纹理缺乏颜色
我有以下图片：
窗口显示两个纹理，左边纹理通过将其绑定到FBO并渲染到FBO，50个随机三角形来生成。
正确的纹理是由glTexImage2D生成的蒙娜丽莎的全彩色图像，但正如你所看到的那样，图像缺少红色，我认为问题出在OpenGL部分，因为我调查了传递给它的字节glTexImage2D，它们确实包含Red ...
这是C＃/ Mono / OpenTK源
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Drawing.Drawing2D;
using System.Runtime.InteropServices;
using OpenTK;
using OpenTK.Graphics;
using OpenTK.Graphics.OpenGL;
using OpenTK.Platform;
using OpenTK.Platform.X11;
using OpenTK.Input;
using ManOCL;
namespace GlTest
{
public class MainClass: GameWindow
{
public MainClass()
: base(800, 600, new GraphicsMode(new ColorFormat(0, 0, 0, 0), 32, 0))
{
this.VSync = VSyncMode.Off;
}
public uint fbo;
public uint textureA;
public uint textureB;
public int textureAWidth = 1024;
public int textureAHeight = 1024;
public int textureBWidth;
public int textureBHeight;
Random rand = new Random();
protected override void OnLoad(EventArgs e)
{
GL.Enable(EnableCap.Blend);
GL.ShadeModel(ShadingModel.Smooth);
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
GL.Disable(EnableCap.DepthTest);
GL.Disable(EnableCap.CullFace);
// GL.PolygonMode(MaterialFace.Back, PolygonMode.Line);
// Create Color Tex
GL.GenTextures(1, out textureA);
GL.BindTexture(TextureTarget.Texture2D, textureA);
GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba8, textureAWidth, textureAHeight, 0, OpenTK.Graphics.OpenGL.PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int) TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int) TextureMagFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int) TextureWrapMode.ClampToBorder);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int) TextureWrapMode.ClampToBorder);
GL.GenTextures(1, out textureB);
GL.BindTexture(TextureTarget.Texture2D, textureB);
Bitmap bmp = new Bitmap("/Projects/MonaLisa/MonaLisa.bmp");
Console.WriteLine(textureBWidth = bmp.Width);
Console.WriteLine(textureBHeight = bmp.Height);
//get the data out of the bitmap
System.Drawing.Imaging.BitmapData bmpBits = bmp.LockBits
(
new System.Drawing.Rectangle(0,0,textureBWidth, textureBHeight),
System.Drawing.Imaging.ImageLockMode.ReadOnly,
System.Drawing.Imaging.PixelFormat.Format32bppRgb
);
for (int row = 0; row < 1; row++)
{
for (int col = 0; col < 32; col++)
{
Console.WriteLine
(
"{0}, {1}, {2}, {3}",
Marshal.ReadByte(bmpBits.Scan0, (row * textureBWidth + col) * 4 + 0),
Marshal.ReadByte(bmpBits.Scan0, (row * textureBWidth + col) * 4 + 1),
Marshal.ReadByte(bmpBits.Scan0, (row * textureBWidth + col) * 4 + 2),
Marshal.ReadByte(bmpBits.Scan0, (row * textureBWidth + col) * 4 + 3)
);
}
}
Console.WriteLine(bmpBits.Width);
Console.WriteLine(bmpBits.Height);
GL.TexImage2D
(
TextureTarget.Texture2D,
0,
PixelInternalFormat.Rgba,
textureBWidth,
textureBHeight,
0,
OpenTK.Graphics.OpenGL.PixelFormat.Rgba,
PixelType.UnsignedByte,
bmpBits.Scan0
);
// GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba8, textureBWidth, textureBHeight, 0, OpenTK.Graphics.OpenGL.PixelFormat.Rgba, PixelType.UnsignedByte, IntPtr.Zero);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int) TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int) TextureMagFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int) TextureWrapMode.ClampToBorder);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int) TextureWrapMode.ClampToBorder);
//free the bitmap data (we dont need it anymore because it has been passed to the OpenGL driver
bmp.UnlockBits(bmpBits);
// Create a FBO and attach the textures
GL.Ext.GenFramebuffers(1, out fbo);
GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, fbo);
GL.Ext.FramebufferTexture2D(FramebufferTarget.FramebufferExt, FramebufferAttachment.ColorAttachment0Ext, TextureTarget.Texture2D, textureA, 0);
#region Test for Error
switch (GL.Ext.CheckFramebufferStatus(FramebufferTarget.FramebufferExt))
{
