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Diffstat (limited to 'src/lib/esUtil.c')
-rw-r--r-- | src/lib/esUtil.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/src/lib/esUtil.c b/src/lib/esUtil.c new file mode 100644 index 0000000..9c157c9 --- /dev/null +++ b/src/lib/esUtil.c @@ -0,0 +1,107 @@ +//
+// Book: OpenGL(R) ES 2.0 Programming Guide
+// Authors: Aaftab Munshi, Dan Ginsburg, Dave Shreiner
+// ISBN-10: 0321502795
+// ISBN-13: 9780321502797
+// Publisher: Addison-Wesley Professional
+// URLs: http://safari.informit.com/9780321563835
+// http://www.opengles-book.com
+//
+
+// ESUtil.c
+//
+// A utility library for OpenGL ES. This library provides a
+// basic common framework for the example applications in the
+// OpenGL ES 2.0 Programming Guide.
+//
+
+///
+// Includes
+//
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <sys/time.h>
+#include "esUtil.h"
+
+///
+// esLogMessage()
+//
+// Log an error message to the debug output for the platform
+//
+void ESUTIL_API esLogMessage ( const char *formatStr, ... )
+{
+ va_list params;
+ char buf[BUFSIZ];
+
+ va_start ( params, formatStr );
+ vsprintf ( buf, formatStr, params );
+
+ printf ( "%s", buf );
+
+ va_end ( params );
+}
+
+
+///
+// esLoadTGA()
+//
+// Loads a 24-bit TGA image from a file. This is probably the simplest TGA loader ever.
+// Does not support loading of compressed TGAs nor TGAa with alpha channel. But for the
+// sake of the examples, this is sufficient.
+//
+
+char* ESUTIL_API esLoadTGA ( char *fileName, int *width, int *height )
+{
+ char *buffer = NULL;
+ FILE *f;
+ unsigned char tgaheader[12];
+ unsigned char attributes[6];
+ unsigned int imagesize;
+
+ f = fopen(fileName, "rb");
+ if(f == NULL) return NULL;
+
+ if(fread(&tgaheader, sizeof(tgaheader), 1, f) == 0)
+ {
+ fclose(f);
+ return NULL;
+ }
+
+ if(fread(attributes, sizeof(attributes), 1, f) == 0)
+ {
+ fclose(f);
+ return 0;
+ }
+
+ *width = attributes[1] * 256 + attributes[0];
+ *height = attributes[3] * 256 + attributes[2];
+ imagesize = attributes[4] / 8 * *width * *height;
+ buffer = malloc(imagesize);
+ if (buffer == NULL)
+ {
+ fclose(f);
+ return 0;
+ }
+
+ if(fread(buffer, 1, imagesize, f) != imagesize)
+ {
+ free(buffer);
+ return NULL;
+ }
+ fclose(f);
+ return buffer;
+}
+
+double esNow(void)
+{
+ struct timeval tv;
+#ifdef __VMS
+ (void) gettimeofday(&tv, NULL );
+#else
+ (void) gettimeofday(&tv, NULL);
+#endif
+ return tv.tv_sec * 1.0 + tv.tv_usec / 1000000.0;
+}
+
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