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Added some comments to Init()

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This commit is contained in:
csBlueChip 2009-09-02 15:34:46 +00:00
parent 3d12a4f77e
commit 10a1148791
1 changed files with 24 additions and 16 deletions
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40
GRRLIB/GRRLIB/GRRLIB_core.c
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@ -51,45 +51,54 @@ int GRRLIB_Init (void) {
// Ensure this function is only ever called once
if (is_setup) return 0 ;
// Initialise the video subsystem
VIDEO_Init();
// Grab a pointer to the video mode attributes
if ( !(rmode = VIDEO_GetPreferredMode(NULL)) ) return -1 ;
// Video Mode Correction
switch (rmode->viTVMode) {
case VI_DEBUG_PAL: // PAL 50hz 576i
//rmode = &TVPal574IntDfScale;
rmode = &TVPal528IntDf; //BC
rmode = &TVPal528IntDf; //! BC ...this is still wrong, but "less bad" for now
break;
}
// 16:9 and 4:3 Screen Adjustment
if (CONF_GetAspectRatio() == CONF_ASPECT_16_9) {
rmode->viWidth = 678;
rmode->viXOrigin = (VI_MAX_WIDTH_NTSC - 678)/2;
rmode->viXOrigin = (VI_MAX_WIDTH_NTSC - 678)/2; //! This probably needs to consider PAL
} else { // 4:3
rmode->viWidth = 672;
rmode->viXOrigin = (VI_MAX_WIDTH_NTSC - 672)/2;
}
// --
VIDEO_Configure(rmode);
// Get some memory to use for a "double buffered" frame buffer
if ( !(xfb[0] = MEM_K0_TO_K1(SYS_AllocateFramebuffer(rmode))) ) return -1 ;
if ( !(xfb[1] = MEM_K0_TO_K1(SYS_AllocateFramebuffer(rmode))) ) return -1 ;
VIDEO_SetNextFramebuffer(xfb[fb]);
VIDEO_SetBlack(true);
VIDEO_Flush();
VIDEO_WaitVSync();
VIDEO_SetNextFramebuffer(xfb[fb]); // Choose a frame buffer to start with
VIDEO_SetBlack(true); // and paint it black
VIDEO_Flush(); // flush the frame to the TV
VIDEO_WaitVSync(); // Wait for the TV to finish updating
// If the TV image is interlaced it takes two passes to display the image
if (rmode->viTVMode & VI_NON_INTERLACE) VIDEO_WaitVSync() ;
// The FIFO is the buffer the CPU uses to send commands to the GPU
if ( !(gp_fifo = memalign(32, DEFAULT_FIFO_SIZE)) ) return -1 ;
memset(gp_fifo, 0, DEFAULT_FIFO_SIZE);
GX_Init(gp_fifo, DEFAULT_FIFO_SIZE);
// Clears the BG to color and clears the z-buffer
// Clear the background to opaque black and clears the z-buffer
GX_SetCopyClear((GXColor){ 0, 0, 0, 0xff }, GX_MAX_Z24);
// Other GX setup
yscale = GX_GetYScaleFactor(rmode->efbHeight, rmode->xfbHeight);
yscale = GX_GetYScaleFactor(rmode->efbHeight, rmode->xfbHeight);
xfbHeight = GX_SetDispCopyYScale(yscale);
GX_SetDispCopySrc(0, 0, rmode->fbWidth, rmode->efbHeight);
GX_SetDispCopyDst(rmode->fbWidth, xfbHeight);
@ -102,22 +111,23 @@ int GRRLIB_Init (void) {
GX_SetDispCopyGamma(GX_GM_1_0);
// Setup the vertex descriptor
// Tells the flipper to expect direct data
GX_ClearVtxDesc();
GX_InvVtxCache();
GX_InvalidateTexAll();
GX_ClearVtxDesc(); // clear all the vertex descriptors
GX_InvVtxCache(); // Invalidate the vertex cache
GX_InvalidateTexAll(); // Invalidate all textures
// Tells the flipper to expect direct data
GX_SetVtxDesc(GX_VA_TEX0, GX_NONE);
GX_SetVtxDesc(GX_VA_POS, GX_DIRECT);
GX_SetVtxDesc(GX_VA_CLR0, GX_DIRECT);
GX_SetVtxAttrFmt(GX_VTXFMT0, GX_VA_POS, GX_POS_XYZ, GX_F32, 0);
GX_SetVtxAttrFmt(GX_VTXFMT0, GX_VA_TEX0, GX_TEX_ST, GX_F32, 0);
// Colour 0 is 8bit RGBA format
GX_SetVtxAttrFmt(GX_VTXFMT0, GX_VA_CLR0, GX_CLR_RGBA, GX_RGBA8, 0);
GX_SetZMode(GX_FALSE, GX_LEQUAL, GX_TRUE);
GX_SetNumChans(1);
GX_SetNumTexGens(1);
GX_SetNumChans(1); // colour is the same as vertex colour
GX_SetNumTexGens(1); // One texture exists
GX_SetTevOp(GX_TEVSTAGE0, GX_PASSCLR);
GX_SetTevOrder(GX_TEVSTAGE0, GX_TEXCOORD0, GX_TEXMAP0, GX_COLOR0A0);
GX_SetTexCoordGen(GX_TEXCOORD0, GX_TG_MTX2x4, GX_TG_TEX0, GX_IDENTITY);
@ -137,8 +147,6 @@ int GRRLIB_Init (void) {
GX_SetCullMode(GX_CULL_NONE);
GRRLIB_ClipReset();
VIDEO_SetBlack(false);
// Default settings
GRRLIB_Settings.antialias = true;
GRRLIB_Settings.blend = GRRLIB_BLEND_ALPHA;