Implement spritebatch properly.

src/duskgl/display/mesh/meshgl.c

@@ -21,9 +21,10 @@ errorret_t meshInitGL(
 
   mesh->primitiveType = primitiveType;
   mesh->vertexCount = vertexCount;
+  mesh->vertices = vertices;
 
   #ifdef DUSK_OPENGL_LEGACY
-    mesh->vertices = vertices;
+    // Nothing needed.
   #else
     // Generate Vertex Buffer Object
     glGenBuffers(1, &mesh->vboId);
@@ -34,7 +35,7 @@ errorret_t meshInitGL(
       GL_ARRAY_BUFFER,
       vertexCount * sizeof(meshvertex_t),
       vertices,
-      GL_STATIC_DRAW
+      GL_DYNAMIC_DRAW
     );
     errorChain(errorGLCheck());
 
@@ -93,6 +94,27 @@ errorret_t meshInitGL(
   errorOk();
 }
 
+errorret_t meshFlushGL(
+  meshgl_t *mesh,
+  const int32_t vertOffset,
+  const int32_t vertCount
+) {
+  #ifdef DUSK_OPENGL_LEGACY
+    // Nothing doing, we use the glClientState stuff.
+  #else
+    glBindBuffer(GL_ARRAY_BUFFER, mesh->vboId);
+    errorChain(errorGLCheck());
+    glBufferData(
+      GL_ARRAY_BUFFER,
+      vertCount * sizeof(meshvertex_t),
+      &mesh->vertices[vertOffset],
+      GL_DYNAMIC_DRAW
+    );
+    errorChain(errorGLCheck());
+  #endif
+  errorOk();
+}
+
 errorret_t meshDrawGL(
   const meshgl_t *mesh,
   const int32_t offset,

src/duskgl/display/mesh/meshgl.h

@@ -18,9 +18,10 @@ typedef enum {
 typedef struct {
   int32_t vertexCount;
   meshprimitivetypegl_t primitiveType;
+  const meshvertex_t *vertices;
   
   #ifdef DUSK_OPENGL_LEGACY
-    const meshvertex_t *vertices;
+    // Nothing needed
   #else
     GLuint vaoId;
     GLuint vboId;
@@ -43,6 +44,20 @@ errorret_t meshInitGL(
   const meshvertex_t *vertices
 );
 
+/**
+ * Flushes the vertices (stored in memory) to the GPU.
+ * 
+ * @param mesh Mesh to flush vertices for.
+ * @param vertOffset First vertice index to flush.
+ * @param vertCount Count of vertices to flush.
+ * @return Error state.
+ */
+errorret_t meshFlushGL(
+  meshgl_t *mesh,
+  const int32_t vertOffset,
+  const int32_t vertCount
+);
+
 /**
  * Draws a mesh using OpenGL.
  * 

src/duskgl/display/mesh/meshplatform.h

@@ -12,6 +12,7 @@ typedef meshprimitivetypegl_t meshprimitivetypeplatform_t;
 typedef meshgl_t meshplatform_t;
 
 #define meshInitPlatform meshInitGL
+#define meshFlushPlatform meshFlushGL
 #define meshDrawPlatform meshDrawGL
 #define meshGetVertexCountPlatform meshGetVertexCountGL
 #define meshDisposePlatform meshDisposeGL