source: abuse/trunk/src/sdlport/video.cpp @ 56 Tweet

/*
 *  Abuse - dark 2D side-scrolling platform game
 *  Copyright (c) 2001 Anthony Kruize <trandor@labyrinth.net.au>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software Foundation,
 *  Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 */

#include "config.h"

#include <SDL.h>
#ifdef HAVE_OPENGL
#ifdef __APPLE__
#include <OpenGL/gl.h>
#include <OpenGL/glu.h>
#else
#include <GL/gl.h>
#include <GL/glu.h>
#endif  /* __APPLE__ */
#endif  /* HAVE_OPENGL */
#include "filter.hpp"
#include "globals.hpp"
#include "system.h"
#include "video.hpp"
#include "macs.hpp"
#include "image.hpp"
#include "jmalloc.hpp"
#include "setup.h"

SDL_Surface *window = NULL, *surface = NULL;
image *screen = NULL;
unsigned char current_background;
int win_xscale, win_yscale, mouse_xscale, mouse_yscale;
extern unsigned int xres, yres;
extern palette *lastl;
extern flags_struct flags;
#ifdef HAVE_OPENGL
GLfloat texcoord[4];
GLuint texid;
SDL_Surface *texture = NULL;
#endif

// Forward declarations
void update_window_part(SDL_Rect *rect);
void update_window_done();

//
// power_of_two()
// Get the nearest power of two
//
static int power_of_two(int input)
{
        int value;
        for( value = 1 ; value < input ; value <<= 1);
        return value;
}

//
// set_mode()
// Set the video mode
//
void set_mode( int mode, int argc, char **argv )
{
        const SDL_VideoInfo *vidInfo;
        int vidFlags = SDL_HWPALETTE;

        // Check for video capabilities
        vidInfo = SDL_GetVideoInfo();
        if( vidInfo->hw_available )
        {
                vidFlags |= SDL_HWSURFACE;
        }
        else
        {
                vidFlags |= SDL_SWSURFACE;
        }
        if( flags.fullscreen )
        {
                vidFlags |= SDL_FULLSCREEN;
        }
        if( flags.doublebuf )
        {
                vidFlags |= SDL_DOUBLEBUF;
        }

        // Calculate the window scale
        win_xscale = mouse_xscale = (flags.xres << 16) / xres;
        win_yscale = mouse_yscale = (flags.yres << 16) / yres;

        // Try using opengl hw accell
        if( flags.gl ) {
#ifdef HAVE_OPENGL
                printf( "Video : OpenGL enabled\n" );
                // allow doublebuffering in with gl too
                SDL_GL_SetAttribute( SDL_GL_DOUBLEBUFFER, flags.doublebuf );
                // set video gl capability
                vidFlags |= SDL_OPENGL;
                // force no scaling, let the hw do it
                win_xscale = win_yscale = 1 << 16;
#else
                // ignore the option if not available
                printf( "Video : OpenGL disabled (Support missing in executable)\n");
                flags.gl = 0;
#endif
        }

        // Set the icon for this window.  Looks nice on taskbars etc.
        SDL_WM_SetIcon( SDL_LoadBMP("abuse.bmp"), NULL );

        // Create the window with a preference for 8-bit (palette animations!), but accept any depth */
        window = SDL_SetVideoMode(flags.xres, flags.yres, 8, vidFlags | SDL_ANYFORMAT );
        if( window == NULL )
        {
                printf( "Video : Unable to set video mode : %s\n", SDL_GetError() );
                exit( 1 );
        }

        // Create the screen image
        screen = new image( xres, yres, NULL, 2 );
        if( screen == NULL )
        {
                // Our screen image is no good, we have to bail.
                printf( "Video : Unable to create screen image.\n" );
                exit( 1 );
        }
        screen->clear();

        if (flags.gl)
        {
#ifdef HAVE_OPENGL
                int w,h;

                // texture width/height should be power of 2
                w = power_of_two(xres);
                h = power_of_two(yres);

                // create texture surface
                texture = SDL_CreateRGBSurface( SDL_SWSURFACE, w ,h ,32, 
#if SDL_BYTEORDER == SDL_LIL_ENDIAN 
                                0x000000FF, 0x0000FF00, 0x00FF0000, 0xFF000000 );
#else
                                0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF );
#endif

                // setup 2D gl environment
                glPushAttrib(GL_ENABLE_BIT);
                glDisable(GL_DEPTH_TEST);
                glDisable(GL_CULL_FACE);
                glEnable(GL_TEXTURE_2D);

                glViewport(0, 0, window->w, window->h);

                glMatrixMode(GL_PROJECTION);
                glPushMatrix();
                glLoadIdentity();

                glOrtho(0.0, (GLdouble)window->w, (GLdouble)window->h, 0.0, 0.0,1.0);

                glMatrixMode(GL_MODELVIEW);
                glPushMatrix();
                glLoadIdentity();

                // texture coordinates
                texcoord[0] = 0.0f;
                texcoord[1] = 0.0f;
                texcoord[2] = (GLfloat)xres / texture->w;
                texcoord[3] = (GLfloat)yres / texture->h;

