What is the process for binding texture to a buffer?

[enablerbr]

i'm trying to work out render-to-texture. yet i can't work out how to bind a texture to a buffer. also can i bind a camera to a buffer?

 

 

 

Edit: ok i worked out how to bind buffer to texture. yet the result has the buffer image as being upside down. how do i fix this? do i have to flip the image within a shader. as i see no texture commands for flipping. this is my current code (now includes render-to-texture placed in material).

 

           int width = 800;int height = 600;

           Graphic.Graphics(width, height, 0, 0, GraphicModes.GraphicsBackBuffer | GraphicModes.GraphicsDepthBuffer);
           Worlds wld = new Worlds();
           wld.CreateWorld();

           Cameras cam1 = new Cameras();
           cam1.CreateCamera(IntPtr.Zero);
           cam1.CameraZoom(Helper.FPSCameraFOV(60));
           cam1.MoveEntity(new Vector3(0f, 2.5f, -6f), 0);
           cam1.EntityHide();

           SpotLight spot1 = new SpotLight();
           spot1.CreateSpotLight(12.5f, IntPtr.Zero);
           spot1.LightConeAngles(3f, 13f);
           spot1.EntityColor(new Color4(0f, 0f, 2f,0f), Mode.Disabled);
           spot1.PositionEntity(new Vector3(0f, 10f, -2.5f), 0);
           spot1.RotateEntity(new Vector3(90f, 0f, 0f), 0);
           spot1.SetShadowSoftness(0.5f);
           spot1.SetShadowMapSize(1024);

           Cameras cam2 = new Cameras();
           cam2.CreateCamera(IntPtr.Zero);
           cam2.CameraZoom(Helper.FPSCameraFOV(60));
           cam2.MoveEntity(new Vector3(0f, 2.5f, 6f), 0);
           cam2.RotateEntity(new Vector3(180f, 0f, 180f), 0);
           cam2.EntityHide();

           SpotLight spot2 = new SpotLight();
           spot2.CreateSpotLight(12.5f, IntPtr.Zero);
           spot2.LightConeAngles(3f, 13f);
           spot2.EntityColor(new Color4(2f,0f,0f,0f),Mode.Disabled);
           spot2.PositionEntity(new Vector3(0f, 10f, 2.5f), 0);
           spot2.RotateEntity(new Vector3(90f, 0f, 0f), 0);
           spot2.SetShadowSoftness(0.5f);
           spot2.SetShadowMapSize(1024);

           Cube cube1 = new Cube();
           cube1.CreateCube(IntPtr.Zero);
           cube1.UpdateMesh();
           cube1.PositionEntity(new Vector3(0f, 2.5f, 2.5f), 0);
           cube1.EntityOcclusionMode(OcclusionMode.Hardware, Mode.Disabled);

           Cube ground = new Cube();
           ground.CreateCube(IntPtr.Zero);
           ground.ScaleEntity(new Vector3(10f, 1f, 5f));
           ground.UpdateMesh();
           ground.PositionEntity(new Vector3(0f, 0f, 2.5f), 0);
           ground.EntityOcclusionMode(OcclusionMode.Hardware, Mode.Disabled);

           Cube ground2 = new Cube();
           ground2.CreateCube(IntPtr.Zero);
           ground2.ScaleEntity(new Vector3(10f, 1f, 5f));
           ground2.UpdateMesh();
           ground2.PositionEntity(new Vector3(0f, 0f, -2.5f), 0);
           ground2.EntityOcclusionMode(OcclusionMode.Hardware, Mode.Disabled);

           Cube pictureframe = new Cube();
           pictureframe.CreateCube(IntPtr.Zero);
           pictureframe.ScaleEntity(new Vector3(1.5f, 1.5f, 0.01f));
           pictureframe.UpdateMesh();
           pictureframe.PositionEntity(new Vector3(0f, 2.5f, -2.5f), 0);
           pictureframe.EntityOcclusionMode(OcclusionMode.Hardware, Mode.Disabled);

