409 lines
15 KiB
Java
409 lines
15 KiB
Java
/*
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* Copyright (c) 2002-2004 LWJGL Project
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* * Neither the name of 'LWJGL' nor the names of
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* its contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.lwjgl.opengl;
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import java.lang.ref.WeakReference;
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import java.lang.reflect.Field;
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import java.lang.reflect.Modifier;
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import java.util.HashSet;
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import java.util.Set;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Iterator;
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import java.util.StringTokenizer;
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import java.lang.reflect.Method;
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import org.lwjgl.Sys;
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import org.lwjgl.LWJGLException;
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/**
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* $Id$
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* <p/>
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* Manages GL contexts. Before any rendering is done by a LWJGL system, a call should be made to
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* GLContext.useContext() with a context. This will ensure that GLContext has an accurate reflection
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* of the current context's capabilities and function pointers.
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*
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* @author elias_naur <elias_naur@users.sourceforge.net>
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* @version $Revision$
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*/
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public final class GLContext {
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/** The currently initialised context */
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private static WeakReference currentContext;
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/*
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* Available extensions
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*/
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public static boolean GL_ARB_imaging;
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public static boolean GL_ARB_depth_texture;
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public static boolean GL_ARB_fragment_program;
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public static boolean GL_ARB_fragment_program_shadow;
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public static boolean GL_ARB_fragment_shader;
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public static boolean GL_ARB_matrix_palette;
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public static boolean GL_ARB_multisample;
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public static boolean GL_ARB_multitexture;
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public static boolean GL_ARB_occlusion_query;
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public static boolean GL_ARB_point_parameters;
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public static boolean GL_ARB_point_sprite;
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public static boolean GL_ARB_shading_language_100;
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public static boolean GL_ARB_shader_objects;
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public static boolean GL_ARB_shadow;
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public static boolean GL_ARB_shadow_ambient;
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public static boolean GL_ARB_texture_border_clamp;
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public static boolean GL_ARB_texture_compression;
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public static boolean GL_ARB_texture_cube_map;
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public static boolean GL_ARB_texture_env_add;
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public static boolean GL_ARB_texture_env_combine;
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public static boolean GL_ARB_texture_env_crossbar;
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public static boolean GL_ARB_texture_env_dot3;
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public static boolean GL_ARB_texture_mirrored_repeat;
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public static boolean GL_ARB_texture_non_power_of_two;
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public static boolean GL_ARB_transpose_matrix;
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public static boolean GL_ARB_vertex_blend;
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public static boolean GL_ARB_vertex_buffer_object;
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public static boolean GL_ARB_vertex_program;
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public static boolean GL_ARB_vertex_shader;
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public static boolean GL_ARB_window_pos;
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public static boolean GL_EXT_abgr;
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public static boolean GL_EXT_bgra;
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public static boolean GL_EXT_blend_equation_separate;
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public static boolean GL_EXT_blend_func_separate;
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public static boolean GL_EXT_blend_subtract;
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public static boolean GL_EXT_Cg_shader;
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public static boolean GL_EXT_compiled_vertex_array;
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public static boolean GL_EXT_depth_bounds_test;
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public static boolean GL_EXT_draw_range_elements;
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public static boolean GL_EXT_fog_coord;
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public static boolean GL_EXT_multi_draw_arrays;
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public static boolean GL_EXT_packed_pixels;
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public static boolean GL_EXT_pixel_buffer_object;
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public static boolean GL_EXT_point_parameters;
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public static boolean GL_EXT_rescale_normal;
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public static boolean GL_EXT_secondary_color;
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public static boolean GL_EXT_separate_specular_color;
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public static boolean GL_EXT_shadow_funcs;
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public static boolean GL_EXT_shared_texture_palette;
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public static boolean GL_EXT_stencil_two_side;
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public static boolean GL_EXT_stencil_wrap;
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public static boolean GL_EXT_texture_compression_s3tc;
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public static boolean GL_EXT_texture_env_combine;
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public static boolean GL_EXT_texture_env_dot3;
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public static boolean GL_EXT_texture_filter_anisotropic;
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public static boolean GL_EXT_texture_lod_bias;
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public static boolean GL_EXT_texture_mirror_clamp;
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public static boolean GL_EXT_texture_rectangle;
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public static boolean GL_EXT_vertex_shader;
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public static boolean GL_EXT_vertex_weighting;
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public static boolean GL_ATI_draw_buffers;
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public static boolean GL_ATI_element_array;
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public static boolean GL_ATI_envmap_bumpmap;
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public static boolean GL_ATI_fragment_shader;
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public static boolean GL_ATI_map_object_buffer;
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public static boolean GL_ATI_pn_triangles;
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public static boolean GL_ATI_separate_stencil;
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public static boolean GL_ATI_texture_float;
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public static boolean GL_ATI_texture_mirror_once;
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public static boolean GL_ATI_vertex_array_object;
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public static boolean GL_ATI_vertex_streams;
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public static boolean GL_ATI_vertex_attrib_array_object;
