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/*
* Copyright 2023 The Emscripten Authors. All rights reserved.
* Emscripten is available under two separate licenses, the MIT license and the
* University of Illinois/NCSA Open Source License. Both these licenses can be
* found in the LICENSE file.
*/
#include <GLFW/glfw3.h>
#include <stdio.h>
#include <assert.h>
#include <string.h>
#include <stdbool.h>
#include <emscripten/html5.h>
// installing mock devicePixelRatio (independent of the browser/screen resolution)
static void installMockDevicePixelRatio() {
printf("installing mock devicePixelRatio...\n");
EM_ASM(
GLFW.mockDevicePixelRatio = 1.0;
GLFW.getDevicePixelRatio = () => { console.log("mock getDevicePixelRatio"); return GLFW.mockDevicePixelRatio; };
);
}
static void setDevicePixelRatio(float ratio) {
printf("setDevicePixelRatio %.0f\n", ratio);
EM_ASM({
GLFW.mockDevicePixelRatio = $0;
// mocking/simulating the fact that an event should be raised when devicePixelRatio changes
if (GLFW.devicePixelRatioMQL) {
GLFW.onDevicePixelRatioChange();
}
}, ratio);
}
static void setGLFWIsHiDPIAware(GLFWwindow *window, bool isHiDPIAware) {
printf("setGLFWIsHiDPIAware %s\n", isHiDPIAware ? "true" : "false");
glfwSetWindowAttrib(window, GLFW_SCALE_TO_MONITOR, isHiDPIAware ? GLFW_TRUE : GLFW_FALSE);
}
static void checkWindowSize(GLFWwindow *window, int expectedWidth, int expectedHeight, float ratio) {
// first check the window size
int w, h;
glfwGetWindowSize(window, &w, &h);
printf("windowSize => %d == %d && %d == %d\n", w, expectedWidth, h, expectedHeight);
assert(w == expectedWidth && h == expectedHeight);
// second check the frame buffer size
int fbw, fbh;
glfwGetFramebufferSize(window, &fbw, &fbh);
printf("framebufferSize => %d == %d && %d == %d\n", fbw, (int) (expectedWidth * ratio), fbh, (int) (expectedHeight * ratio));
assert(fbw == (int) (expectedWidth * ratio) && fbh == (int) (expectedHeight * ratio));
}
static bool getGLFWIsHiDPIAware() {
return EM_ASM_INT(return GLFW.isHiDPIAware() ? 1 : 0) != 0;
}
static void checkHiDPIAware(GLFWwindow *window, bool expectedAwareness) {
assert(getGLFWIsHiDPIAware() == expectedAwareness);
assert(glfwGetWindowAttrib(window, GLFW_SCALE_TO_MONITOR) == (expectedAwareness ? GLFW_TRUE : GLFW_FALSE));
}
int main() {
GLFWwindow* window;
assert(glfwInit() == GL_TRUE);
installMockDevicePixelRatio();
// by default, GLFW is NOT Hi DPI aware
assert(!getGLFWIsHiDPIAware());
// Use case 1: GLFW is NOT Hi DPI Aware | devicePixelRatio is 1.0
// Expected outcome is window size and frame buffer size are the same
{
printf("Use case #1\n");
window = glfwCreateWindow(640, 480, "test_glfw3_hi_dpi_aware.c | #1", NULL, NULL);
assert(window != NULL);
checkHiDPIAware(window, false);
checkWindowSize(window, 640, 480, 1.0);
glfwSetWindowSize(window, 600, 400);
checkWindowSize(window, 600, 400, 1.0);
glfwDestroyWindow(window);
}
// Use case 2: GLFW is NOT Hi DPI Aware | devicePixelRatio is 2.0
// Expected outcome is window size and frame buffer size are the same (because
