learnOpenGL/Resource.cpp at master · 0kk470/learnOpenGL · GitHub

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#include "Resource.h"
GLuint Resource::LoadTexture(const GLchar* path, GLint wrapMode, GLint MagFilterMode, GLint MinFilterMode)
{
	GLuint textureID;
	glGenTextures(1, &textureID);
	glBindTexture(GL_TEXTURE_2D, textureID);

	//float borderColor[] = { 1.0f, 0.6f, 0.6f, 1.0f };
	//glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapMode);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapMode);

	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, MagFilterMode);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, MinFilterMode);

	int width, height, nrChannels;
	unsigned char* data = stbi_load(path, &width, &height, &nrChannels, 0);
	if (data)
	{
		GLenum format;
		if (nrChannels == 1)
			format = GL_RED;
		else if (nrChannels == 3)
			format = GL_RGB;
		else if (nrChannels == 4)
			format = GL_RGBA;

		glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, data);
		glGenerateMipmap(GL_TEXTURE_2D);
	}
	else
	{
		std::cout << "Failed to load texture" << std::endl;
	}
	stbi_image_free(data);
	glBindTexture(GL_TEXTURE_2D, 0);
	return textureID;
}

GLuint Resource::LoadTextureFromAssImp(const aiTexture* aiTex, GLint wrapMode, GLint MagFilterMode, GLint MinFilterMode)
{
	if (aiTex == nullptr)
		return 0;
	GLuint textureID = 0;
	glGenTextures(1, &textureID);
	glBindTexture(GL_TEXTURE_2D, textureID);

	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, wrapMode);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, wrapMode);

	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, MagFilterMode);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, MinFilterMode);


	int width, height, nrChannels;
	unsigned char* image_data = nullptr;
	if (aiTex->mHeight == 0)
	{
		image_data = stbi_load_from_memory(reinterpret_cast<unsigned char*>(aiTex->pcData), aiTex->mWidth, &width, &height, &nrChannels, 0);
	}
	else
	{
		image_data = stbi_load_from_memory(reinterpret_cast<unsigned char*>(aiTex->pcData), aiTex->mWidth * aiTex->mHeight, &width, &height, &nrChannels, 0);
	}

	if (image_data != nullptr)
	{
		GLenum format;
		if (nrChannels == 1)
			format = GL_RED;
		else if (nrChannels == 3)
			format = GL_RGB;
		else if (nrChannels == 4)
			format = GL_RGBA;
		glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, format, GL_UNSIGNED_BYTE, image_data);
	}

	glGenerateMipmap(GL_TEXTURE_2D);
	return textureID;
}