nkeynes@635: /**
nkeynes@636:  * $Id$
nkeynes@635:  *
nkeynes@635:  * The PC side of the video support (responsible for actually displaying / 
nkeynes@635:  * rendering frames)
nkeynes@635:  *
nkeynes@635:  * Copyright (c) 2005 Nathan Keynes.
nkeynes@635:  *
nkeynes@635:  * This program is free software; you can redistribute it and/or modify
nkeynes@635:  * it under the terms of the GNU General Public License as published by
nkeynes@635:  * the Free Software Foundation; either version 2 of the License, or
nkeynes@635:  * (at your option) any later version.
nkeynes@635:  *
nkeynes@635:  * This program is distributed in the hope that it will be useful,
nkeynes@635:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@635:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@635:  * GNU General Public License for more details.
nkeynes@635:  */
nkeynes@635: #include <assert.h>
nkeynes@635: #include <stdlib.h>
nkeynes@635: #include <gdk/gdk.h>
nkeynes@635: #include <gdk-pixbuf/gdk-pixbuf.h>
nkeynes@635: #include <gtk/gtkwidget.h>
nkeynes@661: #include <GL/glu.h>
nkeynes@635: #include <GL/osmesa.h>
nkeynes@635: #include "lxdream.h"
nkeynes@635: #include "display.h"
nkeynes@635: 
nkeynes@635: #define MAX_PIXBUF 16
nkeynes@635: 
nkeynes@661: extern GtkWidget *gtk_video_drawable;
nkeynes@635: extern int video_width, video_height;
nkeynes@635: 
nkeynes@635: static render_buffer_t gdk_pixbuf_create_render_buffer( uint32_t width, uint32_t height );
nkeynes@635: static void gdk_pixbuf_destroy_render_buffer( render_buffer_t buffer );
nkeynes@635: static gboolean gdk_pixbuf_set_render_target( render_buffer_t buffer );
nkeynes@669: static void gdk_pixbuf_display_render_buffer( render_buffer_t buffer );
nkeynes@635: static void gdk_pixbuf_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer );
nkeynes@669: static void gdk_pixbuf_display_blank( uint32_t colour );
nkeynes@635: static gboolean gdk_pixbuf_read_render_buffer( unsigned char *target, render_buffer_t buffer, int rowstride, int format );
nkeynes@635: 
nkeynes@635: static void *pixbuf_array[MAX_PIXBUF];
nkeynes@635: unsigned int pixbuf_max = 0;
nkeynes@635: OSMesaContext osmesa_context = NULL;
nkeynes@635: 
nkeynes@635: void video_gdk_init_driver( display_driver_t driver )
nkeynes@635: {
nkeynes@635:     pixbuf_max = 0;
nkeynes@635:     driver->create_render_buffer = gdk_pixbuf_create_render_buffer;
nkeynes@635:     driver->destroy_render_buffer = gdk_pixbuf_destroy_render_buffer;
nkeynes@635:     driver->set_render_target = gdk_pixbuf_set_render_target;
nkeynes@635:     driver->display_render_buffer = gdk_pixbuf_display_render_buffer;
nkeynes@635:     driver->load_frame_buffer = gdk_pixbuf_load_frame_buffer;
nkeynes@635:     driver->display_blank = gdk_pixbuf_display_blank;
nkeynes@635:     driver->read_render_buffer = gdk_pixbuf_read_render_buffer;
nkeynes@635: 
nkeynes@635:     osmesa_context = OSMesaCreateContextExt( OSMESA_RGBA, 32, 0, 0, 0 );
nkeynes@635:     OSMesaMakeCurrent( osmesa_context, NULL, GL_UNSIGNED_BYTE, 640, 480 );
nkeynes@639:     pvr2_setup_gl_context();
nkeynes@635: }
nkeynes@635: 
nkeynes@635: int video_gdk_find_free()
nkeynes@635: {