case FramebufferErrorCode.FramebufferCompleteExt:
{
Console.WriteLine("FBO: The framebuffer is complete and valid for rendering.");
break;
}
case FramebufferErrorCode.FramebufferIncompleteAttachmentExt:
{
Console.WriteLine("FBO: One or more attachment points are not framebuffer attachment complete. This could mean there’s no texture attached or the format isn’t renderable. For color textures this means the base format must be RGB or RGBA and for depth textures it must be a DEPTH_COMPONENT format. Other causes of this error are that the width or height is zero or the z-offset is out of range in case of render to volume.");
break;
}
case FramebufferErrorCode.FramebufferIncompleteMissingAttachmentExt:
{
Console.WriteLine("FBO: There are no attachments.");
break;
}
/* case FramebufferErrorCode.GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT:
{
Console.WriteLine("FBO: An object has been attached to more than one attachment point.");
break;
}*/
case FramebufferErrorCode.FramebufferIncompleteDimensionsExt:
{
Console.WriteLine("FBO: Attachments are of different size. All attachments must have the same width and height.");
break;
}
case FramebufferErrorCode.FramebufferIncompleteFormatsExt:
{
Console.WriteLine("FBO: The color attachments have different format. All color attachments must have the same format.");
break;
}
case FramebufferErrorCode.FramebufferIncompleteDrawBufferExt:
{
Console.WriteLine("FBO: An attachment point referenced by GL.DrawBuffers() doesn’t have an attachment.");
break;
}
case FramebufferErrorCode.FramebufferIncompleteReadBufferExt:
{
Console.WriteLine("FBO: The attachment point referenced by GL.ReadBuffers() doesn’t have an attachment.");
break;
}
case FramebufferErrorCode.FramebufferUnsupportedExt:
{
Console.WriteLine("FBO: This particular FBO configuration is not supported by the implementation.");
break;
}
default:
{
Console.WriteLine("FBO: Status unknown. (yes, this is really bad.)");
break;
}
}
// using FBO might have changed states, e.g. the FBO might not support stereoscopic views or double buffering
int[] queryinfo = new int[6];
GL.GetInteger(GetPName.MaxColorAttachmentsExt, out queryinfo[0]);
GL.GetInteger(GetPName.AuxBuffers, out queryinfo[1]);
GL.GetInteger(GetPName.MaxDrawBuffers, out queryinfo[2]);
GL.GetInteger(GetPName.Stereo, out queryinfo[3]);
GL.GetInteger(GetPName.Samples, out queryinfo[4]);
GL.GetInteger(GetPName.Doublebuffer, out queryinfo[5]);
Console.WriteLine("max. ColorBuffers: " + queryinfo[0] + " max. AuxBuffers: " + queryinfo[1] + " max. DrawBuffers: " + queryinfo[2] +
"\nStereo: " + queryinfo[3] + " Samples: " + queryinfo[4] + " DoubleBuffer: " + queryinfo[5]);
Console.WriteLine("Last GL Error: " + GL.GetError());
#endregion Test for Error
GL.PushAttrib(AttribMask.ViewportBit);
{
GL.Viewport(0, 0, textureAWidth, textureAHeight);
OpenTK.Matrix4 orthogonal = OpenTK.Matrix4.CreateOrthographicOffCenter(0, 1, 0, 1, -3, 3);
GL.MatrixMode(MatrixMode.Projection);
GL.LoadMatrix(ref orthogonal);
Matrix4 lookat = Matrix4.LookAt(0, 0, 1, 0, 0, 0, 0, 1, 0);
GL.MatrixMode(MatrixMode.Modelview);
GL.LoadMatrix(ref lookat);
// clear the screen in red, to make it very obvious what the clear affected. only the FBO, not the real framebuffer
GL.ClearColor(0f, 0f, 0f, 0f);
GL.Clear(ClearBufferMask.ColorBufferBit);
// smack 50 random triangles into the FBO's textures
GL.Begin(BeginMode.Triangles);
{
for (int i = 0; i < 50; i++)
{
GL.Color4(((float)(rand.NextDouble())), ((float)(rand.NextDouble())), ((float)(rand.NextDouble())), ((float)(rand.NextDouble())));
GL.Vertex3(((float)(rand.NextDouble())), ((float)(rand.NextDouble())), 0);
GL.Color4(((float)(rand.NextDouble())), ((float)(rand.NextDouble())), ((float)(rand.NextDouble())), ((float)(rand.NextDouble())));
GL.Vertex3(((float)(rand.NextDouble())), ((float)(rand.NextDouble())), 0);
