Function setupOpenGLImage

dgl/src/OpenGL3.cpp:451–510

// OpenGLImage

static void setupOpenGLImage(const OpenGLImage& image, GLuint textureId)
{
    DISTRHO_SAFE_ASSERT_RETURN(image.isValid(),);

    const ImageFormat imageFormat = image.getFormat();
    GLint intformat;

   #ifdef DGL_USE_GLES
    // GLES does not support BGR
    DISTRHO_SAFE_ASSERT_RETURN(imageFormat != kImageFormatBGR && imageFormat != kImageFormatBGRA,);
   #endif

    glBindTexture(GL_TEXTURE_2D, textureId);

    switch (imageFormat)
    {
    case kImageFormatBGR:
    case kImageFormatRGB:
        intformat = GL_RGB;
        break;
    case kImageFormatGrayscale:
       #ifdef DGL_USE_GLES2
        intformat = GL_LUMINANCE;
       #else
        intformat = GL_RED;
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_G, GL_RED);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_B, GL_RED);
       #endif
        break;
    default:
        intformat = GL_RGBA;
        break;
    }

    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

   #ifndef DGL_USE_GLES
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);

    static const float trans[] = { 0.0f, 0.0f, 0.0f, 0.0f };
    glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, trans);
   #endif

    glPixelStorei(GL_PACK_ALIGNMENT, 1);
    glPixelStorei(GL_UNPACK_ALIGNMENT, 1);

    glTexImage2D(GL_TEXTURE_2D,
                 0,
                 intformat,
                 static_cast<GLsizei>(image.getWidth()),
                 static_cast<GLsizei>(image.getHeight()),
                 0,
                 asOpenGLImageFormat(imageFormat),
                 GL_UNSIGNED_BYTE,
                 image.getRawData());