                // create an RGBA texture for the texture surface
                glGenTextures(1, &texid);
                glBindTexture(GL_TEXTURE_2D, texid);
                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, flags.antialias);
                glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, flags.antialias);
                glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, texture->w, texture->h, 0, GL_RGBA, GL_UNSIGNED_BYTE, texture->pixels );
#endif
        }

        // Create our 8-bit surface
        surface = SDL_CreateRGBSurface( SDL_SWSURFACE, window->w, window->h, 8, 0xff, 0xff, 0xff, 0xff );
        if( surface == NULL )
        {
                // Our surface is no good, we have to bail.
                printf( "Video : Unable to create 8-bit surface.\n" );
                exit( 1 );
        }

        printf( "Video : %dx%d %dbpp\n", window->w, window->h, window->format->BitsPerPixel );

        // Set the window caption
        SDL_WM_SetCaption( "Abuse-SDL", "Abuse-SDL" );

        // Grab and hide the mouse cursor
        SDL_ShowCursor( 0 );
        if( flags.grabmouse )
        {
                SDL_WM_GrabInput( SDL_GRAB_ON );
        }

        update_dirty( screen );
}

//
// close_graphics()
// Shutdown the video mode
//
void close_graphics()
{
        if( lastl )
        {
                delete lastl;
        }
        lastl = NULL;
        // Free our 8-bit surface
        if( surface )
        {
                SDL_FreeSurface( surface );
        }
#ifdef HAVE_OPENGL
        if ( texture )
        {
                SDL_FreeSurface( texture );
        }
#endif
        delete screen;
}

// put_part_image()
// Draw only dirty parts of the image
//
void put_part_image( image *im, int x, int y, int x1, int y1, int x2, int y2 )
{
        int xe, ye;
        SDL_Rect srcrect, dstrect;
        int ii, jj;
        int srcx, srcy, xstep, ystep;
        Uint8 *dpixel;
        Uint16 dinset;

        if( (unsigned)y > yres || (unsigned)x > xres )
        {
                return;
        }
        CHECK( x1 >= 0 && x2 >= x1 && y1 >= 0 && y2 >= y1 );

        // Adjust if we are trying to draw off the screen
        if( x < 0 )
        {
                x1 += -x;
                x = 0;
        }
        srcrect.x = x1;
        if( (unsigned)(x + ( x2 - x1 )) >= xres )
        {
                xe = xres - x + x1 - 1;
        }
        else
        {
                xe = x2;
        }
        if( y < 0 )
        {
                y1 += -y;
                y = 0;
        }
        srcrect.y = y1;
        if( (unsigned)(y + ( y2 - y1 )) >= yres )
        {
                ye = yres - y + y1 - 1;
        }
        else
        {
                ye = y2;
        }
        if( srcrect.x >= xe || srcrect.y >= ye )
                return;

        // Scale the image onto the surface
        srcrect.w = xe - srcrect.x;
        srcrect.h = ye - srcrect.y;
        dstrect.x = ((x * win_xscale) >> 16);
        dstrect.y = ((y * win_yscale) >> 16);
        dstrect.w = ((srcrect.w * win_xscale) >> 16);
        dstrect.h = ((srcrect.h * win_yscale) >> 16);

        xstep = (srcrect.w << 16) / dstrect.w;
        ystep = (srcrect.h << 16) / dstrect.h;

        srcy = ((srcrect.y) << 16);
        dinset = ((surface->w - dstrect.w)) * surface->format->BytesPerPixel;

        // Lock the surface if necessary
        if( SDL_MUSTLOCK( surface ) )
        {
                SDL_LockSurface( surface );
        }
        dpixel = (Uint8 *)surface->pixels;
        dpixel += (dstrect.x + ((dstrect.y) * surface->w)) * surface->format->BytesPerPixel;

        // Update surface part
        if ((win_xscale==1<<16) && (win_yscale==1<<16)) // no scaling or hw scaling
        {
                srcy = srcrect.y;
                dpixel = ((Uint8 *)surface->pixels) + y * surface->w + x ;
                for( ii=0 ; ii < srcrect.h; ii++ )
                {
                        memcpy( dpixel, im->scan_line( srcy ) + srcrect.x , srcrect.w );
                        dpixel += surface->w;
                        srcy ++;
                }
        }
        else    // sw scaling
        {
                xstep = (srcrect.w << 16) / dstrect.w;
                ystep = (srcrect.h << 16) / dstrect.h;

                srcy = ((srcrect.y) << 16);
                dinset = ((surface->w - dstrect.w)) * surface->format->BytesPerPixel;

                dpixel = (Uint8 *)surface->pixels + (dstrect.x + ((dstrect.y) * surface->w)) * surface->format->BytesPerPixel;

                for( ii = 0; ii < dstrect.h; ii++ )
                {
                        srcx = (srcrect.x << 16);
                        for( jj = 0; jj < dstrect.w; jj++ )
                        {
                                memcpy( dpixel, im->scan_line( (srcy >> 16) ) + ((srcx >> 16) * surface->format->BytesPerPixel), surface->format->BytesPerPixel );
                                dpixel += surface->format->BytesPerPixel;
                                srcx += xstep;
                        }
                        dpixel += dinset;
                        srcy += ystep;
                }
//              dpixel += dinset;
//              srcy += ystep;
        }

