src/video/nds/SDL_ndsvideo.c
author Darren Alton <dalton@stevens.edu>
Sat, 19 Jul 2008 17:37:19 +0000
branchgsoc2008_nds
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parent 2679 bc3e3e889f6d
child 2681 c15b6c758be5
permissions -rw-r--r--
More work on the accelerated 2D video driver, beginnings of sprite-based rendering support. Also some initial work on an audio driver.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library 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 GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/* SDL Nintendo DS video driver implementation
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 * based on dummy driver:
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 * Initial work by Ryan C. Gordon (icculus@icculus.org). A good portion
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 *  of this was cut-and-pasted from Stephane Peter's work in the AAlib
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 *  SDL video driver.  Renamed to "DUMMY" by Sam Lantinga.
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 */
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#include <stdio.h>
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#include <stdlib.h>
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#include <nds.h>
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#include <nds/arm9/sprite.h>
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#include <nds/arm9/trig_lut.h>
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#include <nds/arm9/video.h>
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#include "SDL_video.h"
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#include "SDL_mouse.h"
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#include "../SDL_sysvideo.h"
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#include "../SDL_pixels_c.h"
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#include "../../events/SDL_events_c.h"
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#include "SDL_ndsvideo.h"
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#include "SDL_ndsevents_c.h"
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#include "SDL_ndsrender_c.h"
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#define NDSVID_DRIVER_NAME "nds"
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/* Initialization/Query functions */
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static int NDS_VideoInit(_THIS);
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static int NDS_SetDisplayMode(_THIS, SDL_DisplayMode * mode);
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static void NDS_VideoQuit(_THIS);
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/* NDS sprite-related functions */
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#define SPRITE_DMA_CHANNEL 3
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#define SPRITE_ANGLE_MASK 0x01FF
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void
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NDS_OAM_Update(tOAM *oam)
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{
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    DC_FlushAll();
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    dmaCopyHalfWords(SPRITE_DMA_CHANNEL, oam->spriteBuffer, OAM,
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                     SPRITE_COUNT * sizeof(SpriteEntry));
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}
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void
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NDS_OAM_RotateSprite(SpriteRotation *spriteRotation, u16 angle)
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{
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    s16 s = SIN[angle & SPRITE_ANGLE_MASK] >> 4;
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    s16 c = COS[angle & SPRITE_ANGLE_MASK] >> 4;
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    spriteRotation->hdx = c;
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    spriteRotation->hdy = s;
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    spriteRotation->vdx = -s;
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    spriteRotation->vdy = c;
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}
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void
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NDS_OAM_Init(tOAM *oam)
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{
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    int i;
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    for(i = 0; i < SPRITE_COUNT; i++) {
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        oam->spriteBuffer[i].attribute[0] = ATTR0_DISABLED;
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        oam->spriteBuffer[i].attribute[1] = 0;
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        oam->spriteBuffer[i].attribute[2] = 0;
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    }
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    for(i = 0; i < MATRIX_COUNT; i++) {
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        NDS_OAM_RotateSprite(&(oam->matrixBuffer[i]), 0);
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    }
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    swiWaitForVBlank();
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    NDS_OAM_Update(oam);
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}
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void
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NDS_OAM_HideSprite(SpriteEntry *spriteEntry)
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{
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    spriteEntry->isRotoscale = 0;
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    spriteEntry->isHidden = 1;
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}
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void
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NDS_OAM_ShowSprite(SpriteEntry *spriteEntry, int affine, int double_bound)
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{
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    if (affine) {
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        spriteEntry->isRotoscale = 1;
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        spriteEntry->rsDouble = double_bound;
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    } else {
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        spriteEntry->isHidden = 0;
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    }
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}
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/* SDL NDS driver bootstrap functions */
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static int
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NDS_Available(void)
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{
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    /*const char *envr = SDL_getenv("SDL_VIDEODRIVER");*/
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    /*printf("NDS_Available()\n"); */
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    return (1);
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}
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static void
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NDS_DeleteDevice(SDL_VideoDevice * device)
