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Verify gamepad mapping indices match hardware

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This commit is contained in:
Camilla Löwy 2017-11-29 19:30:08 +01:00
parent 7c87948eaf
commit c2858e9ed7
1 changed files with 54 additions and 2 deletions
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56
src/input.c
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@ -57,6 +57,58 @@ static _GLFWmapping* findMapping(const char* guid)
return NULL;
}
// Checks whether a gamepad mapping element is present in the hardware
//
static GLFWbool isValidElementForJoystick(const _GLFWmapelement* e,
const _GLFWjoystick* js)
{
if (e->type == _GLFW_JOYSTICK_HATBIT && (e->value >> 4) >= js->hatCount)
return GLFW_FALSE;
else if (e->type == _GLFW_JOYSTICK_BUTTON && e->value >= js->buttonCount)
return GLFW_FALSE;
else if (e->type == _GLFW_JOYSTICK_AXIS && e->value >= js->axisCount)
return GLFW_FALSE;
return GLFW_TRUE;
}
// Finds a mapping based on joystick GUID and verifies element indices
//
static _GLFWmapping* findValidMapping(const _GLFWjoystick* js)
{
_GLFWmapping* mapping = findMapping(js->guid);
if (mapping)
{
int i;
for (i = 0; i <= GLFW_GAMEPAD_BUTTON_LAST; i++)
{
if (!isValidElementForJoystick(mapping->buttons + i, js))
{
_glfwInputError(GLFW_INVALID_VALUE,
"Invalid button in gamepad mapping %s (%s)",
mapping->guid,
mapping->name);
return NULL;
}
}
for (i = 0; i <= GLFW_GAMEPAD_AXIS_LAST; i++)
{
if (!isValidElementForJoystick(mapping->axes + i, js))
{
_glfwInputError(GLFW_INVALID_VALUE,
"Invalid axis in gamepad mapping %s (%s)",
mapping->guid,
mapping->name);
return NULL;
}
}
}
return mapping;
}
// Parses an SDL_GameControllerDB line and adds it to the mapping list
//
static GLFWbool parseMapping(_GLFWmapping* mapping, const char* string)
@ -318,9 +370,9 @@ _GLFWjoystick* _glfwAllocJoystick(const char* name,
js->axisCount = axisCount;
js->buttonCount = buttonCount;
js->hatCount = hatCount;
js->mapping = findMapping(guid);
strcpy(js->guid, guid);
js->mapping = findValidMapping(js);
return js;
}
@ -973,7 +1025,7 @@ GLFWAPI int glfwUpdateGamepadMappings(const char* string)
{
_GLFWjoystick* js = _glfw.joysticks + jid;
if (js->present)
js->mapping = findMapping(js->guid);
js->mapping = findValidMapping(js);
}
return GLFW_TRUE;