4 * Shared functions for all X11-based display drivers.
6 * Copyright (c) 2005 Nathan Keynes.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
24 #include "pvr2/pvr2.h"
25 #include "pvr2/glutil.h"
26 #include "drivers/video_glx.h"
27 #include "drivers/video_gl.h"
30 * General X11 parameters. The front-end driver is expected to set this up
31 * by calling video_glx_init after initializing itself.
33 Display *video_x11_display = NULL;
34 Window video_x11_window = 0;
36 static int glx_version = 100;
37 static XVisualInfo *glx_visual = NULL;
38 static GLXFBConfig glx_fbconfig;
39 static GLXContext glx_context = NULL;
40 static gboolean glx_is_initialized = FALSE;
41 static gboolean glx_fbconfig_supported = FALSE;
42 static gboolean glx_pbuffer_supported = FALSE;
43 static GLuint glx_pbuffer_texture = 0;
45 /* Prototypes for pbuffer support methods */
46 static void glx_pbuffer_init( display_driver_t driver );
47 static render_buffer_t glx_pbuffer_create_render_buffer( uint32_t width, uint32_t height, GLuint tex_id );
48 static void glx_pbuffer_destroy_render_buffer( render_buffer_t buffer );
49 static gboolean glx_pbuffer_set_render_target( render_buffer_t buffer );
50 static void glx_pbuffer_finish_render( render_buffer_t buffer );
51 static void glx_pbuffer_display_render_buffer( render_buffer_t buffer );
52 static void glx_pbuffer_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer );
53 static void glx_pbuffer_display_blank( uint32_t colour );
54 static gboolean glx_pbuffer_read_render_buffer( unsigned char *target, render_buffer_t buffer, int rowstride, int format );
57 * Test if a specific extension is supported. From opengl.org
58 * @param extension extension name to check for
59 * @return TRUE if supported, otherwise FALSE.
61 gboolean isServerGLXExtensionSupported( Display *display, int screen,
62 const char *extension )
64 const char *extensions = NULL;
66 char *where, *terminator;
68 /* Extension names should not have spaces. */
69 where = strchr(extension, ' ');
70 if (where || *extension == '\0')
72 extensions = glXQueryServerString(display, screen, GLX_EXTENSIONS);
75 where = strstr((const char *) start, extension);
78 terminator = where + strlen(extension);
79 if (where == start || *(where - 1) == ' ')
80 if (*terminator == ' ' || *terminator == '\0')
87 gboolean video_glx_init( Display *display, int screen )
91 if( glx_is_initialized ) {
95 Bool result = glXQueryVersion( display, &major, &minor );
96 if( result != False ) {
97 glx_version = (major*100) + minor;
100 glx_fbconfig_supported = (glx_version >= 103 ||
101 isServerGLXExtensionSupported(display, screen,
102 "GLX_SGIX_fbconfig") );
103 glx_pbuffer_supported = (glx_version >= 103 ||
104 isServerGLXExtensionSupported(display, screen,
105 "GLX_SGIX_pbuffer") );
106 if( glx_fbconfig_supported ) {
108 int fb_attribs[] = { GLX_DRAWABLE_TYPE,
109 GLX_PBUFFER_BIT|GLX_WINDOW_BIT,
110 GLX_RENDER_TYPE, GLX_RGBA_BIT,
111 GLX_DEPTH_SIZE, 24, 0 };
112 GLXFBConfig *configs = glXChooseFBConfig( display, screen,
113 fb_attribs, &nelem );
115 if( configs == NULL || nelem == 0 ) {
116 /* Try a 16-bit depth buffer and see if it helps */
118 configs = glXChooseFBConfig( display, screen, fb_attribs, &nelem );
120 WARN( "Using a 16-bit depth buffer - expect video glitches" );
124 if( configs == NULL || nelem == 0 ) {
125 /* Still didn't work. Fallback to 1.2 methods */
126 glx_fbconfig_supported = FALSE;
127 glx_pbuffer_supported = FALSE;
129 glx_fbconfig = configs[0];
130 glx_visual = glXGetVisualFromFBConfig(display, glx_fbconfig);
135 if( !glx_fbconfig_supported ) {
136 int attribs[] = { GLX_RGBA, GLX_DEPTH_SIZE, 24, 0 };
137 glx_visual = glXChooseVisual( display, screen, attribs );
138 if( glx_visual == NULL ) {
139 /* Try the 16-bit fallback here too */
141 glx_visual = glXChooseVisual( display, screen, attribs );
142 if( glx_visual != NULL ) {
143 WARN( "Using a 16-bit depth buffer - expect video glitches" );
148 if( glx_visual == NULL ) {
152 glx_is_initialized = TRUE;
156 gboolean video_glx_init_context( Display *display, Window window )
158 if( glx_fbconfig_supported ) {
159 glx_context = glXCreateNewContext( display, glx_fbconfig,
160 GLX_RGBA_TYPE, NULL, True );
161 if( glx_context == NULL ) {
162 ERROR( "Unable to create a GLX Context.");
166 if( glXMakeContextCurrent( display, window, window,
167 glx_context ) == False ) {
168 ERROR( "Unable to prepare GLX context for drawing" );
169 glXDestroyContext( display, glx_context );
173 glx_context = glXCreateContext( display, glx_visual, None, True );
174 if( glx_context == NULL ) {
175 ERROR( "Unable to create a GLX Context.");
179 if( glXMakeCurrent( display, window, glx_context ) == False ) {
180 ERROR( "Unable to prepare GLX context for drawing" );
181 glXDestroyContext( display, glx_context );
186 if( !glXIsDirect(display, glx_context) ) {
187 WARN( "Not using direct rendering - this is likely to be slow" );
190 video_x11_display = display;
191 video_x11_window = window;
196 gboolean video_glx_init_driver( display_driver_t driver )
198 if( gl_fbo_is_supported() ) { // First preference
200 } else if( glx_pbuffer_supported ) {
201 glx_pbuffer_init(driver);
203 ERROR( "Unable to create render buffers (requires either EXT_framebuffer_object or GLX 1.3+)" );
204 video_glx_shutdown();
211 void video_glx_shutdown()
213 // texcache_gl_shutdown();
214 glx_is_initialized = FALSE;
215 if( glx_context != NULL ) {
216 glXDestroyContext( video_x11_display, glx_context );
219 if( glx_visual != NULL ) {
226 XVisualInfo *video_glx_get_visual()
232 int video_glx_load_font( const gchar *font_name )
235 XFontStruct *font = XLoadQueryFont(video_x11_display, font_name );
239 lists = glGenLists(96);
240 glXUseXFont(font->fid, 32, 96, lists);
241 XFreeFont(video_x11_display, font);
246 void video_glx_swap_buffers( void )
248 glXSwapBuffers( video_x11_display, video_x11_window );
251 void video_glx_make_window_current( void )
253 glXMakeCurrent( video_x11_display, video_x11_window, glx_context );
260 * Construct the initial frame buffers and allocate ids for everything.
