add guGetShaderLog() and guGetProgramLog()

glslUtil/glslUtil.c

@@ -1,8 +1,29 @@
 
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <fcntl.h>
 #include <math.h>
 #include <string.h>
 #include "glslUtil.h"
 
+/**************************************************************************
+ * Helper Functions                                                       *
+ *************************************************************************/
+static char *loadFile(const char *fname)
+{
+    struct stat st;
+    if (stat(fname, &st) != 0)
+        return NULL;
+    if (st.st_size <= 0)
+        return NULL;
+    char * buff = malloc(st.st_size + 1);
+    int fd = open(fname, O_RDONLY);
+    read(fd, buff, st.st_size);
+    close(fd);
+    buff[st.st_size] = '\0';
+    return buff;
+}
+
 void guMatrixLoadIdentity(guMatrix4x4 *m)
 {
     int i, j;
@@ -168,3 +189,29 @@ void guOrtho(guMatrix4x4 *m,
     mult[2][3] = - (far + near) / fn;
     mult[3][3] = 1.0;
 }
+
+char *guGetShaderLog(GLuint id)
+{
+    GLint log_length;
+    glGetShaderiv(id, GL_INFO_LOG_LENGTH, &log_length);
+    if (log_length > 0)
+    {
+        char *log = malloc(sizeof(char) * log_length);
+        glGetShaderInfoLog(id, log_length, &log_length, log);
+        return log;
+    }
+    return NULL;
+}
+
+char *guGetProgramLog(GLuint id)
+{
+    GLint log_length;
+    glGetProgramiv(id, GL_INFO_LOG_LENGTH, &log_length);
+    if (log_length > 0)
+    {
+        char *log = malloc(sizeof(char) * log_length);
+        glGetProgramInfoLog(id, log_length, &log_length, log);
+        return log;
+    }
+    return NULL;
+}

glslUtil/glslUtil.h

@@ -30,6 +30,8 @@ void guOrtho(guMatrix4x4 *m,
         GLfloat left, GLfloat right,
         GLfloat bottom, GLfloat top,
         GLfloat near, GLfloat far);
+char *guGetShaderLog(GLuint id);
+char *guGetProgramLog(GLuint id);
 
 #ifdef __cplusplus
 }