From 60cbbdec07ab7a5636eac5b3c024ae44e937f4d4 Mon Sep 17 00:00:00 2001
From: chai <chaifix@163.com>
Date: Mon, 13 Dec 2021 00:07:19 +0800
Subject: +init

---
 Client/Source/Graphics/Shader.cpp | 154 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 154 insertions(+)
 create mode 100644 Client/Source/Graphics/Shader.cpp

(limited to 'Client/Source/Graphics/Shader.cpp')

diff --git a/Client/Source/Graphics/Shader.cpp b/Client/Source/Graphics/Shader.cpp
new file mode 100644
index 0000000..899578b
--- /dev/null
+++ b/Client/Source/Graphics/Shader.cpp
@@ -0,0 +1,154 @@
+#include <exception>
+
+#include "../Debug/log.h"
+#include "Shader.h"
+#include "OpenGL.h"
+#include "ShaderCompiler.h"
+
+using namespace std;
+
+std::string shaderError = "";
+void checkCompileshaderErrorors(GLuint shader, std::string type)
+{
+	GLint success;
+	GLchar infoLog[1024];
+	if (type != "PROGRAM")
+	{
+		glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
+		if (!success)
+		{
+			glGetShaderInfoLog(shader, 1024, NULL, infoLog);
+			shaderError = "ERROR::SHADER_COMPILATION_ERROR of type: " + type + "\n" + infoLog;
+		}
+	}
+	else
+	{
+		glGetProgramiv(shader, GL_LINK_STATUS, &success);
+		if (!success)
+		{
+			glGetProgramInfoLog(shader, 1024, NULL, infoLog);
+			shaderError = "ERROR::SHADER_COMPILATION_ERROR of type: " + type + "\n" + infoLog;
+		}
+	}
+	if (!success)
+	{
+		throw ShaderCompileExecption(shaderError.c_str());
+	}
+}
+
+Shader::Shader()
+{
+}
+
+Shader::Shader(std::string& glsllShader)
+{
+    // stl的string会在大小超过阈值的情况下在栈里分配，并用RAII保证释放
+    std::string vsh ; 
+    std::string fsh ;
+    try
+    {
+        GLSLCompiler::Compile(glsllShader, vsh, fsh, m_Commands);
+    }
+    catch (GLSLCompileException& e)
+    {
+		ReleaseRenderCommandGroup(m_Commands);
+        throw ShaderCompileExecption(e.what());
+    }
+    CompileProgram(vsh.c_str(), fsh.c_str());
+}
+
+Shader::Shader(const char* vert, const char* frag)
+{
+    CompileProgram(vert, frag);
+}
+
+void Shader::CompileProgram(const char* vert, const char* frag, bool keepSrc)
+{
+    const char* vertCode = vert;
+    const char* fragCode = frag;
+    // vertex shader
+    m_VertID = glCreateShader(GL_VERTEX_SHADER);
+    glShaderSource(m_VertID, 1, &vertCode, NULL);//为了支持中文注释，长度传NULL
+    glCompileShader(m_VertID);
+    checkCompileshaderErrorors(m_VertID, "VERTEX");
+    // fragment Shader
+    m_FragID = glCreateShader(GL_FRAGMENT_SHADER);
+    glShaderSource(m_FragID, 1, &fragCode, NULL);
+    glCompileShader(m_FragID);
+    checkCompileshaderErrorors(m_FragID, "FRAGMENT");
+    // create program
+    m_ProgramID = glCreateProgram();
+    glAttachShader(m_ProgramID, m_VertID);
+    glAttachShader(m_ProgramID, m_FragID);
+    glLinkProgram(m_ProgramID);
+    checkCompileshaderErrorors(m_ProgramID, "PROGRAM");
+}
+
+Shader::~Shader()
+{
+	glDeleteProgram(m_ProgramID);
+	glDeleteShader(m_VertID);
+	glDeleteShader(m_FragID);
+}
+
+void Shader::ReCompile(std::string& vert, std::string frag)
+{
+	const char* vertCode = vert.c_str();
+	const char* fragCode = frag.c_str();
+	// vertex shader
+	glShaderSource(m_VertID, 1, &vertCode, NULL);
+	glCompileShader(m_VertID);
+	checkCompileshaderErrorors(m_VertID, "VERTEX");
+	// fragment Shader
+	glShaderSource(m_FragID, 1, &fragCode, NULL);
+	glCompileShader(m_FragID);
+	checkCompileshaderErrorors(m_FragID, "FRAGMENT");
+	// create program
+	glAttachShader(m_ProgramID, m_VertID);
+	glAttachShader(m_ProgramID, m_FragID);
+	glLinkProgram(m_ProgramID);
+	checkCompileshaderErrorors(m_FragID, "PROGRAM");
+}
+
+void Shader::ReCompileVert(std::string& vert)
+{
+	glDeleteShader(m_VertID);
+	const char* vertCode = vert.c_str();
+	// vertex shader
+	glShaderSource(m_VertID, 1, &vertCode, NULL);
+	glCompileShader(m_VertID);
+	checkCompileshaderErrorors(m_VertID, "VERTEX");
+	// create program
+	glAttachShader(m_ProgramID, m_VertID);
+	glAttachShader(m_ProgramID, m_FragID);
+	glLinkProgram(m_ProgramID);
+	checkCompileshaderErrorors(m_FragID, "PROGRAM");
+}
+
+void Shader::ReCompileFrag(std::string frag)
+{
+	glDeleteShader(m_FragID);
+	const char* fragCode = frag.c_str();
+	// fragment Shader
+	glShaderSource(m_FragID, 1, &fragCode, NULL);
+	glCompileShader(m_FragID);
+	checkCompileshaderErrorors(m_FragID, "FRAGMENT");
+	// create program
+	glAttachShader(m_ProgramID, m_VertID);
+	glAttachShader(m_ProgramID, m_FragID);
+	glLinkProgram(m_ProgramID);
+	checkCompileshaderErrorors(m_FragID, "PROGRAM");
+}
+
+bool Shader::IsValid()
+{
+	return m_ProgramID != 0;
+}
+
+void Shader::ExecuteCommand()
+{
+	for (int i = 0; i < m_Commands.size(); ++i)
+	{
+		m_Commands[i]->Execute();
+	}
+}
\ No newline at end of file
-- 
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