nkeynes@545: /**
nkeynes@586:  * $Id$
nkeynes@545:  *
nkeynes@545:  * Shared functions for all X11-based display drivers.
nkeynes@545:  *
nkeynes@545:  * Copyright (c) 2005 Nathan Keynes.
nkeynes@545:  *
nkeynes@545:  * This program is free software; you can redistribute it and/or modify
nkeynes@545:  * it under the terms of the GNU General Public License as published by
nkeynes@545:  * the Free Software Foundation; either version 2 of the License, or
nkeynes@545:  * (at your option) any later version.
nkeynes@545:  *
nkeynes@545:  * This program is distributed in the hope that it will be useful,
nkeynes@545:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
nkeynes@545:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
nkeynes@545:  * GNU General Public License for more details.
nkeynes@545:  */
nkeynes@545: 
nkeynes@653: #include <string.h>
nkeynes@586: #include "display.h"
nkeynes@545: #include <X11/Xlib.h>
nkeynes@545: #include <GL/glx.h>
nkeynes@676: #include <string.h>
nkeynes@653: #include "pvr2/pvr2.h"
nkeynes@653: #include "pvr2/glutil.h"
nkeynes@545: #include "drivers/video_glx.h"
nkeynes@653: #include "drivers/video_gl.h"
nkeynes@545: 
nkeynes@545: /**
nkeynes@545:  * General X11 parameters. The front-end driver is expected to set this up
nkeynes@545:  * by calling video_glx_init after initializing itself.
nkeynes@545:  */
nkeynes@545: Display *video_x11_display = NULL;
nkeynes@545: Window video_x11_window = 0;
nkeynes@545: 
nkeynes@545: static int glx_version = 100;
nkeynes@606: static XVisualInfo *glx_visual = NULL;
nkeynes@545: static GLXFBConfig glx_fbconfig;
nkeynes@545: static GLXContext glx_context = NULL;
nkeynes@545: static gboolean glx_is_initialized = FALSE;
nkeynes@545: static gboolean glx_fbconfig_supported = FALSE;
nkeynes@545: static gboolean glx_pbuffer_supported = FALSE;
nkeynes@669: static GLuint glx_pbuffer_texture = 0; 
nkeynes@545: 
nkeynes@545: /* Prototypes for pbuffer support methods */
nkeynes@545: static void glx_pbuffer_init( display_driver_t driver );
nkeynes@545: static render_buffer_t glx_pbuffer_create_render_buffer( uint32_t width, uint32_t height );
nkeynes@545: static void glx_pbuffer_destroy_render_buffer( render_buffer_t buffer );
nkeynes@545: static gboolean glx_pbuffer_set_render_target( render_buffer_t buffer );
nkeynes@669: static void glx_pbuffer_display_render_buffer( render_buffer_t buffer );
nkeynes@545: static void glx_pbuffer_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer );
nkeynes@669: static void glx_pbuffer_display_blank( uint32_t colour );
nkeynes@545: static gboolean glx_pbuffer_read_render_buffer( unsigned char *target, render_buffer_t buffer, int rowstride, int format );
nkeynes@545: 
nkeynes@545: /**
nkeynes@545:  * Test if a specific extension is supported. From opengl.org
nkeynes@545:  * @param extension extension name to check for
nkeynes@545:  * @return TRUE if supported, otherwise FALSE.
