From 3898f2c648b1a731dead8337aad8912d2b8b80d7 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Tue, 2 Nov 2021 21:52:09 +0800
Subject: *misc

---
 Runtime/GUI/UIQuad.cpp | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 Runtime/GUI/UIQuad.cpp

(limited to 'Runtime/GUI/UIQuad.cpp')

diff --git a/Runtime/GUI/UIQuad.cpp b/Runtime/GUI/UIQuad.cpp
new file mode 100644
index 0000000..089d0e1
--- /dev/null
+++ b/Runtime/GUI/UIQuad.cpp
@@ -0,0 +1,63 @@
+#include "../Math/Vector2.h"
+#include "../Graphics/GfxDevice.h"
+#include "UIQuad.h"
+
+struct UIQuadLayout
+{
+	Internal::Vector2 position;
+	Internal::Vector2 uv;
+};
+
+static CustomVertexLayout layout;
+
+InitializeStaticVariables([]() {
+	VertexAttributeDescriptor POSITION = VertexAttributeDescriptor(0, 2, VertexAttrFormat_Float, sizeof(UIQuadLayout));
+	VertexAttributeDescriptor UV = VertexAttributeDescriptor(sizeof(Internal::Vector2), 2, VertexAttrFormat_Float, sizeof(UIQuadLayout));
+
+	layout.attributes.push_back(POSITION);
+	layout.attributes.push_back(UV);
+});
+
+void UIQuad::Draw()
+{
+	const int nVerts = 4;
+	const int nIndices = 6;
+
+	float pos[] = {
+		m_Left,  m_Bottom, // left-bottom
+		m_Right, m_Bottom, // right-bottom
+		m_Right, m_Top,    // right-top
+		m_Left,  m_Top,    // top-left
+	};
+
+	float uv[] = {
+		0, 0,
+		1, 0,
+		1, 1,
+		0, 1,
+	};
+
+	int indices[] = {
+		0, 1, 3, // right-top  
+		1, 2, 3, // left-bottom
+	};
+
+	uint8* vb;
+	uint16* ib;
+	
+	g_SharedVBO.GetChunk(sizeof(UIQuadLayout), sizeof(uint16), 4, 6, Primitive_Triangle, (void**)&vb, (void**)&ib);
+
+	UIQuadLayout* dst = (UIQuadLayout*)vb;
+
+	for (int i = 0; i < nVerts; ++i)
+	{
+		dst[i].position.Set(pos[2 * i], pos[2 * i + 1]);
+		dst[i].uv.Set(uv[2 * i], uv[2 * i + 1]);
+	}
+
+	for (int i = 0; i < nIndices; ++i)
+		ib[i] = indices[i];
+
+	g_SharedVBO.ReleaseChunk(4, 6);
+	g_SharedVBO.DrawChunk(layout);
+}
\ No newline at end of file
-- 
cgit v1.1-26-g67d0