nkeynes@635:     unsigned int i;
nkeynes@635:     for( i=0; i<pixbuf_max; i++ ) {
nkeynes@736:         if( pixbuf_array[i] == NULL ) {
nkeynes@736:             return i;
nkeynes@736:         }
nkeynes@635:     }
nkeynes@635:     if( i < MAX_PIXBUF ) {
nkeynes@736:         return pixbuf_max++;
nkeynes@635:     }
nkeynes@635:     return -1;
nkeynes@635: }
nkeynes@635: 
nkeynes@635: void video_gdk_shutdown()
nkeynes@635: {
nkeynes@635:     unsigned int i;
nkeynes@635:     for( i=0; i<pixbuf_max; i++ ) {
nkeynes@736:         if( pixbuf_array[i] != NULL ) {
nkeynes@736:             g_free(pixbuf_array[i]);
nkeynes@736:             pixbuf_array[i] = NULL;
nkeynes@736:         }
nkeynes@635:     }
nkeynes@635:     pixbuf_max = 0;
nkeynes@635:     OSMesaDestroyContext( osmesa_context );
nkeynes@635: }
nkeynes@635: 
nkeynes@635: 
nkeynes@635: static render_buffer_t gdk_pixbuf_create_render_buffer( uint32_t width, uint32_t height )
nkeynes@635: {
nkeynes@635:     render_buffer_t buf = g_malloc0(sizeof(struct render_buffer));
nkeynes@635:     gboolean alpha = FALSE;
nkeynes@635:     buf->width = width;
nkeynes@635:     buf->height = height;
nkeynes@635:     buf->buf_id = video_gdk_find_free();
nkeynes@635:     pixbuf_array[buf->buf_id] = g_malloc0( width * height * 4 );
nkeynes@635:     return buf;
nkeynes@635: }
nkeynes@635: 
nkeynes@635: static void gdk_pixbuf_destroy_render_buffer( render_buffer_t buffer )
nkeynes@635: {
nkeynes@635:     g_free(pixbuf_array[buffer->buf_id] );
nkeynes@635:     pixbuf_array[buffer->buf_id] = NULL;
nkeynes@635:     if( buffer->buf_id == (pixbuf_max-1) ) {
nkeynes@736:         pixbuf_max--;
nkeynes@635:     }
nkeynes@635: }
nkeynes@635: 
nkeynes@669: static void gdk_pixbuf_display_render_buffer( render_buffer_t buffer )
nkeynes@635: {
nkeynes@635:     glFinish();
nkeynes@635: 
nkeynes@635:     void *pb = pixbuf_array[buffer->buf_id];
nkeynes@661:     GdkGC *gc = gtk_video_drawable->style->fg_gc[GTK_STATE_NORMAL];
nkeynes@635:     GdkColor black = {0,0,0,0};
nkeynes@635: 
nkeynes@635:     assert(gc);
nkeynes@635: 
nkeynes@635:     int x1=0,y1=0,x2=video_width,y2=video_height;
nkeynes@635: 
nkeynes@635:     int ah = video_width * 0.75;
nkeynes@635: 
nkeynes@635: 
nkeynes@635:     if( ah > video_height ) {
nkeynes@736:         int w = (video_height/0.75);
nkeynes@736:         x1 = (video_width - w)/2;
nkeynes@736:         x2 -= x1;
nkeynes@736:         gdk_gc_set_foreground( gc, &black );
nkeynes@736:         gdk_gc_set_background( gc, &black );
nkeynes@736:         gdk_draw_rectangle( gtk_video_drawable->window, gc, TRUE, 0, 0, x1, video_height );
nkeynes@736:         gdk_draw_rectangle( gtk_video_drawable->window, gc, TRUE, x2, 0, video_width, video_height );
nkeynes@635:     } else if( ah < video_height ) {
nkeynes@736:         y1 = (video_height - ah)/2;
nkeynes@736:         y2 -= y1;
nkeynes@736:         gdk_gc_set_foreground( gc, &black );
nkeynes@736:         gdk_gc_set_background( gc, &black );
nkeynes@736:         gdk_draw_rectangle( gtk_video_drawable->window, gc, TRUE, 0, 0, video_width, y1 );
nkeynes@736:         gdk_draw_rectangle( gtk_video_drawable->window, gc, TRUE, 0, y2, video_width, video_height );
