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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 1258:f8a9c0fd2abb
prev1248:0ea1904e2b14
next1275:83b15705cdde
author nkeynes
date Mon Mar 05 11:41:03 2012 +1000 (8 years ago)
permissions -rw-r--r--
last change Small cleanups:
Refactor the post-windowing setup into gl_init_driver() in video_gl.c
Move gl_sl.c into src/drivers and tidy up a bit.
Fix OS X compiling plugins with -mdynamic-no-pic
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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 isOpenGLES2()
    25 {
    26     const char *str = glGetString(GL_VERSION);
    27     if( strncmp(str, "OpenGL ES 2.", 12) == 0 ) {
    28         return TRUE;
    29     }
    30 }
    32 gboolean isGLSecondaryColorSupported()
    33 {
    34     return isGLExtensionSupported("GL_EXT_secondary_color");
    35 }
    37 gboolean isGLVertexBufferSupported()
    38 {
    39     return isGLExtensionSupported("GL_ARB_vertex_buffer_object");
    40 }
    42 gboolean isGLPixelBufferSupported()
    43 {
    44     return isGLExtensionSupported("GL_ARB_pixel_buffer_object");
    45 }
    47 gboolean isGLMirroredTextureSupported()
    48 {
    49     return isGLExtensionSupported("GL_ARB_texture_mirrored_repeat");
    50 }
    53 gboolean isGLShaderSupported()
    54 {
    55     return isOpenGLES2() || (isGLExtensionSupported("GL_ARB_fragment_shader") &&
    56     isGLExtensionSupported("GL_ARB_vertex_shader") &&
    57     isGLExtensionSupported("GL_ARB_shading_language_100"));
    58 }
    60 /**
    61  * Check if there's at least 2 texture units
    62  */
    63 gboolean isGLMultitextureSupported()
    64 {
    65     if( !isOpenGLES2() && !isGLExtensionSupported("GL_ARB_multitexture") )
    66         return FALSE;
    67     int units = 0;
    69 #if defined(GL_MAX_TEXTURE_UNITS)
    70         glGetIntegerv(GL_MAX_TEXTURE_UNITS, &units);
    71 #elif defined(GL_MAX_TEXTURE_IMAGE_UNITS)
    72         glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &units);
    73 #endif
    74     return units >= 2;
    75 }
    77 gboolean isGLVertexRangeSupported()
    78 {
    79     return isGLExtensionSupported("GL_APPLE_vertex_array_range") ||
    80             isGLExtensionSupported("GL_NV_vertex_array_range");
    81 }
    83 /**
    84  * Test if a specific extension is supported. From opengl.org
    85  * @param extension extension name to check for
    86  * @return TRUE if supported, otherwise FALSE.
    87  */
    88 gboolean isGLExtensionSupported( const char *extension )
    89 {
    90     const GLubyte *extensions = NULL;
    91     const GLubyte *start;
    92     GLubyte *where, *terminator;
    94     /* Extension names should not have spaces. */
    95     where = (GLubyte *) strchr(extension, ' ');
    96     if (where || *extension == '\0')
    97         return 0;
    98     extensions = glGetString(GL_EXTENSIONS);
    99     if( extensions == NULL ) {
   100         /* No GL available, so we're pretty sure the extension isn't
   101          * available either. */
   102         return FALSE;
   103     }
   104     /* It takes a bit of care to be fool-proof about parsing the
   105        OpenGL extensions string. Don't be fooled by sub-strings,
   106        etc. */
   107     start = extensions;
   108     for (;;) {
   109         where = (GLubyte *) strstr((const char *) start, extension);
   110         if (!where)
   111             break;
   112         terminator = where + strlen(extension);
   113         if (where == start || *(where - 1) == ' ')
   114             if (*terminator == ' ' || *terminator == '\0')
   115                 return TRUE;
   116         start = terminator;
   117     }
   118     return FALSE;
   119 }
   121 int compare_charp( const void *a, const void *b )
   122 {
   123     const char **ca = (const char **)a;
   124     const char **cb = (const char **)b;
   125     return strcmp(*ca, *cb);
   126 }
   128 #define DEFAULT_TERMINAL_COLUMNS 80
   129 #define DEFAULT_COLUMN_WIDTH 34
   131 int glGetMaxColourAttachments()
   132 {
   133 #ifdef GL_MAX_COLOR_ATTACHMENTS
   134     GLint result = 0;
   135     glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &result);
   136     return result;
   137 #else
   138     return 1;
   139 #endif
   140 }
   143 /**
   144  * Define an orthographic projection matrix
   145  * Note: row-major order
   146  */
   147 void defineOrthoMatrix( GLfloat *matrix, GLfloat width, GLfloat height, GLfloat znear, GLfloat zfar )
   148 {
   149     matrix[0] =  2/width;
   150     matrix[1] =  0;
   151     matrix[2] =  0;
   152     matrix[3] =  0;
   154     matrix[4] =  0;
   155     matrix[5] = -2/height;
   156     matrix[6] =  0;
   157     matrix[7] =  0;
   159     matrix[8] =  0;
   160     matrix[9] =  0;
   161     matrix[10]= -2/(zfar-znear);
   162     matrix[11]=  0;
   164     matrix[12]= -1;
   165     matrix[13]=  1;
   166     matrix[14]= -(zfar+znear)/(zfar-znear);
   167     matrix[15]=  1;
   168 }
   170 /**
   171  * Format a GL extension list (or other space-separated string) nicely, and
   172  * print to the given output stream.
