Add min and max blend modes.

src/libGLESv2/libGLESv2.cpp

@@ -559,12 +559,23 @@ void __stdcall glBlendEquationSeparate(GLenum modeRGB, GLenum modeAlpha)
 
     try
     {
+        gl::Context *context = gl::getNonLostContext();
+
         switch (modeRGB)
         {
           case GL_FUNC_ADD:
           case GL_FUNC_SUBTRACT:
           case GL_FUNC_REVERSE_SUBTRACT:
             break;
+
+          case GL_MIN:
+          case GL_MAX:
+            if (context && context->getClientVersion() < 3)
+            {
+                return gl::error(GL_INVALID_ENUM);
+            }
+            break;
+
           default:
             return gl::error(GL_INVALID_ENUM);
         }
@@ -575,12 +586,19 @@ void __stdcall glBlendEquationSeparate(GLenum modeRGB, GLenum modeAlpha)
           case GL_FUNC_SUBTRACT:
           case GL_FUNC_REVERSE_SUBTRACT:
             break;
+
+          case GL_MIN:
+          case GL_MAX:
+            if (context && context->getClientVersion() < 3)
+            {
+                return gl::error(GL_INVALID_ENUM);
+            }
+            break;
+
           default:
             return gl::error(GL_INVALID_ENUM);
         }
 
-        gl::Context *context = gl::getNonLostContext();
-
         if (context)
         {
             context->setBlendEquation(modeRGB, modeAlpha);

src/libGLESv2/renderer/renderer11_utils.cpp

@@ -51,6 +51,8 @@ D3D11_BLEND_OP ConvertBlendOp(GLenum glBlendOp)
       case GL_FUNC_ADD:              d3dBlendOp = D3D11_BLEND_OP_ADD;           break;
       case GL_FUNC_SUBTRACT:         d3dBlendOp = D3D11_BLEND_OP_SUBTRACT;      break;
       case GL_FUNC_REVERSE_SUBTRACT: d3dBlendOp = D3D11_BLEND_OP_REV_SUBTRACT;  break;
+      case GL_MIN:                   d3dBlendOp = D3D11_BLEND_OP_MIN;           break;
+      case GL_MAX:                   d3dBlendOp = D3D11_BLEND_OP_MAX;           break;
       default: UNREACHABLE();
     }