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using System;
using System.Collections.Generic;
using System.Linq;
using System.Drawing;
using MonoMac.Foundation;
using MonoMac.AppKit;
using MonoMac.CoreGraphics;
using MonoMac.OpenGL;
namespace GLFullScreen
{
public class Texture : NSObject
{
int texId;
int pboId;
byte[] data;
const int TEXTURE_WIDTH = 1024;
const int TEXTURE_HEIGHT = 512;
private Texture () : base()
{
}
public Texture (string path) : base()
{
GetImagaDataFromPath (path);
LoadTexture ();
}
void GetImagaDataFromPath (string path)
{
int width, height;
NSImage src;
CGImage image;
CGContext context = null;
data = new byte[TEXTURE_WIDTH * TEXTURE_HEIGHT * 4];
src = new NSImage (path);
image = src.AsCGImage (RectangleF.Empty, null, null);
width = image.Width;
height = image.Height;
CGImageAlphaInfo ai = CGImageAlphaInfo.PremultipliedLast;
context = new CGBitmapContext (data, width, height, 8, 4 * width, image.ColorSpace, ai);
// Core Graphics referential is upside-down compared to OpenGL referential
// Flip the Core Graphics context here
// An alternative is to use flipped OpenGL texture coordinates when drawing textures
context.TranslateCTM (0, height);
context.ScaleCTM (1, -1);
// Set the blend mode to copy before drawing since the previous contents of memory aren't used.
// This avoids unnecessary blending.
context.SetBlendMode (CGBlendMode.Copy);
context.DrawImage (new RectangleF (0, 0, width, height), image);
}
void LoadTexture ()
{
GL.GenTextures (1, out texId);
GL.GenBuffers (1, out pboId);
// Bind the texture
GL.BindTexture (TextureTarget.Texture2D, texId);
// Bind the PBO
GL.BindBuffer (BufferTarget.PixelUnpackBuffer, pboId);
// Upload the texture data to the PBO
GL.BufferData (BufferTarget.PixelUnpackBuffer, new IntPtr (TEXTURE_WIDTH * TEXTURE_HEIGHT * 4 * sizeof(byte)), data, BufferUsageHint.StaticDraw);
// Setup texture parameters
GL.TexParameter (TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)All.Nearest);
GL.TexParameter (TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)All.Nearest);
GL.TexParameter (TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)All.ClampToEdge);
GL.TexParameter (TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)All.ClampToEdge);
GL.PixelStore (PixelStoreParameter.UnpackRowLength, 0);
// OpenGL likes the GL_BGRA + GL_UNSIGNED_INT_8_8_8_8_REV combination
// Use offset instead of pointer to indictate that we want to use data copied from a PBO
GL.TexImage2D (TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, TEXTURE_WIDTH, TEXTURE_HEIGHT, 0, PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
data = null;
GL.BindTexture (TextureTarget.Texture2D, 0);
GL.BindBuffer (BufferTarget.PixelUnpackBuffer, 0);
}
public int TextureName {
get { return texId; }
}
}
}
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