Added win32 samples (first pass)

examples/win32_gdi/build.ps1

@@ -0,0 +1,4 @@
+
+# to build this, install mingw
+
+gcc main.c -ggdb -omain -lgdi32 -lmingw32 # -mwindows # comment -mwindows out for console output

examples/win32_gdi/main.c

@@ -0,0 +1,222 @@
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <windowsx.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <math.h>
+
+#include "clay_renderer_gdi.c"
+
+#define CLAY_IMPLEMENTATION
+#include "../clay/clay.h"
+
+#include "../shared-layouts/clay-video-demo.c"
+
+ClayVideoDemo_Data demo_data;
+
+#define APPNAME "Clay GDI Example"
+char szAppName[] = APPNAME; // The name of this application
+char szTitle[] = APPNAME;   // The title bar text
+
+void CenterWindow(HWND hWnd);
+
+long lastMsgTime = 0;
+bool ui_debug_mode;
+
+LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
+{
+
+    switch (message)
+    {
+
+    // ----------------------- first and last
+    case WM_CREATE:
+        CenterWindow(hwnd);
+        break;
+
+    case WM_DESTROY:
+        PostQuitMessage(0);
+        break;
+
+    case WM_MOUSEWHEEL: // scrolling data
+    {
+        short zDelta = GET_WHEEL_DELTA_WPARAM(wParam);
+        // todo: i think GetMessageTime can roll over, so something like if(lastmsgtime > now) ... may be needed
+        long now = GetMessageTime();
+        float dt = (now - lastMsgTime) / 1000.00;
+
+        lastMsgTime = now;
+
+        // little hacky hack to make scrolling *feel* right
+        if (abs(zDelta) > 100)
+        {
+            zDelta = zDelta * .012;
+        }
+
+        Clay_UpdateScrollContainers(true, (Clay_Vector2){.x = 0, .y = zDelta}, dt);
+
+        InvalidateRect(hwnd, NULL, false); // force a wm_paint event
+        break;
+    }
+    case WM_RBUTTONUP:
+    case WM_LBUTTONUP:
+    case WM_LBUTTONDOWN:
+    case WM_RBUTTONDOWN:
+    case WM_MOUSEMOVE: // mouse events
+    {
+        short mouseX = GET_X_LPARAM(lParam);
+        short mouseY = GET_Y_LPARAM(lParam);
+        short mouseButtons = LOWORD(wParam);
+
+        Clay_SetPointerState((Clay_Vector2){mouseX, mouseY}, mouseButtons & 0b01);
+
+        InvalidateRect(hwnd, NULL, false); // force a wm_paint event
+        break;
+    }
+
+    case WM_SIZE: // resize events
+    {
+
+        RECT r = {0};
+        if (GetClientRect(hwnd, &r))
+        {
+            Clay_Dimensions dim = (Clay_Dimensions){.height = r.bottom - r.top, .width = r.right - r.left};
+            Clay_SetLayoutDimensions(dim);
+        }
+
+        InvalidateRect(hwnd, NULL, false); // force a wm_paint event
+
+        break;
+    }
+
+    case WM_KEYDOWN:
+        if (VK_ESCAPE == wParam)
+        {
+            DestroyWindow(hwnd);
+            break;
+        }
+
+        if (wParam == VK_F12)
+        {
+            Clay_SetDebugModeEnabled(ui_debug_mode = !ui_debug_mode);
+            break;
+        }
+
+        printf("Key Pressed: %d\r\n", wParam);
+        InvalidateRect(hwnd, NULL, false); // force a wm_paint event
+        break;
+
+    // ----------------------- render
+    case WM_PAINT:
+    {
+        Clay_RenderCommandArray renderCommands = ClayVideoDemo_CreateLayout(&demo_data);
+        Clay_Win32_Render(hwnd, renderCommands);
+        break;
+    }
+
+    // ----------------------- let windows do all other stuff
+    default:
+        return DefWindowProc(hwnd, message, wParam, lParam);
+    }
+    return 0;
+}
+
+bool didAllocConsole = false;
+
+void HandleClayErrors(Clay_ErrorData errorData)
+{
+    if (!didAllocConsole)
+    {
+        didAllocConsole = AllocConsole();
+    }
+
+    printf("Handle Clay Errors: %s\r\n", errorData.errorText.chars);
+}
+
+int APIENTRY WinMain(
+    HINSTANCE hInstance,
+    HINSTANCE hPrevInstance,
+    LPSTR lpCmdLine,
+    int nCmdShow)
+{
+    MSG msg;
+    WNDCLASS wc;
+    HWND hwnd;
+
+    demo_data = ClayVideoDemo_Initialize();
+
+    uint64_t clayRequiredMemory = Clay_MinMemorySize();
+    Clay_Arena clayMemory = Clay_CreateArenaWithCapacityAndMemory(clayRequiredMemory, malloc(clayRequiredMemory));
+    Clay_Initialize(clayMemory, (Clay_Dimensions){.width = 800, .height = 600}, (Clay_ErrorHandler){HandleClayErrors}); // This final argument is new since the video was published
+
+    // Font fonts[1];
+    // fonts[FONT_ID_BODY_16] = LoadFontEx("resources/Roboto-Regular.ttf", 48, 0, 400);
+
+    Clay_SetMeasureTextFunction(Clay_Win32_MeasureText, NULL); // was gettings fonts[] passed in
+
+    ZeroMemory(&wc, sizeof wc);
+    wc.hInstance = hInstance;
+    wc.lpszClassName = szAppName;
+    wc.lpfnWndProc = (WNDPROC)WndProc;
+    wc.style = CS_DBLCLKS | CS_VREDRAW | CS_HREDRAW;
+    wc.hbrBackground = (HBRUSH)GetStockObject(BLACK_BRUSH);
+    wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
+    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
+
+    if (FALSE == RegisterClass(&wc))
+        return 0;
+
+
+    hwnd = CreateWindow(
+        szAppName,
+        szTitle,
+        WS_OVERLAPPEDWINDOW | WS_VISIBLE,
+        CW_USEDEFAULT,
+        CW_USEDEFAULT,
+        800, // CW_USEDEFAULT,
+        600, // CW_USEDEFAULT,
+        0,
+        0,
+        hInstance,
+        0);
+
+    if (hwnd == NULL)
+        return 0;
+
+    // Main message loop:
+    while (GetMessage(&msg, NULL, 0, 0) > 0)
+    {
+        TranslateMessage(&msg);
+        DispatchMessage(&msg);
+    }
+
+    return msg.wParam;
+}
+
+void CenterWindow(HWND hwnd_self)
+{
+    HWND hwnd_parent;
+    RECT rw_self, rc_parent, rw_parent;
+    int xpos, ypos;
+
+    hwnd_parent = GetParent(hwnd_self);
+    if (NULL == hwnd_parent)
+        hwnd_parent = GetDesktopWindow();
+
+    GetWindowRect(hwnd_parent, &rw_parent);
+    GetClientRect(hwnd_parent, &rc_parent);
+    GetWindowRect(hwnd_self, &rw_self);
+
+    xpos = rw_parent.left + (rc_parent.right + rw_self.left - rw_self.right) / 2;
+    ypos = rw_parent.top + (rc_parent.bottom + rw_self.top - rw_self.bottom) / 2;
+
+    SetWindowPos(
+        hwnd_self, NULL,
+        xpos, ypos, 0, 0,
+        SWP_NOSIZE | SWP_NOZORDER | SWP_NOACTIVATE);
+}
+
+//+---------------------------------------------------------------------------