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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 703:585c66692be7
prev681:1755a126b109
next736:a02d1475ccfd
author nkeynes
date Sun Jun 22 21:27:28 2008 +0000 (13 years ago)
permissions -rw-r--r--
last change Remove forcible fbconfig disable (misplaced testing code)
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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 <string.h>
    20 #include "display.h"
    21 #include <X11/Xlib.h>
    22 #include <GL/glx.h>
    23 #include <string.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 );
    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_display_render_buffer( render_buffer_t buffer );
    51 static void glx_pbuffer_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer );
    52 static void glx_pbuffer_display_blank( uint32_t colour );
    53 static gboolean glx_pbuffer_read_render_buffer( unsigned char *target, render_buffer_t buffer, int rowstride, int format );
    55 /**
    56  * Test if a specific extension is supported. From opengl.org
    57  * @param extension extension name to check for
    58  * @return TRUE if supported, otherwise FALSE.
    59  */
    60 gboolean isServerGLXExtensionSupported( Display *display, int screen, 
    61 					const char *extension )
    62 {
    63     const char *extensions = NULL;
    64     const char *start;
    65     char *where, *terminator;
    67     /* Extension names should not have spaces. */
    68     where = strchr(extension, ' ');
    69     if (where || *extension == '\0')
    70 	return 0;
    71     extensions = glXQueryServerString(display, screen, GLX_EXTENSIONS);
    72     start = extensions;
    73     for (;;) {
    74 	where = strstr((const char *) start, extension);
    75 	if (!where)
    76 	    break;
    77 	terminator = where + strlen(extension);
    78 	if (where == start || *(where - 1) == ' ')
    79 	    if (*terminator == ' ' || *terminator == '\0')
    80 		return TRUE;
    81 	start = terminator;
    82     }
    83     return FALSE;
    84 }
    86 gboolean video_glx_init( Display *display, int screen )
    87 {
    88     int major, minor;
    90     if( glx_is_initialized ) {
    91         return TRUE;
    92     }
    94     Bool result = glXQueryVersion( display, &major, &minor );
    95     if( result != False ) {
    96         glx_version = (major*100) + minor;
    97     }
    99     glx_fbconfig_supported = (glx_version >= 103 || 
   100 			      isServerGLXExtensionSupported(display, screen,
   101 						      "GLX_SGIX_fbconfig") );
   102     glx_pbuffer_supported = (glx_version >= 103 ||
   103 			     isServerGLXExtensionSupported(display, screen,
   104 						     "GLX_SGIX_pbuffer") );
   105     if( glx_fbconfig_supported ) {
   106 	int nelem;
   107         int fb_attribs[] = { GLX_DRAWABLE_TYPE, 
   108 			     GLX_PBUFFER_BIT|GLX_WINDOW_BIT, 
   109 			     GLX_RENDER_TYPE, GLX_RGBA_BIT, 
   110 			     GLX_DEPTH_SIZE, 24, 0 };
   111 	GLXFBConfig *configs = glXChooseFBConfig( display, screen, 
   112 						  fb_attribs, &nelem );
   114 	if( configs == NULL || nelem == 0 ) {
   115 	    /* Try a 16-bit depth buffer and see if it helps */
   116 	    fb_attribs[5] = 16;
   117 	    configs = glXChooseFBConfig( display, screen, fb_attribs, &nelem );
   118 	    if( nelem > 0 ) {
   119                 WARN( "Using a 16-bit depth buffer - expect video glitches" );
   120             }
   122         }
   123         if( configs == NULL || nelem == 0 ) {
   124 	    /* Still didn't work. Fallback to 1.2 methods */
   125 	    glx_fbconfig_supported = FALSE;
   126 	    glx_pbuffer_supported = FALSE;
   127 	} else {
   128 	    glx_fbconfig = configs[0];
   129 	    glx_visual = glXGetVisualFromFBConfig(display, glx_fbconfig);
   130 	    XFree(configs);
   131 	}
   132     }
