diff options
Diffstat (limited to 'xs/src/slic3r/GUI/GLTexture.cpp')
| -rw-r--r-- | xs/src/slic3r/GUI/GLTexture.cpp | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/xs/src/slic3r/GUI/GLTexture.cpp b/xs/src/slic3r/GUI/GLTexture.cpp new file mode 100644 index 000000000..924920bd8 --- /dev/null +++ b/xs/src/slic3r/GUI/GLTexture.cpp @@ -0,0 +1,190 @@ +#include "GLTexture.hpp" + +#include <GL/glew.h> + +#include <wx/image.h> + +#include <boost/filesystem.hpp> + +#include <vector> +#include <algorithm> + +namespace Slic3r { +namespace GUI { + +GLTexture::GLTexture() + : m_id(0) + , m_width(0) + , m_height(0) + , m_source("") +{ +} + +GLTexture::~GLTexture() +{ + reset(); +} + +bool GLTexture::load_from_file(const std::string& filename, bool generate_mipmaps) +{ + reset(); + + if (!boost::filesystem::exists(filename)) + return false; + + // Load a PNG with an alpha channel. + wxImage image; + if (!image.LoadFile(filename, wxBITMAP_TYPE_PNG)) + { + reset(); + return false; + } + + m_width = image.GetWidth(); + m_height = image.GetHeight(); + int n_pixels = m_width * m_height; + + if (n_pixels <= 0) + { + reset(); + return false; + } + + // Get RGB & alpha raw data from wxImage, pack them into an array. + unsigned char* img_rgb = image.GetData(); + if (img_rgb == nullptr) + { + reset(); + return false; + } + + unsigned char* img_alpha = image.GetAlpha(); + + std::vector<unsigned char> data(n_pixels * 4, 0); + for (int i = 0; i < n_pixels; ++i) + { + int data_id = i * 4; + int img_id = i * 3; + data[data_id + 0] = img_rgb[img_id + 0]; + data[data_id + 1] = img_rgb[img_id + 1]; + data[data_id + 2] = img_rgb[img_id + 2]; + data[data_id + 3] = (img_alpha != nullptr) ? img_alpha[i] : 255; + } + + // sends data to gpu + ::glGenTextures(1, &m_id); + ::glBindTexture(GL_TEXTURE_2D, m_id); + ::glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, (GLsizei)m_width, (GLsizei)m_height, 0, GL_RGBA, GL_UNSIGNED_BYTE, (const void*)data.data()); + if (generate_mipmaps) + { + // we manually generate mipmaps because glGenerateMipmap() function is not reliable on all graphics cards + _generate_mipmaps(image); + ::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); + } + else + { + ::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + ::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1); + } + ::glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + + ::glBindTexture(GL_TEXTURE_2D, 0); + + m_source = filename; + return true; +} + +void GLTexture::reset() +{ + if (m_id != 0) + ::glDeleteTextures(1, &m_id); + + m_id = 0; + m_width = 0; + m_height = 0; + m_source = ""; +} + +unsigned int GLTexture::get_id() const +{ + return m_id; +} + +int GLTexture::get_width() const +{ + return m_width; +} + +int GLTexture::get_height() const +{ + return m_height; +} + +const std::string& GLTexture::get_source() const +{ + return m_source; +} + +void GLTexture::render_texture(unsigned int tex_id, float left, float right, float bottom, float top) +{ + ::glColor4f(1.0f, 1.0f, 1.0f, 1.0f); + + ::glDisable(GL_LIGHTING); + ::glEnable(GL_BLEND); + ::glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); + ::glEnable(GL_TEXTURE_2D); + + ::glBindTexture(GL_TEXTURE_2D, (GLuint)tex_id); + + ::glBegin(GL_QUADS); + ::glTexCoord2d(0.0f, 1.0f); ::glVertex3f(left, bottom, 0.0f); + ::glTexCoord2d(1.0f, 1.0f); ::glVertex3f(right, bottom, 0.0f); + ::glTexCoord2d(1.0f, 0.0f); ::glVertex3f(right, top, 0.0f); + ::glTexCoord2d(0.0f, 0.0f); ::glVertex3f(left, top, 0.0f); + ::glEnd(); + + ::glBindTexture(GL_TEXTURE_2D, 0); + + ::glDisable(GL_TEXTURE_2D); + ::glDisable(GL_BLEND); + ::glEnable(GL_LIGHTING); +} + +void GLTexture::_generate_mipmaps(wxImage& image) +{ + int w = image.GetWidth(); + int h = image.GetHeight(); + GLint level = 0; + std::vector<unsigned char> data(w * h * 4, 0); + + while ((w > 1) && (h > 1)) + { + ++level; + + w = std::max(w / 2, 1); + h = std::max(h / 2, 1); + + int n_pixels = w * h; + + image = image.ResampleBicubic(w, h); + + unsigned char* img_rgb = image.GetData(); + unsigned char* img_alpha = image.GetAlpha(); + + data.resize(n_pixels * 4); + for (int i = 0; i < n_pixels; ++i) + { + int data_id = i * 4; + int img_id = i * 3; + data[data_id + 0] = img_rgb[img_id + 0]; + data[data_id + 1] = img_rgb[img_id + 1]; + data[data_id + 2] = img_rgb[img_id + 2]; + data[data_id + 3] = (img_alpha != nullptr) ? img_alpha[i] : 255; + } + + ::glTexImage2D(GL_TEXTURE_2D, level, GL_RGBA8, (GLsizei)w, (GLsizei)h, 0, GL_RGBA, GL_UNSIGNED_BYTE, (const void*)data.data()); + } +} + +} // namespace GUI +} // namespace Slic3r |