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#include "Skybox.hpp"
#include "Shader.hpp"
#include <stb_image.h>
#include <algorithm>
#include <filesystem>
#include <iostream>
namespace Fs = std::filesystem;
namespace renderer {
Skybox::Skybox () : mTexID( 0 ), mVAO( 0 ), mVBO( 0 ), mInitialized( false ) {}
Skybox::~Skybox () {
if( mVBO )
glDeleteBuffers( 1, &mVBO );
if( mVAO )
glDeleteVertexArrays( 1, &mVAO );
if( mTexID )
glDeleteTextures( 1, &mTexID );
}
static std::string toLower ( const std::string& s ) {
std::string out = s;
std::transform( out.begin(), out.end(), out.begin(), [] ( unsigned char c ) { return std::tolower( c ); } );
return out;
}
bool Skybox::loadFromDirectory ( const std::string& dirPath ) {
std::vector<std::string> faceTokens = { "right", "left", "top", "bottom", "front", "back" };
std::vector<std::string> faces( 6 );
if( !Fs::exists( dirPath ) || !Fs::is_directory( dirPath ) ) {
std::cerr << "Skybox directory does not exist: " << dirPath << std::endl;
return false;
}
for( auto& entry : Fs::directory_iterator( dirPath ) ) {
if( !entry.is_regular_file() )
continue;
auto name = entry.path().filename().string();
std::string lname = toLower( name );
for( size_t i = 0; i < faceTokens.size(); ++i ) {
if( lname.find( faceTokens[i] ) != std::string::npos ) {
faces[i] = entry.path().string();
}
}
}
for( size_t i = 0; i < faces.size(); ++i ) {
if( faces[i].empty() ) {
std::cerr << "Missing skybox face for token: " << faceTokens[i] << std::endl;
return false;
}
}
return loadFaces( faces );
}
bool Skybox::loadFaces ( const std::vector<std::string>& faces ) {
glGenTextures( 1, &mTexID );
glBindTexture( GL_TEXTURE_CUBE_MAP, mTexID );
stbi_set_flip_vertically_on_load( false );
for( unsigned i = 0; i < faces.size(); ++i ) {
int w, h, ch;
unsigned char* data = stbi_load( faces[i].c_str(), &w, &h, &ch, 0 );
if( !data ) {
std::cerr << "Failed to load skybox face: " << faces[i] << std::endl;
glBindTexture( GL_TEXTURE_CUBE_MAP, 0 );
return false;
}
GLenum format = ( ch == 4 ) ? GL_RGBA : GL_RGB;
glTexImage2D( GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, format, w, h, 0, format, GL_UNSIGNED_BYTE, data );
stbi_image_free( data );
}
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 );
glBindTexture( GL_TEXTURE_CUBE_MAP, 0 );
initMesh();
mInitialized = true;
return true;
}
void Skybox::initMesh () {
float skyboxVertices[] = { -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, &mVAO );
glGenBuffers( 1, &mVBO );
glBindVertexArray( mVAO );
glBindBuffer( GL_ARRAY_BUFFER, mVBO );
glBufferData( GL_ARRAY_BUFFER, sizeof( skyboxVertices ), &skyboxVertices, GL_STATIC_DRAW );
glEnableVertexAttribArray( 0 );
glVertexAttribPointer( 0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof( float ), (void*)0 );
glBindVertexArray( 0 );
}
void Skybox::draw ( const glm::mat4& view, const glm::mat4& proj ) {
if( !mInitialized )
return;
static Shader s;
static bool shaderLoaded = false;
if( !shaderLoaded ) {
s.fromFiles( "apps/openmb/resources/shaders/skybox.vert", "apps/openmb/resources/shaders/skybox.frag" );
shaderLoaded = true;
}
glDepthFunc( GL_LEQUAL );
glDepthMask( GL_FALSE );
s.use();
glm::mat4 viewNoTrans = glm::mat4( glm::mat3( view ) );
s.setMat4( "view", viewNoTrans );
s.setMat4( "proj", proj );
glActiveTexture( GL_TEXTURE0 );
glBindTexture( GL_TEXTURE_CUBE_MAP, mTexID );
s.setInt( "skybox", 0 );
glBindVertexArray( mVAO );
glDrawArrays( GL_TRIANGLES, 0, 36 );
glBindVertexArray( 0 );
glDepthMask( GL_TRUE );
glDepthFunc( GL_LESS );
}
} // namespace renderer
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