Open source Star Ruler 2 source code!

source/game/scene/frame_line.cpp

@@ -0,0 +1,42 @@
+#include "frame_line.h"
+#include "render/driver.h"
+#include "render/vertexBuffer.h"
+#include <algorithm>
+
+extern double frameLen_s;
+
+namespace scene {
+FrameLineNode::FrameLineNode(const render::RenderState& material, float duration) : mat(material), interpDuration(duration), age(0), life(1000.f), fadeAge(1000.f) {
+	setFlag(NF_NoMatrix, true);
+}
+
+bool FrameLineNode::preRender(render::RenderDriver& driver) {
+	if(frameLen_s > 0) {
+		age += (float)frameLen_s;
+		endPos = abs_position.interpolate(prevPos, interpDuration / frameLen_s);
+		prevPos = abs_position;
+	}
+
+	vec3d off = abs_position - driver.cam_pos;
+	sortDistance = off.getLength();
+	return off.dot(driver.cam_facing) > 0;
+}
+
+void FrameLineNode::render(render::RenderDriver& driver) {
+	auto& camPos = driver.cam_pos;
+
+	auto* verts = render::VertexBufferTCV::fetch(&mat)->request(1, render::PT_Lines);
+
+	float alpha = age > fadeAge ? 1.f - std::min((age-fadeAge)/(life-fadeAge), 1.f) : 1.f;
+
+	verts[0].col = startCol;
+	verts[0].col.a *= alpha;
+	verts[0].pos = vec3f(abs_position - camPos);
+	verts[0].uv = vec2f(0,0);
+
+	verts[1].col = endCol;
+	verts[1].col.a *= alpha;
+	verts[1].pos = vec3f(endPos - camPos);
+	verts[1].uv = vec2f(1,0);
+}
+};