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#include "opengl_texture.h"
namespace Donut
{
OpenGLTexture2D::OpenGLTexture2D(uint32_t width, uint32_t height)
: m_width(width), m_height(height)
{
m_internal_format = GL_RGBA8;
m_data_format = GL_RGBA;
glCreateTextures(GL_TEXTURE_2D, 1, &m_renderer_id);
glTextureStorage2D(m_renderer_id, 1, m_internal_format, m_width, m_height);
glTextureParameteri(m_renderer_id, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTextureParameteri(m_renderer_id, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTextureParameteri(m_renderer_id, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTextureParameteri(m_renderer_id, GL_TEXTURE_WRAP_T, GL_REPEAT);
}
OpenGLTexture2D::OpenGLTexture2D(const std::string& path)
: m_path(path)
{
m_width = 1;
m_height = 1;
m_internal_format = GL_RGBA8;
m_data_format = GL_RGBA;
glCreateTextures(GL_TEXTURE_2D, 1, &m_renderer_id);
glTextureStorage2D(m_renderer_id, 1, m_internal_format, m_width, m_height);
glTextureParameteri(m_renderer_id, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTextureParameteri(m_renderer_id, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTextureParameteri(m_renderer_id, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTextureParameteri(m_renderer_id, GL_TEXTURE_WRAP_T, GL_REPEAT);
uint32_t white_pixel = 0xFFFFFFFF;
glTextureSubImage2D(m_renderer_id, 0, 0, 0, m_width, m_height, m_data_format, GL_UNSIGNED_BYTE, &white_pixel);
DONUT_INFO("Created default texture (stb_image not available for loading: ", path, ")");
}
OpenGLTexture2D::~OpenGLTexture2D()
{
glDeleteTextures(1, &m_renderer_id);
}
void OpenGLTexture2D::set_data(void* data, uint32_t size)
{
uint32_t bpp = m_data_format == GL_RGBA ? 4 : 3;
if (size != m_width * m_height * bpp)
{
DONUT_ERROR("Data must be entire texture!");
return;
}
glTextureSubImage2D(m_renderer_id, 0, 0, 0, m_width, m_height, m_data_format, GL_UNSIGNED_BYTE, data);
}
void OpenGLTexture2D::bind(uint32_t slot) const
{
glBindTextureUnit(slot, m_renderer_id);
}
void OpenGLTexture2D::bind_as_image(uint32_t slot, bool read_only) const
{
GLenum access = read_only ? GL_READ_ONLY : GL_WRITE_ONLY;
glBindImageTexture(slot, m_renderer_id, 0, GL_FALSE, 0, access, m_internal_format);
}
};
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