81 lines
2.1 KiB
C++
81 lines
2.1 KiB
C++
#include <asset_parser/assets/texture.hpp>
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#include <lt_debug/assertions.hpp>
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#include <renderer/gl/texture.hpp>
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namespace lt {
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glTexture::glTexture(const Ref<Assets::TextureAsset> &asset)
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{
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const auto metadata = asset->get_metadata();
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const auto blob_metadata = asset->get_blob_metadata(Assets::BlobMetadata::Tag::color);
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glCreateTextures(GL_TEXTURE_2D, 1, &m_texture_id);
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glTextureParameteri(m_texture_id, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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glTextureParameteri(m_texture_id, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTextureParameteri(m_texture_id, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTextureParameteri(m_texture_id, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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auto blob = std::vector<std::byte>(blob_metadata.uncompressed_size);
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asset->unpack_blob(blob_metadata.tag, blob.data(), blob.size());
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bind();
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glTexImage2D(
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GL_TEXTURE_2D,
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0,
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map_num_components_to_internal_format(metadata.num_components),
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static_cast<int>(metadata.pixel_size[0]),
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static_cast<int>(metadata.pixel_size[1]),
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0,
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map_num_components_to_format(metadata.num_components),
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GL_UNSIGNED_BYTE,
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std::bit_cast<unsigned char *>(blob.data())
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);
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glGenerateMipmap(GL_TEXTURE_2D);
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}
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glTexture::~glTexture()
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{
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glDeleteTextures(1, &m_texture_id);
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}
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void glTexture::bind(unsigned int slot /* = 0u */)
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{
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glActiveTexture(GL_TEXTURE0 + slot);
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glBindTexture(GL_TEXTURE_2D, m_texture_id);
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}
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auto glTexture::get_texture() -> void *
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{
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return (void *)(intptr_t)m_texture_id;
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}
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[[nodiscard]] auto glTexture::map_num_components_to_format(uint32_t num_components) const -> int
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{
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switch (num_components)
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{
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case 4u: return GL_RGBA;
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case 3u: return GL_RGB;
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case 2u: return GL_RG;
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case 1u: return GL_RED;
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default: ensure(false, "Invalid number of components: {}", num_components);
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}
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return {};
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}
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[[nodiscard]] auto glTexture::map_num_components_to_internal_format(uint32_t num_components) const
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-> int
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{
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switch (num_components)
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{
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case 4u: return GL_RGBA8;
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case 3u: return GL_RGB8;
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case 2u: return GL_RG8;
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case 1u: return GL_R8;
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default: ensure(false, "Invalid number of components: {}", num_components);
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}
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return {};
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}
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} // namespace lt
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