Fix small errors in driver.

Quik/OpenGL/GL.cs

@@ -16,7 +16,7 @@ namespace Quik.OpenGL
         private delegate void GLI4Proc(int x, int y, int z, int w);
         private delegate void GLF4Proc(float x, float y, float z, float w);
         private delegate void DrawElementsProc(GLEnum primitive, int size, GLEnum type, void *offset);
-        private delegate void DrawArraysProc(GLEnum primitive, int size, void *offset);
+        private delegate void DrawArraysProc(GLEnum primitive, int first, int offset);
         private delegate void GetIntegervProc(GLEnum pname, int *data);
         private delegate void GetFloatvProc(GLEnum pname, float *data);
         private delegate byte* GetStringProc(GLEnum pname);
@@ -88,7 +88,7 @@ namespace Quik.OpenGL
         public static void DrawElements(GLEnum primitive, int count, GLEnum type, int offset) => _drawElements(primitive, count, type, (void*)offset);
 
         [MethodImpl(AggressiveInlining)]
-        public static void DrawArrays(GLEnum primitive, int count, int offset) => _drawArrays(primitive, count, (void*)offset);
+        public static void DrawArrays(GLEnum primitive, int offset, int count) => _drawArrays(primitive, offset, count);
 
         [MethodImpl(AggressiveInlining)]
         public static void Get(GLEnum pname, out int value)

Quik/OpenGL/GL21Driver.cs

@@ -93,7 +93,7 @@ namespace Quik.OpenGL
             QMat4.Orthographic(out QMat4 matrix, view);
 
             GL.UseProgram(program);
-            GL.Uniform1(iMaxZ, queue.ZDepth);
+            GL.Uniform1(iMaxZ, queue.ZDepth+1);
             GL.UniformMatrix4(m4Transforms, false, in matrix);
             GL.Uniform1(fSdfThreshold, 0.0f);
             GL.Uniform1(txTexture, 0);
@@ -116,7 +116,7 @@ namespace Quik.OpenGL
                     GL.Uniform1(iEnableTexture, 0);
                 }
 
-                GL.DrawArrays(GL_TRIANGLES, call.Count, call.Start);
+                GL.DrawElements(GL_TRIANGLES, call.Count, GL_UNSIGNED_INT, sizeof(int)*call.Start);
             }
         }
 
@@ -138,6 +138,7 @@ namespace Quik.OpenGL
 
             int shader = GL.CreateShader(type);
             GL.ShaderSource(shader, text);
+            GL.CompileShader(shader);
 
             if (CheckShader(shader, out string msg) == false)
             {
@@ -157,7 +158,7 @@ namespace Quik.OpenGL
 
             GL.GetShader(shader, GL_COMPILE_STATUS, out int i);
 
-            if (i != (int)GL_OK)
+            if (i != (int)GL_TRUE)
             {
                 message = GL.GetShaderInfoLog(shader);
                 return false;
@@ -229,15 +230,13 @@ namespace Quik.OpenGL
 
             public DrawData(GL21Driver driver, DrawQueue queue)
             {
-                int a = 0, b = 0, c = 0, d = 0;
                 Queue = queue;
                 this.driver = driver;
                 VertexArray = GL.GenVertexArray();
-                GL.GenBuffers(4, out a);
+                GL.GenBuffers(1, out vbo1);
-                vbo1  = a;
+                GL.GenBuffers(1, out vbo2);
-                vbo2  = b;
+                GL.GenBuffers(1, out ebo1);
-                ebo1 = c;
+                GL.GenBuffers(1, out ebo2);
-                ebo2 = d;
                 isDisposed = false;
             }
 
@@ -257,7 +256,11 @@ namespace Quik.OpenGL
                 GL.VertexAttribPointer(driver.v2Position, 2, GL_FLOAT, false, QuikVertex.Stride, QuikVertex.PositionOffset);
                 GL.VertexAttribIPointer(driver.iZIndex, 1, GL_UNSIGNED_INT, QuikVertex.Stride, QuikVertex.ZIndexOffset);
                 GL.VertexAttribPointer(driver.v2TexPos, 2, GL_FLOAT, false, QuikVertex.Stride, QuikVertex.TextureCoordinatesOffset);
-                GL.VertexAttribPointer(driver.v4Color, 4, GL_FLOAT, false, QuikVertex.Stride, QuikVertex.ColorOffset);
+                GL.VertexAttribPointer(driver.v4Color, 4, GL_UNSIGNED_BYTE, true, QuikVertex.Stride, QuikVertex.ColorOffset);
+                GL.EnableVertexAttribArray(driver.v2Position);
+                GL.EnableVertexAttribArray(driver.iZIndex);
+                GL.EnableVertexAttribArray(driver.v2TexPos);
+                GL.EnableVertexAttribArray(driver.v4Color);
 
                 GL.BindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
                 GL.BufferData(GL_ELEMENT_ARRAY_BUFFER, Queue.ElementCount * sizeof(int), Queue.ElementArray, GL_STREAM_DRAW);

Quik/OpenGL/GLEnum.cs

@@ -3,6 +3,8 @@ namespace Quik.OpenGL
     public enum GLEnum : int
     {
         GL_OK = 0,
+        GL_TRUE = 1,
+        GL_FALSE = 0,
         GL_MAJOR_VERSION = 0x821B,
         GL_MINOR_VERSION = 0x821C,
         GL_VENDOR = 0x1F00,

Quik/res/gl21.frag

@@ -2,7 +2,7 @@
  * QUIK: User Interface Kit
  * Copyright (C) 2023 Halit Utku Maden, et al.
  */
-#version 110
+#version 120
 
 varying vec2        fv2TexPos;
 varying vec4        fv4Color;

Quik/res/gl21.vert

@@ -2,7 +2,7 @@
  * QUIK: User Interface Kit
  * Copyright (C) 2023 Halit Utku Maden, et al.
  */
-#version 110
+#version 120
 
 attribute vec2  v2Position;     /**< The vertex position.*/
 attribute int   iZIndex;        /**< The z index. */
@@ -21,5 +21,5 @@ void main(void)
     gl_Position = v * m4Transforms;
 
     fv2TexPos = v2TexPos;
-    fv4Color = fv4Color;
+    fv4Color = v4Color;
 }

tests/QuikDemo/Program.cs

@@ -1,6 +1,9 @@
 using Quik;
+using Quik.CommandMachine;
+using Quik.Controls;
 using Quik.OpenTK;
 
+
 namespace QuikDemo
 {
     public static class Program
@@ -9,7 +12,17 @@ namespace QuikDemo
 
         public static void Main(string[] args)
         {
-            Application.Run(new Quik.Controls.View());
+            Application.Run(new EmptyView());
+        }
+    }
+
+    public class EmptyView : View
+    {
+        protected override void PaintBegin(CommandQueue cmd)
+        {
+            base.PaintBegin(cmd);
+
+            cmd.Rectangle(new QRectangle(0, 0, 16, 16));
         }
     }
 }