Add ktx

2026-06-14 19:09:18 +01:00
parent 14bd1a9271
commit 13fa90a0e9
3958 changed files with 999286 additions and 4 deletions
@@ -0,0 +1,55 @@
+#include "helpers.h"
+
+#include <cassert>
+#include <cstdio>
+
+void dprintf(char* const fmt, ...) {
+#ifdef _DEBUG
+	va_list  args;
+	char buf[256];
+	va_start(args, fmt);
+	int len = vsnprintf_s(buf, sizeof buf, fmt, args);
+	va_end  (args);
+	if (len > 0) {
+		buf[sizeof buf - 1] = 0;
+		OutputDebugStringA(buf);
+	}
+#endif
+}
+
+HBITMAP rgbToBitmap(const uint32_t* src, uint32_t const imgW, uint32_t const imgH, bool const flip) {
+	/*
+	 * Creates a bitmap (a DIB) for the passed-in pixel size. Note that
+	 * negation of the height means top-down, origin upper-left, which is the
+	 * regular case.
+	 * 
+	 * TODO: 16-bit variant instead?
+	 */
+	assert(src && imgW && imgH);
+	BITMAPINFO bmi = {
+		sizeof(bmi.bmiHeader)
+	};
+	bmi.bmiHeader.biWidth  =          imgW;
+	bmi.bmiHeader.biHeight = (flip) ? imgH : -static_cast<int32_t>(imgH);
+	bmi.bmiHeader.biPlanes = 1;
+	bmi.bmiHeader.biBitCount = 32;
+	bmi.bmiHeader.biCompression = BI_RGB;
+	void* pixels = NULL;
+	HBITMAP hbmp = CreateDIBSection(NULL, &bmi, DIB_RGB_COLORS, &pixels, NULL, 0);
+	/*
+	 * RGBA to BGRA conversion.
+	 * 
+	 * Note: we keep the alpha.
+	 */
+	if (hbmp && pixels) {
+		uint32_t* dst = static_cast<uint32_t*>(pixels);
+		for (unsigned xy = imgW * imgH; xy > 0; xy--) {
+			uint32_t rgba = *src++;
+			*dst++ = ((rgba & 0x000000FF) << 16)
+				   | ((rgba & 0xFF00FF00)      )
+				   | ((rgba & 0x00FF0000) >> 16);
+		}
+		GdiFlush();
+	}
+	return hbmp;
+}