src/video/nds/SDL_ndsvideo.c
branchgsoc2008_nds
changeset 2670 6e4669f4db49
child 2671 c3e7c0698cbb
equal deleted inserted replaced
2669:e27bdcc80744 2670:6e4669f4db49
       
     1 /*
       
     2     SDL - Simple DirectMedia Layer
       
     3     Copyright (C) 1997-2006 Sam Lantinga
       
     4 
       
     5     This library is free software; you can redistribute it and/or
       
     6     modify it under the terms of the GNU Lesser General Public
       
     7     License as published by the Free Software Foundation; either
       
     8     version 2.1 of the License, or (at your option) any later version.
       
     9 
       
    10     This library is distributed in the hope that it will be useful,
       
    11     but WITHOUT ANY WARRANTY; without even the implied warranty of
       
    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       
    13     Lesser General Public License for more details.
       
    14 
       
    15     You should have received a copy of the GNU Lesser General Public
       
    16     License along with this library; if not, write to the Free Software
       
    17     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
       
    18 
       
    19     Sam Lantinga
       
    20     slouken@libsdl.org
       
    21 */
       
    22 #include "SDL_config.h"
       
    23 
       
    24 /* Dummy SDL video driver implementation; this is just enough to make an
       
    25  *  SDL-based application THINK it's got a working video driver, for
       
    26  *  applications that call SDL_Init(SDL_INIT_VIDEO) when they don't need it,
       
    27  *  and also for use as a collection of stubs when porting SDL to a new
       
    28  *  platform for which you haven't yet written a valid video driver.
       
    29  *
       
    30  * This is also a great way to determine bottlenecks: if you think that SDL
       
    31  *  is a performance problem for a given platform, enable this driver, and
       
    32  *  then see if your application runs faster without video overhead.
       
    33  *
       
    34  * Initial work by Ryan C. Gordon (icculus@icculus.org). A good portion
       
    35  *  of this was cut-and-pasted from Stephane Peter's work in the AAlib
       
    36  *  SDL video driver.  Renamed to "DUMMY" by Sam Lantinga.
       
    37  */
       
    38 
       
    39 #include <stdio.h>
       
    40 #include <stdlib.h>
       
    41 #include <nds.h>
       
    42 
       
    43 #include "SDL_video.h"
       
    44 #include "SDL_mouse.h"
       
    45 #include "../SDL_sysvideo.h"
       
    46 #include "../SDL_pixels_c.h"
       
    47 #include "../../events/SDL_events_c.h"
       
    48 
       
    49 #include "SDL_ndsvideo.h"
       
    50 #include "SDL_ndsevents_c.h"
       
    51 #include "SDL_ndsrender_c.h"
       
    52 
       
    53 #define NDSVID_DRIVER_NAME "nds"
       
    54 
       
    55 /* Initialization/Query functions */
       
    56 static int NDS_VideoInit(_THIS);
       
    57 static int NDS_SetDisplayMode(_THIS, SDL_DisplayMode * mode);
       
    58 static void NDS_VideoQuit(_THIS);
       
    59 
       
    60 /* DUMMY driver bootstrap functions */
       
    61 
       
    62 static int
       
    63 NDS_Available(void)
       
    64 {
       
    65     const char *envr = SDL_getenv("SDL_VIDEODRIVER");
       
    66 	printf("NDS_Available()\n");
       
    67     return (1);
       
    68 }
       
    69 
       
    70 static void
       
    71 NDS_DeleteDevice(SDL_VideoDevice * device)
       
    72 {
       
    73     SDL_free(device);
       
    74 }
       
    75 
       
    76 static SDL_VideoDevice *
       
    77 NDS_CreateDevice(int devindex)
       
    78 {
       
    79     SDL_VideoDevice *device;
       
    80 	printf("NDS_CreateDevice(%d)\n", devindex);
       
    81 
       
    82     /* Initialize all variables that we clean on shutdown */
       
    83     device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
       
    84     if (!device) {
       
    85         SDL_OutOfMemory();
       
    86         if (device) {
       
    87             SDL_free(device);
       
    88         }
       
    89         return (0);
       
    90     }
       
    91 
       
    92     /* Set the function pointers */
       
    93     device->VideoInit = NDS_VideoInit;
       
