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Annotation of quake1/d_init.c, revision 1.1

1.1     ! root        1: // d_init.c: rasterization driver initialization
        !             2: 
        !             3: #include "quakedef.h"
        !             4: #include "d_local.h"
        !             5: 
        !             6: #define NUM_MIPS       4
        !             7: 
        !             8: cvar_t d_subdiv16 = {"d_subdiv16", "1"};
        !             9: cvar_t d_mipcap = {"d_mipcap", "0"};
        !            10: cvar_t d_mipscale = {"d_mipscale", "1"};
        !            11: 
        !            12: surfcache_t            *d_initial_rover;
        !            13: qboolean               d_roverwrapped;
        !            14: int                            d_minmip;
        !            15: float                  d_scalemip[NUM_MIPS-1];
        !            16: 
        !            17: static float   basemip[NUM_MIPS-1] = {1.0, 0.5*0.8, 0.25*0.8};
        !            18: 
        !            19: extern int                     d_aflatcolor;
        !            20: 
        !            21: void (*d_drawspans) (espan_t *pspan);
        !            22: 
        !            23: 
        !            24: /*
        !            25: ===============
        !            26: D_Init
        !            27: ===============
        !            28: */
        !            29: void D_Init (void)
        !            30: {
        !            31: 
        !            32:        r_skydirect = 1;
        !            33: 
        !            34:        Cvar_RegisterVariable (&d_subdiv16);
        !            35:        Cvar_RegisterVariable (&d_mipcap);
        !            36:        Cvar_RegisterVariable (&d_mipscale);
        !            37: 
        !            38:        r_drawpolys = false;
        !            39:        r_worldpolysbacktofront = false;
        !            40:        r_recursiveaffinetriangles = true;
        !            41:        r_pixbytes = 1;
        !            42:        r_aliasuvscale = 1.0;
        !            43: }
        !            44: 
        !            45: 
        !            46: /*
        !            47: ===============
        !            48: D_CopyRects
        !            49: ===============
        !            50: */
        !            51: void D_CopyRects (vrect_t *prects, int transparent)
        !            52: {
        !            53: 
        !            54: // this function is only required if the CPU doesn't have direct access to the
        !            55: // back buffer, and there's some driver interface function that the driver
        !            56: // doesn't support and requires Quake to do in software (such as drawing the
        !            57: // console); Quake will then draw into wherever the driver points vid.buffer
        !            58: // and will call this function before swapping buffers
        !            59: 
        !            60:        UNUSED(prects);
        !            61:        UNUSED(transparent);
        !            62: }
        !            63: 
        !            64: 
        !            65: /*
        !            66: ===============
        !            67: D_EnableBackBufferAccess
        !            68: ===============
        !            69: */
        !            70: void D_EnableBackBufferAccess (void)
        !            71: {
        !            72:        VID_LockBuffer ();
        !            73: }
        !            74: 
        !            75: 
        !            76: /*
        !            77: ===============
        !            78: D_TurnZOn
        !            79: ===============
        !            80: */
        !            81: void D_TurnZOn (void)
        !            82: {
        !            83: // not needed for software version
        !            84: }
        !            85: 
        !            86: 
        !            87: /*
        !            88: ===============
        !            89: D_DisableBackBufferAccess
        !            90: ===============
        !            91: */
        !            92: void D_DisableBackBufferAccess (void)
        !            93: {
        !            94:        VID_UnlockBuffer ();
        !            95: }
        !            96: 
        !            97: 
        !            98: /*
        !            99: ===============
        !           100: D_SetupFrame
        !           101: ===============
        !           102: */
        !           103: void D_SetupFrame (void)
        !           104: {
        !           105:        int             i;
        !           106: 
        !           107:        if (r_dowarp)
        !           108:                d_viewbuffer = r_warpbuffer;
        !           109:        else
        !           110:                d_viewbuffer = (void *)(byte *)vid.buffer;
        !           111: 
        !           112:        if (r_dowarp)
        !           113:                screenwidth = WARP_WIDTH;
        !           114:        else
        !           115:                screenwidth = vid.rowbytes;
        !           116: 
        !           117:        d_roverwrapped = false;
        !           118:        d_initial_rover = sc_rover;
        !           119: 
        !           120:        d_minmip = d_mipcap.value;
        !           121:        if (d_minmip > 3)
        !           122:                d_minmip = 3;
        !           123:        else if (d_minmip < 0)
        !           124:                d_minmip = 0;
        !           125: 
        !           126:        for (i=0 ; i<(NUM_MIPS-1) ; i++)
        !           127:                d_scalemip[i] = basemip[i] * d_mipscale.value;
        !           128: 
        !           129: #if    id386
        !           130:                                if (d_subdiv16.value)
        !           131:                                        d_drawspans = D_DrawSpans16;
        !           132:                                else
        !           133:                                        d_drawspans = D_DrawSpans8;
        !           134: #else
        !           135:                                d_drawspans = D_DrawSpans8;
        !           136: #endif
        !           137: 
        !           138:        d_aflatcolor = 0;
        !           139: }
        !           140: 
        !           141: 
        !           142: /*
        !           143: ===============
        !           144: D_UpdateRects
        !           145: ===============
        !           146: */
        !           147: void D_UpdateRects (vrect_t *prect)
        !           148: {
        !           149: 
        !           150: // the software driver draws these directly to the vid buffer
        !           151: 
        !           152:        UNUSED(prect);
        !           153: }
        !           154: 

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