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{
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    SDL_free(device);
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}
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static SDL_VideoDevice *
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NDS_CreateDevice(int devindex)
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{
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    SDL_VideoDevice *device;
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    /*printf("NDS_CreateDevice(%d)\n", devindex); */
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printf("+NDS_CreateDevice\n");
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    /* Initialize all variables that we clean on shutdown */
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    device = (SDL_VideoDevice *) SDL_calloc(1, sizeof(SDL_VideoDevice));
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    if (!device) {
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        SDL_OutOfMemory();
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        if (device) {
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            SDL_free(device);
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        }
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        return (0);
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    }
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    /* Set the function pointers */
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    device->VideoInit = NDS_VideoInit;
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    device->VideoQuit = NDS_VideoQuit;
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    device->SetDisplayMode = NDS_SetDisplayMode;
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    device->PumpEvents = NDS_PumpEvents;
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    device->num_displays = 2;   /* DS = dual screens */
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    device->free = NDS_DeleteDevice;
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printf("-NDS_CreateDevice\n");
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    return device;
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}
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VideoBootStrap NDS_bootstrap = {
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    NDSVID_DRIVER_NAME, "SDL NDS video driver",
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    NDS_Available, NDS_CreateDevice
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};
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int
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NDS_VideoInit(_THIS)
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{
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    SDL_DisplayMode mode;
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    int i;
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printf("+NDS_VideoInit\n");
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    /* simple 256x192x16x60 for now */
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    mode.w = 256;
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    mode.h = 192;
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    mode.format = SDL_PIXELFORMAT_ABGR1555;
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    mode.refresh_rate = 60;
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    mode.driverdata = NULL;
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    SDL_AddBasicVideoDisplay(&mode);
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    SDL_AddRenderDriver(0, &NDS_RenderDriver);
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    /*SDL_AddBasicVideoDisplay(&mode); two screens, same mode. uncomment later
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    SDL_AddRenderDriver(1, &NDS_RenderDriver);*/
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    SDL_zero(mode);
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    SDL_AddDisplayMode(0, &mode);
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    /* hackish stuff to get things up and running for now, and for a console */
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    powerON(POWER_ALL_2D);
    irqInit();
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    irqEnable(IRQ_VBLANK);
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    NDS_SetDisplayMode(_this, &mode);
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printf("-NDS_VideoInit\n");
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    return 0;
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}
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static int
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NDS_SetDisplayMode(_THIS, SDL_DisplayMode * mode)
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{
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printf("+NDS_SetDisplayMode\n");
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    /* right now this function is just hard-coded for 256x192 ABGR1555 */
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    videoSetMode(MODE_5_2D | DISPLAY_BG3_ACTIVE);       /* display on main core */
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    videoSetModeSub(MODE_0_2D | DISPLAY_BG0_ACTIVE);    /* debug text on sub */
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    vramSetMainBanks(VRAM_A_MAIN_BG_0x06000000, VRAM_B_MAIN_BG_0x06020000,
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                     VRAM_C_SUB_BG_0x06200000,  VRAM_C_SUB_BG_0x06220000);
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    vramSetBankE(VRAM_E_MAIN_SPRITE);
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    /* set up console for debug text 'n stuff */
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    SUB_BG0_CR = BG_MAP_BASE(31);
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    BG_PALETTE_SUB[255] = RGB15(31, 31, 31);
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   /* debugging purposes, uncomment this later.  then remove it & add 2screen.
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    consoleInitDefault((u16 *) SCREEN_BASE_BLOCK_SUB(31),
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                       (u16 *) CHAR_BASE_BLOCK_SUB(0), 16);*/
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printf("-NDS_SetDisplayMode\n");
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    return 0;
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}
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void
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NDS_VideoQuit(_THIS)
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{
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printf("+NDS_VideoQuit\n");
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    videoSetMode(DISPLAY_SCREEN_OFF);
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    videoSetModeSub(DISPLAY_SCREEN_OFF);
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    vramSetMainBanks(VRAM_A_LCD, VRAM_B_LCD, VRAM_C_LCD, VRAM_D_LCD);
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printf("-NDS_VideoQuit\n");
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}
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/* vi: set ts=4 sw=4 expandtab: */