    94     device->VideoQuit = NDS_VideoQuit;
       
    95     device->SetDisplayMode = NDS_SetDisplayMode;
       
    96     device->PumpEvents = NDS_PumpEvents;
       
    97 
       
    98     device->num_displays = 2; /* DS = dual screens */
       
    99 
       
   100     device->free = NDS_DeleteDevice;
       
   101 
       
   102     return device;
       
   103 }
       
   104 
       
   105 VideoBootStrap NDS_bootstrap = {
       
   106     NDSVID_DRIVER_NAME, "SDL NDS video driver",
       
   107     NDS_Available, NDS_CreateDevice
       
   108 };
       
   109 
       
   110 int
       
   111 NDS_VideoInit(_THIS)
       
   112 {
       
   113     SDL_DisplayMode mode;
       
   114     int i;
       
   115 
       
   116     /* simple 256x192x16x60 for now */
       
   117     mode.w = 256;  mode.h = 192;
       
   118     mode.format = SDL_PIXELFORMAT_ARGB1555;
       
   119     mode.refresh_rate = 60;
       
   120     mode.driverdata = NULL;
       
   121 
       
   122     SDL_AddBasicVideoDisplay(&mode);
       
   123     SDL_AddRenderDriver(0, &SDL_NDS_RenderDriver);
       
   124 
       
   125     SDL_zero(mode);
       
   126     SDL_AddDisplayMode(0, &mode);
       
   127 
       
   128 	/* hackish stuff to get things up and running for now, and for a console */
       
   129 	powerON(POWER_ALL);
       
   130 	videoSetMode(MODE_FB0);
       
   131 	videoSetModeSub(MODE_0_2D | DISPLAY_BG0_ACTIVE); /* debug text on sub */
       
   132 	vramSetBankA(VRAM_A_LCD);
       
   133 	vramSetBankC(VRAM_C_SUB_BG);
       
   134 	irqInit();
       
   135 	irqEnable(IRQ_VBLANK);
       
   136     /* set up console for debug text 'n stuff */
       
   137     SUB_BG0_CR = BG_MAP_BASE(31); BG_PALETTE_SUB[255] = RGB15(31,31,31);
       
   138 	consoleInitDefault((u16*)SCREEN_BASE_BLOCK_SUB(31),
       
   139 	                   (u16*)CHAR_BASE_BLOCK_SUB(0), 16);
       
   140     for(i = 0; i < 256*192; ++i) {
       
   141 		((u16*)VRAM_A)[i] = i;
       
   142 	}
       
   143 	for(i = 0; i < 60; ++i) swiWaitForVBlank();
       
   144     /*NDS_SetDisplayMode(_this, &mode);*/
       
   145     return 0;
       
   146 }
       
   147 
       
   148 static int
       
   149 NDS_SetDisplayMode(_THIS, SDL_DisplayMode * mode)
       
   150 {
       
   151 	/* right now this function is just hard-coded for 256x192 ARGB1555 */
       
   152 #if 0
       
   153 	videoSetMode(MODE_5_2D | DISPLAY_BG3_ACTIVE); /* display on main core */
       
   154     videoSetModeSub(MODE_0_2D | DISPLAY_BG0_ACTIVE); /* debug text on sub */
       
   155     vramSetMainBanks(VRAM_A_MAIN_BG_0x06000000, VRAM_B_LCD,
       
   156                      VRAM_C_SUB_BG, VRAM_D_LCD);
       
   157 
       
   158     /* maps well to the 256x192 screen anyway.  note: need VRAM_B for bigger */
       
   159     BG3_CR = BG_BMP16_256x256;
       
   160     /* affine transformation matrix.  nothing too fancy here */
       
   161 	BG3_XDX = 0x100;    BG3_XDY = 0;
       
   162 	BG3_YDX = 0;        BG3_YDY = 0x100;
       
   163 	/* x/y position */
       
   164 	BG3_CX = 0;         BG3_CY = 0;
       
   165 #endif
       
   166     return 0;
       
   167 }
       
   168 
       
   169 void
       
   170 NDS_VideoQuit(_THIS)
       
   171 {
       
   172 }
       
   173 
       
   174 /* vi: set ts=4 sw=4 expandtab: */