mesh and vertex buffers, continue development

src/dlangui/graphics/glsupport.d

@@ -1003,44 +1003,75 @@ alias FBO = GLObject!(GLObjectTypes.Framebuffer, GL_FRAMEBUFFER);
 
 import dlangui.graphics.scene.mesh;
 
-class VertexBuffer {
-    protected GLuint _vertexBuffer;
-    protected bool _dynamic;
-    this(Mesh mesh, bool dynamic = false) {
-        _dynamic = dynamic;
-        assertgl!glGenBuffers(1, &_vertexBuffer);
-        assertgl!glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);
-        assertgl!glBufferData(GL_ARRAY_BUFFER, mesh.vertexFormat.vertexSize * mesh.vertexCount, null, _dynamic ? GL_DYNAMIC_DRAW : GL_STATIC_DRAW);
-    }
-    void setVertexData(float[] data) {
-        assertgl!glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);
-        assertgl!glBufferData(GL_ARRAY_BUFFER, float.sizeof * cast(int)data.length , data.ptr, _dynamic ? GL_DYNAMIC_DRAW : GL_STATIC_DRAW);
-    }
-    ~this() {
-        if (_vertexBuffer) {
-            checkgl!glDeleteBuffers(1, &_vertexBuffer);
-            _vertexBuffer = 0;
-        }
-    }
+class VertexBufferBase {
+    /// bind into current context
+    void bind() {}
+    /// unbind from current context
+    void unbind() {}
+    /// set or change data
+    void setData(Mesh mesh) { }
 }
 
-class VertexAttributeBinding {
-    protected GLuint _handle;
-    this(Mesh mesh) {
+class VertexBuffer : VertexBufferBase {
+    protected VertexFormat _format;
+    protected GLuint _vertexBuffer;
+    protected GLuint _indexBuffer;
+    protected GLuint _vao;
+
+    this() {
+        assertgl!glGenBuffers(1, &_vertexBuffer);
+        assertgl!glGenBuffers(1, &_indexBuffer);
+        assertgl!glGenVertexArrays(1, &_vao);
+    }
+
+    ~this() {
+        checkgl!glDeleteBuffers(1, &_vertexBuffer);
+        checkgl!glDeleteBuffers(1, &_indexBuffer);
+        checkgl!glDeleteVertexArrays(1, &_vao);
+    }
+
+    /// bind into current context
+    override void bind() {
+        glBindVertexArray(_vao);
+    }
+
+    /// unbind from current context
+    override void unbind() {
+        checkgl!glBindVertexArray(0);
         checkgl!glBindBuffer(GL_ARRAY_BUFFER, 0);
         checkgl!glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
-        checkgl!glGenVertexArrays(1, &_handle);
-        if (!_handle) {
-            Log.e("Cannot generate vertex array id");
-            return;
-        }
-        checkgl!glBindVertexArray(_handle);
-        //glBindBuffer(_handle, 
-        checkgl!glBindVertexArray(0);
     }
-    ~this() {
-        if (_handle) {
-            checkgl!glDeleteVertexArrays(1, &_handle);
-        }
+
+    void updateVertexFormat() {
+        // TODO: use vertex attributes from format and shaders
+        glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, _format.vertexSize, cast(char*)(0));
+        glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, _format.vertexSize, cast(char*)(float.sizeof*3));
+        glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, _format.vertexSize, cast(char*)(float.sizeof*6));
+
+        glEnableVertexAttribArray(0);
+        glEnableVertexAttribArray(1);
+        glEnableVertexAttribArray(2);
+    }
+
+    /// set or change data
+    override void setData(Mesh mesh) {
+        _format = mesh.vertexFormat;
+        // vertex buffer
+        checkgl!glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);
+        checkgl!glBufferData(GL_ARRAY_BUFFER, _format.vertexSize * mesh.vertexCount, mesh.vertexData.ptr, GL_STATIC_DRAW);
+        // index buffer
+        checkgl!glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer);
+        const(ushort[]) indexData = mesh.indexData;
+        checkgl!glBufferData(GL_ELEMENT_ARRAY_BUFFER, ushort.sizeof * mesh.indexData.length, indexData.ptr, GL_STATIC_DRAW);
+        // vertex layout
+        checkgl!glBindVertexArray(_vao);
+        // specify vertex buffer
+        checkgl!glBindBuffer(GL_ARRAY_BUFFER, _vertexBuffer);
+        // set vertex buffer format
+        updateVertexFormat();
+        // specify index buffer
+        checkgl!glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, _indexBuffer);
+
+        unbind();
     }
 }

src/dlangui/graphics/scene/mesh.d

@@ -87,7 +87,7 @@ struct VertexFormat {
         return false;
     }
     /// compare
-    bool opEquals(immutable ref VertexFormat fmt) {
+    bool opEquals(immutable ref VertexFormat fmt) const {
         if (_vertexSize != fmt._vertexSize)
             return false;
         for(int i = 0; i < _elements.length; i++)
@@ -105,6 +105,9 @@ class Mesh {
     protected MeshPart[] _parts;
 
     @property ref const(VertexFormat) vertexFormat() const { return _vertexFormat; }
+
+    @property VertexFormat vertexFormat() { return _vertexFormat; }
+
     @property void vertexFormat(VertexFormat format) { 
         assert(_vertexCount == 0);
         _vertexFormat = format; 
@@ -112,6 +115,28 @@ class Mesh {
     /// returns vertex count
     @property int vertexCount() const { return _vertexCount; }
 
+    /// returns vertex data array
+    @property const(float[]) vertexData() const { return _vertexData; }
+
+    /// return index data for all parts
+    @property const(ushort[]) indexData() const {
+        if (!_parts)
+            return null;
+        if (_parts.length == 1)
+            return _parts[0].data;
+        int sz = 0;
+        foreach(p; _parts)
+            sz += p.length;
+        ushort[] res;
+        res.length = 0;
+        int pos = 0;
+        foreach(p; _parts) {
+            res[pos .. pos + p.length] = p.data[0 .. $];
+            pos += p.length;
+        }
+        return res;
+    }
+
     /// mesh part count
     @property int partCount() const { return cast(int)_parts.length; }
     /// returns mesh part by index
@@ -122,7 +147,7 @@ class Mesh {
         return meshPart;
     }
 
-    MeshPart addPart(PrimitiveType type, int[] indexes) {
+    MeshPart addPart(PrimitiveType type, ushort[] indexes) {
         return addPart(new MeshPart(type, indexes));
     }
 
@@ -166,14 +191,14 @@ enum PrimitiveType : int {
 /// Mesh part - set of vertex indexes with graphics primitive type
 class MeshPart {
     protected PrimitiveType _type;
-    protected int[] _indexData;
-    this(PrimitiveType type, int[] indexes = null) {
+    protected ushort[] _indexData;
+    this(PrimitiveType type, ushort[] indexes = null) {
         _type = type;
         _indexData.assumeSafeAppend;
         add(indexes);
     }
 
-    void add(int[] indexes) {
+    void add(ushort[] indexes) {
         if (indexes.length)
             _indexData ~= indexes;
     }
@@ -188,5 +213,5 @@ class MeshPart {
     @property int length() const { return cast(int)_indexData.length; }
 
     /// index data
-    @property int[] data() { return _indexData; }
+    @property const(ushort[]) data() const { return _indexData; }
 }