From 85f7511207e1eb9031a6915a1498fea108caa038 Mon Sep 17 00:00:00 2001
From: blobt <klm777x7@gmail.com>
Date: Mon, 21 Sep 2020 11:44:22 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0fullscreenquad=E7=B1=BB?=
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---
 fullscreenquad.cpp | 96 ++++++++++++++++++++++++++++++++++++++++++++++
 fullscreenquad.h   | 17 ++++++++
 shader.cpp         |  9 +----
 3 files changed, 114 insertions(+), 8 deletions(-)
 create mode 100644 fullscreenquad.cpp
 create mode 100644 fullscreenquad.h

diff --git a/fullscreenquad.cpp b/fullscreenquad.cpp
new file mode 100644
index 0000000..112671d
--- /dev/null
+++ b/fullscreenquad.cpp
@@ -0,0 +1,96 @@
+#include "fullscreenquad.h"
+
+void FullScreenQuad::Init()
+{
+	mVertexBuffer = new VertexBuffer();
+	mVertexBuffer->SetSize(4);
+	mVertexBuffer->SetTexcoord(0, 0.0f, 0.0f);
+	mVertexBuffer->SetTexcoord(1, 1.0f, 0.0f);
+	mVertexBuffer->SetTexcoord(2, 0.0f, 1.0f);
+	mVertexBuffer->SetTexcoord(3, 1.0f, 1.0f);
+	mShader = new Shader();
+}
+
+void FullScreenQuad::Draw() {
+	//µ¥Î»¾ØÕó
+	float identity[] = {
+		1.0f,0.0f,0.0f,0.0f,
+		0.0f,1.0f,0.0f,0.0f,
+		0.0f,0.0f,1.0f,0.0f,
+		0.0f,0.0f,0.0f,1.0f,
+	};
+	mVertexBuffer->SetPosition(0, -1.0f, -1.0f, 0.0f);
+	mVertexBuffer->SetPosition(1, 1.0f, -1.0f, 0.0f);
+	mVertexBuffer->SetPosition(2, -1.0f, 1.0f, 0.0f);
+	mVertexBuffer->SetPosition(3, 1.0f, 1.0f, 0.0f);
+	mVertexBuffer->Bind();
+	mShader->Bind(identity, identity, identity);
+	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+	mVertexBuffer->Unbind();
+}
+void FullScreenQuad::DrawToLeftTop() {
+	float identity[] = {
+		1.0f,0.0f,0.0f,0.0f,
+		0.0f,1.0f,0.0f,0.0f,
+		0.0f,0.0f,1.0f,0.0f,
+		0.0f,0.0f,0.0f,1.0f,
+	};
+	mVertexBuffer->SetPosition(0, -1.0f, 0.0f, -1.0f);
+	mVertexBuffer->SetPosition(1, 0.0f, 0.0f, -1.0f);
+	mVertexBuffer->SetPosition(2, -1.0f, 1.0f, -1.0f);
+	mVertexBuffer->SetPosition(3, 0.0f, 1.0f, -1.0f);
+	mVertexBuffer->Bind();
+	mShader->Bind(identity, identity, identity);
+	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+	mVertexBuffer->Unbind();
+}
+void FullScreenQuad::DrawToLeftBottom() {
+	float identity[] = {
+		1.0f,0.0f,0.0f,0.0f,
+		0.0f,1.0f,0.0f,0.0f,
+		0.0f,0.0f,1.0f,0.0f,
+		0.0f,0.0f,0.0f,1.0f,
+	};
+	mVertexBuffer->SetPosition(0, -1.0f, -1.0f, -1.0f);
+	mVertexBuffer->SetPosition(1, 0.0f, -1.0f, -1.0f);
+	mVertexBuffer->SetPosition(2, -1.0f, 0.0f, -1.0f);
+	mVertexBuffer->SetPosition(3, 0.0f, 0.0f, -1.0f);
+	mVertexBuffer->Bind();
+	mShader->Bind(identity, identity, identity);
+	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+	mVertexBuffer->Unbind();
+}
+
+void FullScreenQuad::DrawToRightTop() {
+	float identity[] = {
+		1.0f,0.0f,0.0f,0.0f,
+		0.0f,1.0f,0.0f,0.0f,
+		0.0f,0.0f,1.0f,0.0f,
+		0.0f,0.0f,0.0f,1.0f,
+	};
+	mVertexBuffer->SetPosition(0, 0.0f, 0.0f, -1.0f);
+	mVertexBuffer->SetPosition(1, 1.0f, 0.0f, -1.0f);
+	mVertexBuffer->SetPosition(2, 0.0f, 1.0f, -1.0f);
+	mVertexBuffer->SetPosition(3, 1.0f, 1.0f, -1.0f);
+	mVertexBuffer->Bind();
+	mShader->Bind(identity, identity, identity);
+	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+	mVertexBuffer->Unbind();
+}
+
+void FullScreenQuad::DrawToRightBottom() {
+	float identity[] = {
+		1.0f,0.0f,0.0f,0.0f,
+		0.0f,1.0f,0.0f,0.0f,
+		0.0f,0.0f,1.0f,0.0f,
+		0.0f,0.0f,0.0f,1.0f,
+	};
+	mVertexBuffer->SetPosition(0, 0.0f, -1.0f, -1.0f);
+	mVertexBuffer->SetPosition(1, 1.0f, -1.0f, -1.0f);
+	mVertexBuffer->SetPosition(2, 0.0f, 0.0f, -1.0f);
+	mVertexBuffer->SetPosition(3, 1.0f, 0.0f, -1.0f);
+	mVertexBuffer->Bind();
+	mShader->Bind(identity, identity, identity);
+	glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
+	mVertexBuffer->Unbind();
+}
\ No newline at end of file
diff --git a/fullscreenquad.h b/fullscreenquad.h
new file mode 100644
index 0000000..c92dc16
--- /dev/null
+++ b/fullscreenquad.h
@@ -0,0 +1,17 @@
+#pragma once
+#include "ggl.h"
+#include "vertexbuffer.h"
+#include "shader.h"
+
+class FullScreenQuad {
+public:
+	VertexBuffer *mVertexBuffer;
+	Shader *mShader;
+public:
+	void Init();
+	void Draw();
+	void DrawToLeftTop();
+	void DrawToRightTop();
+	void DrawToLeftBottom();
+	void DrawToRightBottom();
+};
\ No newline at end of file
diff --git a/shader.cpp b/shader.cpp
index 92cbd41..31c9acb 100644
--- a/shader.cpp
+++ b/shader.cpp
@@ -183,11 +183,4 @@ GLuint Shader::SetTextureCube(const char * name, GLuint texture) {
 		iter->second->mTexture = texture;
 	}
 	return oldTexture;
-}
-
-
-
-
-
-
-
+}
\ No newline at end of file