Merge pull request 'skybox' (#2) from skybox into master

Reviewed-on: #2

grk/project/grk-project.vcxproj

@@ -48,6 +48,8 @@
     <None Include="shaders\shader_9_1.vert" />
     <None Include="shaders\shader_8_sun.frag" />
     <None Include="shaders\shader_8_sun.vert" />
+    <None Include="shaders\shader_skybox.frag" />
+    <None Include="shaders\shader_skybox.vert" />
     <None Include="shaders\test.frag" />
     <None Include="shaders\test.vert" />
   </ItemGroup>

grk/project/grk-project.vcxproj.filters

@@ -130,5 +130,11 @@
     <None Include="shaders\test.vert">
       <Filter>Shader Files</Filter>
     </None>
+    <None Include="shaders\shader_skybox.frag">
+      <Filter>Shader Files</Filter>
+    </None>
+    <None Include="shaders\shader_skybox.vert">
+      <Filter>Shader Files</Filter>
+    </None>
   </ItemGroup>
 </Project>

grk/project/models/cube.obj

@@ -0,0 +1,40 @@
+# Blender v2.90.0 OBJ File: ''
+# www.blender.org
+mtllib cube.mtl
+o Cube
+v -10.000000 -10.000000 10.000000
+v -10.000000 10.000000 10.000000
+v -10.000000 -10.000000 -10.000000
+v -10.000000 10.000000 -10.000000
+v 10.000000 -10.000000 10.000000
+v 10.000000 10.000000 10.000000
+v 10.000000 -10.000000 -10.000000
+v 10.000000 10.000000 -10.000000
+vt 0.375000 0.000000
+vt 0.625000 0.000000
+vt 0.625000 0.250000
+vt 0.375000 0.250000
+vt 0.625000 0.500000
+vt 0.375000 0.500000
+vt 0.625000 0.750000
+vt 0.375000 0.750000
+vt 0.625000 1.000000
+vt 0.375000 1.000000
+vt 0.125000 0.500000
+vt 0.125000 0.750000
+vt 0.875000 0.500000
+vt 0.875000 0.750000
+vn -1.0000 0.0000 0.0000
+vn 0.0000 0.0000 -1.0000
+vn 1.0000 0.0000 0.0000
+vn 0.0000 0.0000 1.0000
+vn 0.0000 -1.0000 0.0000
+vn 0.0000 1.0000 0.0000
+usemtl _PBR
+s 1
+f 1/1/1 2/2/1 4/3/1 3/4/1
+f 3/4/2 4/3/2 8/5/2 7/6/2
+f 7/6/3 8/5/3 6/7/3 5/8/3
+f 5/8/4 6/7/4 2/9/4 1/10/4
+f 3/11/5 7/6/5 5/8/5 1/12/5
+f 8/5/6 4/13/6 2/14/6 6/7/6

grk/project/shaders/shader_skybox.frag

@@ -0,0 +1,12 @@
+#version 430 core
+
+uniform samplerCube skybox;
+
+in vec3 texCoord;
+
+out vec4 out_color;
+
+void main()
+{
+    out_color = texture(skybox,texCoord);
+}

grk/project/shaders/shader_skybox.vert

@@ -0,0 +1,13 @@
+#version 430 core
+
+layout(location = 0) in vec3 vertexPosition;
+
+uniform mat4 transformation;
+
+out vec3 texCoord;
+
+void main()
+{
+    texCoord = vertexPosition;
+    gl_Position = transformation * vec4(vertexPosition, 1.0);
+}

grk/project/src/Render_Utils.cpp

@@ -189,3 +189,16 @@ void Core::drawObjectPBR(Core::RenderContext& context, glm::mat4 modelMatrix, gl
     glUniform1f(glGetUniformLocation(program, "spotlightPhi"), spaceship->spotlightPhi);
     Core::DrawContext(context);
 }
+void Core::drawSkybox(Core::RenderContext& context, glm::mat4 modelMatrix, GLuint textureID, GLuint program) {
+    Spaceship* spaceship = Spaceship::getInstance();
+    glDisable(GL_DEPTH_TEST);
+    glUseProgram(program);
+    glm::mat4 viewProjectionMatrix = Core::createPerspectiveMatrix() * spaceship->createCameraMatrix();
+    glm::mat4 transformation = viewProjectionMatrix * modelMatrix;
+    glUniformMatrix4fv(glGetUniformLocation(program, "transformation"), 1, GL_FALSE, (float*)&transformation);
+ 
+    glBindTexture(GL_TEXTURE_CUBE_MAP, textureID);
+    Core::DrawContext(context);
+    glEnable(GL_DEPTH_TEST);
+
+}

grk/project/src/Render_Utils.h

@@ -69,6 +69,7 @@ namespace Core
 	void DrawVertexArray(const VertexData & data);
 
 	void DrawContext(RenderContext& context);
+	void drawSkybox(Core::RenderContext& context, glm::mat4 modelMatrix, GLuint textureID, GLuint program);
 
 	glm::mat4 createPerspectiveMatrix();
 	void drawObjectPBR(Core::RenderContext& context, glm::mat4 modelMatrix, glm::vec3 color, float roughness, float metallic, GLuint program);

grk/project/src/Texture.cpp

@@ -28,6 +28,43 @@ GLuint Core::LoadTexture( const char * filepath )
 
