4 * The PC side of the video support (responsible for actually displaying /
7 * Copyright (c) 2005 Nathan Keynes.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
22 #include <gdk-pixbuf/gdk-pixbuf.h>
23 #include <gtk/gtkwidget.h>
24 #include <GL/osmesa.h>
30 extern GtkWidget *gtk_video_win;
31 extern int video_width, video_height;
33 static render_buffer_t gdk_pixbuf_create_render_buffer( uint32_t width, uint32_t height );
34 static void gdk_pixbuf_destroy_render_buffer( render_buffer_t buffer );
35 static gboolean gdk_pixbuf_set_render_target( render_buffer_t buffer );
36 static gboolean gdk_pixbuf_display_render_buffer( render_buffer_t buffer );
37 static void gdk_pixbuf_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer );
38 static gboolean gdk_pixbuf_display_blank( uint32_t colour );
39 static gboolean gdk_pixbuf_read_render_buffer( unsigned char *target, render_buffer_t buffer, int rowstride, int format );
41 static void *pixbuf_array[MAX_PIXBUF];
42 unsigned int pixbuf_max = 0;
43 OSMesaContext osmesa_context = NULL;
45 void video_gdk_init_driver( display_driver_t driver )
48 driver->create_render_buffer = gdk_pixbuf_create_render_buffer;
49 driver->destroy_render_buffer = gdk_pixbuf_destroy_render_buffer;
50 driver->set_render_target = gdk_pixbuf_set_render_target;
51 driver->display_render_buffer = gdk_pixbuf_display_render_buffer;
52 driver->load_frame_buffer = gdk_pixbuf_load_frame_buffer;
53 driver->display_blank = gdk_pixbuf_display_blank;
54 driver->read_render_buffer = gdk_pixbuf_read_render_buffer;
56 osmesa_context = OSMesaCreateContextExt( OSMESA_RGBA, 32, 0, 0, 0 );
57 OSMesaMakeCurrent( osmesa_context, NULL, GL_UNSIGNED_BYTE, 640, 480 );
61 int video_gdk_find_free()
64 for( i=0; i<pixbuf_max; i++ ) {
65 if( pixbuf_array[i] == NULL ) {
69 if( i < MAX_PIXBUF ) {
75 void video_gdk_shutdown()
78 for( i=0; i<pixbuf_max; i++ ) {
79 if( pixbuf_array[i] != NULL ) {
80 g_free(pixbuf_array[i]);
81 pixbuf_array[i] = NULL;
85 OSMesaDestroyContext( osmesa_context );
89 static render_buffer_t gdk_pixbuf_create_render_buffer( uint32_t width, uint32_t height )
91 render_buffer_t buf = g_malloc0(sizeof(struct render_buffer));
92 gboolean alpha = FALSE;
95 buf->buf_id = video_gdk_find_free();
96 pixbuf_array[buf->buf_id] = g_malloc0( width * height * 4 );
100 static void gdk_pixbuf_destroy_render_buffer( render_buffer_t buffer )
102 g_free(pixbuf_array[buffer->buf_id] );
103 pixbuf_array[buffer->buf_id] = NULL;
104 if( buffer->buf_id == (pixbuf_max-1) ) {
109 static gboolean gdk_pixbuf_display_render_buffer( render_buffer_t buffer )
113 void *pb = pixbuf_array[buffer->buf_id];
114 GdkGC *gc = gtk_video_win->style->fg_gc[GTK_STATE_NORMAL];
115 GdkColor black = {0,0,0,0};
119 int x1=0,y1=0,x2=video_width,y2=video_height;
121 int ah = video_width * 0.75;
124 if( ah > video_height ) {
125 int w = (video_height/0.75);
126 x1 = (video_width - w)/2;
128 gdk_gc_set_foreground( gc, &black );
129 gdk_gc_set_background( gc, &black );
130 gdk_draw_rectangle( gtk_video_win->window, gc, TRUE, 0, 0, x1, video_height );
131 gdk_draw_rectangle( gtk_video_win->window, gc, TRUE, x2, 0, video_width, video_height );
132 } else if( ah < video_height ) {
133 y1 = (video_height - ah)/2;
135 gdk_gc_set_foreground( gc, &black );
136 gdk_gc_set_background( gc, &black );
137 gdk_draw_rectangle( gtk_video_win->window, gc, TRUE, 0, 0, video_width, y1 );
138 gdk_draw_rectangle( gtk_video_win->window, gc, TRUE, 0, y2, video_width, video_height );
143 if( w != buffer->width || h != buffer->height ) {
144 gdk_draw_rgb_32_image( gtk_video_win->window, gc, x1, y1, buffer->width, buffer->height, GDK_RGB_DITHER_NONE,
145 pb, buffer->width*4 );
147 gdk_draw_rgb_32_image( gtk_video_win->window, gc, x1, y1, buffer->width, buffer->height, GDK_RGB_DITHER_NONE,
148 pb, buffer->width*4 );
152 static gboolean gdk_pixbuf_display_blank( uint32_t colour )
154 GdkGC *gc = gtk_video_win->style->fg_gc[GTK_STATE_NORMAL];
157 gdk_gc_set_foreground( gc, &col );
158 gdk_gc_set_background( gc, &col );
159 gdk_draw_rectangle( gtk_video_win->window, gc, TRUE, 0, 0, video_width, video_height );
163 static gboolean gdk_pixbuf_set_render_target( render_buffer_t buffer )
166 void *pb = pixbuf_array[buffer->buf_id];
167 OSMesaMakeCurrent( osmesa_context, pb, GL_UNSIGNED_BYTE,
168 buffer->width, buffer->height );
169 //OSMesaPixelStore( OSMESA_Y_UP, 0 );
170 glViewport( 0, 0, buffer->width, buffer->height );
171 glDrawBuffer(GL_FRONT);
175 static void gdk_pixbuf_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer )
178 void *pb = pixbuf_array[buffer->buf_id];
179 OSMesaMakeCurrent( osmesa_context, pb, GL_UNSIGNED_BYTE,
180 buffer->width, buffer->height );
181 GLenum type = colour_formats[frame->colour_format].type;
182 GLenum format = colour_formats[frame->colour_format].format;
183 int bpp = colour_formats[frame->colour_format].bpp;
184 int rowstride = (frame->rowstride / bpp) - frame->width;
187 glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
188 glRasterPos2f(0.375, frame->height-0.375);
189 glPixelZoom( 1.0, 1.0 );
190 glDrawPixels( frame->width, frame->height, format, type, frame->data );
194 static gboolean gdk_pixbuf_read_render_buffer( unsigned char *target, render_buffer_t buffer, int rowstride, int format )
197 void *pb = pixbuf_array[buffer->buf_id];
198 OSMesaMakeCurrent( osmesa_context, pb, GL_UNSIGNED_BYTE,
199 buffer->width, buffer->height );
200 glReadBuffer( GL_FRONT );
201 return gl_read_render_buffer( target, buffer, rowstride, format );
.