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engines/icb/gfx/psx_scrn.h
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237
engines/icb/gfx/psx_scrn.h
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/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* Additional copyright for this file:
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* Copyright (C) 1999-2000 Revolution Software Ltd.
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* This code is based on source code created by Revolution Software,
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* used with permission.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef ICB_PSX_SCRN_H
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#define ICB_PSX_SCRN_H
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#include "engines/icb/psx_config.h"
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#include "engines/icb/gfx/psx_pcgpu.h"
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#include "engines/icb/gfx/psx_pcdefines.h"
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#include "engines/icb/gfx/psx_ot.h"
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#include "common/util.h"
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namespace ICB {
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typedef struct DoubleBuffer {
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DRAWENV draw; /* drawing environment */
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DISPENV disp; /* display environment */
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} DoubleBuffer;
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#define SCREEN_W 640
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#define SCREEN_H 480
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#define MIN_SCREEN_X (0)
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#define MAX_SCREEN_X (SCREEN_W - 1)
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#define MIN_SCREEN_Y (0)
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#define MAX_SCREEN_Y (SCREEN_H - 1)
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#define MSG_X 20
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#define MSG_Y (SCREEN_H - 40)
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#define MSG_W SCREEN_W
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#define MSG_H 10
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// Length of the OT
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#define OT_LENGTH 16 // bit length of OT
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#define OT_SIZE (1 << OT_LENGTH)
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// The PSX Data-cache which is 1KB big
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#define D_CACHE getScratchAddr(0)
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#define D_CACHE_SIZE 1024
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// Number of DR_LOAD primitives to allocate
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// #define MAX_DRLOADS 2048
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// Screen position for 0,0
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extern int32 scrn_ox;
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extern int32 scrn_oy;
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// Global double buffer and drawing functions
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void SwapDoubleBuffer(void);
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void SwapBufferIndex(void);
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void DrawDisplayList(int32 buf);
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void Init_display(int32 w, int32 h, int32 x1, int32 y1, int32 x2, int32 y2, int32 ox, int32 oy, int32 clear);
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void RenderCycle(void);
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// Global double buffer and drawing variables
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extern OT_tag *otarray[2];
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extern OT_tag *drawot;
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extern int32 drawBuf;
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extern int32 dont_set_dispbuf;
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extern DoubleBuffer db[2];
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extern DoubleBuffer *pdb;
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extern uint32 reloadFont;
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extern int32 global_use_otlist;
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// A global array place in which to create GPU packets
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typedef uint8 GPUPACKET;
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extern GPUPACKET *drawpacket;
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extern GPUPACKET *drawpacketStart;
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extern GPUPACKET *drawpacketEnd;
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// For tracking the maximum number of packets used
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extern int32 globalPacketMax;
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extern int32 packetsUsed;
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// How much to shift & then offset the z values from gte to
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// put them into the otlist
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extern int32 g_otz_shift;
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extern int32 g_otz_offset;
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// Enable/disable updating of the auto-sliding & scaling min,max z position
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extern int32 update_minmaxzpos;
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// Global graphics options for z-clipping and camera scalings
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extern int32 minZOTpos;
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extern int32 maxZOTpos;
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extern int32 minUsedZpos;
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extern int32 maxUsedZpos;
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extern int32 nearClip;
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#if (_PSX_ON_PC == 0) && (_PSX == 1)
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// Number of GPU packets to reserve
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#define PACKETMAX 1500
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// the size of a POLY_GT3 packet
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#define PACKETSIZE sizeof(POLY_GT3)
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// a full-up DR_LOAD is 17 int32s (68 bytes) and is the biggest type of packet
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#define PACKET_MAX_SIZE sizeof(DR_LOAD)
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#define PACKETMEM (PACKETMAX * PACKETSIZE)
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// this is the nick pelling speed-up bit
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#define set3(_r0, _r1) __asm__ volatile("swl %1, 2( %0 )" : : "r"(_r0), "r"(_r1) : "memory")
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static inline uint32 get3(void *_r0) {
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register uint32 t;
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__asm__ volatile("lwl %0, 2( %1 )" : "=r"(t) : "r"(_r0) : "memory");
