From af7bdaa10ee71a319dc55c3c7556fa43a95c9dc9 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Tue, 2 Apr 2019 21:45:33 +0800
Subject: *misc

---
 source/modules/asura-core/graphics/matrix_stack.h | 82 +++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 source/modules/asura-core/graphics/matrix_stack.h

(limited to 'source/modules/asura-core/graphics/matrix_stack.h')

diff --git a/source/modules/asura-core/graphics/matrix_stack.h b/source/modules/asura-core/graphics/matrix_stack.h
new file mode 100644
index 0000000..1923b30
--- /dev/null
+++ b/source/modules/asura-core/graphics/matrix_stack.h
@@ -0,0 +1,82 @@
+#ifndef __ASURA_MATRIX_STACK_H__
+#define __ASURA_MATRIX_STACK_H__
+
+#include <asura-utils/type.h>
+#include <asura-utils/math/matrix44.h>
+
+namespace AsuraEngine
+{
+	namespace Graphics
+	{
+
+		///
+		/// 栈的矩阵深度。
+		///
+#define ASURA_MAX_MATRIX_STACK_DEPTH 32 // 2KB
+
+		///
+		/// 保存栈状态，用来恢复之前的状态。栈中的一个矩阵stack[i]的值是stack[0]*..*stack[i-1]
+		/// 的值，并附加一系列transform。
+		/// 
+		/// TODO: template<uint _capacity> MatrixStack
+		///
+		class MatrixStack
+		{
+		public:
+
+			MatrixStack();
+			~MatrixStack();
+
+			///
+			/// 对栈顶元素的操作只能通过以下函数实现
+			///
+			void LoadIdentity();
+			bool Push();
+			bool Pop();
+
+			AEMath::Matrix44& GetTop();
+			void GetTop(asura_out AEMath::Matrix44& mat44);
+
+			void LoadMatrix(const AEMath::Matrix44& mat44);
+			void MultMatrix(const AEMath::Matrix44& mat44);
+
+			///
+			/// 仿射变换
+			///
+			void Rotate(float angle, float x, float y, float z);
+			void Translate(float x, float y, float z);
+			void Scale(float x, float y, float z);
+
+			///
+			/// 投影变换
+			///
+			void Ortho(float left, float right, float bottom, float top, float near, float far);
+			//void Perspective(float fov, float aspect, float near, float far);
+			//void Frustum(float left, float right, float top, float bottom, float near, float far);
+			//void LookAt(float x, float y, float z, float cx, float cy, float cz, float ux, float uy, float uz);
+
+			///
+			/// 获得栈顶的索引，范围在0~ASURA_MAX_MATRIX_STACK_DEPTH-1
+			///
+			uint GetTopIndex();
+
+			///
+			/// 获得最大栈容量，即ASURA_MAX_MATRIX_STACK_DEPTH
+			///
+			uint GetCapacity();
+
+		private: 
+
+			AEMath::Matrix44 mStack[ASURA_MAX_MATRIX_STACK_DEPTH];
+
+			///
+			/// 栈顶索引，0~ASURA_MAX_MATRIX_STACK_DEPTH-1
+			///
+			uint8 top;
+
+		};
+
+	}
+}
+
+#endif
\ No newline at end of file
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