Fix compile error for OpenGL ES

modules/game_minimap/minimap.lua

@@ -2,6 +2,7 @@ minimapWidget = nil
 minimapButton = nil
 minimapWindow = nil
 otmm = true
+preloaded = false
 
 function init()
   minimapButton = modules.client_topmenu.addRightGameToggleButton('minimapButton', tr('Minimap') .. ' (Ctrl+M)', '/images/topbuttons/minimap', toggle)
@@ -66,8 +67,13 @@ function onMiniWindowClose()
   minimapButton:setOn(false)
 end
 
+function preload()
+  loadMap(false)
+  preloaded = true
+end
+
 function online()
-  loadMap()
+  loadMap(not preloaded)
   minimapWidget:followLocalPlayer()
 end
 
@@ -75,9 +81,12 @@ function offline()
   saveMap()
 end
 
-function loadMap()
+function loadMap(clean)
   local protocolVersion = g_game.getProtocolVersion()
-  g_minimap.clean()
+
+  if clean then
+    g_minimap.clean()
+  end
 
   if otmm then
     local minimapFile = '/minimap.otmm'

src/framework/graphics/graphics.cpp

@@ -360,9 +360,9 @@ bool Graphics::canUseBlendFuncSeparate()
 bool Graphics::canUseBlendEquation()
 {
 #if OPENGL_ES==2
-    return true;
+    return false;
 #elif OPENGL_ES==1
-    return true;
+    return false;
 #else
     if(!GLEW_VERSION_1_4)
         return false;

src/framework/graphics/painter.cpp

@@ -289,14 +289,7 @@ void Painter::updateGlBlendEquation()
 {
     if(!g_graphics.canUseBlendEquation())
         return;
-    switch(m_blendEquation) {
-        case BlendEquation_Max:
-            glBlendEquation(GL_MAX);
-            break;
-        case BlendEquation_Add:
-            glBlendEquation(GL_FUNC_ADD);
-            break;
-    }
+    glBlendEquation(m_blendEquation);
 }
 
 void Painter::updateGlClipRect()

src/framework/graphics/painter.h

@@ -44,8 +44,8 @@ public:
         TriangleStrip = GL_TRIANGLE_STRIP
     };
     enum BlendEquation {
-        BlendEquation_Add,
-        BlendEquation_Max,
+        BlendEquation_Add = 0x8006, // GL_FUNC_ADD
+        BlendEquation_Max = 0x8008, // GL_MAX
     };
 
     struct PainterState {