nkeynes@545:  */
nkeynes@545: gboolean isServerGLXExtensionSupported( Display *display, int screen, 
nkeynes@736:                                         const char *extension )
nkeynes@545: {
nkeynes@545:     const char *extensions = NULL;
nkeynes@545:     const char *start;
nkeynes@545:     char *where, *terminator;
nkeynes@545: 
nkeynes@545:     /* Extension names should not have spaces. */
nkeynes@545:     where = strchr(extension, ' ');
nkeynes@545:     if (where || *extension == '\0')
nkeynes@736:         return 0;
nkeynes@545:     extensions = glXQueryServerString(display, screen, GLX_EXTENSIONS);
nkeynes@545:     start = extensions;
nkeynes@545:     for (;;) {
nkeynes@736:         where = strstr((const char *) start, extension);
nkeynes@736:         if (!where)
nkeynes@736:             break;
nkeynes@736:         terminator = where + strlen(extension);
nkeynes@736:         if (where == start || *(where - 1) == ' ')
nkeynes@736:             if (*terminator == ' ' || *terminator == '\0')
nkeynes@736:                 return TRUE;
nkeynes@736:         start = terminator;
nkeynes@545:     }
nkeynes@545:     return FALSE;
nkeynes@545: }
nkeynes@545: 
nkeynes@545: gboolean video_glx_init( Display *display, int screen )
nkeynes@545: {
nkeynes@545:     int major, minor;
nkeynes@545: 
nkeynes@545:     if( glx_is_initialized ) {
nkeynes@545:         return TRUE;
nkeynes@545:     }
nkeynes@545: 
nkeynes@545:     Bool result = glXQueryVersion( display, &major, &minor );
nkeynes@545:     if( result != False ) {
nkeynes@545:         glx_version = (major*100) + minor;
nkeynes@545:     }
nkeynes@736: 
nkeynes@545:     glx_fbconfig_supported = (glx_version >= 103 || 
nkeynes@736:             isServerGLXExtensionSupported(display, screen,
nkeynes@736:                     "GLX_SGIX_fbconfig") );
nkeynes@545:     glx_pbuffer_supported = (glx_version >= 103 ||
nkeynes@736:             isServerGLXExtensionSupported(display, screen,
nkeynes@736:                     "GLX_SGIX_pbuffer") );
nkeynes@545:     if( glx_fbconfig_supported ) {
nkeynes@736:         int nelem;
nkeynes@545:         int fb_attribs[] = { GLX_DRAWABLE_TYPE, 
nkeynes@736:                 GLX_PBUFFER_BIT|GLX_WINDOW_BIT, 
nkeynes@736:                 GLX_RENDER_TYPE, GLX_RGBA_BIT, 
nkeynes@736:                 GLX_DEPTH_SIZE, 24, 0 };
nkeynes@736:         GLXFBConfig *configs = glXChooseFBConfig( display, screen, 
nkeynes@736:                 fb_attribs, &nelem );
nkeynes@545: 
nkeynes@736:         if( configs == NULL || nelem == 0 ) {
nkeynes@736:             /* Try a 16-bit depth buffer and see if it helps */
nkeynes@736:             fb_attribs[5] = 16;
nkeynes@736:             configs = glXChooseFBConfig( display, screen, fb_attribs, &nelem );
nkeynes@736:             if( nelem > 0 ) {
nkeynes@676:                 WARN( "Using a 16-bit depth buffer - expect video glitches" );
nkeynes@676:             }
nkeynes@676: 
nkeynes@676:         }
nkeynes@676:         if( configs == NULL || nelem == 0 ) {
nkeynes@736:             /* Still didn't work. Fallback to 1.2 methods */
nkeynes@736:             glx_fbconfig_supported = FALSE;
nkeynes@736:             glx_pbuffer_supported = FALSE;
nkeynes@736:         } else {
nkeynes@736:             glx_fbconfig = configs[0];
nkeynes@736:             glx_visual = glXGetVisualFromFBConfig(display, glx_fbconfig);
nkeynes@736:             XFree(configs);
nkeynes@736:         }
nkeynes@545:     }
nkeynes@545: 
nkeynes@545:     if( !glx_fbconfig_supported ) {
nkeynes@545:         int attribs[] = { GLX_RGBA, GLX_DEPTH_SIZE, 24, 0 };
nkeynes@736:         glx_visual = glXChooseVisual( display, screen, attribs );
nkeynes@676:         if( glx_visual == NULL ) {
