ref: 3033fafd257e3dff9a8c6621076c6dc15849bafc
dir: /qw/d_init.c/
// d_init.c: rasterization driver initialization #include <u.h> #include <libc.h> #include <stdio.h> #include "quakedef.h" #define NUM_MIPS 4 cvar_t d_mipcap = {"d_mipcap", "0"}; cvar_t d_mipscale = {"d_mipscale", "1"}; surfcache_t *d_initial_rover; qboolean d_roverwrapped; int d_minmip; float d_scalemip[NUM_MIPS-1]; static float basemip[NUM_MIPS-1] = {1.0, 0.5*0.8, 0.25*0.8}; extern int d_aflatcolor; void (*d_drawspans) (espan_t *pspan); /* =============== D_Init =============== */ void D_Init (void) { r_skydirect = 1; Cvar_RegisterVariable (&d_mipcap); Cvar_RegisterVariable (&d_mipscale); r_drawpolys = false; r_worldpolysbacktofront = false; r_recursiveaffinetriangles = true; r_pixbytes = 1; r_aliasuvscale = 1.0; } /* =============== D_CopyRects =============== */ void D_CopyRects (vrect_t */*prects*/, int /*transparent*/) { // this function is only required if the CPU doesn't have direct access to the // back buffer, and there's some driver interface function that the driver // doesn't support and requires Quake to do in software (such as drawing the // console); Quake will then draw into wherever the driver points vid.buffer // and will call this function before swapping buffers } /* =============== D_EnableBackBufferAccess =============== */ void D_EnableBackBufferAccess (void) { VID_LockBuffer (); } /* =============== D_TurnZOn =============== */ void D_TurnZOn (void) { // not needed for software version } /* =============== D_DisableBackBufferAccess =============== */ void D_DisableBackBufferAccess (void) { VID_UnlockBuffer (); } /* =============== D_SetupFrame =============== */ void D_SetupFrame (void) { int i; if (r_dowarp) d_viewbuffer = r_warpbuffer; else d_viewbuffer = (void *)(byte *)vid.buffer; if (r_dowarp) screenwidth = WARP_WIDTH; else screenwidth = vid.rowbytes; d_roverwrapped = false; d_initial_rover = sc_rover; d_minmip = d_mipcap.value; if (d_minmip > 3) d_minmip = 3; else if (d_minmip < 0) d_minmip = 0; for (i=0 ; i<(NUM_MIPS-1) ; i++) d_scalemip[i] = basemip[i] * d_mipscale.value; d_drawspans = D_DrawSpans16; d_aflatcolor = 0; } /* =============== D_UpdateRects =============== */ void D_UpdateRects (vrect_t */*prect*/) { // the software driver draws these directly to the vid buffer }