filename | src/pvr2/glutil.c |
changeset | 1276:e20a69167093 |
prev | 1275:83b15705cdde |
next | 1282:9f445c5e252b |
author | nkeynes |
date | Wed Mar 21 14:45:27 2012 +1000 (12 years ago) |
permissions | -rw-r--r-- |
last change | Make sure we destroy the render buffers as part of the GL shutdown (fixes bug with render buffers not being recreated when we re-init the GL). |
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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 return FALSE;
31 }
33 gboolean isGLSecondaryColorSupported()
34 {
35 return isGLExtensionSupported("GL_EXT_secondary_color");
36 }
38 gboolean isGLVertexBufferSupported()
39 {
40 return isGLExtensionSupported("GL_ARB_vertex_buffer_object");
41 }
43 gboolean isGLPixelBufferSupported()
44 {
45 return isGLExtensionSupported("GL_ARB_pixel_buffer_object");
46 }
48 gboolean isGLMirroredTextureSupported()
49 {
50 return isGLExtensionSupported("GL_ARB_texture_mirrored_repeat");
51 }
53 gboolean isGLBGRATextureSupported()
54 {
55 /* Note: e.g. Tegra 3 reports GL_EXT_bgra, but it doesn't actually work.
56 * Need to check this with NVIDIA, in meantime assume GLES2 doesn't have
57 * BGRA support */
58 return !isOpenGLES2() && isGLExtensionSupported("GL_EXT_bgra");
59 }
62 gboolean isGLShaderSupported()
63 {
64 return isOpenGLES2() || (isGLExtensionSupported("GL_ARB_fragment_shader") &&
65 isGLExtensionSupported("GL_ARB_vertex_shader") &&
66 isGLExtensionSupported("GL_ARB_shading_language_100"));
67 }
69 /**
70 * Check if there's at least 2 texture units
71 */
72 gboolean isGLMultitextureSupported()
73 {
74 if( !isOpenGLES2() && !isGLExtensionSupported("GL_ARB_multitexture") )
75 return FALSE;
76 int units = 0;
78 #if defined(GL_MAX_TEXTURE_UNITS)
79 glGetIntegerv(GL_MAX_TEXTURE_UNITS, &units);
80 #elif defined(GL_MAX_TEXTURE_IMAGE_UNITS)
81 glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &units);
82 #endif
83 return units >= 2;
84 }
86 gboolean isGLVertexRangeSupported()
87 {
88 return isGLExtensionSupported("GL_APPLE_vertex_array_range") ||
89 isGLExtensionSupported("GL_NV_vertex_array_range");
90 }
92 /**
93 * Test if a specific extension is supported. From opengl.org
94 * @param extension extension name to check for
95 * @return TRUE if supported, otherwise FALSE.
96 */
97 gboolean isGLExtensionSupported( const char *extension )
98 {
99 const GLubyte *extensions = NULL;
100 const GLubyte *start;
101 GLubyte *where, *terminator;
103 /* Extension names should not have spaces. */
104 where = (GLubyte *) strchr(extension, ' ');
105 if (where || *extension == '\0')
106 return 0;
107 extensions = glGetString(GL_EXTENSIONS);
108 if( extensions == NULL ) {
109 /* No GL available, so we're pretty sure the extension isn't
110 * available either. */
111 return FALSE;
112 }
113 /* It takes a bit of care to be fool-proof about parsing the
114 OpenGL extensions string. Don't be fooled by sub-strings,
115 etc. */
116 start = extensions;
117 for (;;) {
118 where = (GLubyte *) strstr((const char *) start, extension);
119 if (!where)
120 break;
121 terminator = where + strlen(extension);
122 if (where == start || *(where - 1) == ' ')
123 if (*terminator == ' ' || *terminator == '\0')
124 return TRUE;
125 start = terminator;
126 }
127 return FALSE;
128 }
130 int compare_charp( const void *a, const void *b )
131 {
132 const char **ca = (const char **)a;
133 const char **cb = (const char **)b;
134 return strcmp(*ca, *cb);
135 }
137 #define DEFAULT_TERMINAL_COLUMNS 80
138 #define DEFAULT_COLUMN_WIDTH 34
140 int glGetMaxColourAttachments()
141 {
142 #ifdef GL_MAX_COLOR_ATTACHMENTS
143 GLint result = 0;
144 glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &result);
145 return result;
146 #else
147 return 1;
148 #endif
149 }
152 /**
153 * Define an orthographic projection matrix
154 * Note: row-major order
155 */
156 void defineOrthoMatrix( GLfloat *matrix, GLfloat width, GLfloat height, GLfloat znear, GLfloat zfar )
157 {
158 matrix[0] = 2/width;
159 matrix[1] = 0;
160 matrix[2] = 0;
161 matrix[3] = 0;
163 matrix[4] = 0;
164 matrix[5] = -2/height;
165 matrix[6] = 0;
166 matrix[7] = 0;
168 matrix[8] = 0;
169 matrix[9] = 0;
170 matrix[10]= -2/(zfar-znear);
171 matrix[11]= 0;
173 matrix[12]= -1;
174 matrix[13]= 1;
175 matrix[14]= -(zfar+znear)/(zfar-znear);
176 matrix[15]= 1;
177 }
179 /**
180 * Format a GL extension list (or other space-separated string) nicely, and
181 * print to the given output stream.