// GLFW is not Hi DPI Aware)
{
printf("Use case #2\n");
setDevicePixelRatio(2.0);
window = glfwCreateWindow(640, 480, "test_glfw3_hi_dpi_aware.c | #2", NULL, NULL);
assert(window != NULL);
checkHiDPIAware(window, false);
checkWindowSize(window, 640, 480, 1.0);
glfwSetWindowSize(window, 600, 400);
checkWindowSize(window, 600, 400, 1.0);
glfwDestroyWindow(window);
}
// Use case 3: GLFW is Hi DPI Aware | devicePixelRatio is 1.0
// Expected outcome is window size and frame buffer size are the same
{
printf("Use case #3\n");
setDevicePixelRatio(1.0);
glfwWindowHint(GLFW_SCALE_TO_MONITOR, GLFW_TRUE);
window = glfwCreateWindow(640, 480, "test_glfw3_hi_dpi_aware.c | #3", NULL, NULL);
assert(window != NULL);
checkHiDPIAware(window, true);
checkWindowSize(window, 640, 480, 1.0);
glfwSetWindowSize(window, 600, 400);
checkWindowSize(window, 600, 400, 1.0);
glfwDestroyWindow(window);
}
// Use case 4: GLFW is Hi DPI Aware | devicePixelRatio is 2.0
// Expected outcome is frame buffer size is 2x window size
{
printf("Use case #4\n");
setDevicePixelRatio(2.0);
glfwWindowHint(GLFW_SCALE_TO_MONITOR, GLFW_TRUE);
window = glfwCreateWindow(640, 480, "test_glfw3_hi_dpi_aware.c | #4", NULL, NULL);
assert(window != NULL);
checkHiDPIAware(window, true);
checkWindowSize(window, 640, 480, 2.0);
glfwSetWindowSize(window, 600, 400);
checkWindowSize(window, 600, 400, 2.0);
glfwDestroyWindow(window);
}
// Use case 5: GLFW Hi DPI Awareness changes | devicePixelRatio 2.0
// Expected outcome is that the window sizes is adjusted automatically
{
printf("Use case #5\n");
glfwWindowHint(GLFW_SCALE_TO_MONITOR, GLFW_TRUE);
window = glfwCreateWindow(640, 480, "test_glfw3_hi_dpi_aware.c | #5", NULL, NULL);
assert(window != NULL);
checkHiDPIAware(window, true);
checkWindowSize(window, 640, 480, 2.0);
setGLFWIsHiDPIAware(window, false);
checkWindowSize(window, 640, 480, 1.0);
checkHiDPIAware(window, false);
glfwDestroyWindow(window);
}
// Use case 6: GLFW is NOT Hi DPI Aware | devicePixelRatio changes
// Expected outcome is that the window sizes does not change
{
printf("Use case #6\n");
setDevicePixelRatio(1.0);
glfwDefaultWindowHints(); // reset GLFW_SCALE_TO_MONITOR
window = glfwCreateWindow(640, 480, "test_glfw3_hi_dpi_aware.c | #6", NULL, NULL);
assert(window != NULL);
checkHiDPIAware(window, false);
checkWindowSize(window, 640, 480, 1.0);
setDevicePixelRatio(2.0);
checkWindowSize(window, 640, 480, 1.0);
glfwDestroyWindow(window);
}
// Use case 7: GLFW is Hi DPI Aware | devicePixelRatio changes
// Expected outcome is that the window sizes is adjusted automatically
{
printf("Use case #7\n");
setDevicePixelRatio(2.0);
glfwWindowHint(GLFW_SCALE_TO_MONITOR, GLFW_TRUE);
window = glfwCreateWindow(640, 480, "test_glfw3_hi_dpi_aware.c | #7", NULL, NULL);
assert(window != NULL);
checkHiDPIAware(window, true);
checkWindowSize(window, 640, 480, 2.0);
setDevicePixelRatio(1.0);
checkWindowSize(window, 640, 480, 1.0);
glfwDestroyWindow(window);
}
glfwTerminate();
return 0;
}
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