From f33cd3a03ceaceda089e8ef658650e52a70938a4 Mon Sep 17 00:00:00 2001
From: kkard2 <contact@kkard2.com>
Date: Mon, 1 Sep 2025 20:17:51 +0200
Subject: init

---
 .gitignore       |   2 +
 platform_win32.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 run.bat          |   3 ++
 softrender.h     |  35 +++++++++++++++++
 4 files changed, 155 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 platform_win32.c
 create mode 100644 run.bat
 create mode 100644 softrender.h

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d969f6b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+*.exe
+*.obj
diff --git a/platform_win32.c b/platform_win32.c
new file mode 100644
index 0000000..7ebd16c
--- /dev/null
+++ b/platform_win32.c
@@ -0,0 +1,115 @@
+#define UNICODE
+#include <windows.h>
+
+#define SOFTRENDER_IMPLEMENTATION
+#include "softrender.h"
+
+// TODO(kard): ofc some resizing stuff
+#define WIDTH 256
+#define HEIGHT 256
+
+static uint32_t pixel_buffer[WIDTH * HEIGHT];
+
+LRESULT WindowProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam) {
+    switch (uMsg) {
+        case WM_DESTROY: {
+            PostQuitMessage(0);
+            return 0;
+        }
+        default:
+            return DefWindowProc(hwnd, uMsg, wParam, lParam);
+    }
+}
+
+int WinMain(
+    HINSTANCE hInstance,
+    HINSTANCE hPrevInstance,
+    LPSTR     lpCmdLine,
+    int       nShowCmd
+) {
+    const wchar_t CLASS_NAME[]  = L"softrender";
+
+    WNDCLASS wc = { 0 };
+
+    wc.lpfnWndProc   = WindowProc;
+    wc.hInstance     = hInstance;
+    wc.lpszClassName = CLASS_NAME;
+
+    RegisterClass(&wc);
+
+    HWND hwnd = CreateWindowEx(
+        0,
+        CLASS_NAME,
+        L"softrender",
+        WS_OVERLAPPED | WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX, // bla bla you can't resize window basically
+        CW_USEDEFAULT, CW_USEDEFAULT, WIDTH, HEIGHT,
+        NULL,
+        NULL,
+        hInstance,
+        NULL
+    );
+
+    if (hwnd == NULL)
+        return 1;
+
+    ShowWindow(hwnd, nShowCmd);
+
+    BITMAPINFO bmi;
+    ZeroMemory(&bmi, sizeof(bmi));
+    bmi.bmiHeader.biSize        = sizeof(BITMAPINFOHEADER);
+    bmi.bmiHeader.biWidth       = WIDTH;
+    bmi.bmiHeader.biHeight      = -HEIGHT; // negative = top-down
+    bmi.bmiHeader.biPlanes      = 1;
+    bmi.bmiHeader.biBitCount    = 32;
+    bmi.bmiHeader.biCompression = BI_RGB;
+
+    soft_Canvas canvas = {
+        .pixels = pixel_buffer,
+        .width = WIDTH,
+        .height = HEIGHT,
+        .stride = WIDTH,
+    };
+
+    MSG msg = {0};
+    BOOL running = TRUE;
+
+    while (running) {
+        while (PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) {
+            if (msg.message == WM_QUIT) {
+                running = FALSE;
+                break;
+            }
+
+            TranslateMessage(&msg);
+            DispatchMessage(&msg);
+        }
+
+        if (!running) break;
+
+
+        // NOTE(kard): ACTUAL RENDERING CODE HERE !!!
+        soft_clear(canvas, 0xFF000000);
+        soft_draw_rect(canvas, 80, 70, 80 + 20, 70 + 40, 0xFFFF00FF);
+        soft_draw_rect(canvas, 140, 70, 140 + 20, 70 + 40, 0xFFFF00FF);
+
+
+        HDC hdc = GetDC(hwnd);
+        StretchDIBits(
+            hdc,
+            0, 0, WIDTH, HEIGHT, // dest rectangle
+            0, 0, WIDTH, HEIGHT, // src rectangle
+            pixel_buffer,
+            &bmi,
+            DIB_RGB_COLORS,
+            SRCCOPY
+        );
+
+        InvalidateRect(hwnd, NULL, FALSE);
+        UpdateWindow(hwnd);
+
+        // TODO(kard): proper frame limiting
+        Sleep(16);
+    }
+
+    return (int) msg.wParam;
+}
diff --git a/run.bat b/run.bat
new file mode 100644
index 0000000..f6cf655
--- /dev/null
+++ b/run.bat
@@ -0,0 +1,3 @@
+del platform_win32.exe
+cl platform_win32.c user32.lib gdi32.lib
+platform_win32.exe
diff --git a/softrender.h b/softrender.h
new file mode 100644
index 0000000..e417ab2
--- /dev/null
+++ b/softrender.h
@@ -0,0 +1,35 @@
+#include <stdint.h>
+
+typedef struct {
+    // TODO(kard): define byte order
+    uint32_t *pixels;
+    uint32_t width;
+    uint32_t height;
+    uint32_t stride;
+} soft_Canvas;
+
+void soft_clear(soft_Canvas c, uint32_t color);
+void soft_draw_rect(soft_Canvas c, uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, uint32_t color);
+
+// TODO(kard): prefix stripping
+
+#ifdef SOFTRENDER_IMPLEMENTATION
+
+void soft_clear(soft_Canvas c, uint32_t color) {
+    soft_draw_rect(c, 0, 0, c.width - 1, c.height - 1, color);
+}
+
+// TODO(kard): probably bounds checking
+// TODO(kard): alpha blending maybe
+void soft_draw_rect(soft_Canvas c, uint32_t x0, uint32_t y0, uint32_t x1, uint32_t y1, uint32_t color) {
+    uint32_t *row = c.pixels + (y0 * c.stride);
+
+    for (uint32_t y = y0; y <= y1; y++, row += c.stride) {
+        for (uint32_t x = x0; x <= x1; x++) {
+            row[x] = color;
+        }
+    }
+}
+
+#endif // SOFTRENDER_IMPLEMENTATION
+
-- 
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