DragonEngine/Skybox.cpp at master · Dartemiss/DragonEngine · GitHub

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#include "Skybox.h"
#include "GL/glew.h"
#include "Application.h"
#include "ModuleTexture.h"
#include "ModuleProgram.h"
#include "ModuleCamera.h"
#include "ComponentCamera.h"
#include "MathGeoLib/Math/float4.h"
#include <DevIL/il.h>
#include <DevIL/ilu.h>
#include <DevIL/ilut.h>

Skybox::Skybox()
{
	directory = "../Textures/Skybox/";

	std::vector<std::string> faces
	{
			"skybox_right",
			"skybox_left",
			"skybox_top",
			"skybox_bottom",
			"skybox_front",
			"skybox_back"
	};


	//Load default Skybox
	cubemapTexture = LoadCubeMap(faces);


	float skyboxVertices[] = {
		// positions
		-1.0f,  1.0f, -1.0f,
		-1.0f, -1.0f, -1.0f,
		 1.0f, -1.0f, -1.0f,
		 1.0f, -1.0f, -1.0f,
		 1.0f,  1.0f, -1.0f,
		-1.0f,  1.0f, -1.0f,

		-1.0f, -1.0f,  1.0f,
		-1.0f, -1.0f, -1.0f,
		-1.0f,  1.0f, -1.0f,
		-1.0f,  1.0f, -1.0f,
		-1.0f,  1.0f,  1.0f,
		-1.0f, -1.0f,  1.0f,

		 1.0f, -1.0f, -1.0f,
		 1.0f, -1.0f,  1.0f,
		 1.0f,  1.0f,  1.0f,
		 1.0f,  1.0f,  1.0f,
		 1.0f,  1.0f, -1.0f,
		 1.0f, -1.0f, -1.0f,

		-1.0f, -1.0f,  1.0f,
		-1.0f,  1.0f,  1.0f,
		 1.0f,  1.0f,  1.0f,
		 1.0f,  1.0f,  1.0f,
		 1.0f, -1.0f,  1.0f,
		-1.0f, -1.0f,  1.0f,

		-1.0f,  1.0f, -1.0f,
		 1.0f,  1.0f, -1.0f,
		 1.0f,  1.0f,  1.0f,
		 1.0f,  1.0f,  1.0f,
		-1.0f,  1.0f,  1.0f,
		-1.0f,  1.0f, -1.0f,

		-1.0f, -1.0f, -1.0f,
		-1.0f, -1.0f,  1.0f,
		 1.0f, -1.0f, -1.0f,
		 1.0f, -1.0f, -1.0f,
		-1.0f, -1.0f,  1.0f,
		 1.0f, -1.0f,  1.0f
	};


	glGenVertexArrays(1, &skyboxVAO);
	glGenBuffers(1, &skyboxVBO);
	glBindVertexArray(skyboxVAO);
	glBindBuffer(GL_ARRAY_BUFFER, skyboxVBO);
	glBufferData(GL_ARRAY_BUFFER, sizeof(skyboxVertices), &skyboxVertices, GL_STATIC_DRAW);
	glEnableVertexAttribArray(0);
	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);

}


Skybox::~Skybox()
{
	glDeleteVertexArrays(1, &skyboxVAO);
	glDeleteBuffers(1, &skyboxVBO);
	glDeleteTextures(1, &cubemapTexture);

}

unsigned int Skybox::LoadCubeMap(const std::vector<std::string> &faces)
{
	unsigned int textureID;
	glGenTextures(1, &textureID);
	glBindTexture(GL_TEXTURE_CUBE_MAP, textureID);

	for (unsigned int i = 0; i < faces.size(); i++)
	{
		App->texture->LoadSkybox(faces[i].c_str(), i);
	}
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);

	return textureID;
}

void Skybox::DrawSkybox() const
{
	glDepthFunc(GL_LEQUAL);
	unsigned int skyboxProg = App->program->skyboxProg;
	glUseProgram(skyboxProg);

	// ... set view and projection matrix
	glUniformMatrix4fv(glGetUniformLocation(skyboxProg,
		"projection"), 1, GL_TRUE, &App->camera->editorCamera->proj[0][0]);

	float4x4 view = App->camera->editorCamera->view;
	view.SetRow(3, float4::zero);
	view.SetCol(3, float4::zero);

	glUniformMatrix4fv(glGetUniformLocation(skyboxProg,
		"view"), 1, GL_TRUE, &view[0][0]);

	glBindVertexArray(skyboxVAO);
	glActiveTexture(GL_TEXTURE0);
	glBindTexture(GL_TEXTURE_CUBE_MAP, cubemapTexture);
	glDrawArrays(GL_TRIANGLES, 0, 36);
	glBindVertexArray(0);

	glDepthFunc(GL_LESS);
	glUseProgram(0);
}