Posted by elect on Feb 28, 2014; 1:50pm
URL: https://forum.jogamp.org/Old-school-texture-loading-tp4031754.html

Hi,

since TextureIO have some performances problems,  (http://stackoverflow.com/questions/1927419/loading-pngs-into-opengl-performance-issues-java-jogl-much-slower-than-c-sha) I would like to load textures from .PNG without it

If I try to load it like this

try {

            File file = new File(getClass().getResource("/ec/data/textures/" + textureName).toURI());

            bufferedImage = ImageIO.read(file);

            ImageIO.write(bufferedImage, "png", byteArrayOutputStream);

        } catch (URISyntaxException | IOException ex) {
            Logger.getLogger(EC_Mesh.class.getName()).log(Level.SEVERE, null, ex);
        }
        byte[] bs = byteArrayOutputStream.toByteArray();
         
        texture = new int[1];
       
        gl3.glGenTextures(1, texture, 0);

        gl3.glBindTexture(GL3.GL_TEXTURE_2D, texture[0]);
        {
            gl3.glTexImage2D(GL3.GL_TEXTURE_2D, 0, GL3.GL_RGBA, bufferedImage.getWidth(), bufferedImage.getHeight(),
                    0, GL3.GL_RGBA, GL3.GL_UNSIGNED_BYTE, GLBuffers.newDirectByteBuffer(bs));

I get an error

Caused by: java.lang.IndexOutOfBoundsException: Required 16777216 remaining bytes in buffer, only had 314199

My png should be a 32b RGBA 2048x2048, then 4B aligned, then 2048 * 2048 * 4 = 16777216... so why do I get 314199?