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public static boolean GL_NV_blend_square;
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public static boolean GL_NV_copy_depth_to_color;
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public static boolean GL_NV_depth_clamp;
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public static boolean GL_NV_evaluators;
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public static boolean GL_NV_fence;
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public static boolean GL_NV_float_buffer;
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public static boolean GL_NV_fog_distance;
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public static boolean GL_NV_fragment_program;
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public static boolean GL_NV_fragment_program2;
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public static boolean GL_NV_fragment_program_option;
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public static boolean GL_NV_half_float;
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public static boolean GL_NV_light_max_exponent;
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public static boolean GL_NV_multisample_filter_hint;
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public static boolean GL_NV_occlusion_query;
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public static boolean GL_NV_packed_depth_stencil;
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public static boolean GL_NV_pixel_data_range;
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public static boolean GL_NV_point_sprite;
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public static boolean GL_NV_primitive_restart;
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public static boolean GL_NV_register_combiners;
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public static boolean GL_NV_register_combiners2;
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public static boolean GL_NV_texgen_reflection;
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public static boolean GL_NV_texture_compression_vtc;
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public static boolean GL_NV_texture_env_combine4;
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public static boolean GL_NV_texture_expand_normal;
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public static boolean GL_NV_texture_rectangle;
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public static boolean GL_NV_texture_shader;
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public static boolean GL_NV_texture_shader2;
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public static boolean GL_NV_texture_shader3;
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public static boolean GL_NV_vertex_array_range;
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public static boolean GL_NV_vertex_array_range2;
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public static boolean GL_NV_vertex_program;
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public static boolean GL_NV_vertex_program1_1;
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public static boolean GL_NV_vertex_program2;
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public static boolean GL_NV_vertex_program2_option;
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public static boolean GL_NV_vertex_program3;
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public static boolean OpenGL11;
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public static boolean OpenGL12;
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public static boolean OpenGL13;
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public static boolean OpenGL14;
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public static boolean OpenGL15;
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/** Map of classes that have native stubs loaded */
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private static Map exts;
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private static int gl_ref_count = 0;
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private static boolean did_auto_load = false;
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private static boolean loaded_stubs = false;
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static {
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Sys.initialize();
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}
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/**
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* Determine which extensions are available. Use this to initialize capability fields. Can only be
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* called _after_ the Display context or a Pbuffer has been created (or a context from some other GL library).
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* Using LWJGL, this method is called automatically for you when the LWJGL Window is created and there
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* is no need to call it yourself.
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*
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* @param exts A Set of OpenGL extension string names
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*/
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private static void determineAvailableExtensions(Set exts) {
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// Grab all the public static booleans out of this class
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Field[] fields = GLContext.class.getDeclaredFields();
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for ( int i = 0; i < fields.length; i++ ) {
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if ( Modifier.isStatic(fields[i].getModifiers()) && fields[i].getType().equals(boolean.class) ) {
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// reset fields
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try {
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fields[i].setBoolean(GLContext.class, exts.contains(fields[i].getName()));
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} catch (IllegalAccessException e) {
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e.printStackTrace(System.err);
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}
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}
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}
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}
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/**
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* Makes a GL context the current LWJGL context by loading GL function pointers.
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* The context must be current before a call to this method!
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* Instead it simply ensures that the current context is reflected accurately by GLContext's
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* extension caps and function pointers. Use useContext(null) when no context is active.
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* <p>If the context is the same as last time, then this is a no-op.
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* <p>If the context has not been encountered before it will be fully initialized from scratch.
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* Otherwise a cached set of caps and function pointers will be used.
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* <p>The reference to the context is held in a weak reference; therefore if no strong reference
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* exists to the GL context it will automatically be forgotten by the VM at an indeterminate point
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* in the future, freeing up a little RAM.
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* @param context The context object, which uniquely identifies a GL context. If context is null,
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* the native stubs are unloaded.
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* @throws LWJGLException if context non-null, and the gl library can't be loaded or the basic GL11 functions can't be loaded
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*/
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public static void useContext(Object context) throws LWJGLException {
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if (context == null) {
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unloadStubs();
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if (did_auto_load)
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unloadOpenGLLibrary();
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currentContext = null;
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VBOTracker.setCurrent(null);
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return;
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}
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// Is this the same as last time?
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Object current = currentContext == null ? null : currentContext.get();
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if (current == context) {
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// Yes, so we don't need to do anything. Our caps and function pointers are still valid.
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return;
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}
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// Ok, now it's the current context.
