add updating to textures

src/sdlrenderer_texture_uploader.cpp

@@ -1,13 +1,15 @@
 #include "./sdlrenderer_texture_uploader.hpp"
 
 #include <cassert>
+#include <cstdint>
+#include <cstring>
 
 SDLRendererTextureUploader::SDLRendererTextureUploader(SDL_Renderer* renderer_) :
 	renderer(renderer_)
 {
 }
 
-uint64_t SDLRendererTextureUploader::uploadRGBA(const uint8_t* data, uint32_t width, uint32_t height, Filter filter) {
+uint64_t SDLRendererTextureUploader::uploadRGBA(const uint8_t* data, uint32_t width, uint32_t height, Filter filter, Access access) {
 	// TODO: test if pitch is 4 or 4*width
 	SDL_Surface* surf = SDL_CreateSurfaceFrom(
 		(void*)data,
@@ -17,6 +19,14 @@ uint64_t SDLRendererTextureUploader::uploadRGBA(const uint8_t* data, uint32_t wi
 	);
 	assert(surf); // TODO: add error reporting
 
+	// hacky hint usage
+	if (access == Access::STREAMING) {
+		SDL_SetHint("SDL_TextureAccess", "SDL_TEXTUREACCESS_STREAMING");
+	} else {
+		SDL_SetHint("SDL_TextureAccess", "SDL_TEXTUREACCESS_STATIC");
+	}
+	// TODO: cleanup hints after
+
 	SDL_Texture* tex = SDL_CreateTextureFromSurface(renderer, surf);
 	assert(tex); // TODO: add error reporting
 
@@ -31,6 +41,27 @@ uint64_t SDLRendererTextureUploader::uploadRGBA(const uint8_t* data, uint32_t wi
 	return reinterpret_cast<uint64_t>(tex);
 }
 
+bool SDLRendererTextureUploader::updateRGBA(uint64_t tex_id, const uint8_t* data, size_t size) {
+	auto* texture = static_cast<SDL_Texture*>(reinterpret_cast<void*>(tex_id));
+	if (texture == nullptr) {
+		return false;
+	}
+
+	uint8_t* pixels = nullptr;
+	int pitch = 0;
+
+	if (SDL_LockTexture(texture, nullptr, (void**)&pixels, &pitch) != 0) {
+		// TODO: error
+		return false;
+	}
+
+	std::memcpy(pixels, data, size);
+
+	SDL_UnlockTexture(texture);
+
+	return true;
+}
+
 void SDLRendererTextureUploader::destroy(uint64_t tex_id) {
 	SDL_DestroyTexture(static_cast<SDL_Texture*>(reinterpret_cast<void*>(tex_id)));
 }