add texture routines

2 files changed, 93 insertions, 0 deletions

diff --git a/src/graphics/Texture.cpp b/src/graphics/Texture.cpp
new file mode 100644
index 0000000..561133e
--- /dev/null
+++ b/src/graphics/Texture.cpp
@@ -0,0 +1,77 @@
+#include <GL/glew.h>
+
+#define STB_IMAGE_IMPLEMENTATION
+#include "../stb_image.h"
+
+#include "Texture.hpp"
+
+Texture::Texture(int type) : target(type)
+{
+	glGenTextures(1, &texture_id);
+}
+
+Texture::~Texture()
+{
+	glDeleteTextures(1, &texture_id);
+}
+
+int Texture::LoadImage(const char *path)
+{
+	int width, height, nrChannels;
+	unsigned char *image;
+
+	glBindTexture(target, texture_id);
+
+		image = stbi_load(path, &width, &height, &nrChannels, 0);
+		if(!image)
+			return 1;
+
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB,
+			GL_UNSIGNED_BYTE, image);
+		stbi_image_free(image);
+
+		glGenerateMipmap(target);
+		glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_MIRRORED_REPEAT);
+		glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_MIRRORED_REPEAT);
+		glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+		glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+
+	glBindTexture(target, 0);
+	return 0;
+}
+
+int Texture::LoadImage(const char **paths)
+{
+	if(target != GL_TEXTURE_CUBE_MAP)
+		return 1;
+
+	int width, height, nrChannels;
+	unsigned int i;
+	unsigned char *image;
+
+	glBindTexture(target, texture_id);
+
+		for(i = 0; i < 6; i++) {
+			image = stbi_load(paths[i], &width, &height, &nrChannels, 0);
+			if(!image)
+				return 1;
+
+			glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i,
+				0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image);
+			stbi_image_free(image);
+		}
+
+		glTexParameteri(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+		glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+		glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+		glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+		glTexParameteri(target, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
+
+	glBindTexture(target, 0);
+	return 0;
+}
+
+void Texture::Bind()
+{
+	glBindTexture(target, texture_id);
+}
diff --git a/src/graphics/Texture.hpp b/src/graphics/Texture.hpp
new file mode 100644
index 0000000..02298f2
--- /dev/null
+++ b/src/graphics/Texture.hpp
@@ -0,0 +1,16 @@
+#ifndef ENGINE_TEXTURE_H
+#define ENGINE_TEXTURE_H
+
+class Texture {
+	int target;
+	unsigned int texture_id;
+public:
+	Texture(int type);
+	~Texture();
+
+	int LoadImage(const char *path);
+	int LoadImage(const char **paths);
+	void Bind();
+};
+
+#endif /* ENGINE_TEXTURE_H */