   134     if( !glx_fbconfig_supported ) {
   135         int attribs[] = { GLX_RGBA, GLX_DEPTH_SIZE, 24, 0 };
   136 	glx_visual = glXChooseVisual( display, screen, attribs );
   137         if( glx_visual == NULL ) {
   138             /* Try the 16-bit fallback here too */
   139             attribs[2] = 16;
   140             glx_visual = glXChooseVisual( display, screen, attribs );
   141             if( glx_visual != NULL ) {
   142                 WARN( "Using a 16-bit depth buffer - expect video glitches" );
   143             }
   144         }
   145     }
   147     if( glx_visual == NULL ) {
   148         return FALSE;
   149     }
   151     glx_is_initialized = TRUE;
   152     return TRUE;
   153 }
   155 gboolean video_glx_init_context( Display *display, Window window )
   156 {
   157     if( glx_fbconfig_supported ) {
   158         glx_context = glXCreateNewContext( display, glx_fbconfig, 
   159 					   GLX_RGBA_TYPE, NULL, True );
   160 	if( glx_context == NULL ) {
   161 	    ERROR( "Unable to create a GLX Context.");
   162 	    return FALSE;
   163 	}
   165 	if( glXMakeContextCurrent( display, window, window, 
   166 				   glx_context ) == False ) {
   167 	    ERROR( "Unable to prepare GLX context for drawing" );
   168 	    glXDestroyContext( display, glx_context );
   169 	    return FALSE;
   170 	}
   171     } else {
   172         glx_context = glXCreateContext( display, glx_visual, None, True );
   173 	if( glx_context == NULL ) {
   174 	    ERROR( "Unable to create a GLX Context.");
   175 	    return FALSE;
   176 	}
   178 	if( glXMakeCurrent( display, window, glx_context ) == False ) {
   179 	    ERROR( "Unable to prepare GLX context for drawing" );
   180 	    glXDestroyContext( display, glx_context );
   181 	    return FALSE;
   182 	}
   183     }
   185     if( !glXIsDirect(display, glx_context) ) {
   186     	WARN( "Not using direct rendering - this is likely to be slow" );
   187     }
   189     video_x11_display = display;
   190     video_x11_window = window;
   192     return TRUE;
   193 }
   195 gboolean video_glx_init_driver( display_driver_t driver )
   196 {
   197     if( gl_fbo_is_supported() ) { // First preference
   198 	gl_fbo_init(driver);
   199     } else if( glx_pbuffer_supported ) {
   200 	glx_pbuffer_init(driver);
   201     } else {
   202         ERROR( "Unable to create render buffers (requires either EXT_framebuffer_object or GLX 1.3+)" );
   203         video_glx_shutdown();
   204 	return FALSE;
   205     }
   206     return TRUE;
   207 }
   210 void video_glx_shutdown()
   211 {
   212   //    texcache_gl_shutdown();
   213     glx_is_initialized = FALSE;
   214     if( glx_context != NULL ) {
   215         glXDestroyContext( video_x11_display, glx_context );
   216 	glx_context = NULL;
   217     }
   218     if( glx_visual != NULL ) {
   219         XFree(glx_visual);
   220 	glx_visual = NULL;
   221     }
   222 }
   225 XVisualInfo *video_glx_get_visual()
   226 {
   227     return glx_visual;
   228 }
   231 int video_glx_load_font( const gchar *font_name )
   232 {
   233     int lists;
   234     XFontStruct *font = XLoadQueryFont(video_x11_display, font_name );
   235     if (font == NULL)
   236 	return -1;
   238     lists = glGenLists(96);
   239     glXUseXFont(font->fid, 32, 96, lists);
   240     XFreeFont(video_x11_display, font);
   241     return lists;
   242 }
   245 void video_glx_swap_buffers( void )
   246 {
   247     glXSwapBuffers( video_x11_display, video_x11_window );
   248 }
   250 void video_glx_make_window_current( void )
   251 {
   252     glXMakeCurrent( video_x11_display, video_x11_window, glx_context );
   253 }
   256 // Pbuffer support
   258 /**
   259  * Construct the initial frame buffers and allocate ids for everything.
   260  * The render handling driver methods are set to the fbo versions.
