ShaderTextureManager.cpp

#include "Shading/ShaderTextureManager.h"
#include "Shading/ShaderNodes/ShaderTextureNode.h"
 
#include "glad/glad.h"
 
 
ShaderTextureManager::ShaderTextureManager()
{
    textureArray = 0;
    glGenTextures(1, &textureArray);
    glBindTexture(GL_TEXTURE_2D_ARRAY, textureArray);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_R, GL_REPEAT);
    glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAX_LEVEL, 0);
    glBindTexture(GL_TEXTURE_2D_ARRAY, 0);
}
 
ShaderTextureManager::~ShaderTextureManager()
{
}
 
void ShaderTextureManager::Register(ShaderTextureNode *node)
{
    textureNodes.push_back(node);
    node->zCoord = textureNodes.size() - 1;
}
 
void ShaderTextureManager::Unregister(ShaderTextureNode *node)
{
    for(int i = 0; i < textureNodes.size(); i++)
    {
        if(textureNodes[i]->id == node->id)
        {
            textureNodes.erase(textureNodes.begin() + i);
            break;
        }
    }
 
    for(int i = 0; i < textureNodes.size(); i++)
    {
        textureNodes[i]->zCoord = i;
    }
}
 
void ShaderTextureManager::UpdateShaders()
{
    glBindTexture(GL_TEXTURE_2D_ARRAY, textureArray);
    glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_RGB8, resolution, resolution, textureNodes.size(), 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
 
    for(int i = 0; i < textureNodes.size(); i++)
    {
        textureNodes[i]->texture->Resize(resolution, resolution);
        glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, i, resolution, resolution, 1, GL_RGB, GL_UNSIGNED_BYTE, textureNodes[i]->texture->GetData());
    }
 
    glBindTexture(GL_TEXTURE_2D_ARRAY, 0);
}
 
void ShaderTextureManager::UploadToGPU(int id)
{
    glBindTexture(GL_TEXTURE_2D_ARRAY, textureArray);
    textureNodes[id]->texture->Resize(resolution, resolution);
    glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, id, resolution, resolution, 1, GL_RGB, GL_UNSIGNED_BYTE, textureNodes[id]->texture->GetData());
    glBindTexture(GL_TEXTURE_2D_ARRAY, 0);
}
 
void ShaderTextureManager::Bind(uint32_t slot)
{
    glActiveTexture(GL_TEXTURE0 + slot);
    glBindTexture(GL_TEXTURE_2D_ARRAY, textureArray);
}