Enhancements to breadcrumb trail

shader.cpp

@@ -9,7 +9,7 @@
 int create_shader(const char *filename, int shadertype) {
     FILE* fp = fopen(filename, "r");
     if (!fp) {
-        printf("failed to open vertex shader!\n");
+        printf("failed to open shader file %s!\n", filename);
         return -1;
     }
     fseek(fp, 0L, SEEK_END);
@@ -18,7 +18,7 @@ int create_shader(const char *filename, int shadertype) {
 
     char *buffer = (char *)calloc(sizeof(char), buffer_sz + 1);
     if (fread(buffer, buffer_sz, 1, fp) != 1) {
-        printf("failed to read vertex shader!\n");
+        printf("failed to read shader file %s!\n", filename);
         return -1;
     }
     fclose(fp);