nkeynes@676:             /* Try the 16-bit fallback here too */
nkeynes@676:             attribs[2] = 16;
nkeynes@676:             glx_visual = glXChooseVisual( display, screen, attribs );
nkeynes@676:             if( glx_visual != NULL ) {
nkeynes@676:                 WARN( "Using a 16-bit depth buffer - expect video glitches" );
nkeynes@676:             }
nkeynes@676:         }
nkeynes@545:     }
nkeynes@606: 
nkeynes@606:     if( glx_visual == NULL ) {
nkeynes@606:         return FALSE;
nkeynes@606:     }
nkeynes@606: 
nkeynes@545:     glx_is_initialized = TRUE;
nkeynes@545:     return TRUE;
nkeynes@545: }
nkeynes@545: 
nkeynes@545: gboolean video_glx_init_context( Display *display, Window window )
nkeynes@545: {
nkeynes@545:     if( glx_fbconfig_supported ) {
nkeynes@545:         glx_context = glXCreateNewContext( display, glx_fbconfig, 
nkeynes@736:                 GLX_RGBA_TYPE, NULL, True );
nkeynes@736:         if( glx_context == NULL ) {
nkeynes@736:             ERROR( "Unable to create a GLX Context.");
nkeynes@736:             return FALSE;
nkeynes@736:         }
nkeynes@545: 
nkeynes@736:         if( glXMakeContextCurrent( display, window, window, 
nkeynes@736:                 glx_context ) == False ) {
nkeynes@736:             ERROR( "Unable to prepare GLX context for drawing" );
nkeynes@736:             glXDestroyContext( display, glx_context );
nkeynes@736:             return FALSE;
nkeynes@736:         }
nkeynes@545:     } else {
nkeynes@545:         glx_context = glXCreateContext( display, glx_visual, None, True );
nkeynes@736:         if( glx_context == NULL ) {
nkeynes@736:             ERROR( "Unable to create a GLX Context.");
nkeynes@736:             return FALSE;
nkeynes@736:         }
nkeynes@736: 
nkeynes@736:         if( glXMakeCurrent( display, window, glx_context ) == False ) {
nkeynes@736:             ERROR( "Unable to prepare GLX context for drawing" );
nkeynes@736:             glXDestroyContext( display, glx_context );
nkeynes@736:             return FALSE;
nkeynes@736:         }
nkeynes@545:     }
nkeynes@545: 
nkeynes@545:     if( !glXIsDirect(display, glx_context) ) {
nkeynes@736:         WARN( "Not using direct rendering - this is likely to be slow" );
nkeynes@545:     }
nkeynes@545: 
nkeynes@545:     video_x11_display = display;
nkeynes@545:     video_x11_window = window;
nkeynes@545: 
nkeynes@545:     return TRUE;
nkeynes@545: }
nkeynes@545: 
nkeynes@545: gboolean video_glx_init_driver( display_driver_t driver )
nkeynes@545: {
nkeynes@545:     if( gl_fbo_is_supported() ) { // First preference
nkeynes@736:         gl_fbo_init(driver);
nkeynes@545:     } else if( glx_pbuffer_supported ) {
nkeynes@736:         glx_pbuffer_init(driver);
nkeynes@545:     } else {
nkeynes@545:         ERROR( "Unable to create render buffers (requires either EXT_framebuffer_object or GLX 1.3+)" );
nkeynes@545:         video_glx_shutdown();
nkeynes@736:         return FALSE;
nkeynes@545:     }
nkeynes@545:     return TRUE;
nkeynes@545: }
nkeynes@545: 
nkeynes@545: 
nkeynes@545: void video_glx_shutdown()
nkeynes@545: {
nkeynes@736:     //    texcache_gl_shutdown();
nkeynes@545:     glx_is_initialized = FALSE;
nkeynes@545:     if( glx_context != NULL ) {
nkeynes@545:         glXDestroyContext( video_x11_display, glx_context );
nkeynes@736:         glx_context = NULL;
nkeynes@545:     }
nkeynes@545:     if( glx_visual != NULL ) {
nkeynes@545:         XFree(glx_visual);
nkeynes@736:         glx_visual = NULL;
nkeynes@545:     }
nkeynes@545: }
nkeynes@545: 
nkeynes@545: 
nkeynes@545: XVisualInfo *video_glx_get_visual()
nkeynes@545: {
nkeynes@545:     return glx_visual;
nkeynes@545: }
nkeynes@545: 
nkeynes@545: 
