Merge pull request #110 from juan-medina/master

adding SetTraceLogCallback

examples/utils/utils.go

@@ -0,0 +1,46 @@
+package main
+
+import (
+	"github.com/gen2brain/raylib-go/raylib"
+	"log"
+)
+
+func main() {
+	rl.SetTraceLogCallback(func(logType int, str string) {
+		level := ""
+		switch logType {
+		case rl.LogDebug:
+			level = "Debug"
+		case rl.LogError:
+			level = "Error"
+		case rl.LogInfo:
+			level = "Info"
+		case rl.LogTrace:
+			level = "Trace"
+		case rl.LogWarning:
+			level = "Warning"
+		case rl.LogFatal:
+			level = "Fatal"
+		}
+		if logType != rl.LogFatal {
+			log.Printf("%s - %s", level, str)
+		} else {
+			log.Fatalf("%s - %s", level, str)
+		}
+	})
+
+	rl.SetConfigFlags(rl.FlagVsyncHint)
+	rl.InitWindow(800, 450, "raylib [utils] example - SetTraceLogCallback")
+
+	for !rl.WindowShouldClose() {
+		rl.BeginDrawing()
+
+		rl.ClearBackground(rl.RayWhite)
+
+		rl.DrawText("The raylib trace log is controlled in GO!", 190, 200, 20, rl.LightGray)
+
+		rl.EndDrawing()
+	}
+
+	rl.CloseWindow()
+}

raylib/utils_log.c

@@ -0,0 +1,18 @@
+#include "raylib.h"
+#include "utils_log.h"
+#include <stdio.h>                      // Required for: vprintf()
+#include <string.h>                     // Required for: strcpy(), strcat()
+
+#define MAX_TRACELOG_BUFFER_SIZE   128  // As defined in utils.c from raylib
+
+void rayLogWrapperCallback(int logType, const char *text, va_list args) {
+	char buffer[MAX_TRACELOG_BUFFER_SIZE] = { 0 };
+
+	vsprintf(buffer, text, args);
+
+	internalTraceLogCallbackGo(logType, buffer, strlen(buffer));
+}
+
+void setLogCallbackWrapper(void) {
+	SetTraceLogCallback(rayLogWrapperCallback);
+}

raylib/utils_log.go

@@ -0,0 +1,26 @@
+package rl
+
+/*
+#include "utils_log.h"
+*/
+import "C"
+
+import "unsafe"
+
+// TraceLogCallbackFun - function that will recive the trace log messages
+type TraceLogCallbackFun func(int, string)
+
+var internalTraceLogCallbackFun TraceLogCallbackFun = func(int, string) {}
+
+// SetTraceLogCallback - set a call-back function for trace log
+func SetTraceLogCallback(fn TraceLogCallbackFun) {
+	internalTraceLogCallbackFun = fn
+	C.setLogCallbackWrapper()
+}
+
+//export internalTraceLogCallbackGo
+func internalTraceLogCallbackGo(logType C.int, cstr unsafe.Pointer, len C.int) {
+	str := string(C.GoBytes(cstr, len))
+	lt := int(logType)
+	internalTraceLogCallbackFun(lt, str)
+}

raylib/utils_log.h

@@ -0,0 +1,11 @@
+#if defined(__cplusplus)
+extern "C" {            // Prevents name mangling of functions
+#endif
+
+
+void setLogCallbackWrapper(void);                 // enable the call-back
+void internalTraceLogCallbackGo(int, void*, int); // Go function that will get called
+
+#if defined(__cplusplus)
+}
+#endif