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lxdream.org :: lxdream/src/drivers/video_glx.c
lxdream 0.9.1
released Jun 29
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filename src/drivers/video_glx.c
changeset 806:6ef1ce4a9dbc
prev805:b355f7b3ff2e
next863:a5e5310061e2
author nkeynes
date Fri Aug 08 00:17:57 2008 +0000 (13 years ago)
permissions -rw-r--r--
last change Fix minor compile warnings
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     1 /**
     2  * $Id$
     3  *
     4  * Shared functions for all X11-based display drivers.
     5  *
     6  * Copyright (c) 2005 Nathan Keynes.
     7  *
     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.
    12  *
    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.
    17  */
    19 #include <stdlib.h>
    20 #include <string.h>
    21 #include "display.h"
    22 #include <X11/Xlib.h>
    23 #include <GL/glx.h>
    24 #include "pvr2/pvr2.h"
    25 #include "pvr2/glutil.h"
    26 #include "drivers/video_glx.h"
    27 #include "drivers/video_gl.h"
    29 /**
    30  * General X11 parameters. The front-end driver is expected to set this up
    31  * by calling video_glx_init after initializing itself.
    32  */
    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 );
    56 /**
    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.
    60  */
    61 gboolean isServerGLXExtensionSupported( Display *display, int screen, 
    62                                         const char *extension )
    63 {
    64     const char *extensions = NULL;
    65     const char *start;
    66     char *where, *terminator;
    68     /* Extension names should not have spaces. */
    69     where = strchr(extension, ' ');
    70     if (where || *extension == '\0')
    71         return 0;
    72     extensions = glXQueryServerString(display, screen, GLX_EXTENSIONS);
    73     start = extensions;
    74     for (;;) {
    75         where = strstr((const char *) start, extension);
    76         if (!where)
    77             break;
    78         terminator = where + strlen(extension);
    79         if (where == start || *(where - 1) == ' ')
    80             if (*terminator == ' ' || *terminator == '\0')
    81                 return TRUE;
    82         start = terminator;
    83     }
    84     return FALSE;
    85 }
    87 gboolean video_glx_init( Display *display, int screen )
    88 {
    89     int major, minor;
    91     if( glx_is_initialized ) {
    92         return TRUE;
    93     }
    95     Bool result = glXQueryVersion( display, &major, &minor );
    96     if( result != False ) {
    97         glx_version = (major*100) + minor;
    98     }
   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 ) {
   107         int nelem;
   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 */
   117             fb_attribs[5] = 16;
   118             configs = glXChooseFBConfig( display, screen, fb_attribs, &nelem );
   119             if( nelem > 0 ) {
   120                 WARN( "Using a 16-bit depth buffer - expect video glitches" );
   121             }
   123         }
   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;
   128         } else {
   129             glx_fbconfig = configs[0];
   130             glx_visual = glXGetVisualFromFBConfig(display, glx_fbconfig);
   131             XFree(configs);
   132         }
   133     }
   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 */
   140             attribs[2] = 16;
   141             glx_visual = glXChooseVisual( display, screen, attribs );
   142             if( glx_visual != NULL ) {
   143                 WARN( "Using a 16-bit depth buffer - expect video glitches" );
   144             }
   145         }
   146     }
   148     if( glx_visual == NULL ) {
   149         return FALSE;
   150     }
   152     glx_is_initialized = TRUE;
   153     return TRUE;
   154 }
   156 gboolean video_glx_init_context( Display *display, Window window )
   157 {
   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.");
   163             return FALSE;
   164         }
   166         if( glXMakeContextCurrent( display, window, window, 
   167                 glx_context ) == False ) {
   168             ERROR( "Unable to prepare GLX context for drawing" );
   169             glXDestroyContext( display, glx_context );
   170             return FALSE;
   171         }
   172     } else {
   173         glx_context = glXCreateContext( display, glx_visual, None, True );
   174         if( glx_context == NULL ) {
   175             ERROR( "Unable to create a GLX Context.");
   176             return FALSE;
   177         }
   179         if( glXMakeCurrent( display, window, glx_context ) == False ) {
   180             ERROR( "Unable to prepare GLX context for drawing" );
   181             glXDestroyContext( display, glx_context );
