Work on moving infrastruture to this project

1 files changed, 99 insertions, 0 deletions

diff --git a/source/Texture.cpp b/source/Texture.cpp
new file mode 100644
index 0000000..968c4bc
--- /dev/null
+++ b/source/Texture.cpp
@@ -0,0 +1,99 @@
+#include "Texture.hpp"
+
+#include "PodVector.hpp"
+
+#include <stb_image.h>
+#include <stb_rect_pack.h>
+#include <cstdint>
+#include <cstring>
+#include <deque>
+#include <filesystem>
+#include <fstream>
+#include <stdexcept>
+#include <utility>
+
+Texture::~Texture() {
+	glDeleteTextures(1, &mHandle);
+}
+
+static GLenum MapTextureFilteringToGL(Texture::Filtering option) {
+	switch (option) {
+		case Texture::LinearFilter: return GL_LINEAR;
+		case Texture::NearestFilter: return GL_NEAREST;
+	}
+	return 0;
+}
+
+bool Texture::InitFromFile(const char* filePath, const TextureProperties& props, bool flipVertically) {
+	int width, height;
+	int channels;
+
+	stbi_set_flip_vertically_on_load(flipVertically);
+	auto result = (uint8_t*)stbi_load(filePath, &width, &height, &channels, 4);
+	if (!result) {
+		return false;
+	}
+
+	glDeleteTextures(1, &mHandle); // In case the caller gave us
+	glGenTextures(1, &mHandle);
+	glBindTexture(GL_TEXTURE_2D, mHandle);
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, ::MapTextureFilteringToGL(props.minifyingFilter));
+	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, ::MapTextureFilteringToGL(props.magnifyingFilter));
+	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, result);
+
+	mInfo.size = { width, height };
+	mInfo.isAtlas = false;
+	return true;
+}
+
+// bool Texture::InitFromImage(const Image& image, const TextureProperties& props, bool flipVertically) {
+// 	GLenum sourceFormat;
+// 	switch (image.GetChannels()) {
+// 		case 1: sourceFormat = GL_RED; break;
+// 		case 2: sourceFormat = GL_RG; break;
+// 		case 3: sourceFormat = GL_RGB; break;
+// 		case 4: sourceFormat = GL_RGBA; break;
+// 		default: return false;
+// 	}
+
+// 	auto size = image.GetSize();
+
+// 	std::unique_ptr<uint8_t[]> dataStorage;
+// 	uint8_t* dataPtr;
+// 	if (flipVertically) {
+// 		dataStorage = std::make_unique<uint8_t[]>(image.GetDataLength());
+// 		dataPtr = dataStorage.get();
+
+// 		size_t rowStride = size.width * image.GetChannels() * sizeof(uint8_t);
+// 		for (size_t y = 0; y < size.height; ++y) {
+// 			size_t invY = (size.height - 1) - y;
+// 			std::memcpy(dataPtr + invY * rowStride, image.GetDataPtr() + y * rowStride, rowStride);
+// 		}
+// 	} else {
+// 		// dataStorage is unused, we read pixels directly from `image`
+// 		dataPtr = image.GetDataPtr();
+// 	}
+
+// 	glDeleteTextures(1, &mHandle);
+// 	glGenTextures(1, &mHandle);
+// 	glBindTexture(GL_TEXTURE_2D, mHandle);
+// 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, ::MapTextureFilteringToGL(props.minifyingFilter));
+// 	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, ::MapTextureFilteringToGL(props.magnifyingFilter));
+// 	glTexImage2D(GL_TEXTURE_2D, 0, sourceFormat, size.width, size.height, 0, sourceFormat, GL_UNSIGNED_BYTE, dataPtr);
+
+// 	mInfo.size = size;
+// 	mInfo.isAtlas = false;
+// 	return true;
+// }
+
+const TextureInfo& Texture::GetInfo() const {
+	return mInfo;
+}
+
+GLuint Texture::GetHandle() const {
+	return mHandle;
+}
+
+bool Texture::IsValid() const {
+	return mHandle != 0;
+}