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lxdream.org :: lxdream/src/pvr2/glutil.c
lxdream 0.9.1
released Jun 29
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filename src/pvr2/glutil.c
changeset 1150:1038800cecd8
prev1140:7dc1c71ece76
next1159:580436b01b6c
author nkeynes
date Thu Nov 11 17:51:37 2010 +1000 (10 years ago)
permissions -rw-r--r--
last change Add convenience gl_check_error() function
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     1 /**
     2  * $Id$
     3  *
     4  * GL-based support functions 
     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 <stdlib.h>
    21 #include <glib/gstrfuncs.h>
    22 #include "pvr2/glutil.h"
    24 gboolean isGLSecondaryColorSupported()
    25 {
    26     return isGLExtensionSupported("GL_EXT_secondary_color");
    27 }
    29 gboolean isGLVertexBufferSupported()
    30 {
    31     return isGLExtensionSupported("GL_ARB_vertex_buffer_object");
    32 }
    34 gboolean isGLPixelBufferSupported()
    35 {
    36     return isGLExtensionSupported("GL_ARB_pixel_buffer_object");
    37 }
    39 gboolean isGLMirroredTextureSupported()
    40 {
    41     return isGLExtensionSupported("GL_ARB_texture_mirrored_repeat");
    42 }
    44 /**
    45  * Check if there's at least 2 texture units
    46  */
    47 gboolean isGLMultitextureSupported()
    48 {
    49     if( !isGLExtensionSupported("GL_ARB_multitexture") )
    50         return FALSE;
    51     int units = 0;
    52     glGetIntegerv(GL_MAX_TEXTURE_UNITS_ARB, &units);
    53     return units >= 2;
    54 }
    56 gboolean isGLVertexRangeSupported()
    57 {
    58     return isGLExtensionSupported("GL_APPLE_vertex_array_range") ||
    59             isGLExtensionSupported("GL_NV_vertex_array_range");
    60 }
    62 /**
    63  * Test if a specific extension is supported. From opengl.org
    64  * @param extension extension name to check for
    65  * @return TRUE if supported, otherwise FALSE.
    66  */
    67 gboolean isGLExtensionSupported( const char *extension )
    68 {
    69     const GLubyte *extensions = NULL;
    70     const GLubyte *start;
    71     GLubyte *where, *terminator;
    73     /* Extension names should not have spaces. */
    74     where = (GLubyte *) strchr(extension, ' ');
    75     if (where || *extension == '\0')
    76         return 0;
    77     extensions = glGetString(GL_EXTENSIONS);
    78     if( extensions == NULL ) {
    79         /* No GL available, so we're pretty sure the extension isn't
    80          * available either. */
    81         return FALSE;
    82     }
    83     /* It takes a bit of care to be fool-proof about parsing the
    84        OpenGL extensions string. Don't be fooled by sub-strings,
    85        etc. */
    86     start = extensions;
    87     for (;;) {
    88         where = (GLubyte *) strstr((const char *) start, extension);
    89         if (!where)
    90             break;
    91         terminator = where + strlen(extension);
    92         if (where == start || *(where - 1) == ' ')
    93             if (*terminator == ' ' || *terminator == '\0')
    94                 return TRUE;
    95         start = terminator;
    96     }
    97     return FALSE;
    98 }
   100 int compare_charp( const void *a, const void *b )
   101 {
   102     const char **ca = (const char **)a;
   103     const char **cb = (const char **)b;
   104     return strcmp(*ca, *cb);
   105 }
   107 #define DEFAULT_TERMINAL_COLUMNS 80
   108 #define DEFAULT_COLUMN_WIDTH 34
   110 /**
   111  * Format a GL extension list (or other space-separated string) nicely, and
   112  * print to the given output stream.
   113  */
   115 void fprint_extensions( FILE *out, const char *extensions )
   116 {
   117     unsigned int i, j, count, maxlen = DEFAULT_COLUMN_WIDTH, columns, per_column, terminal_columns;
   118     const char *terminal_columns_str = getenv("COLUMNS");
   119     if( terminal_columns_str == NULL || (terminal_columns = strtol(terminal_columns_str,0,10)) == 0 )
   120         terminal_columns = DEFAULT_TERMINAL_COLUMNS;
   122     if( extensions == NULL || extensions[0] == '\0' )
   123         return;
   125     gchar *ext_dup = g_strdup(extensions);
   126     gchar **ext_split = g_strsplit(g_strstrip(extensions), " ", 0);
   127     for( count = 0; ext_split[count] != NULL; count++ ) {
   128         unsigned len = strlen(ext_split[count]);
   129         if( len > maxlen )
   130             maxlen = len;
   131     }
   133     columns = terminal_columns / (maxlen+2);
   134     if( columns == 0 )
   135         columns = 1;
   136     per_column = (count+columns-1) / columns;
   138     qsort(ext_split, count, sizeof(gchar *), compare_charp);
   140     for( i=0; i<per_column; i++ ) {
   141         for( j=0; j<columns; j++ ) {
   142             unsigned idx = i + (j*per_column);
   143             if( idx < count )
   144                 fprintf( out, "  %-*s", maxlen, ext_split[idx] );
   145         }
   146         fprintf( out, "\n" );
   147     }
   148     g_strfreev(ext_split);
   149     g_free(ext_dup);
   150 }
   152 void glPrintInfo( FILE *out )
   153 {
   154     fprintf( out, "GL Vendor: %s\n", glGetString(GL_VENDOR) );
   155     fprintf( out, "GL Renderer: %s\n", glGetString(GL_RENDERER) );
   156     fprintf( out, "GL Version: %s\n", glGetString(GL_VERSION) );
   157     if( glsl_is_supported() ) {
   158          const char * version = glsl_get_version();
   159          fprintf( out, "SL Version: %s\n", version );
   160     }
   162     fprintf( out, "GL Extensions:\n" );
   164     fprint_extensions( out, (const gchar *)glGetString(GL_EXTENSIONS) );
   165     if( display_driver && display_driver->print_info ) {
   166         fprintf( out, "\n");
   167         display_driver->print_info(out);
   168     }
   169 }
   171 gboolean gl_check_error(const char *context)
   172 {
   173     GLint err = glGetError();
   174     if( err != 0 ) {
   175         const char *s;
   176         switch( err ) {
   177         case GL_INVALID_ENUM: s = "Invalid enum"; break;
   178         case GL_INVALID_VALUE: s = "Invalid value"; break;
   179         case GL_INVALID_OPERATION: s = "Invalid operation"; break;
   180         case GL_STACK_OVERFLOW: s = "Stack overflow"; break;
   181         case GL_STACK_UNDERFLOW: s = "Stack underflow"; break;
   182         case GL_OUT_OF_MEMORY:   s = "Out of memory"; break;
   183         default: s = "Unknown error"; break;
   184         }
   185         if( context ) {
   186             WARN( "%s: GL error: %x (%s)\n", context, err, s );
   187         } else {
   188             WARN( "GL error: %x (%s)\n", err, s );
   189         }
   190         return TRUE;
   191     }
   192     return FALSE;
   193 }
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