   182             return FALSE;
   183         }
   184     }
   186     if( !glXIsDirect(display, glx_context) ) {
   187         WARN( "Not using direct rendering - this is likely to be slow" );
   188     }
   190     video_x11_display = display;
   191     video_x11_window = window;
   193     return TRUE;
   194 }
   196 gboolean video_glx_init_driver( display_driver_t driver )
   197 {
   198     if( gl_fbo_is_supported() ) { // First preference
   199         gl_fbo_init(driver);
   200     } else if( glx_pbuffer_supported ) {
   201         glx_pbuffer_init(driver);
   202     } else {
   203         ERROR( "Unable to create render buffers (requires either EXT_framebuffer_object or GLX 1.3+)" );
   204         video_glx_shutdown();
   205         return FALSE;
   206     }
   207     return TRUE;
   208 }
   211 void video_glx_shutdown()
   212 {
   213     //    texcache_gl_shutdown();
   214     glx_is_initialized = FALSE;
   215     if( glx_context != NULL ) {
   216         glXDestroyContext( video_x11_display, glx_context );
   217         glx_context = NULL;
   218     }
   219     if( glx_visual != NULL ) {
   220         XFree(glx_visual);
   221         glx_visual = NULL;
   222     }
   223 }
   226 XVisualInfo *video_glx_get_visual()
   227 {
   228     return glx_visual;
   229 }
   232 int video_glx_load_font( const gchar *font_name )
   233 {
   234     int lists;
   235     XFontStruct *font = XLoadQueryFont(video_x11_display, font_name );
   236     if (font == NULL)
   237         return -1;
   239     lists = glGenLists(96);
   240     glXUseXFont(font->fid, 32, 96, lists);
   241     XFreeFont(video_x11_display, font);
   242     return lists;
   243 }
   246 void video_glx_swap_buffers( void )
   247 {
   248     glXSwapBuffers( video_x11_display, video_x11_window );
   249 }
   251 void video_glx_make_window_current( void )
   252 {
   253     glXMakeCurrent( video_x11_display, video_x11_window, glx_context );
   254 }
   257 // Pbuffer support
   259 /**
   260  * Construct the initial frame buffers and allocate ids for everything.
   261  * The render handling driver methods are set to the fbo versions.
   262  */
   263 static void glx_pbuffer_init( display_driver_t driver ) 
   264 {
   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;
   274 }
   276 void glx_pbuffer_shutdown()
   277 {
   278     glDeleteTextures( 1, &glx_pbuffer_texture );
   279 }
   281 static render_buffer_t glx_pbuffer_create_render_buffer( uint32_t width, uint32_t height, GLuint tex_id )
   282 {
   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" );
   288         return NULL;
   289     }
   290     render_buffer_t buffer = calloc( sizeof(struct render_buffer), 1 );
   291     buffer->width = width;
   292     buffer->height = height;
   293     buffer->buf_id = pb;
   294     buffer->tex_id = tex_id;
   295     return buffer;
   296 }
   298 static void glx_pbuffer_destroy_render_buffer( render_buffer_t buffer )
   299 {
   300     glXDestroyPbuffer( video_x11_display, (GLXPbuffer)buffer->buf_id );
   301     buffer->buf_id = 0;
   302     free( buffer );
   303 }
   305 static gboolean glx_pbuffer_set_render_target( render_buffer_t buffer )
   306 {
   307     glFinish();
   308     if( glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context ) == False ) {
   309         ERROR( "Make context current (pbuffer) failed!" );
   310     }
   311     /* setup the gl context */
   312     glViewport( 0, 0, buffer->width, buffer->height );
   313     glDrawBuffer(GL_FRONT);
   315     return TRUE;
   316 }
   318 static void glx_pbuffer_finish_render( render_buffer_t buffer )
   319 {
   320     glFinish();
   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 );
   326     }
   327 }
   330 /**
   331  * Render the texture holding the given buffer to the front window
   332  * buffer.
   333  */
   334 static void glx_pbuffer_display_render_buffer( render_buffer_t buffer )
   335 {
   336     glFinish();
   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 );
   344 }
   346 static void glx_pbuffer_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer )
   347 {
   348     glFinish();
   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;
   355     gl_reset_state();
   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 );
   360     glFlush();
   361 }
   363 static void glx_pbuffer_display_blank( uint32_t colour )
   364 {
   365     glFinish();
   366     video_glx_make_window_current();
   367     gl_display_blank( colour );
   368 }
   370 static gboolean glx_pbuffer_read_render_buffer( unsigned char *target, render_buffer_t buffer, 
   371                                                 int rowstride, int format )
   372 {
   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 );
   376 }
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