Added an asynchronous resource loading mechanism through App_GetResourcePath and App_ResourceLoaded. Added stb_image.h and used it to parse a .png file loaded from the server and upload it to app.testTexture. There is some ugliness around the edges images with transparency, probably caused by something pre-multiplied alpha related.

cwasm.c

@@ -18,6 +18,18 @@ Description:
 #include "cwasm_webgl_js_imports.h"
 #include "cwasm_webgl_constants.h"
 
+#define STB_IMAGE_IMPLEMENTATION
+#define STBIDEF static
+#define STBI_NO_STDIO
+#define STBI_ASSERT(expression)                         Assert(expression)
+#define STBI_MALLOC(numBytes)                           AllocMem(&ScratchArenas[0], numBytes)
+#define STBI_REALLOC_SIZED(allocPntr, oldSize, newSize) ReallocMem(&ScratchArenas[0], (allocPntr), (oldSize), (newSize))
+#define STBI_FREE(allocPntr)                            //nothing TODO: Once we have a general purpose arena we can implement this!
+#define STBI_NO_SIMD
+#define STBI_ONLY_PNG
+#define STBI_NO_THREAD_LOCALS
+#include "stb_image.h"
+
 void InitializeCWasm(u32 scratchArenasSize)
 {
 	InitGlobalArenas(scratchArenasSize);
@@ -30,3 +42,18 @@ WASM_EXPORT(cAllocMem) void* cAllocMem(Arena* arenaPntr, int numBytes, int align
 	Assert(alignment >= 0);
 	return AllocMemAligned(arenaPntr, (u32)numBytes, (u32)alignment);
 }
+
+WASM_EXPORT(cGetScratchArenaPntr) Arena* cGetScratchArenaPntr(Arena* conflictArenaPntr)
+{
+	ArenaMark scratchMark = GetScratch1(conflictArenaPntr);
+	return scratchMark.arena;
+}
+WASM_EXPORT(cGetScratchArenaMark) u32 cGetScratchArenaMark(Arena* conflictArenaPntr)
+{
+	ArenaMark scratchMark = GetScratch1(conflictArenaPntr);
+	return scratchMark.mark;
+}
+WASM_EXPORT(cEndScratchArena) void cEndScratchArena(Arena* arenaPntr, u32 mark)
+{
+	ResetToMark(arenaPntr, mark);
+}