texture manager

1 files changed, 136 insertions, 0 deletions

diff --git a/src/render/textures.cc b/src/render/textures.cc
new file mode 100644
index 0000000..6880d87
--- /dev/null
+++ b/src/render/textures.cc
@@ -0,0 +1,136 @@
+/*
+   render/textures.cc
+   This file is part of the Osirion project and is distributed under 
+   the terms of the GNU General Public License version 2 
+*/
+
+
+
+#include "render/gl.h"
+#include "render/textures.h"
+#include "render/tga.h"
+
+#include "sys/sys.h"
+#include "core/application.h"
+
+namespace render {
+
+std::map<std::string, size_t> Textures::registry;
+size_t Textures::index = 0;
+GLuint Textures::textures[MAXTEXTURES];
+
+void Textures::init()
+{
+	clear();
+	con_print << "Loading textures..." << std::endl;
+
+	// "no texture" bitmap
+	load("textures/common/notex");
+
+	// console characters
+	if (load("bitmaps/conchars") == 0) {
+		con_error << "Essential file bitmaps/conchars missing" << std::endl;
+		core::application()->shutdown();
+	}
+
+	// loading screen background
+	load("bitmaps/loader");
+
+	// crosshairs
+	load("bitmaps/crosshair");
+	
+	// light flares
+	load("bitmaps/fx/flare00");
+	load("bitmaps/fx/flare01");
+}
+
+void Textures::shutdown()
+{
+	clear();
+}
+
+void Textures::clear()
+{
+	if (index)
+		glDeleteTextures(index, textures);
+
+	registry.clear();
+	memset(textures,0, sizeof(textures));
+	index = 0;
+}
+
+size_t Textures::load(std::string name)
+{
+	// check if it is already loaded
+	iterator it = registry.find(name);
+	if (it != registry.end())
+		return (*it).second;
+
+	// try the tga version 
+	std::string filename(name);
+	filename.append(".tga");
+	Image *image = TGA::load(filename.c_str());
+	if (!image) {
+		// add to the registry with id 0 (texture not found)
+		registry[name] = 0;
+		return 0;
+	}
+
+	if (index == MAXTEXTURES) {
+		con_error << "Texture limit " << MAXTEXTURES << " exceeded!" << std::endl;
+		delete image;
+		registry[name] = 0;
+		return 0;
+	}
+
+	size_t id = index;
+
+	glGenTextures(1, &textures[id]);
+	glBindTexture(GL_TEXTURE_2D, textures[id]);
+
+	int texture_type;
+	if (image->channels() == 4)
+		texture_type = GL_RGBA;
+	else
+		texture_type = GL_RGB;
+
+	gluBuild2DMipmaps(GL_TEXTURE_2D, image->channels(),
+		image->width(), image->height(), texture_type, GL_UNSIGNED_BYTE, image->data());
+
+	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_NEAREST);
+	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR_MIPMAP_LINEAR);	
+
+	// add to the registry
+	registry[name] = id;
+	index++;
+
+	// delete image data
+	delete image;
+
+	return id;
+}
+
+size_t Textures::bind(std::string name)
+{
+	size_t id = 0;
+	iterator it = registry.find(name);
+	if (it != registry.end())
+		id = (*it).second;
+	else
+		id = load(name);
+
+	glBindTexture(GL_TEXTURE_2D, textures[id]);
+	return id;
+}
+
+size_t Textures::bind(size_t texture)
+{
+	size_t id = texture;
+	if (texture >= index)
+		id = 0;
+
+	glBindTexture(GL_TEXTURE_2D, textures[id]);
+	return id;
+}
+
+}