mirror of
https://github.com/UberGames/GtkRadiant.git
synced 2024-11-22 20:02:42 +00:00
391 lines
12 KiB
C++
391 lines
12 KiB
C++
/*
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Copyright (c) 2001, Loki software, inc.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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Neither the name of Loki software nor the names of its contributors may be used
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to endorse or promote products derived from this software without specific prior
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written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
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DIRECT,INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING 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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// OpenGL widget based on GtkGLExt
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#include "stdafx.h"
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#include <gtk/gtkgl.h>
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#include <pango/pangoft2.h>
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#include "glwidget.h"
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#include "qgl.h"
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typedef int* attribs_t;
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typedef const attribs_t* configs_iterator;
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int config_rgba32[] = {
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GDK_GL_RGBA,
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GDK_GL_DOUBLEBUFFER,
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GDK_GL_RED_SIZE, 8,
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GDK_GL_BLUE_SIZE, 8,
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GDK_GL_GREEN_SIZE, 8,
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GDK_GL_ALPHA_SIZE, 8,
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GDK_GL_ATTRIB_LIST_NONE,
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};
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int config_rgba[] = {
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GDK_GL_RGBA,
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GDK_GL_DOUBLEBUFFER,
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GDK_GL_RED_SIZE, 1,
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GDK_GL_BLUE_SIZE, 1,
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GDK_GL_GREEN_SIZE, 1,
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GDK_GL_ALPHA_SIZE, 1,
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GDK_GL_ATTRIB_LIST_NONE,
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};
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const attribs_t configs[] = {
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config_rgba32,
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config_rgba,
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};
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GdkGLConfig* glconfig_new(){
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GdkGLConfig* glconfig = NULL;
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for ( configs_iterator i = configs, end = configs + 2; i != end && glconfig == NULL; ++i )
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{
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glconfig = gdk_gl_config_new( *i );
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}
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if ( glconfig == NULL ) {
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return gdk_gl_config_new_by_mode( (GdkGLConfigMode)( GDK_GL_MODE_RGBA | GDK_GL_MODE_DOUBLE ) );
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}
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return glconfig;
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}
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int config_rgba32_depth32[] = {
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GDK_GL_RGBA,
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GDK_GL_DOUBLEBUFFER,
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GDK_GL_RED_SIZE, 8,
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GDK_GL_BLUE_SIZE, 8,
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GDK_GL_GREEN_SIZE, 8,
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GDK_GL_ALPHA_SIZE, 8,
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GDK_GL_DEPTH_SIZE, 32,
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GDK_GL_ATTRIB_LIST_NONE,
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};
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int config_rgba32_depth24[] = {
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GDK_GL_RGBA,
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GDK_GL_DOUBLEBUFFER,
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GDK_GL_RED_SIZE, 8,
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GDK_GL_BLUE_SIZE, 8,
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GDK_GL_GREEN_SIZE, 8,
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GDK_GL_ALPHA_SIZE, 8,
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GDK_GL_DEPTH_SIZE, 24,
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GDK_GL_ATTRIB_LIST_NONE,
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};
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int config_rgba32_depth16[] = {
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GDK_GL_RGBA,
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GDK_GL_DOUBLEBUFFER,
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GDK_GL_RED_SIZE, 8,
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GDK_GL_BLUE_SIZE, 8,
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GDK_GL_GREEN_SIZE, 8,
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GDK_GL_ALPHA_SIZE, 8,
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GDK_GL_DEPTH_SIZE, 16,
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GDK_GL_ATTRIB_LIST_NONE,
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};
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int config_rgba32_depth[] = {
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GDK_GL_RGBA,
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GDK_GL_DOUBLEBUFFER,
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GDK_GL_RED_SIZE, 8,
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GDK_GL_BLUE_SIZE, 8,
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GDK_GL_GREEN_SIZE, 8,
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GDK_GL_ALPHA_SIZE, 8,
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GDK_GL_DEPTH_SIZE, 1,
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GDK_GL_ATTRIB_LIST_NONE,
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};
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int config_rgba_depth16[] = {
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GDK_GL_RGBA,
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GDK_GL_DOUBLEBUFFER,
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GDK_GL_RED_SIZE, 1,
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GDK_GL_BLUE_SIZE, 1,
