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#include "../../../include/RenderBackend/OpenGL/Texture2D.hpp"
#include "../../../include/RenderBackend/OpenGL/opengl.hpp"
#include "../../../include/Image.hpp"
#include <stack>
#include <cassert>
namespace amalgine {
struct TextureIdAllocator {
TextureIdAllocator(){
glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS, &max_texture_units);
if(max_texture_units < 1)
max_texture_units = 1;
fprintf(stderr, "max texture units: %d\n", max_texture_units);
}
u32 get_free_texture_id() {
if(!free_spots.empty()) {
u32 texture_id = free_spots.top();
free_spots.pop();
return texture_id;
}
if(texture_id_counter + 1 == max_texture_units) {
fprintf(stderr, "Error: No free spot left for textures, resetting counter\n");
texture_id_counter = 0;
}
return texture_id_counter++;
}
void free_texture_id(i32 texture_id) {
free_spots.push(texture_id);
}
std::stack<u32> free_spots;
i32 texture_id_counter = 0;
i32 max_texture_units = 0;
};
static TextureIdAllocator *texture_id_allocator = nullptr;
Texture2D::Texture2D(Image *image)
{
assert(image);
if(!texture_id_allocator)
texture_id_allocator = new TextureIdAllocator();
texture_id = texture_id_allocator->get_free_texture_id();
glGenTextures(1, &texture_ref);
glActiveTexture(GL_TEXTURE0 + texture_id);
glBindTexture(GL_TEXTURE_2D, texture_ref);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, image->getWidth(), image->getHeight(), 0, GL_RGB, GL_UNSIGNED_BYTE, image->getData());
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glGenerateMipmap(GL_TEXTURE_2D);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR_MIPMAP_LINEAR);
}
Texture2D::~Texture2D()
{
texture_id_allocator->free_texture_id(texture_id);
glDeleteTextures(1, &texture_ref);
}
}
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