From 9dcbb5222c77cd853490552bb636a9b89e59f51d Mon Sep 17 00:00:00 2001
From: josh <josh@bd8a9e45-a331-0410-811e-c64571078777>
Date: Tue, 29 Jan 2008 04:52:55 +0000
Subject: [PATCH] initial import

git-svn-id: svn://anubis/misc/TextureCache@27 bd8a9e45-a331-0410-811e-c64571078777
---
 Makefile        | 12 +++++++
 TextureCache.cc | 94 +++++++++++++++++++++++++++++++++++++++++++++++++
 TextureCache.hh | 20 +++++++++++
 3 files changed, 126 insertions(+)
 create mode 100644 Makefile
 create mode 100644 TextureCache.cc
 create mode 100644 TextureCache.hh

diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..19fec6d
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,12 @@
+
+CXX      := g++
+CXXFLAGS := -O2
+OBJS     := TextureCache.o
+
+all: $(OBJS)
+
+%.o: %.cc %.hh
+	$(CXX) -c -o $@ $< $(CXXFLAGS)
+
+clean:
+	-rm -f *~ *.o
diff --git a/TextureCache.cc b/TextureCache.cc
new file mode 100644
index 0000000..8a8ab29
--- /dev/null
+++ b/TextureCache.cc
@@ -0,0 +1,94 @@
+
+#include <SDL/SDL.h>
+#include <SDL/SDL_image.h>
+#include <GL/gl.h>
+#include <GL/glu.h>
+#include <iostream>
+#include "TextureCache.hh"
+using namespace std;
+
+GLuint TextureCache::load(const string & filename)
+{
+	map<string,GLuint>::iterator it = m_cache.find(filename);
+	if (it != m_cache.end())
+		return it->second;
+	GLuint tex = loadTexture(filename.c_str());
+	m_cache[filename] = tex;
+	return tex;
+}
+
+GLuint TextureCache::loadTexture(const char * filename,
+                                 bool mipmaps,
+                                 int mode,
+                                 int quality)
+{
+	GLuint texture;
+	SDL_Surface * temp = IMG_Load(filename);
+	if (!temp)
+	{
+		cerr << "Failed to load image '" << filename << "'!" << endl;
+		return 0;
+	}
+
+	SDL_PixelFormat fmt;
+	fmt.palette = NULL;
+	fmt.BitsPerPixel = 32;
+	fmt.BytesPerPixel = 4;
+	fmt.Rmask = 0x000000FF;
+	fmt.Gmask = 0x0000FF00;
+	fmt.Bmask = 0x00FF0000;
+	fmt.Amask = 0xFF000000;
+	fmt.Rshift = 0;
+	fmt.Gshift = 8;
+	fmt.Bshift = 16;
+	fmt.Ashift = 24;
+
+	SDL_Surface * texsurf = SDL_ConvertSurface(temp, &fmt, SDL_SWSURFACE);
+	SDL_FreeSurface(temp);
+	if (!texsurf)
+	{
+		cerr << '\'' << filename << "' was not converted properly!" << endl;
+		return 0;
+	}
+	unsigned int * pixels = new unsigned int[texsurf->w * texsurf->h];
+	int y;
+	unsigned int dstOffset = texsurf->w * (texsurf->h - 1);
+	unsigned int srcOffset = 0;
+	for (y = 0; y < texsurf->h; y++)
+	{
+		memcpy(pixels + dstOffset,
+			((unsigned int *)texsurf->pixels) + srcOffset,
+			texsurf->w << 2);
+		dstOffset -= texsurf->w;
+		srcOffset += texsurf->w;
+	}
+	glGenTextures(1, &texture);
+	glBindTexture(GL_TEXTURE_2D, texture);
+	glTexImage2D(GL_TEXTURE_2D, 0, 4, texsurf->w, texsurf->h, 0,
+		GL_RGBA, GL_UNSIGNED_BYTE, pixels);
+
+	if (quality > 0)
+	{
+		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
+			mipmaps ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR);
+		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
+			mipmaps ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR);
+	}
+	else
+	{
+		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
+			mipmaps ? GL_NEAREST_MIPMAP_NEAREST : GL_NEAREST);
+		glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
+			mipmaps ? GL_NEAREST_MIPMAP_NEAREST : GL_NEAREST);
+	}
+
+	glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, mode);
+
+	if (mipmaps)
+		gluBuild2DMipmaps(GL_TEXTURE_2D, GL_RGBA,
+			texsurf->w, texsurf->h, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
+
+	SDL_FreeSurface(texsurf);
+	delete[] pixels;
+	return texture;
+}
diff --git a/TextureCache.hh b/TextureCache.hh
new file mode 100644
index 0000000..25a9d06
--- /dev/null
+++ b/TextureCache.hh
@@ -0,0 +1,20 @@
+
+#include <GL/gl.h>
+#include <map>
+#include <string>
+
+class TextureCache
+{
+public:
+	GLuint load(const std::string & filename);
+
+private:
+	/* methods */
+	GLuint loadTexture(const char * filename,
+	                   bool mipmaps = false,
+	                   int mode = GL_DECAL,
+	                   int quality = 1);
+
+	/* data */
+	std::map< std::string, GLuint > m_cache;
+};