chore: decouple rendering & geometry generation logic

src/application/applicationstate.c

@@ -61,8 +61,7 @@ static void appstate_on_color_change(VektorColorWheel* wheel,
     gtk_editable_set_text(GTK_EDITABLE(appstate->widgetState->sidepanelEntryB),
                           str_b);
 
-    /*gtk_gl_area_queue_render(
+    vektor_canvas_geometry_changed(appstate->renderInfo);
-        GTK_GL_AREA(appstate->widgetState->workspaceCanvas));*/
 }
 
 static void appstate_on_entry_update(GtkEntry* entry, gpointer user_data) {
@@ -96,7 +95,11 @@ static void canvas_onclick(GtkGestureClick* gesture, int n_press, double x,
     vektor_appstate_canvas_click(state, normalized_coords.x,
                                  normalized_coords.y);
 
-    // gtk_gl_area_queue_render(GTK_GL_AREA(widget));
+    // technically there are cases when a click would not result in change of the geometry
+    // but this is more concise then writing it inside that function
+    // a bunch of times and burder future click dispatches with
+    // handling this signal
+    vektor_canvas_geometry_changed(state->renderInfo);
 }
 
 void vektor_appstate_canvas_click(VektorAppState* state, double x, double y) {
@@ -253,6 +256,7 @@ void vektor_appstate_canvas_drag_begin(GtkGestureDrag* gesture, gdouble x,
             if(vektor_bbox_isinside(bbox, position)) {
                  // clicked inside handle
                 state->heldHandleIndex = i;
+                vektor_canvas_geometry_changed(state->renderInfo);
                 break;
             }
         }
@@ -282,6 +286,7 @@ void vektor_appstate_canvas_drag_update(GtkGestureDrag* gesture, gdouble x,
     if(state->selectedShape != NULL && state->heldHandleIndex != -1) {
         state->selectedShape->handles[state->heldHandleIndex] = position;
         vektor_shape_handles_updated(state->selectedShape, &state->heldHandleIndex);
+        vektor_canvas_geometry_changed(state->renderInfo);
     }
 }
 
@@ -293,6 +298,7 @@ void vektor_appstate_canvas_drag_end(GtkGestureDrag* gesture, gdouble x,
     // if we were dragging a handle
     if(state->selectedShape != NULL && state->heldHandleIndex != -1) {
         state->heldHandleIndex = -1; // ...then remove handle drag flag
+        vektor_canvas_geometry_changed(state->renderInfo);
     }
 }
 

src/ui/vektorcanvas.c

@@ -45,6 +45,7 @@ static GLuint shader_selection_uMaxLoc;
 
 static GLuint vao;
 VertexBuffer vb;
+static size_t shape_vertex_count = 0;
 
 static GLuint compile_shader(GLenum type, const char* src) {
     GLuint shader = glCreateShader(type);
@@ -135,13 +136,11 @@ static void init_geometry(void) {
 
     glBindVertexArray(0);
 }
-static gboolean render(GtkGLArea* a, GdkGLContext* ctx,
-                       VektorCanvasRenderInfo* renderInfo) {
-    vb.count = 0;
 
+void vektor_canvas_geometry_changed(VektorCanvasRenderInfo* renderInfo) {
+    vb.count = 0;
     vektor_rasterize(&vb, renderInfo->shapes, renderInfo->zoom);
-    size_t shape_vertex_count =
+    shape_vertex_count = vb.count;
-        vb.count; // remember how many vertices belong to shapes
 
     if (renderInfo->selectedShape != NULL &&
         *(renderInfo->selectedShape) != NULL) {
@@ -166,6 +165,13 @@ static gboolean render(GtkGLArea* a, GdkGLContext* ctx,
         vektor_vb_add_quad(&vb, bbox.min, bbox.max,
                            vektor_color_new(255, 255, 255, 255));
     }
+}
+
+static gboolean render(GtkGLArea* a, GdkGLContext* ctx,
+                       VektorCanvasRenderInfo* renderInfo) {
+    //vektor_canvas_geometry_changed(renderInfo);
+
+    
 
     glBufferData(GL_ARRAY_BUFFER, vb.count * sizeof(Vertex), vb.vertices,
                  GL_STATIC_DRAW);

src/ui/vektorcanvas.h

@@ -44,6 +44,7 @@ typedef struct VektorCanvasRenderInfo {
 
 void vektor_canvas_init(VektorWidgetState* state, VektorCanvas* canvasOut,
                         VektorCanvasRenderInfo* renderInfo);
+void vektor_canvas_geometry_changed(VektorCanvasRenderInfo* renderInfo);
 // void vektor_canvas_update(VektorCanvas* canvas);
 // void vektor_canvas_fill(VektorCanvas* canvas, VektorColor color);
 // void vektor_canvas_drawfrom(VektorFramebuffer* fb, VektorCanvas* canvas);