   261  */
   262 static void glx_pbuffer_init( display_driver_t driver ) 
   263 {
   264     glGenTextures( 1, &glx_pbuffer_texture );
   265     driver->create_render_buffer = glx_pbuffer_create_render_buffer;
   266     driver->destroy_render_buffer = glx_pbuffer_destroy_render_buffer;
   267     driver->set_render_target = glx_pbuffer_set_render_target;
   268     driver->display_render_buffer = glx_pbuffer_display_render_buffer;
   269     driver->load_frame_buffer = glx_pbuffer_load_frame_buffer;
   270     driver->display_blank = glx_pbuffer_display_blank;
   271     driver->read_render_buffer = glx_pbuffer_read_render_buffer;
   272 }
   274 void glx_pbuffer_shutdown()
   275 {
   276     glDeleteTextures( 1, &glx_pbuffer_texture );
   277 }
   279 static render_buffer_t glx_pbuffer_create_render_buffer( uint32_t width, uint32_t height )
   280 {
   281     int attribs[] = { GLX_PBUFFER_WIDTH, width, GLX_PBUFFER_HEIGHT, height,
   282                       GLX_PRESERVED_CONTENTS, True, 0 };
   283     GLXPbuffer pb = glXCreatePbuffer( video_x11_display, glx_fbconfig, attribs );
   284     if( pb == (GLXPbuffer)NULL ) {
   285 	ERROR( "Unable to create pbuffer" );
   286 	return NULL;
   287     }
   288     render_buffer_t buffer = calloc( sizeof(struct render_buffer), 1 );
   289     buffer->width = width;
   290     buffer->height = height;
   291     buffer->buf_id = pb;
   292     return buffer;
   293 }
   295 static void glx_pbuffer_destroy_render_buffer( render_buffer_t buffer )
   296 {
   297     glXDestroyPbuffer( video_x11_display, (GLXPbuffer)buffer->buf_id );
   298     buffer->buf_id = 0;
   299     free( buffer );
   300 }
   302 static gboolean glx_pbuffer_set_render_target( render_buffer_t buffer )
   303 {
   304     glFinish();
   305     if( glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context ) == False ) {
   306 	ERROR( "Make context current (pbuffer) failed!" );
   307     }
   308     /* setup the gl context */
   309     glViewport( 0, 0, buffer->width, buffer->height );
   310     glDrawBuffer(GL_FRONT);
   312     return TRUE;
   313 }
   315 /**
   316  * Render the texture holding the given buffer to the front window
   317  * buffer.
   318  */
   319 static void glx_pbuffer_display_render_buffer( render_buffer_t buffer )
   320 {
   321     glFinish();
   322     glReadBuffer( GL_FRONT );
   323     glDrawBuffer( GL_FRONT );
   324     glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context );
   325     glBindTexture( GL_TEXTURE_RECTANGLE_ARB, glx_pbuffer_texture );
   326     glCopyTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, 0, 0, buffer->width, buffer->height, 0 );
   327     video_glx_make_window_current();
   328     gl_texture_window( buffer->width, buffer->height, glx_pbuffer_texture, buffer->inverted );
   329 }
   331 static void glx_pbuffer_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer )
   332 {
   333     glFinish();
   334     glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context );
   335     GLenum type = colour_formats[frame->colour_format].type;
   336     GLenum format = colour_formats[frame->colour_format].format;
   337     int bpp = colour_formats[frame->colour_format].bpp;
   338     int rowstride = (frame->rowstride / bpp) - frame->width;
   340     gl_reset_state();
   341     glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
   342     glRasterPos2f(0.375, frame->height-0.375);
   343     glPixelZoom( 1.0, 1.0 );
   344     glDrawPixels( frame->width, frame->height, format, type, frame->data );
   345     glFlush();
   346 }
   348 static void glx_pbuffer_display_blank( uint32_t colour )
   349 {
   350     glFinish();
   351     video_glx_make_window_current();
   352     gl_display_blank( colour );
   353 }
   355 static gboolean glx_pbuffer_read_render_buffer( unsigned char *target, render_buffer_t buffer, 
   356 					       int rowstride, int format )
   357 {
   358     glXMakeCurrent( video_x11_display, (GLXDrawable)buffer->buf_id, glx_context );
   359     glReadBuffer( GL_FRONT );
   360     return gl_read_render_buffer( target, buffer, rowstride, format );
   361 }
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