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 )
90 int glx_major, glx_minor, glx_error;
92 if( glx_is_initialized ) {
96 Bool result = XQueryExtension( display, "GLX", &glx_major, &glx_minor, &glx_error ) &&
97 glXQueryVersion( display, &major, &minor );
98 if( result == False ) {
99 ERROR( "GLX not supported on display" );
103 glx_version = (major*100) + minor;
106 /* fbconfig is broken on at least the 10.5 GLX implementation */
107 glx_fbconfig_supported = FALSE;
109 glx_fbconfig_supported = (glx_version >= 103 ||
110 isServerGLXExtensionSupported(display, screen,
111 "GLX_SGIX_fbconfig") );
113 glx_pbuffer_supported = (glx_version >= 103 ||
114 isServerGLXExtensionSupported(display, screen,
115 "GLX_SGIX_pbuffer") );
116 // glx_fbconfig_supported = FALSE;
117 if( glx_fbconfig_supported ) {
119 int fb_attribs[] = { GLX_DRAWABLE_TYPE,
120 GLX_PBUFFER_BIT|GLX_WINDOW_BIT,
121 GLX_RENDER_TYPE, GLX_RGBA_BIT,
123 GLX_STENCIL_SIZE, 8, 0 };
124 GLXFBConfig *configs = glXChooseFBConfig( display, screen,
125 fb_attribs, &nelem );
127 if( configs == NULL || nelem == 0 ) {
128 /* Try a 16-bit depth buffer and see if it helps */
130 configs = glXChooseFBConfig( display, screen, fb_attribs, &nelem );
132 WARN( "Using a 16-bit depth buffer - expect video glitches" );
136 if( configs == NULL || nelem == 0 ) {
137 /* Still didn't work. Fallback to 1.2 methods */
138 glx_fbconfig_supported = FALSE;
139 glx_pbuffer_supported = FALSE;
141 glx_fbconfig = configs[0];
142 glx_visual = glXGetVisualFromFBConfig(display, glx_fbconfig);
147 if( !glx_fbconfig_supported ) {
148 int attribs[] = { GLX_RGBA, GLX_DEPTH_SIZE, 24, GLX_STENCIL_SIZE, 8, 0 };
149 glx_visual = glXChooseVisual( display, screen, attribs );
150 if( glx_visual == NULL ) {
151 /* Try the 16-bit fallback here too */
153 glx_visual = glXChooseVisual( display, screen, attribs );
154 if( glx_visual != NULL ) {
155 WARN( "Using a 16-bit depth buffer - expect video glitches" );
160 if( glx_visual == NULL ) {
164 glx_is_initialized = TRUE;
168 gboolean video_glx_init_context( Display *display, Window window )
170 if( glx_fbconfig_supported ) {
171 glx_context = glXCreateNewContext( display, glx_fbconfig,
172 GLX_RGBA_TYPE, NULL, True );
173 if( glx_context == NULL ) {
174 ERROR( "Unable to create a GLX Context.");
178 if( glXMakeCurrent( display, window,
179 glx_context ) == False ) {
180 ERROR( "Unable to prepare GLX context for drawing" );
181 glXDestroyContext( display, glx_context );
185 glx_context = glXCreateContext( display, glx_visual, None, True );
186 if( glx_context == NULL ) {
187 ERROR( "Unable to create a GLX Context.");
191 if( glXMakeCurrent( display, window, glx_context ) == False ) {
192 ERROR( "Unable to prepare GLX context for drawing" );
193 glXDestroyContext( display, glx_context );
198 if( !glXIsDirect(display, glx_context) ) {
199 WARN( "Not using direct rendering - this is likely to be slow" );
202 video_x11_display = display;
203 video_x11_window = window;
208 gboolean video_glx_init_driver( display_driver_t driver )
210 if( gl_fbo_is_supported() ) { // First preference
212 } else if( glx_pbuffer_supported ) {
213 glx_pbuffer_init(driver);
215 ERROR( "Unable to create render buffers (requires either EXT_framebuffer_object or GLX 1.3+)" );
216 video_glx_shutdown();
223 void video_glx_shutdown()
225 // texcache_gl_shutdown();
226 glx_is_initialized = FALSE;
227 if( glx_context != NULL ) {
228 glXDestroyContext( video_x11_display, glx_context );
231 if( glx_visual != NULL ) {
238 XVisualInfo *video_glx_get_visual()
244 int video_glx_load_font( const gchar *font_name )
247 XFontStruct *font = XLoadQueryFont(video_x11_display, font_name );
251 lists = glGenLists(96);
252 glXUseXFont(font->fid, 32, 96, lists);
253 XFreeFont(video_x11_display, font);
258 void video_glx_swap_buffers( void )
260 glXSwapBuffers( video_x11_display, video_x11_window );
263 void video_glx_make_window_current( void )
265 glXMakeCurrent( video_x11_display, video_x11_window, glx_context );
272 * Construct the initial frame buffers and allocate ids for everything.
