Added width to trigger line rendering, abstracted PhysX away a bit

renderer/line_rendering.jai

@@ -0,0 +1,89 @@
+MAX_LINES :: 4096;
+line_pipeline: Pipeline_State_Handle;
+
+Line_Point :: struct {
+    position: Vector3;
+    width: float;
+}
+
+Line :: struct {
+    points: Static_Array(Line_Point, 1024);
+    color: Color;
+}
+
+lines: [..] Line;
+
+init_line_rendering :: () {
+    line_vertex_buffer = create_vertex_buffer(engine.renderer, null, size_of(Line_Vertex) * MAX_LINES * 6, stride=size_of(Line_Vertex), mappable=true);
+
+    {
+        vs := create_vertex_shader(engine.renderer, "../assets/shaders/line.hlsl", "VS", mesh_data_types = .[.POSITION, .COLOR]);
+        ps := create_pixel_shader(engine.renderer, "../assets/shaders/line.hlsl", "PS");
+
+        line_pipeline = create_pipeline_state(engine.renderer, vs, ps, blend_type=.TRANSPARENT);
+    }
+
+    array_reserve(*lines, 4096);
+}
+
+begin_line :: (color: Color) {
+    current_line = .{};
+    current_line.color = color;
+}
+
+end_line :: () {
+    array_add(*lines, current_line);
+}
+
+add_line_point :: (position: Vector3, width: float) {
+    array_add(*current_line.points, .{position, width});
+}
+
+add_line :: (from: Vector3, to: Vector3, color: Color = .{1,1,1,1}, line_width: float = 0.1) {
+    hw := line_width*0.5; // @Incomplete
+
+    up := -engine.current_scene.camera.forward;
+    forward := normalize(to - from);
+    right := cross(up, forward);
+
+    line_dir := normalize(to - from);
+    view_dir := normalize(engine.current_scene.camera.position - (from + to) * 0.5);
+    offset_dir := normalize(cross(line_dir, view_dir)) * hw;
+
+    array_add(*line_vertices, .{from + offset_dir, color});
+    array_add(*line_vertices, .{to + offset_dir,   color});
+    array_add(*line_vertices, .{from - offset_dir, color});
+
+    array_add(*line_vertices, .{to + offset_dir,   color});
+    array_add(*line_vertices, .{to - offset_dir,   color});
+    array_add(*line_vertices, .{from - offset_dir, color});
+}
+
+render_lines :: () {
+    if line_vertices.count > 0 {
+        upload_data_to_buffer(engine.renderer, line_vertex_buffer, line_vertices.data, size_of(Line_Vertex) * line_vertices.count);
+
+        push_cmd_set_draw_mode(engine.renderer, .FILL);
+        push_cmd_set_depth_write(engine.renderer, true);
+        push_cmd_set_cull_face(engine.renderer, .NONE);
+        push_cmd_set_pipeline_state(engine.renderer, line_pipeline);
+
+        push_cmd_set_constant_buffer(engine.renderer, 0, engine.camera_buffer, .VERTEX);
+
+        push_cmd_set_vertex_buffer(engine.renderer, line_vertex_buffer);
+
+        push_cmd_draw(engine.renderer, xx line_vertices.count);
+    }
+
+    line_vertices.count = 0;
+}
+
+#scope_file
+
+Line_Vertex :: struct {
+    position: Vector3;
+    color: Color;
+}
+
+line_vertex_buffer: Buffer_Handle;
+line_vertices: [..] Line_Vertex;