 	return id;
 }
+GLuint Core::LoadCubemap(const std::vector<std::string>& faces)
+{
+	GLuint textureID;
+	glGenTextures(1, &textureID);
+	glBindTexture(GL_TEXTURE_CUBE_MAP, textureID);
+
+	int width, height;
+	unsigned char* data;
+
+	for (unsigned int i = 0; i < faces.size(); i++)
+	{
+		data = SOIL_load_image(("textures/skybox/" + faces[i]).c_str(), &width, &height, 0, SOIL_LOAD_RGBA);
+
+		if (data)
+		{
+			glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
+			SOIL_free_image_data(data);
+		}
+		else
+		{
+			std::cerr << "Cubemap tex failed to load at path:" << faces[i] << std::endl;
+			SOIL_free_image_data(data);
+			glDeleteTextures(1, &textureID);
+			return 0;
+		}
+	}
+
+	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_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 Core::SetActiveTexture(GLuint textureID, const char * shaderVariableName, GLuint programID, int textureUnit)
 {

grk/project/src/Texture.h

@@ -2,10 +2,13 @@
  
 #include "glew.h"
 #include "freeglut.h"
+#include <vector>
+#include <string>
 
 namespace Core
 {
 	GLuint LoadTexture(const char * filepath);
+	GLuint LoadCubemap(const std::vector<std::string>& faces);
 
 	// textureID - identyfikator tekstury otrzymany z funkcji LoadTexture
 	// shaderVariableName - nazwa zmiennej typu 'sampler2D' w shaderze, z ktora ma zostac powiazana tekstura

grk/project/src/ex_9_1.hpp

@@ -5,10 +5,11 @@
 #include <iostream>
 #include <cmath>
 #include <list>
+#include <vector>
 
 #include "Shader_Loader.h"
 #include "Render_Utils.h"
-//#include "Texture.h"
+#include "texture.h"
 
 #include "Box.cpp"
 #include <assimp/Importer.hpp>
@@ -29,6 +30,10 @@ namespace models {
 	Core::RenderContext marbleBustContext;
 	Core::RenderContext spaceshipContext;
 	Core::RenderContext sphereContext;
+	Core::RenderContext cubeContext;
+}
+namespace texture {
+	GLuint cubemapTexture;
 }
 
 GLuint depthMapFBO;
@@ -38,6 +43,7 @@ GLuint program;
 GLuint programSun;
 GLuint programTest;
 GLuint programTex;
+GLuint programCubemap;
 
 Core::Shader_Loader shaderLoader;
 
@@ -75,7 +81,6 @@ void renderShadowapSun() {
 	glBindFramebuffer(GL_FRAMEBUFFER, 0);
 	glViewport(0, 0, WIDTH, HEIGHT);
 }
-
 void renderScene(GLFWwindow* window)
 {
 	glClearColor(0.4f, 0.4f, 0.8f, 1.0f);
@@ -84,6 +89,9 @@ void renderScene(GLFWwindow* window)
 	updateDeltaTime(time);
 	renderShadowapSun();
 
+	drawSkybox(models::cubeContext, glm::translate(glm::mat4(), spaceship->cameraPos), texture::cubemapTexture, programCubemap);
+
+
 	//space lamp
 	glUseProgram(programSun);
 
@@ -165,7 +173,6 @@ void createSuns() {
 	suns.push_back(&Sun(programSun, models::sphereContext, glm::vec3(200, 150, -100), glm::vec3(0.03633f, 0.151106, 0.103226f), glm::vec3(0.6f, 0.2f, 0.9f), 3.9));
 	suns.push_back(&Sun(programSun, models::sphereContext, glm::vec3(-150, -100, -50), glm::vec3(0.83633f, -0.251106, -0.123226f), glm::vec3(0.7f, 0.5f, 0.8f), 4.1));*/
 }
-
 void init(GLFWwindow* window)
 {
 	glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
@@ -174,15 +181,33 @@ void init(GLFWwindow* window)
 	program = shaderLoader.CreateProgram("shaders/shader_9_1.vert", "shaders/shader_9_1.frag");
 	programTest = shaderLoader.CreateProgram("shaders/test.vert", "shaders/test.frag");
 	programSun = shaderLoader.CreateProgram("shaders/shader_8_sun.vert", "shaders/shader_8_sun.frag");
-
+	programCubemap = shaderLoader.CreateProgram("shaders/shader_skybox.vert", "shaders/shader_skybox.frag");
-	//loadModelToContext("./models/sphere.obj", sphereContext);
-	//loadModelToContext("./models/spaceship.obj", spaceship.context);
-
-
 	
 	loadModelToContext("./models/marbleBust.obj", models::marbleBustContext);
 	loadModelToContext("./models/spaceship.obj", models::spaceshipContext);
 	loadModelToContext("./models/sphere.obj", models::sphereContext);
+	loadModelToContext("./models/cube.obj", models::cubeContext);
+
+	/*std::vector<std::string> cubeFaces = {
+	"space_rt.png",
+	"space_lf.png",
+	"space_up.png",
+	"space_dn.png",
+	"space_bk.png",
+	"space_ft.png"
+	};*/
+
+	std::vector<std::string> cubeFaces = {
+	"bkg2_right1.png",
+	"bkg2_left2.png",
+	"bkg2_top3.png",
+	"bkg2_bottom4.png",
+	"bkg2_front5.png",
+	"bkg2_back6.png"
+	};
+
+	texture::cubemapTexture = Core::LoadCubemap(cubeFaces);
+
 
 	createSuns();
 }