nkeynes@545: int video_glx_load_font( const gchar *font_name )
nkeynes@545: {
nkeynes@545:     int lists;
nkeynes@545:     XFontStruct *font = XLoadQueryFont(video_x11_display, font_name );
nkeynes@545:     if (font == NULL)
nkeynes@736:         return -1;
nkeynes@736: 
nkeynes@545:     lists = glGenLists(96);
nkeynes@545:     glXUseXFont(font->fid, 32, 96, lists);
nkeynes@545:     XFreeFont(video_x11_display, font);
nkeynes@545:     return lists;
nkeynes@545: }
nkeynes@545: 
nkeynes@545: 
nkeynes@545: void video_glx_swap_buffers( void )
nkeynes@545: {
nkeynes@545:     glXSwapBuffers( video_x11_display, video_x11_window );
nkeynes@545: }
nkeynes@545: 
nkeynes@545: void video_glx_make_window_current( void )
nkeynes@545: {
nkeynes@545:     glXMakeCurrent( video_x11_display, video_x11_window, glx_context );
nkeynes@545: }
nkeynes@545: 
nkeynes@545: 
nkeynes@545: // Pbuffer support
nkeynes@545: 
nkeynes@545: /**
nkeynes@545:  * Construct the initial frame buffers and allocate ids for everything.
nkeynes@545:  * The render handling driver methods are set to the fbo versions.
nkeynes@545:  */
nkeynes@545: static void glx_pbuffer_init( display_driver_t driver ) 
nkeynes@545: {
nkeynes@545:     glGenTextures( 1, &glx_pbuffer_texture );
nkeynes@545:     driver->create_render_buffer = glx_pbuffer_create_render_buffer;
nkeynes@545:     driver->destroy_render_buffer = glx_pbuffer_destroy_render_buffer;
nkeynes@545:     driver->set_render_target = glx_pbuffer_set_render_target;
nkeynes@545:     driver->display_render_buffer = glx_pbuffer_display_render_buffer;
nkeynes@545:     driver->load_frame_buffer = glx_pbuffer_load_frame_buffer;
nkeynes@545:     driver->display_blank = glx_pbuffer_display_blank;
nkeynes@545:     driver->read_render_buffer = glx_pbuffer_read_render_buffer;
nkeynes@545: }
nkeynes@545: 
nkeynes@545: void glx_pbuffer_shutdown()
nkeynes@545: {
nkeynes@545:     glDeleteTextures( 1, &glx_pbuffer_texture );
nkeynes@545: }
nkeynes@545: 
nkeynes@545: static render_buffer_t glx_pbuffer_create_render_buffer( uint32_t width, uint32_t height )
nkeynes@545: {
nkeynes@545:     int attribs[] = { GLX_PBUFFER_WIDTH, width, GLX_PBUFFER_HEIGHT, height,
nkeynes@736:             GLX_PRESERVED_CONTENTS, True, 0 };
nkeynes@545:     GLXPbuffer pb = glXCreatePbuffer( video_x11_display, glx_fbconfig, attribs );
nkeynes@545:     if( pb == (GLXPbuffer)NULL ) {
nkeynes@736:         ERROR( "Unable to create pbuffer" );
nkeynes@736:         return NULL;
nkeynes@545:     }
nkeynes@545:     render_buffer_t buffer = calloc( sizeof(struct render_buffer), 1 );
nkeynes@545:     buffer->width = width;
nkeynes@545:     buffer->height = height;
nkeynes@545:     buffer->buf_id = pb;
nkeynes@545:     return buffer;
nkeynes@545: }
nkeynes@545: 
nkeynes@545: static void glx_pbuffer_destroy_render_buffer( render_buffer_t buffer )
nkeynes@545: {
nkeynes@545:     glXDestroyPbuffer( video_x11_display, (GLXPbuffer)buffer->buf_id );
nkeynes@545:     buffer->buf_id = 0;
nkeynes@545:     free( buffer );
nkeynes@545: }
nkeynes@545: 
nkeynes@545: static gboolean glx_pbuffer_set_render_target( render_buffer_t buffer )
nkeynes@545: {
nkeynes@545:     glFinish();
nkeynes@545:     if( glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context ) == False ) {
nkeynes@736:         ERROR( "Make context current (pbuffer) failed!" );
nkeynes@545:     }
nkeynes@545:     /* setup the gl context */
nkeynes@545:     glViewport( 0, 0, buffer->width, buffer->height );
nkeynes@545:     glDrawBuffer(GL_FRONT);
nkeynes@736: 
nkeynes@545:     return TRUE;
nkeynes@545: }
nkeynes@545: 
nkeynes@545: /**
nkeynes@545:  * Render the texture holding the given buffer to the front window
nkeynes@545:  * buffer.
