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lovr-mouse.lua
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lovr-mouse.lua
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assert(type(jit) == 'table' and lovr.system.getOS() ~= 'Android', 'lovr-mouse cannot run on this platform')
local ffi = require 'ffi'
local C = ffi.os == 'Windows' and ffi.load('glfw3') or ffi.C
ffi.cdef [[
enum {
GLFW_CURSOR = 0x00033001,
GLFW_CURSOR_NORMAL = 0x00034001,
GLFW_CURSOR_HIDDEN = 0x00034002,
GLFW_CURSOR_DISABLED = 0x00034003,
GLFW_ARROW_CURSOR = 0x00036001,
GLFW_IBEAM_CURSOR = 0x00036002,
GLFW_CROSSHAIR_CURSOR = 0x00036003,
GLFW_HAND_CURSOR = 0x00036004,
GLFW_HRESIZE_CURSOR = 0x00036005,
GLFW_VRESIZE_CURSOR = 0x00036006
};
typedef struct {
int width;
int height;
unsigned char* pixels;
} GLFWimage;
typedef struct GLFWcursor GLFWcursor;
typedef struct GLFWwindow GLFWwindow;
typedef void(*GLFWmousebuttonfun)(GLFWwindow*, int, int, int);
typedef void(*GLFWcursorposfun)(GLFWwindow*, double, double);
typedef void(*GLFWscrollfun)(GLFWwindow*, double, double);
GLFWwindow* os_get_glfw_window(void);
void glfwGetInputMode(GLFWwindow* window, int mode);
void glfwSetInputMode(GLFWwindow* window, int mode, int value);
void glfwGetCursorPos(GLFWwindow* window, double* x, double* y);
void glfwSetCursorPos(GLFWwindow* window, double x, double y);
GLFWcursor* glfwCreateCursor(const GLFWimage* image, int xhot, int yhot);
GLFWcursor* glfwCreateStandardCursor(int kind);
void glfwSetCursor(GLFWwindow* window, GLFWcursor* cursor);
int glfwGetMouseButton(GLFWwindow* window, int button);
void glfwGetWindowSize(GLFWwindow* window, int* width, int* height);
GLFWmousebuttonfun glfwSetMouseButtonCallback(GLFWwindow* window, GLFWmousebuttonfun callback);
GLFWcursorposfun glfwSetCursorPosCallback(GLFWwindow* window, GLFWcursorposfun callback);
GLFWcursorposfun glfwSetScrollCallback(GLFWwindow* window, GLFWscrollfun callback);
]]
local window = ffi.C.os_get_glfw_window()
local mouse = {}
-- LÖVR uses framebuffer scale for everything, but glfw uses window scale for events.
-- It is necessary to convert between the two at all boundaries.
function mouse.getScale()
local x, _ = ffi.new('int[1]'), ffi.new('int[1]')
C.glfwGetWindowSize(window, x, _)
return lovr.system.getWindowWidth() / x[0]
end
function mouse.getX()
local x = ffi.new('double[1]')
C.glfwGetCursorPos(window, x, nil)
return x[0] * mouse.getScale()
end
function mouse.getY()
local y = ffi.new('double[1]')
C.glfwGetCursorPos(window, nil, y)
return y[0] * mouse.getScale()
end
function mouse.getPosition()
local x, y = ffi.new('double[1]'), ffi.new('double[1]')
local scale = mouse.getScale()
C.glfwGetCursorPos(window, x, y)
return x[0] * scale, y[0] * scale
end
function mouse.setX(x)
local y = mouse.getY()
local scale = mouse.getScale()
C.glfwSetCursorPos(window, x / scale, y / scale)
end
function mouse.setY(y)
local x = mouse.getX()
local scale = mouse.getScale()
C.glfwSetCursorPos(window, x / scale, y / scale)
end
function mouse.setPosition(x, y)
local scale = mouse.getScale()
C.glfwSetCursorPos(window, x / scale, y / scale)
end
function mouse.isDown(button, ...)
if not button then return false end
return C.glfwGetMouseButton(window, button - 1) > 0 or mouse.isDown(...)
end
function mouse.getRelativeMode()
return C.glfwGetInputMode(window, C.GLFW_CURSOR) == C.GLFW_CURSOR_DISABLED
end
function mouse.setRelativeMode(enable)
C.glfwSetInputMode(window, C.GLFW_CURSOR, enable and C.GLFW_CURSOR_DISABLED or C.GLFW_CURSOR_NORMAL)
end
function mouse.newCursor(source, hotx, hoty)
if type(source) == 'string' or tostring(source) == 'Blob' then
source = lovr.data.newImage(source, false)
else
assert(tostring(source) == 'Image', 'Bad argument #1 to newCursor (Image expected)')
end
local image = ffi.new('GLFWimage', source:getWidth(), source:getHeight(), source:getPointer())
return C.glfwCreateCursor(image, hotx or 0, hoty or 0)
end
function mouse.getSystemCursor(kind)
local kinds = {
arrow = C.GLFW_ARROW_CURSOR,
ibeam = C.GLFW_IBEAM_CURSOR,
crosshair = C.GLFW_CROSSHAIR_CURSOR,
hand = C.GLFW_HAND_CURSOR,
sizewe = C.GLFW_HRESIZE_CURSOR,
sizens = C.GLFW_VRESIZE_CURSOR
}
assert(kinds[kind], string.format('Unknown cursor %q', tostring(kind)))
return C.glfwCreateStandardCursor(kinds[kind])
end
function mouse.setCursor(cursor)
C.glfwSetCursor(window, cursor)
end
C.glfwSetMouseButtonCallback(window, function(target, button, action, mods)
if target == window then
local x, y = mouse.getPosition()
lovr.event.push(action > 0 and 'mousepressed' or 'mousereleased', x, y, button + 1, false)
end
end)
local px, py = mouse.getPosition()
C.glfwSetCursorPosCallback(window, function(target, x, y)
if target == window then
local scale = mouse.getScale()
x = x * scale
y = y * scale
lovr.event.push('mousemoved', x, y, x - px, y - py, false)
px, py = x, y
end
end)
C.glfwSetScrollCallback(window, function(target, x, y)
if target == window then
local scale = mouse.getScale()
lovr.event.push('wheelmoved', x * scale, y * scale)
end
end)
return mouse