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shaderClass.h

@@ -0,0 +1,68 @@
+#ifndef  SHADER_CLASS_H
+#define SHADER_CLASS_H
+
+#include<glad/glad.h>
+#include<GLFW/glfw3.h>
+#include<glm/glm.hpp>
+
+#include<string>
+#include<unordered_map>
+#include<fstream>
+#include  <sstream>
+#include <iostream>
+#include <cerrno>
+
+std::string get_file_contents(const char* filename);
+
+class Shader {
+public:
+	GLuint ID;
+	Shader(const char* vertexFile, const char* fragFile);
+	
+	void Set1F(const char* uniform, float value) {
+		glUniform1f(GetLocation(uniform), value);
+	};
+
+	void Set2F(const char* uniform, glm::vec2 value) {
+		glUniform2f(GetLocation(uniform), value.x,value.y);
+	};
+
+	void Set3F(const char* uniform, glm::vec3 value) {
+		glUniform3f(GetLocation(uniform), value.x,value.y,value.z);
+	};
+	void Set4F(const char* uniform, glm::vec4 value) {
+		glUniform4f(GetLocation(uniform), value.x, value.y, value.z, value.w);
+	};
+	void SetMat4(const char* uniform, glm::mat4 value) {
+		glUniformMatrix4fv(GetLocation(uniform),1,GL_FALSE,&value[0][0]);
+	};
+
+	// Uploads a whole uniform array in one call
+	void SetMat4Array(const char* uniform, const glm::mat4* values, int count) {
+		glUniformMatrix4fv(GetLocation(uniform),count,GL_FALSE,&values[0][0][0]);
+	};
+
+	void SetInt(const char* uniform, GLuint value) {
+		glUniform1i(GetLocation(uniform), value);
+	};
+
+	void Activate();
+	void Delete();
+
+private:
+	// Asking the driver is slow and locations never change once linked.
+	// Uniforms the shader doesn't have cache as -1, which glUniform ignores.
+	GLint GetLocation(const char* uniform) {
+		auto existing = uniformLocations.find(uniform);
+		if (existing != uniformLocations.end())
+			return existing->second;
+
+		GLint location = glGetUniformLocation(ID, uniform);
+		uniformLocations.emplace(uniform, location);
+		return location;
+	}
+
+	std::unordered_map<std::string, GLint> uniformLocations;
+};
+
+#endif