nkeynes@545:  */
nkeynes@669: static void glx_pbuffer_display_render_buffer( render_buffer_t buffer )
nkeynes@545: {
nkeynes@545:     glFinish();
nkeynes@545:     glReadBuffer( GL_FRONT );
nkeynes@545:     glDrawBuffer( GL_FRONT );
nkeynes@545:     glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context );
nkeynes@545:     glBindTexture( GL_TEXTURE_RECTANGLE_ARB, glx_pbuffer_texture );
nkeynes@545:     glCopyTexImage2D(GL_TEXTURE_RECTANGLE_ARB, 0, GL_RGBA, 0, 0, buffer->width, buffer->height, 0 );
nkeynes@545:     video_glx_make_window_current();
nkeynes@545:     gl_texture_window( buffer->width, buffer->height, glx_pbuffer_texture, buffer->inverted );
nkeynes@545: }
nkeynes@545: 
nkeynes@545: static void glx_pbuffer_load_frame_buffer( frame_buffer_t frame, render_buffer_t buffer )
nkeynes@545: {
nkeynes@545:     glFinish();
nkeynes@545:     glXMakeContextCurrent( video_x11_display, (GLXPbuffer)buffer->buf_id, (GLXPbuffer)buffer->buf_id, glx_context );
nkeynes@545:     GLenum type = colour_formats[frame->colour_format].type;
nkeynes@545:     GLenum format = colour_formats[frame->colour_format].format;
nkeynes@545:     int bpp = colour_formats[frame->colour_format].bpp;
nkeynes@545:     int rowstride = (frame->rowstride / bpp) - frame->width;
nkeynes@736: 
nkeynes@545:     gl_reset_state();
nkeynes@545:     glPixelStorei( GL_UNPACK_ROW_LENGTH, rowstride );
nkeynes@545:     glRasterPos2f(0.375, frame->height-0.375);
nkeynes@545:     glPixelZoom( 1.0, 1.0 );
nkeynes@545:     glDrawPixels( frame->width, frame->height, format, type, frame->data );
nkeynes@545:     glFlush();
nkeynes@545: }
nkeynes@545: 
nkeynes@669: static void glx_pbuffer_display_blank( uint32_t colour )
nkeynes@545: {
nkeynes@545:     glFinish();
nkeynes@545:     video_glx_make_window_current();
nkeynes@669:     gl_display_blank( colour );
nkeynes@545: }
nkeynes@545: 
nkeynes@545: static gboolean glx_pbuffer_read_render_buffer( unsigned char *target, render_buffer_t buffer, 
nkeynes@736:                                                 int rowstride, int format )
nkeynes@545: {
nkeynes@545:     glXMakeCurrent( video_x11_display, (GLXDrawable)buffer->buf_id, glx_context );
nkeynes@545:     glReadBuffer( GL_FRONT );
nkeynes@545:     return gl_read_render_buffer( target, buffer, rowstride, format );
nkeynes@545: }
nkeynes@545: 
nkeynes@545: