diff options
Diffstat (limited to 'src/code/PreRender.c')
| -rw-r--r-- | src/code/PreRender.c | 18 |
1 files changed, 13 insertions, 5 deletions
diff --git a/src/code/PreRender.c b/src/code/PreRender.c index ddf6b473e..d240f6c80 100644 --- a/src/code/PreRender.c +++ b/src/code/PreRender.c @@ -431,7 +431,8 @@ void PreRender_RestoreZBuffer(PreRender* this, Gfx** gfxP) { /** * Draws a full-screen image to the current framebuffer, that sources the rgb channel from `this->fbufSave` and - * the alpha channel from `this->cvgSave` modulated by environment color. + * the alpha channel from `this->cvgSave` modulated by environment color. The alpha channel becomes the framebuffer's + * coverage content. */ void func_800C213C(PreRender* this, Gfx** gfxP) { Gfx* gfx; @@ -450,6 +451,7 @@ void func_800C213C(PreRender* this, Gfx** gfxP) { gDPSetEnvColor(gfx++, 255, 255, 255, 32); // Effectively disable blending in both cycles. It's 2-cycle so that TEXEL1 can be used to point to a different // texture tile. + // CVG_X_ALPHA in this mode transfers combined alpha to coverage. gDPSetOtherMode(gfx++, G_AD_DISABLE | G_CD_DISABLE | G_CK_NONE | G_TC_FILT | G_TF_POINT | G_TT_NONE | G_TL_TILE | G_TD_CLAMP | G_TP_NONE | G_CYC_2CYCLE | G_PM_NPRIMITIVE, @@ -460,7 +462,12 @@ void func_800C213C(PreRender* this, Gfx** gfxP) { // Set up the color combiner: first cycle: TEXEL0, TEXEL1 + ENVIRONMENT; second cycle: G_CC_PASS2 gDPSetCombineLERP(gfx++, 0, 0, 0, TEXEL0, 1, 0, TEXEL1, ENVIRONMENT, 0, 0, 0, COMBINED, 0, 0, 0, COMBINED); - nRows = 4; + // The first 0xA00 bytes of TMEM are reserved for framebuffer data (TEXEL0, RGBA16) + // The last 0x500 bytes of the remaining 0x600 bytes of TMEM is for coverage data (TEXEL1, I8) + // In total it needs to simultaneously fit + // SCREEN_WIDTH * (RGBA16 pixel + I8 pixel) = SCREEN_WIDTH * (2 bytes + 1 byte) +#define FB_ROWS (TMEM_SIZE / (3 * SCREEN_WIDTH)) + nRows = FB_ROWS; rowsRemaining = this->height; curRow = 0; @@ -486,9 +493,9 @@ void func_800C213C(PreRender* this, Gfx** gfxP) { rtile = rtile; // Fake match? // Load the coverage line - gDPLoadMultiTile(gfx++, this->cvgSave, 0x0160, rtile, G_IM_FMT_I, G_IM_SIZ_8b, this->width, this->height, - uls, ult, lrs, lrt, 0, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, - G_TX_NOMASK, G_TX_NOLOD, G_TX_NOLOD); + gDPLoadMultiTile(gfx++, this->cvgSave, (TMEM_SIZE - SCREEN_WIDTH * FB_ROWS) / 8, rtile, G_IM_FMT_I, + G_IM_SIZ_8b, this->width, this->height, uls, ult, lrs, lrt, 0, G_TX_NOMIRROR | G_TX_WRAP, + G_TX_NOMIRROR | G_TX_WRAP, G_TX_NOMASK, G_TX_NOMASK, G_TX_NOLOD, G_TX_NOLOD); rtile = rtile; // Fake match? @@ -500,6 +507,7 @@ void func_800C213C(PreRender* this, Gfx** gfxP) { curRow += nRows; rowsRemaining -= nRows; } +#undef FB_ROWS gDPPipeSync(gfx++); *gfxP = gfx; |