nkeynes@635:     }
nkeynes@635:     int w = x2-x1;
nkeynes@635:     int h = y2-y1;
nkeynes@736: 
nkeynes@635:     if( w != buffer->width || h != buffer->height ) {
nkeynes@736:         gdk_draw_rgb_32_image( gtk_video_drawable->window, gc, x1, y1, buffer->width, buffer->height, GDK_RGB_DITHER_NONE,
nkeynes@736:                 pb, buffer->width*4 );
nkeynes@635:     } else {
nkeynes@736:         gdk_draw_rgb_32_image( gtk_video_drawable->window, gc, x1, y1, buffer->width, buffer->height, GDK_RGB_DITHER_NONE,
nkeynes@736:                 pb, buffer->width*4 );
nkeynes@635:     }
nkeynes@635: }
nkeynes@635: 
nkeynes@669: static void gdk_pixbuf_display_blank( uint32_t colour )
nkeynes@635: {
nkeynes@661:     GdkGC *gc = gtk_video_drawable->style->fg_gc[GTK_STATE_NORMAL];
nkeynes@635:     GdkColor col = { };
nkeynes@635: 
nkeynes@635:     gdk_gc_set_foreground( gc, &col );
nkeynes@635:     gdk_gc_set_background( gc, &col );
nkeynes@661:     gdk_draw_rectangle( gtk_video_drawable->window, gc, TRUE, 0, 0, video_width, video_height );
nkeynes@635: }
nkeynes@635: 
nkeynes@635: static gboolean gdk_pixbuf_set_render_target( render_buffer_t buffer )
nkeynes@635: {
nkeynes@635:     glFinish();
nkeynes@635:     void *pb = pixbuf_array[buffer->buf_id];
nkeynes@635:     OSMesaMakeCurrent( osmesa_context, pb, GL_UNSIGNED_BYTE,
nkeynes@736:                        buffer->width, buffer->height );
nkeynes@635:     //OSMesaPixelStore( OSMESA_Y_UP, 0 );
nkeynes@635:     glViewport( 0, 0, buffer->width, buffer->height );
nkeynes@635:     glDrawBuffer(GL_FRONT);
nkeynes@635:     return TRUE;
nkeynes@635: }
nkeynes@635: 
nkeynes@635: static void gdk_pixbuf_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer )
nkeynes@635: {
nkeynes@635:     glFinish();
nkeynes@635:     void *pb = pixbuf_array[buffer->buf_id];
nkeynes@635:     OSMesaMakeCurrent( osmesa_context, pb, GL_UNSIGNED_BYTE,
nkeynes@736:                        buffer->width, buffer->height );
nkeynes@635:     GLenum type = colour_formats[frame->colour_format].type;
nkeynes@635:     GLenum format = colour_formats[frame->colour_format].format;
nkeynes@635:     int bpp = colour_formats[frame->colour_format].bpp;
nkeynes@635:     int rowstride = (frame->rowstride / bpp) - frame->width;
nkeynes@736: 
nkeynes@635:     gl_reset_state();
nkeynes@635:     glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
nkeynes@635:     glRasterPos2f(0.375, frame->height-0.375);
nkeynes@635:     glPixelZoom( 1.0, 1.0 );
nkeynes@635:     glDrawPixels( frame->width, frame->height, format, type, frame->data );
nkeynes@635:     glFlush();
nkeynes@635: }
nkeynes@635: 
nkeynes@635: static gboolean gdk_pixbuf_read_render_buffer( unsigned char *target, render_buffer_t buffer, int rowstride, int format )
nkeynes@635: {
nkeynes@635:     glFinish();
nkeynes@635:     void *pb = pixbuf_array[buffer->buf_id];
nkeynes@635:     OSMesaMakeCurrent( osmesa_context, pb, GL_UNSIGNED_BYTE,
nkeynes@736:                        buffer->width, buffer->height );
nkeynes@635:     glReadBuffer( GL_FRONT );
nkeynes@635:     return gl_read_render_buffer( target, buffer, rowstride, format );
nkeynes@635: 
nkeynes@635: }