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if (gl_ref_count == 0) {
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loadOpenGLLibrary();
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did_auto_load = true;
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}
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try {
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loadStubs();
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currentContext = new WeakReference(context);
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VBOTracker.setCurrent(context);
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} catch (LWJGLException e) {
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if (did_auto_load)
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unloadOpenGLLibrary();
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throw e;
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}
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}
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private static void getExtensionClassesAndNames(Map exts, Set exts_names) {
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String version_string = GL11.glGetString(GL11.GL_VERSION);
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int version_index = version_string.indexOf("1.");
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if (version_index != -1) {
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String version = version_string.substring(version_index);
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char minor_version = version_string.charAt(2);
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switch (minor_version) {
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case '5':
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addExtensionClass(exts, exts_names, "GL15", "OpenGL15");
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// Fall through
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case '4':
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addExtensionClass(exts, exts_names, "GL14", "OpenGL14");
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// Fall through
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case '3':
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addExtensionClass(exts, exts_names, "GL13", "OpenGL13");
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// Fall through
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case '2':
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addExtensionClass(exts, exts_names, "GL12", "OpenGL12");
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// Fall through
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default:
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break;
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}
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}
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addExtensionClass(exts, exts_names, "EXTTextureCompressionS3TC", "");
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String extensions_string = GL11.glGetString(GL11.GL_EXTENSIONS);
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StringTokenizer tokenizer = new StringTokenizer(extensions_string);
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while (tokenizer.hasMoreTokens()) {
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String extension_string = tokenizer.nextToken();
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StringBuffer converted_name = new StringBuffer();
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int gl_prefix_index = extension_string.indexOf("GL_");
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if (gl_prefix_index == -1)
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continue;
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if (extension_string.equals("GL_EXT_texture_compression_s3tc")) {
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// Special workaround
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addExtensionClass(exts, exts_names, "EXTTextureCompressionS3TC", "GL_EXT_texture_compression_s3tc");
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} else if (extension_string.equals("GL_EXT_texture_lod_bias")) {
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// Special workaround
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addExtensionClass(exts, exts_names, "EXTTextureLODBias", "GL_EXT_texture_lod_bias");
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} else if (extension_string.equals("GL_NV_texture_compression_vtc")) {
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// Special workaround
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addExtensionClass(exts, exts_names, "NVTextureCompressionVTC", "GL_NV_texture_compression_vtc");
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} else {
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for (int i = gl_prefix_index + 3; i < extension_string.length(); i++) {
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char c;
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if (extension_string.charAt(i) == '_') {
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i++;
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c = Character.toUpperCase(extension_string.charAt(i));
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} else
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c = extension_string.charAt(i);
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converted_name.append(c);
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}
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addExtensionClass(exts, exts_names, converted_name.toString(), extension_string);
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}
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}
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addExtensionClass(exts, exts_names, "ARBBufferObject", null);
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addExtensionClass(exts, exts_names, "ARBProgram", null);
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addExtensionClass(exts, exts_names, "NVProgram", null);
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}
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private static void addExtensionClass(Map exts, Set exts_names, String ext_class_name, String ext_name) {
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if (ext_name != null) {
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if (exts_names.contains(ext_name)) {
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// Already added; ignore
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return;
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}
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exts_names.add(ext_name);
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}
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try {
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Class extension_class = Class.forName("org.lwjgl.opengl." + ext_class_name);
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extension_class.getDeclaredMethod("initNativeStubs", null); // check for existance of initNativeStubs method
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exts.put(extension_class, ext_name);
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} catch (ClassNotFoundException e) {
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// ignore
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} catch (NoSuchMethodException e) {
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// ignore
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}
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}
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private static void loadStubs() throws LWJGLException {
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if (loaded_stubs)
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return;
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GL11.initNativeStubs();
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exts = new HashMap();
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Set exts_names = new HashSet();
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getExtensionClassesAndNames(exts, exts_names);
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Iterator exts_it = exts.keySet().iterator();
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while (exts_it.hasNext()) {
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Class extension_class = (Class)exts_it.next();
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resetNativeStubs(extension_class);
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try {
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Method init_stubs_method = extension_class.getDeclaredMethod("initNativeStubs", null);
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init_stubs_method.invoke(null, null);
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String ext_name = (String)exts.get(extension_class);
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} catch (Exception e) {
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Sys.log("Failed to initialize extension " + extension_class);
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exts_it.remove();
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exts_names.remove(exts.get(extension_class));
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}
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}
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determineAvailableExtensions(exts_names);
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loaded_stubs = true;
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}
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private static void unloadStubs() {
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if (!loaded_stubs)
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return;
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loaded_stubs = false;
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Iterator exts_it = exts.keySet().iterator();
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while (exts_it.hasNext()) {
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Class ext_class = (Class)exts_it.next();
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resetNativeStubs(ext_class);
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}
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resetNativeStubs(org.lwjgl.opengl.GL11.class);
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}
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/**
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* If the OpenGL reference count is 0, the library is loaded. The
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* reference count is then incremented.
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*/
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public static void loadOpenGLLibrary() throws LWJGLException {
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if (gl_ref_count == 0)
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nLoadOpenGLLibrary();
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gl_ref_count++;
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}
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private static native void nLoadOpenGLLibrary() throws LWJGLException;
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/**
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* The OpenGL library reference count is decremented, and if it
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* reaches 0, the library is unloaded.
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*/
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public static void unloadOpenGLLibrary() {
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gl_ref_count--;
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if (gl_ref_count == 0)
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nUnloadOpenGLLibrary();
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}
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private static native void nUnloadOpenGLLibrary();
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/**
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* Native method to clear native stub bindings
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*/
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private static native void resetNativeStubs(Class clazz);
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}
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