   173  */
   175 void fprint_extensions( FILE *out, const char *extensions )
   176 {
   177     unsigned int i, j, count, maxlen = DEFAULT_COLUMN_WIDTH, columns, per_column, terminal_columns;
   178     const char *terminal_columns_str = getenv("COLUMNS");
   179     if( terminal_columns_str == NULL || (terminal_columns = strtol(terminal_columns_str,0,10)) == 0 )
   180         terminal_columns = DEFAULT_TERMINAL_COLUMNS;
   182     if( extensions == NULL || extensions[0] == '\0' )
   183         return;
   185     gchar *ext_dup = g_strdup(extensions);
   186     gchar **ext_split = g_strsplit(g_strstrip(extensions), " ", 0);
   187     for( count = 0; ext_split[count] != NULL; count++ ) {
   188         unsigned len = strlen(ext_split[count]);
   189         if( len > maxlen )
   190             maxlen = len;
   191     }
   193     columns = terminal_columns / (maxlen+2);
   194     if( columns == 0 )
   195         columns = 1;
   196     per_column = (count+columns-1) / columns;
   198     qsort(ext_split, count, sizeof(gchar *), compare_charp);
   200     for( i=0; i<per_column; i++ ) {
   201         for( j=0; j<columns; j++ ) {
   202             unsigned idx = i + (j*per_column);
   203             if( idx < count )
   204                 fprintf( out, "  %-*s", maxlen, ext_split[idx] );
   205         }
   206         fprintf( out, "\n" );
   207     }
   208     g_strfreev(ext_split);
   209     g_free(ext_dup);
   210 }
   212 void glPrintInfo( FILE *out )
   213 {
   214     fprintf( out, "GL Vendor: %s\n", glGetString(GL_VENDOR) );
   215     fprintf( out, "GL Renderer: %s\n", glGetString(GL_RENDERER) );
   216     fprintf( out, "GL Version: %s\n", glGetString(GL_VERSION) );
   217     if( isGLShaderSupported() ) {
   218          fprintf( out, "SL Version: %s\n", glGetString(GL_SHADING_LANGUAGE_VERSION) );
   219     }
   221     fprintf( out, "GL Extensions:\n" );
   223     fprint_extensions( out, (const gchar *)glGetString(GL_EXTENSIONS) );
   224     if( display_driver && display_driver->print_info ) {
   225         fprintf( out, "\n");
   226         display_driver->print_info(out);
   227     }
   228 }
   230 gboolean gl_check_error(const char *context)
   231 {
   232     GLint err = glGetError();
   233     if( err != 0 ) {
   234         const char *s;
   235         switch( err ) {
   236         case GL_INVALID_ENUM: s = "Invalid enum"; break;
   237         case GL_INVALID_VALUE: s = "Invalid value"; break;
   238         case GL_INVALID_OPERATION: s = "Invalid operation"; break;
   239 #ifdef GL_STACK_OVERFLOW
   240         case GL_STACK_OVERFLOW: s = "Stack overflow"; break;
   241 #endif
   242 #ifdef GL_STACK_UNDERFLOW
   243         case GL_STACK_UNDERFLOW: s = "Stack underflow"; break;
   244 #endif
   245         case GL_OUT_OF_MEMORY:   s = "Out of memory"; break;
   246         default: s = "Unknown error"; break;
   247         }
   248         if( context ) {
   249             WARN( "%s: GL error: %x (%s)\n", context, err, s );
   250         } else {
   251             WARN( "GL error: %x (%s)\n", err, s );
   252         }
   253         return FALSE;
   254     }
   255     return TRUE;
   256 }
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