GL.Color4(((float)(rand.NextDouble())), ((float)(rand.NextDouble())), ((float)(rand.NextDouble())), ((float)(rand.NextDouble())));
GL.Vertex3(((float)(rand.NextDouble())), ((float)(rand.NextDouble())), 0);
}
}
GL.End();
}
GL.PopAttrib();
GL.Ext.BindFramebuffer(FramebufferTarget.FramebufferExt, 0); // disable rendering into the FBO
GL.ClearColor(1f, 1f, 1f, 0.0f);
GL.Color3(1f, 1f, 1f);
GL.Enable(EnableCap.Texture2D); // enable Texture Mapping
GL.BindTexture(TextureTarget.Texture2D, 0); // bind default texture
// IntPtr cglContext = Monobjc.OpenGL.CGL.GetCurrentContext();
//
// IntPtr cglShareGroup = Monobjc.OpenGL.CGL.GetShareGroup(cglContext);
//
// ManOCL.Context.ShareWithCGL(cglShareGroup);
//
// Kernel kernel = ManOCL.Kernel.Create
// (
// "kernel1",
// @"__kernel void kernel1(__global int *srcimg, __global int * output, __global int *smp)
// {
// }",
// new Argument[]
// {
// DeviceGlobalMemory.CreateFromArray(new int[1]),
// DeviceGlobalMemory.CreateFromArray(new int[2]),
// DeviceGlobalMemory.CreateFromArray(new int[1])
// }
// );
// Console.WriteLine("Success!");
// Console.WriteLine(kernel);
}
protected override void OnUnload(EventArgs e)
{
// Clean up what we allocated before exiting
GL.DeleteTextures(1, ref textureA);
GL.DeleteTextures(1, ref textureB);
GL.Ext.DeleteFramebuffers(1, ref fbo);
base.OnUnload(e);
}
protected override void OnResize (EventArgs e)
{
GL.Viewport(0, 0, Width, Height);
double aspect_ratio = Width / (double)Height;
OpenTK.Matrix4 perspective = OpenTK.Matrix4.CreatePerspectiveFieldOfView(MathHelper.PiOver4 * 3 / 2, (float)aspect_ratio, 1, 64);
GL.MatrixMode(MatrixMode.Projection);
GL.LoadMatrix(ref perspective);
Matrix4 lookat = Matrix4.LookAt(0, 0, 3, 0, 0, 0, 0, 1, 0);
GL.MatrixMode(MatrixMode.Modelview);
GL.LoadMatrix(ref lookat);
base.OnResize(e);
}
protected override void OnUpdateFrame (FrameEventArgs e)
{
base.OnUpdateFrame(e);
if (Keyboard[Key.Escape])
{
this.Exit();
}
}
protected override void OnRenderFrame(FrameEventArgs e)
{
this.Title = "Frames per Second: " + (1.0 / e.Time);
GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
GL.PushMatrix();
{
// Draw the Color Texture
GL.Translate(-1f, 0f, 0f);
GL.BindTexture(TextureTarget.Texture2D, textureA);
GL.Begin(BeginMode.Quads);
{
GL.TexCoord2(0f, 1f);
GL.Vertex2(-1.0f, 1.0f);
GL.TexCoord2(0.0f, 0.0f);
GL.Vertex2(-1.0f, -1.0f);
GL.TexCoord2(1.0f, 0.0f);
GL.Vertex2(1.0f, -1.0f);
GL.TexCoord2(1.0f, 1.0f);
GL.Vertex2(1.0f, 1.0f);
}
GL.End();
GL.Translate(2f, 0f, 0f);
GL.BindTexture(TextureTarget.Texture2D, textureB);
GL.Begin(BeginMode.Quads);
{
GL.TexCoord2(0f, 0f);
GL.Vertex2(-1.0f, 1.0f);
GL.TexCoord2(0.0f, 1.0f);
GL.Vertex2(-1.0f, -1.0f);
GL.TexCoord2(1.0f, 1.0f);
GL.Vertex2(1.0f, -1.0f);
GL.TexCoord2(1.0f, 0.0f);
GL.Vertex2(1.0f, 1.0f);
}
GL.End();
GL.Translate(0f, 0f, 0f);
}
GL.PopMatrix();
this.SwapBuffers();
}
#region public static void Main()
/// <summary>
/// Entry point of this example.
/// </summary>
[STAThread]
public static void Main()
{
using (MainClass example = new MainClass())
{
example.Title = "FrameBufferObjects";
example.Run(1.0, 0.0);
}
}
#endregion
}
}
1 个答案:
答案 0 :(得分：7)
在您设置纹理数据的代码中：
GL.TexImage2D
(
TextureTarget.Texture2D,
0,
PixelInternalFormat.Rgba,
textureBWidth,
textureBHeight,
0,
OpenTK.Graphics.OpenGL.PixelFormat.Rgba,
PixelType.UnsignedByte,
bmpBits.Scan0
);
将像素格式更改为
OpenTK.Graphics.OpenGL.PixelFormat.Bgra;
Windows位图和opengl在像素上具有不同的字节顺序，即字节相反。
相关问题
最新问题
- 我写了这段代码，但我无法理解我的错误
- 我无法从一个代码实例的列表中删除 None 值，但我可以在另一个实例中。为什么它适用于一个细分市场而不适用于另一个细分市场？
- 是否有可能使 loadstring 不可能等于打印？卢阿
- java中的random.expovariate()
- Appscript 通过会议在 Google 日历中发送电子邮件和创建活动
- 为什么我的 Onclick 箭头功能在 React 中不起作用？
- 在此代码中是否有使用“this”的替代方法？
- 在 SQL Server 和 PostgreSQL 上查询，我如何从第一个表获得第二个表的可视化
- 每千个数字得到
- 更新了城市边界 KML 文件的来源？