x04;
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}
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if((u8)(line3[x]>>24) < (u8)(back >> 24)) {
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back = line3[x];
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top2 = 0x08;
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}
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if(top2 & (BLDMOD>>8))
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color = gfxAlphaBlend(color, back,
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coeff[COLEV & 0x1F],
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coeff[(COLEV >> 8) & 0x1F]);
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else {
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switch((BLDMOD >> 6) & 3) {
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case 2:
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if(BLDMOD & top)
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color = gfxIncreaseBrightness(color, coeff[COLY & 0x1F]);
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break;
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case 3:
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if(BLDMOD & top)
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color = gfxDecreaseBrightness(color, coeff[COLY & 0x1F]);
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break;
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}
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}
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}
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lineMix[x] = color;
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}
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gfxBG2Changed = 0;
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gfxBG3Changed = 0;
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gfxLastVCOUNT = VCOUNT;
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}
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void mode2RenderLineAll()
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{
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u16 *palette = (u16 *)paletteRAM;
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if(DISPCNT & 0x80) {
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for(int x = 0; x < 240; x++) {
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lineMix[x] = 0x7fff;
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}
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gfxLastVCOUNT = VCOUNT;
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return;
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}
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bool inWindow0 = false;
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bool inWindow1 = false;
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if(layerEnable & 0x2000) {
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u8 v0 = WIN0V >> 8;
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u8 v1 = WIN0V & 255;
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inWindow0 = ((v0 == v1) && (v0 >= 0xe8));
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if(v1 >= v0)
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inWindow0 |= (VCOUNT >= v0 && VCOUNT < v1);
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else
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inWindow0 |= (VCOUNT >= v0 || VCOUNT < v1);
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}
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if(layerEnable & 0x4000) {
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u8 v0 = WIN1V >> 8;
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u8 v1 = WIN1V & 255;
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inWindow1 = ((v0 == v1) && (v0 >= 0xe8));
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if(v1 >= v0)
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inWindow1 |= (VCOUNT >= v0 && VCOUNT < v1);
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else
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inWindow1 |= (VCOUNT >= v0 || VCOUNT < v1);
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}
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if(layerEnable & 0x0400) {
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int changed = gfxBG2Changed;
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if(gfxLastVCOUNT > VCOUNT)
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changed = 3;
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gfxDrawRotScreen(BG2CNT, BG2X_L, BG2X_H, BG2Y_L, BG2Y_H,
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BG2PA, BG2PB, BG2PC, BG2PD, gfxBG2X, gfxBG2Y,
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changed, line2);
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}
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if(layerEnable & 0x0800) {
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int changed = gfxBG3Changed;
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if(gfxLastVCOUNT > VCOUNT)
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changed = 3;
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gfxDrawRotScreen(BG3CNT, BG3X_L, BG3X_H, BG3Y_L, BG3Y_H,
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BG3PA, BG3PB, BG3PC, BG3PD, gfxBG3X, gfxBG3Y,
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changed, line3);
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}
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gfxDrawSprites(lineOBJ);
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gfxDrawOBJWin(lineOBJWin);
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u32 backdrop;
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if(customBackdropColor == -1) {
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backdrop = (READ16LE(&palette[0]) | 0x30000000);
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} else {
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backdrop = ((customBackdropColor & 0x7FFF) | 0x30000000);
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}
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u8 inWin0Mask = WININ & 0xFF;
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u8 inWin1Mask = WININ >> 8;
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u8 outMask = WINOUT & 0xFF;
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for(int x = 0; x < 240; x++) {
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u32 color = backdrop;
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u8 top = 0x20;
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u8 mask = outMask;
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if(!(lineOBJWin[x] & 0x80000000)) {
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mask = WINOUT >> 8;
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}
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if(inWindow1) {
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if(gfxInWin1[x])
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mask = inWin1Mask;
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}
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if(inWindow0) {
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if(gfxInWin0[x]) {
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mask = inWin0Mask;
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}
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}
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if(line2[x] < color && (mask & 4)) {
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color = line2[x];
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top = 0x04;
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}
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if((u8)(line3[x]>>24) < (u8)(color >> 24) && (mask & 8)) {
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color = line3[x];
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top = 0x08;
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}
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if((u8)(lineOBJ[x]>>24) < (u8)(color >> 24) && (mask & 16)) {
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color = lineOBJ[x];
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top = 0x10;
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}
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if(color & 0x00010000) {
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// semi-transparent OBJ
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u32 back = backdrop;
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u8 top2 = 0x20;
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if((mask & 4) && line2[x] < back) {
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back = line2[x];
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top2 = 0x04;
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}
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if((mask & 8) && (u8)(line3[x]>>24) < (u8)(back >> 24)) {
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back = line3[x];
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top2 = 0x08;
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}
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if(top2 & (BLDMOD>>8))
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color = gfxAlphaBlend(color, back,
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coeff[COLEV & 0x1F],
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coeff[(COLEV >> 8) & 0x1F]);
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else {
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switch((BLDMOD >> 6) & 3) {
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case 2:
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if(BLDMOD & top)
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color = gfxIncreaseBrightness(color, coeff[COLY & 0x1F]);
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break;
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case 3:
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if(BLDMOD & top)
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color = gfxDecreaseBrightness(color, coeff[COLY & 0x1F]);
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break;
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}
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}
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} else if(mask & 32) {
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// special FX on the window
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switch((BLDMOD >> 6) & 3) {
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case 0:
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break;
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case 1:
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{
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if(top & BLDMOD) {
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u32 back = backdrop;
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u8 top2 = 0x20;
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if((mask & 4) && line2[x] < back) {
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if(top != 0x04) {
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back = line2[x];
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top2 = 0x04;
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}
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}
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if((mask & 8) && (u8)(line3[x]>>24) < (u8)(back >> 24)) {
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if(top != 0x08) {
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back = line3[x];
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top2 = 0x08;
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}
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}
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if((mask & 16) && (u8)(lineOBJ[x]>>24) < (u8)(back >> 24)) {
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if(top != 0x10) {
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back = lineOBJ[x];
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top2 = 0x10;
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}
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}
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if(top2 & (BLDMOD>>8))
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color = gfxAlphaBlend(color, back,
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coeff[COLEV & 0x1F],
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coeff[(COLEV >> 8) & 0x1F]);
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}
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}
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break;
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case 2:
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if(BLDMOD & top)
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color = gfxIncreaseBrightness(color, coeff[COLY & 0x1F]);
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break;
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case 3:
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if(BLDMOD & top)
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color = gfxDecreaseBrightness(color, coeff[COLY & 0x1F]);
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break;
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}
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}
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lineMix[x] = color;
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}
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gfxBG2Changed = 0;
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gfxBG3Changed = 0;
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gfxLastVCOUNT = VCOUNT;
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}
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