182 */
184 void fprint_extensions( FILE *out, const char *extensions )
185 {
186 unsigned int i, j, count, maxlen = DEFAULT_COLUMN_WIDTH, columns, per_column, terminal_columns;
187 const char *terminal_columns_str = getenv("COLUMNS");
188 if( terminal_columns_str == NULL || (terminal_columns = strtol(terminal_columns_str,0,10)) == 0 )
189 terminal_columns = DEFAULT_TERMINAL_COLUMNS;
191 if( extensions == NULL || extensions[0] == '\0' )
192 return;
194 gchar *ext_dup = g_strdup(extensions);
195 gchar **ext_split = g_strsplit(g_strstrip(extensions), " ", 0);
196 for( count = 0; ext_split[count] != NULL; count++ ) {
197 unsigned len = strlen(ext_split[count]);
198 if( len > maxlen )
199 maxlen = len;
200 }
202 columns = terminal_columns / (maxlen+2);
203 if( columns == 0 )
204 columns = 1;
205 per_column = (count+columns-1) / columns;
207 qsort(ext_split, count, sizeof(gchar *), compare_charp);
209 for( i=0; i<per_column; i++ ) {
210 for( j=0; j<columns; j++ ) {
211 unsigned idx = i + (j*per_column);
212 if( idx < count )
213 fprintf( out, " %-*s", maxlen, ext_split[idx] );
214 }
215 fprintf( out, "\n" );
216 }
217 g_strfreev(ext_split);
218 g_free(ext_dup);
219 }
221 void glPrintInfo( FILE *out )
222 {
223 fprintf( out, "GL Vendor: %s\n", glGetString(GL_VENDOR) );
224 fprintf( out, "GL Renderer: %s\n", glGetString(GL_RENDERER) );
225 fprintf( out, "GL Version: %s\n", glGetString(GL_VERSION) );
226 if( isGLShaderSupported() ) {
227 fprintf( out, "SL Version: %s\n", glGetString(GL_SHADING_LANGUAGE_VERSION) );
228 }
230 fprintf( out, "GL Extensions:\n" );
232 fprint_extensions( out, (const gchar *)glGetString(GL_EXTENSIONS) );
233 if( display_driver && display_driver->print_info ) {
234 fprintf( out, "\n");
235 display_driver->print_info(out);
236 }
237 }
239 gboolean gl_check_error(const char *context)
240 {
241 GLint err = glGetError();
242 if( err != 0 ) {
243 const char *s;
244 switch( err ) {
245 case GL_INVALID_ENUM: s = "Invalid enum"; break;
246 case GL_INVALID_VALUE: s = "Invalid value"; break;
247 case GL_INVALID_OPERATION: s = "Invalid operation"; break;
248 #ifdef GL_STACK_OVERFLOW
249 case GL_STACK_OVERFLOW: s = "Stack overflow"; break;
250 #endif
251 #ifdef GL_STACK_UNDERFLOW
252 case GL_STACK_UNDERFLOW: s = "Stack underflow"; break;
253 #endif
254 case GL_OUT_OF_MEMORY: s = "Out of memory"; break;
255 default: s = "Unknown error"; break;
256 }
257 if( context ) {
258 WARN( "%s: GL error: %x (%s)\n", context, err, s );
259 } else {
260 WARN( "GL error: %x (%s)\n", err, s );
261 }
262 return FALSE;
263 }
264 return TRUE;
265 }
.