261 * The render handling driver methods are set to the fbo versions.
263 static void glx_pbuffer_init( display_driver_t driver )
265 glGenTextures( 1, &glx_pbuffer_texture );
266 driver->create_render_buffer = glx_pbuffer_create_render_buffer;
267 driver->destroy_render_buffer = glx_pbuffer_destroy_render_buffer;
268 driver->set_render_target = glx_pbuffer_set_render_target;
269 driver->finish_render = glx_pbuffer_finish_render;
270 driver->display_render_buffer = glx_pbuffer_display_render_buffer;
271 driver->load_frame_buffer = glx_pbuffer_load_frame_buffer;
272 driver->display_blank = glx_pbuffer_display_blank;
273 driver->read_render_buffer = glx_pbuffer_read_render_buffer;
276 void glx_pbuffer_shutdown()
278 glDeleteTextures( 1, &glx_pbuffer_texture );
281 static render_buffer_t glx_pbuffer_create_render_buffer( uint32_t width, uint32_t height, GLuint tex_id )
283 int attribs[] = { GLX_PBUFFER_WIDTH, width, GLX_PBUFFER_HEIGHT, height,
284 GLX_PRESERVED_CONTENTS, True, 0 };
285 GLXPbuffer pb = glXCreatePbuffer( video_x11_display, glx_fbconfig, attribs );
286 if( pb == (GLXPbuffer)NULL ) {
287 ERROR( "Unable to create pbuffer" );
290 render_buffer_t buffer = calloc( sizeof(struct render_buffer), 1 );
291 buffer->width = width;
292 buffer->height = height;
294 buffer->tex_id = tex_id;
298 static void glx_pbuffer_destroy_render_buffer( render_buffer_t buffer )
300 glXDestroyPbuffer( video_x11_display, (GLXPbuffer)buffer->buf_id );
305 static gboolean glx_pbuffer_set_render_target( render_buffer_t buffer )
308 if( glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context ) == False ) {
309 ERROR( "Make context current (pbuffer) failed!" );
311 /* setup the gl context */
312 glViewport( 0, 0, buffer->width, buffer->height );
313 glDrawBuffer(GL_FRONT);
318 static void glx_pbuffer_finish_render( render_buffer_t buffer )
321 if( buffer->tex_id != 0 ) {
322 // The pbuffer should already be the current context, but just in case...
323 glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context );
324 glBindTexture( GL_TEXTURE_RECTANGLE_ARB, buffer->tex_id );
325 glCopyTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, 0, 0, buffer->width, buffer->height, 0 );
331 * Render the texture holding the given buffer to the front window
334 static void glx_pbuffer_display_render_buffer( render_buffer_t buffer )
337 glReadBuffer( GL_FRONT );
338 glDrawBuffer( GL_FRONT );
339 glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context );
340 glBindTexture( GL_TEXTURE_RECTANGLE_ARB, glx_pbuffer_texture );
341 glCopyTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, 0, 0, buffer->width, buffer->height, 0 );
342 video_glx_make_window_current();
343 gl_texture_window( buffer->width, buffer->height, glx_pbuffer_texture, buffer->inverted );
346 static void glx_pbuffer_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer )
349 glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context );
350 GLenum type = colour_formats[frame->colour_format].type;
351 GLenum format = colour_formats[frame->colour_format].format;
352 int bpp = colour_formats[frame->colour_format].bpp;
353 int rowstride = (frame->rowstride / bpp) - frame->width;
356 glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
357 glRasterPos2f(0.375, frame->height-0.375);
358 glPixelZoom( 1.0, 1.0 );
359 glDrawPixels( frame->width, frame->height, format, type, frame->data );
363 static void glx_pbuffer_display_blank( uint32_t colour )
366 video_glx_make_window_current();
367 gl_display_blank( colour );
370 static gboolean glx_pbuffer_read_render_buffer( unsigned char *target, render_buffer_t buffer,
371 int rowstride, int format )
373 glXMakeCurrent( video_x11_display, (GLXDrawable)buffer->buf_id, glx_context );
374 glReadBuffer( GL_FRONT );
375 return gl_read_render_buffer( target, buffer, rowstride, format );
.