           Cube wall = new Cube();
           wall.CreateCube(IntPtr.Zero);
           wall.ScaleEntity(new Vector3(5f, 5f, 1f));
           wall.UpdateMesh();
           wall.PositionEntity(new Vector3(0f, 2.5f, 0f), 0);
           wall.EntityOcclusionMode(OcclusionMode.Hardware, Mode.Disabled);
           Lights.SetShadowQuality(ShadowQuality.High);

           Buffers gbuffer = new Buffers();
           gbuffer.CreateBuffer(Graphic.GetGraphicsWidth(), Graphic.GetGraphicsHeight(), BufferModes.BufferColor | BufferModes.BufferDepth | BufferModes.BufferNormal);

           Buffers rttbuffer = new Buffers();
           rttbuffer.CreateBuffer(Graphic.GetGraphicsWidth(), Graphic.GetGraphicsHeight(), BufferModes.BufferColor | BufferModes.BufferDepth | BufferModes.BufferNormal);

           Textures rttexture = new Textures();
           rttexture.CreateTexture(128, 128, TextureFormats.TextureFloat);
           rttexture.Texture = rttbuffer.GetColorBuffer(0);

           Materials wallmat = new Materials();
           wallmat.LoadMaterial("Materials/RTTMat/RTTMat.mat");
           wallmat.SetMaterialTexture(rttexture.Texture, 0);

           Surfaces.PaintSurface(Surfaces.GetSurface(pictureframe.Mesh,1),wallmat.Material);

           while (!Convert.ToBoolean(Input.KeyHit(KeyboardKey.KeyEscape)) & !Convert.ToBoolean(Miscellaneous.AppTerminate()))
           {
               cube1.TurnEntity(new Vector3(0.5f, 0.5f, 0.5f), 0);
               pictureframe.TurnEntity(new Vector3(0.2f, 0f, 0f), 0);
               Timing.UpdateAppTime();
               Worlds.UpdateWorld(0f);

               // Grabs render-to-texture from camera cam2

               cam2.EntityShow();

               Buffers.SetBuffer(gbuffer.Buffer);

               Worlds.RenderWorld(Elements.EntityAll);

               Buffers.SetBuffer(Buffers.BackBuffer());

               Lights.RenderLights(gbuffer.Buffer);

               rttbuffer.CopySourceToBuffer(Buffers.BackBuffer(), Components.BufferColor | Components.BufferDepth | Components.BufferNormal);

               // Hides camera cam 2 and shows camera cam1

               cam2.EntityHide();
               cam1.EntityShow();

               Buffers.SetBuffer(gbuffer.Buffer);

               Worlds.RenderWorld(Elements.EntityAll);

               Buffers.SetBuffer(Buffers.BackBuffer());

               Lights.RenderLights(gbuffer.Buffer);

               // Draws render-to-texture to screen

               Draw.DrawImage(rttexture.Texture, 40, 40, 40 + 128, 40 + 128);

               Draw.DrawText(Convert.ToString(Timing.UPS()), Graphic.GetGraphicsWidth()-60, 40);

               Graphic.Flip(SyncMode.Disable);
           }

 

ok i just realised my mistake. cam2 shouldn't of had the z axis rotated. oops sorry.

[Josh]

When a buffer is rendered to, the image is upside down.

 

Yeah, I know it is annoying, but I am using the same code that renders to the back buffer. Maybe I could auto-flip the viewport when rendering to a buffer, but then it would break existing code.

[ArBuZ]

Ive solved flipped images problem by getting and drawing buffer data two times( sorry for my english )

 

1. get texture from current buffer

2. draw it to another buffer

3 get the texture from the last buffer

[AggrorJorn]

This might sound silly, but can't you rotate the camera up side down. So when the camera renders to a texture, it's returning the object normal.

[paramecij]

change:

Draw.DrawImage(rttexture.Texture, 40, 40, 40 + 128, 40 + 128);

to:

Draw.DrawImage(rttexture.Texture, 40, 40+ 40 + 128, 40 + 128, -(40 + 128)); // may not be correct with the +40's

 

 

basically you can flip the image when drawing it by starting y at the bottom and supplying negative height

DrawImage( GetColorBuffer(fullscreenbuffer), 0, GraphicsHeight(), GraphicsWidth(), -GraphicsHeight() ); // like that

 

It's an obscure feature but quite common in 3d as i see...