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return t;
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}
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#ifdef setaddr
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#undef setaddr
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#undef getaddr
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#undef addPrim
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#undef addPrims
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#endif
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#define setaddr(_p0, _p1) set3((_p0), ((uint32)(_p1)) << 8)
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#define getaddr(_p) (get3(_p) >> 8)
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static inline void addPrim(uint32 *ot, void *p) {
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uint32 tmp = get3(ot); // lwl
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setaddr(ot, p); // sll, swl
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set3(p, tmp); // swl
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}
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static inline void addPrims(uint32 *ot, void *p0, void *p1) {
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uint32 tmp = get3(ot); // lwl
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setaddr(ot, p0); // sll, swl
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set3(p1, tmp); // swl
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}
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#endif // #if (_PSX_ON_PC == 0) && (_PSX==1)
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// Cheers to Nick Pelling for this excellent mySetDrawLoad
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// This one is a straight forward inline version of SetDrawLoad
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// and adds the DR_FLUSH onto the end
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static inline void mySetDrawLoad(DR_LOAD *p, RECT16 *r, int32 length) {
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p->code[0] = (uint32)(0xA0 << 24); // 0xA0000000
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p->code[1] = *((uint32 *)r);
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p->code[2] = *((uint32 *)r + 1);
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setlen(p, (1 + 2 + 1 + length)); // code=1 RECT=2 DR_FLUSH=1 data=length
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p->p[length] = 0x01 << 24; // DR_FLUSH
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}
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// This one is just like SetDrawLoad but does not add the DR_FLUSH on the end
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static inline void mySetDrawLoadNoFlush(DR_LOAD *p, RECT16 *r, int32 length) {
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p->code[0] = (uint32)(0xA0 << 24); // 0xA0000000
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p->code[1] = *((uint32 *)r);
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p->code[2] = *((uint32 *)r + 1);
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setlen(p, (1 + 2 + length)); // code=1 RECT=2 data=length
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p->p[length] = 0x01 << 24; // DR_FLUSH
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}
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// Handy function for using the packets global array
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static inline void myAddPacket(int32 len) {
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// Advance to next spot :
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// can still fail e.g. add a small packet then try to add a large packet
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drawpacket += len;
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if (drawpacket >= drawpacketEnd) {
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drawpacket = drawpacketStart;
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}
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}
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// Handy function for putting a DR_LOAD into the packets global array
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static inline void myAddDRLOAD(RECT16 *r, uint32 *pot, int32 length) {
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mySetDrawLoad((DR_LOAD *)drawpacket, r, length);
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addPrim(pot, drawpacket);
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myAddPacket(((5 + length) << 2));
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}
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// Handy function for putting a DR_LOAD into the packets global array
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// but without adding a DR_FLUSH onto the end
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static inline void myAddDRLOADNoFlush(RECT16 *r, uint32 *pot, int32 length) {
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mySetDrawLoadNoFlush((DR_LOAD *)drawpacket, r, length);
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addPrim(pot, drawpacket);
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myAddPacket(((4 + length) << 2));
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}
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// Little to convert a z-value into an OT position
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static inline int32 myMakeOTPosition(int32 z0) {
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int32 z1 = (z0 >> g_otz_shift) - g_otz_offset;
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minUsedZpos = MIN(z0, minUsedZpos);
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maxUsedZpos = MAX(z0, maxUsedZpos);
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z1 = MAX(minZOTpos, z1);
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z1 = MIN(maxZOTpos, z1);
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return z1;
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}
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// My own add prim function which automatically computes the correct
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// index in the OT and also performs simple near,far z clipping
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static inline int32 myAddPrimClip(int32 z0, void *primitive) {
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int32 otpos = myMakeOTPosition(z0);
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if (otpos == -1)
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return -1; // ignore out of clipping range
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#if (_PSX_ON_PC == 1) || (_PSX == 0)
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z0 = z0 >> 2; // Divide z by 4 so it matches background units
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addPrimZUsr(drawot + otpos, primitive, z0, OTusrData);
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#else
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addPrim(drawot + otpos, primitive);
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#endif
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return otpos;
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}
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} // End of namespace ICB
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#endif // #ifndef PSX_SCRN_H
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