        // Unlock the surface if we locked it.
        if( SDL_MUSTLOCK( surface ) )
        {
                SDL_UnlockSurface( surface );
        }

        // Now blit the surface
        update_window_part( &dstrect);
}

//
// put_image()
// Draw the entire image
//
void put_image( image * im, int x, int y )
{
        put_part_image( im, x, y, 0, 0, im->width() - 1, im->height() - 1 );
}

//
// update_dirty_window()
// Update the dirty parts of the window
//
void update_dirty_window( image *im, int xoff, int yoff )
{
        int count;
        dirty_rect *dr, *q;
        CHECK( im->special ); // make sure the image has the ability to contain dirty areas
        if( im->special->keep_dirt == 0 )
        {
                put_image( im, xoff, yoff );
        }
        else
        {
                count = im->special->dirties.number_nodes();
                if( !count )
                        return;  // if nothing to update, return
                dr = (dirty_rect *)( im->special->dirties.first() );
                while( count > 0 )
                {
                        put_part_image( im, xoff + dr->dx1, yoff + dr->dy1, dr->dx1, dr->dy1, dr->dx2 + 1, dr->dy2 + 1 );
                        q = dr;
                        dr = (dirty_rect *)( dr->next() );
                        im->special->dirties.unlink( ( linked_node *)q );
                        delete q;
                        count--;
                }
        }
}

//
// update_dirty()
// Update the dirty parts of the image
//
void update_dirty( image *im, int xoff, int yoff )
{
        update_dirty_window( im, xoff, yoff );
        update_window_done();
}

//
// make_page()
//
void image::make_page( short width, short height, unsigned char *page_buffer )
{
        if( page_buffer )
        {
                data = page_buffer;
        }
        else
        {
                data = (unsigned char *)jmalloc( width * height, "image::data" );
        }
}

//
// delete_page()
//
void image::delete_page()
{
        if( !special || !special->static_mem )
        {
                jfree( data );
        }
}

//
// load()
// Set the palette
//
void palette::load()
{
        if( lastl )
        {
                delete lastl;
        }
        lastl = copy();

        // Force to only 256 colours.
        // Shouldn't be needed, but best to be safe.
        if( ncolors > 256 )
        {
                ncolors = 256;
        }

        SDL_Color colors[ncolors];
        for( int ii = 0; ii < ncolors; ii++ )
        {
                colors[ii].r = red(ii);
                colors[ii].g = green(ii);
                colors[ii].b = blue(ii);
        }
        SDL_SetColors( surface, colors, 0, ncolors );
        if( window->format->BitsPerPixel == 8 )
        {
                SDL_SetColors( window, colors, 0, ncolors );
        }

        // Now redraw the surface
        update_window_part( NULL );
        update_window_done();
}

//
// load_nice()
//
void palette::load_nice()
{
        load();
}

// ---- support functions ----

void update_window_done()
{
        // opengl blit complete surface to window
        if (flags.gl)
        {
#ifdef HAVE_OPENGL
                // convert color-indexed surface to RGB texture
                SDL_BlitSurface( surface, NULL, texture, NULL );

                // Texturemap complete texture to surface so we have free scaling 
                // and antialiasing 
                glTexSubImage2D( GL_TEXTURE_2D,0,
                         0,0,texture->w,texture->h,
                         GL_RGBA,GL_UNSIGNED_BYTE,texture->pixels);
                glBegin(GL_TRIANGLE_STRIP);
                glTexCoord2f(texcoord[0], texcoord[1]); glVertex3i(0, 0, 0);
                glTexCoord2f(texcoord[2], texcoord[1]); glVertex3i(window->w, 0, 0);
                glTexCoord2f(texcoord[0], texcoord[3]); glVertex3i(0, window->h, 0);
                glTexCoord2f(texcoord[2], texcoord[3]); glVertex3i(window->w, window->h, 0);
                glEnd();
#endif
        }

        // swap buffers in case of double buffering
        if (flags.doublebuf)
        {
                if (flags.gl)
                {
#ifdef HAVE_OPENGL
                        SDL_GL_SwapBuffers();
#endif
                }
                else
                {
                        SDL_Flip(window);
                }
        }

        // do nothing in case of single buffering
}

void update_window_part( SDL_Rect *rect)
{
        // no partial blit's in case of opengl
        // complete blit + scaling just before flip
        if (flags.gl)
        {
                return;
        }

        SDL_BlitSurface( surface, rect, window, rect );

        // no window update needed until end of run
        if( flags.doublebuf)
        {
                return;
        }

        // update window part for single buffer
        if( rect == NULL )
        {
                SDL_UpdateRect( window, 0, 0, 0, 0 );
        }
        else
        {
                SDL_UpdateRect( window, rect->x, rect->y, rect->w, rect->h );
        }
}