Examples: GLFW+GL2/GL3: Minor tweaks, comments.

examples/opengl2_example/imgui_impl_glfw.cpp

@@ -26,7 +26,7 @@
 // Data
 static GLFWwindow*  g_Window = NULL;
 static double       g_Time = 0.0f;
-static bool         g_MousePressed[3] = { false, false, false };
+static bool         g_MouseJustPressed[3] = { false, false, false };
 static float        g_MouseWheel = 0.0f;
 static GLuint       g_FontTexture = 0;
 
@@ -129,7 +129,7 @@ static void ImGui_ImplGlfwGL2_SetClipboardText(void* user_data, const char* text
 void ImGui_ImplGlfwGL2_MouseButtonCallback(GLFWwindow*, int button, int action, int /*mods*/)
 {
     if (action == GLFW_PRESS && button >= 0 && button < 3)
-        g_MousePressed[button] = true;
+        g_MouseJustPressed[button] = true;
 }
 
 void ImGui_ImplGlfwGL2_ScrollCallback(GLFWwindow*, double /*xoffset*/, double yoffset)
@@ -287,8 +287,9 @@ void ImGui_ImplGlfwGL2_NewFrame()
 
     for (int i = 0; i < 3; i++)
     {
-        io.MouseDown[i] = g_MousePressed[i] || glfwGetMouseButton(g_Window, i) != 0;    // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
+        // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
-        g_MousePressed[i] = false;
+        io.MouseDown[i] = g_MouseJustPressed[i] || glfwGetMouseButton(g_Window, i) != 0;
+        g_MouseJustPressed[i] = false;
     }
 
     io.MouseWheel = g_MouseWheel;

examples/opengl3_example/imgui_impl_glfw_gl3.cpp

@@ -22,7 +22,7 @@
 // Data
 static GLFWwindow*  g_Window = NULL;
 static double       g_Time = 0.0f;
-static bool         g_MousePressed[3] = { false, false, false };
+static bool         g_MouseJustPressed[3] = { false, false, false };
 static float        g_MouseWheel = 0.0f;
 static GLuint       g_FontTexture = 0;
 static int          g_ShaderHandle = 0, g_VertHandle = 0, g_FragHandle = 0;
@@ -150,7 +150,7 @@ static void ImGui_ImplGlfwGL3_SetClipboardText(void* user_data, const char* text
 void ImGui_ImplGlfwGL3_MouseButtonCallback(GLFWwindow*, int button, int action, int /*mods*/)
 {
     if (action == GLFW_PRESS && button >= 0 && button < 3)
-        g_MousePressed[button] = true;
+        g_MouseJustPressed[button] = true;
 }
 
 void ImGui_ImplGlfwGL3_ScrollCallback(GLFWwindow*, double /*xoffset*/, double yoffset)
@@ -401,8 +401,9 @@ void ImGui_ImplGlfwGL3_NewFrame()
 
     for (int i = 0; i < 3; i++)
     {
-        io.MouseDown[i] = g_MousePressed[i] || glfwGetMouseButton(g_Window, i) != 0;    // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
+        // If a mouse press event came, always pass it as "mouse held this frame", so we don't miss click-release events that are shorter than 1 frame.
-        g_MousePressed[i] = false;
+        io.MouseDown[i] = g_MouseJustPressed[i] || glfwGetMouseButton(g_Window, i) != 0;
+        g_MouseJustPressed[i] = false;
     }
 
     io.MouseWheel = g_MouseWheel;