273 * The render handling driver methods are set to the fbo versions.
275 static void glx_pbuffer_init( display_driver_t driver )
277 GLint stencil_bits = 0;
279 /* Retrieve the number of stencil bits */
280 glGetIntegerv( GL_STENCIL_BITS, &stencil_bits );
281 driver->capabilities.stencil_bits = stencil_bits;
283 glGenTextures( 1, &glx_pbuffer_texture );
284 driver->create_render_buffer = glx_pbuffer_create_render_buffer;
285 driver->destroy_render_buffer = glx_pbuffer_destroy_render_buffer;
286 driver->set_render_target = glx_pbuffer_set_render_target;
287 driver->finish_render = glx_pbuffer_finish_render;
288 driver->display_render_buffer = glx_pbuffer_display_render_buffer;
289 driver->load_frame_buffer = glx_pbuffer_load_frame_buffer;
290 driver->display_blank = glx_pbuffer_display_blank;
291 driver->read_render_buffer = glx_pbuffer_read_render_buffer;
294 void glx_pbuffer_shutdown()
296 glDeleteTextures( 1, &glx_pbuffer_texture );
299 static render_buffer_t glx_pbuffer_create_render_buffer( uint32_t width, uint32_t height, GLuint tex_id )
301 int attribs[] = { GLX_PBUFFER_WIDTH, width, GLX_PBUFFER_HEIGHT, height,
302 GLX_PRESERVED_CONTENTS, True, 0 };
303 GLXPbuffer pb = glXCreatePbuffer( video_x11_display, glx_fbconfig, attribs );
304 if( pb == (GLXPbuffer)NULL ) {
305 ERROR( "Unable to create pbuffer" );
308 render_buffer_t buffer = calloc( sizeof(struct render_buffer), 1 );
309 buffer->width = width;
310 buffer->height = height;
312 buffer->tex_id = tex_id;
316 static void glx_pbuffer_destroy_render_buffer( render_buffer_t buffer )
318 glXDestroyPbuffer( video_x11_display, (GLXPbuffer)buffer->buf_id );
323 static gboolean glx_pbuffer_set_render_target( render_buffer_t buffer )
326 if( glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context ) == False ) {
327 ERROR( "Make context current (pbuffer) failed!" );
329 /* setup the gl context */
330 glViewport( 0, 0, buffer->width, buffer->height );
331 glDrawBuffer(GL_FRONT);
336 static void glx_pbuffer_finish_render( render_buffer_t buffer )
339 if( buffer->tex_id != 0 ) {
340 // The pbuffer should already be the current context, but just in case...
341 glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context );
342 glBindTexture( GL_TEXTURE_RECTANGLE_ARB, buffer->tex_id );
343 glCopyTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, 0, 0, buffer->width, buffer->height, 0 );
349 * Render the texture holding the given buffer to the front window
352 static void glx_pbuffer_display_render_buffer( render_buffer_t buffer )
355 glReadBuffer( GL_FRONT );
356 glDrawBuffer( GL_FRONT );
357 glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context );
358 glBindTexture( GL_TEXTURE_RECTANGLE_ARB, glx_pbuffer_texture );
359 glCopyTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, 0, 0, buffer->width, buffer->height, 0 );
360 video_glx_make_window_current();
361 gl_texture_window( buffer->width, buffer->height, glx_pbuffer_texture, buffer->inverted );
364 static void glx_pbuffer_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer )
367 glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context );
368 GLenum type = colour_formats[frame->colour_format].type;
369 GLenum format = colour_formats[frame->colour_format].format;
370 int bpp = colour_formats[frame->colour_format].bpp;
371 int rowstride = (frame->rowstride / bpp) - frame->width;
374 glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
375 glRasterPos2f(0.375, frame->height-0.375);
376 glPixelZoom( 1.0, 1.0 );
377 glDrawPixels( frame->width, frame->height, format, type, frame->data );
381 static void glx_pbuffer_display_blank( uint32_t colour )
384 video_glx_make_window_current();
385 gl_display_blank( colour );
388 static gboolean glx_pbuffer_read_render_buffer( unsigned char *target, render_buffer_t buffer,
389 int rowstride, int format )
391 glXMakeCurrent( video_x11_display, (GLXDrawable)buffer->buf_id, glx_context );
392 glReadBuffer( GL_FRONT );
393 return gl_read_render_buffer( target, buffer, rowstride, format );
.