helpers.cpp

#include "helpers.h"
#include "stb/stb_image.h"

int loadTexture(GLuint tex, GLint repeat, const char* file)
{
	int res = -1;

	int width, height, nrChannels;
	unsigned char* data;
	data = stbi_load(file, &width, &height, &nrChannels, 0);
	
	if (data)
	{
		glBindTexture(GL_TEXTURE_2D, tex);

		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, repeat);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, repeat);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, (nrChannels == 4 ? GL_RGBA : GL_RGB), GL_UNSIGNED_BYTE, data);
		glGenerateMipmap(GL_TEXTURE_2D);

		if (repeat == GL_CLAMP_TO_BORDER)
		{
			float borderColor[] = { 1.0f, 1.0f, 0.0f, 1.0f };
			glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor); //use this for GL_CLAMP_TO_BORDER
		}

		stbi_image_free(data);

		res = 0;
	}

	return res;
}