Example usage for org.lwjgl.opengl ARBFramebufferObject glGenerateMipmap

Introduction

In this page you can find the example usage for org.lwjgl.opengl ARBFramebufferObject glGenerateMipmap.

Prototype

public static void glGenerateMipmap(@NativeType("GLenum") int target) 

Source Link

Document

Generate mipmaps for a specified texture target.

Usage

From source file:mwisbest.openbase.opengl.TextureLoader.java

License:Open Source License

private TextureImplementation getTexture(InputStream in, String resourceName, int target, int minFilter,
        int magFilter, boolean flipped, int[] transparent) throws IOException {
    // create the texture ID for this texture
    ByteBuffer textureBuffer;//from ww  w .  j a v  a  2  s  .co m

    LoadableImageData imageData = ImageDataFactory.getImageDataFor(resourceName);
    textureBuffer = imageData.loadImage(new BufferedInputStream(in), flipped, transparent);

    int textureID = createTextureID();
    TextureImplementation texture = new TextureImplementation(resourceName, target, textureID);
    // bind this texture
    GL11.glEnable(target);
    GL11.glBindTexture(target, textureID);

    int width;
    int height;
    int texWidth;
    int texHeight;

    ImageData.Format format;

    width = imageData.getWidth();
    height = imageData.getHeight();
    format = imageData.getFormat();

    texture.setTextureWidth(imageData.getTexWidth());
    texture.setTextureHeight(imageData.getTexHeight());

    texWidth = texture.getTextureWidth();
    texHeight = texture.getTextureHeight();

    IntBuffer temp = BufferUtils.createIntBuffer(16);
    GL11.glGetInteger(GL11.GL_MAX_TEXTURE_SIZE, temp);
    int max = temp.get(0);
    if (texWidth > max || texHeight > max)
        throw new IOException("Attempt to allocate a texture to big for the current hardware");

    int srcPixelFormat = format.getOGLType();

    texture.setWidth(width);
    texture.setHeight(height);
    texture.setImageFormat(format);

    GL11.glTexParameteri(target, GL11.GL_TEXTURE_MIN_FILTER, minFilter);
    GL11.glTexParameteri(target, GL11.GL_TEXTURE_MAG_FILTER, magFilter);

    ContextCapabilities capabilities = GLContext.getCapabilities();

    if (capabilities.OpenGL30 || capabilities.GL_EXT_framebuffer_object
            || capabilities.GL_ARB_framebuffer_object || capabilities.OpenGL14) {
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_NEAREST_MIPMAP_LINEAR);
        GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL12.GL_TEXTURE_MAX_LOD, GL11.GL_POLYGON_BIT);
        if (capabilities.OpenGL30)
            GL30.glGenerateMipmap(GL11.GL_TEXTURE_2D);
        else if (capabilities.GL_EXT_framebuffer_object)
            EXTFramebufferObject.glGenerateMipmapEXT(GL11.GL_TEXTURE_2D);
        else if (capabilities.GL_ARB_framebuffer_object)
            ARBFramebufferObject.glGenerateMipmap(GL11.GL_TEXTURE_2D);
        else if (capabilities.OpenGL14)
            GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL14.GL_GENERATE_MIPMAP, GL11.GL_TRUE);
    }

    // produce a texture from the byte buffer
    GL11.glTexImage2D(target, 0, this.dstPixelFormat, get2Fold(width), get2Fold(height), 0, srcPixelFormat,
            GL11.GL_UNSIGNED_BYTE, textureBuffer);
    return texture;
}

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