Fixed texture issue in other tutorials (except 8-2)

Author: neokabuto

OpenTKTutorial6/OpenTKTutorial6/Game.cs

@@ -89,12 +89,14 @@ protected override void OnRenderFrame(FrameEventArgs e)
             // Draw all our objects
             foreach (Volume v in objects)
             {
+                GL.ActiveTexture(TextureUnit.Texture0);
                 GL.BindTexture(TextureTarget.Texture2D, v.TextureID);
+
                 GL.UniformMatrix4(shaders[activeShader].GetUniform("modelview"), false, ref v.ModelViewProjectionMatrix);
 
-                if (shaders[activeShader].GetAttribute("maintexture") != -1)
+                if (shaders[activeShader].GetUniform("maintexture") != -1)
                 {
-                    GL.Uniform1(shaders[activeShader].GetAttribute("maintexture"), v.TextureID);
+                    GL.Uniform1(shaders[activeShader].GetUniform("maintexture"), 0);
                 }
 
                 GL.DrawElements(BeginMode.Triangles, v.IndiceCount, DrawElementsType.UnsignedInt, indiceat * sizeof(uint));

OpenTKTutorial7/OpenTKTutorial7/Game.cs

@@ -61,7 +61,7 @@ void initProgram()
             objects.Add(tc2);
 
             // OBJ models from files
-            ObjVolume obj1 = ObjVolume.LoadFromFile("cow.obj");
+            ObjVolume obj1 = ObjVolume.LoadFromFile("teapot.obj");
             obj1.TextureID = textures["opentksquare.png"];            
             objects.Add(obj1);
 
@@ -99,12 +99,13 @@ protected override void OnRenderFrame(FrameEventArgs e)
             // Draw all our objects
             foreach (Volume v in objects)
             {
+                GL.ActiveTexture(TextureUnit.Texture0);
                 GL.BindTexture(TextureTarget.Texture2D, v.TextureID);
                 GL.UniformMatrix4(shaders[activeShader].GetUniform("modelview"), false, ref v.ModelViewProjectionMatrix);
 
-                if (shaders[activeShader].GetAttribute("maintexture") != -1)
+                if (shaders[activeShader].GetUniform("maintexture") != -1)
                 {
-                    GL.Uniform1(shaders[activeShader].GetAttribute("maintexture"), v.TextureID);
+                    GL.Uniform1(shaders[activeShader].GetUniform("maintexture"), 0);
                 }
 
                 GL.DrawElements(BeginMode.Triangles, v.IndiceCount, DrawElementsType.UnsignedInt, indiceat * sizeof(uint));

OpenTKTutorial8-1/OpenTKTutorial8/Game.cs

@@ -7,7 +7,6 @@
 using OpenTK;
 using OpenTK.Graphics;
 using OpenTK.Graphics.OpenGL;
-using OpenTK.Input;
 
 namespace OpenTKTutorial8
 {
@@ -37,7 +36,6 @@ public Game()
 
         Dictionary<string, ShaderProgram> shaders = new Dictionary<string, ShaderProgram>();
         string activeShader = "default";
-
 
         float time = 0.0f;
 
@@ -97,12 +95,13 @@ protected override void OnRenderFrame(FrameEventArgs e)
             // Draw all our objects
             foreach (Volume v in objects)
             {
+                GL.ActiveTexture(TextureUnit.Texture0);
                 GL.BindTexture(TextureTarget.Texture2D, v.TextureID);
                 GL.UniformMatrix4(shaders[activeShader].GetUniform("modelview"), false, ref v.ModelViewProjectionMatrix);
 
-                if (shaders[activeShader].GetAttribute("maintexture") != -1)
+                if (shaders[activeShader].GetUniform("maintexture") != -1)
                 {
-                    GL.Uniform1(shaders[activeShader].GetAttribute("maintexture"), v.TextureID);
+                    GL.Uniform1(shaders[activeShader].GetUniform("maintexture"), 0);
                 }
 
                 GL.DrawElements(BeginMode.Triangles, v.IndiceCount, DrawElementsType.UnsignedInt, indiceat * sizeof(uint));
@@ -269,7 +268,7 @@ int loadImage(Bitmap image)
             int texID = GL.GenTexture();
 
             GL.BindTexture(TextureTarget.Texture2D, texID);
-            BitmapData data = image.LockBits(new System.Drawing.Rectangle(0, 0, image.Width, image.Height),
+            BitmapData data = image.LockBits(new Rectangle(0, 0, image.Width, image.Height),
                 ImageLockMode.ReadOnly, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
 
             GL.TexImage2D(TextureTarget.Texture2D, 0, PixelInternalFormat.Rgba, data.Width, data.Height, 0,