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GDK_GL_GREEN_SIZE, 1,
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GDK_GL_ALPHA_SIZE, 1,
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GDK_GL_DEPTH_SIZE, 16,
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GDK_GL_ATTRIB_LIST_NONE,
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};
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int config_rgba_depth[] = {
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GDK_GL_RGBA,
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GDK_GL_DOUBLEBUFFER,
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GDK_GL_RED_SIZE, 1,
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GDK_GL_BLUE_SIZE, 1,
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GDK_GL_GREEN_SIZE, 1,
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GDK_GL_ALPHA_SIZE, 1,
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GDK_GL_DEPTH_SIZE, 1,
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GDK_GL_ATTRIB_LIST_NONE,
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};
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const attribs_t configs_with_depth[] =
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{
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config_rgba32_depth32,
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config_rgba32_depth24,
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config_rgba32_depth16,
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config_rgba32_depth,
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config_rgba_depth16,
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config_rgba_depth,
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};
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GdkGLConfig* glconfig_new_with_depth(){
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GdkGLConfig* glconfig = NULL;
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for ( configs_iterator i = configs_with_depth, end = configs_with_depth + 6; i != end && glconfig == NULL; ++i )
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{
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glconfig = gdk_gl_config_new( *i );
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}
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if ( glconfig == NULL ) {
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return gdk_gl_config_new_by_mode( (GdkGLConfigMode)( GDK_GL_MODE_RGBA | GDK_GL_MODE_DOUBLE | GDK_GL_MODE_DEPTH ) );
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}
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return glconfig;
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}
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GtkWidget* WINAPI gtk_glwidget_new( gboolean zbuffer, GtkWidget* share ){
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GtkWidget* drawing_area = gtk_drawing_area_new();
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GdkGLConfig* glconfig = ( zbuffer ) ? glconfig_new_with_depth() : glconfig_new();
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GdkGLContext* shared_context = ( share ) ? gtk_widget_get_gl_context( share ) : NULL;
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gtk_widget_set_gl_capability( drawing_area, glconfig, shared_context, TRUE, GDK_GL_RGBA_TYPE );
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return drawing_area;
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}
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void WINAPI gtk_glwidget_destroy_context( GtkWidget *widget ){
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}
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void WINAPI gtk_glwidget_create_context( GtkWidget *widget ){
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}
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void WINAPI gtk_glwidget_swap_buffers( GtkWidget *widget ){
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GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable( widget );
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gdk_gl_drawable_swap_buffers( gldrawable );
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}
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gboolean WINAPI gtk_glwidget_make_current( GtkWidget *widget ){
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GdkGLContext *glcontext = gtk_widget_get_gl_context( widget );
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GdkGLDrawable *gldrawable = gtk_widget_get_gl_drawable( widget );
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return gdk_gl_drawable_gl_begin( gldrawable, glcontext );
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}
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// Think about rewriting this font stuff to use OpenGL display lists and glBitmap().
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// Bit maps together with display lists may offer a performance increase, but
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// they would not allow antialiased fonts.
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#ifdef _WIN32
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static const char font_string[] = "Courier bold";
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static const int font_height = 9;
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#else
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static const char font_string[] = "Monospace";
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static const int font_height = 10;
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#endif
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static int font_ascent = -1;
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static int font_descent = -1;
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static int y_offset_bitmap_render_pango_units = -1;
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static PangoContext *ft2_context = NULL;
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static int _debug_font_created = 0;
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// Units are pixels. Returns a positive value [most likely].
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int gtk_glwidget_font_ascent(){
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if ( !_debug_font_created ) {
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Error( "Programming error: gtk_glwidget_font_ascent() called but font does not exist; "
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"you should have called gtk_glwidget_create_font() first" );
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}
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return font_ascent;
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}
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// Units are pixels. Returns a positive value [most likely].
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int gtk_glwidget_font_descent(){
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if ( !_debug_font_created ) {
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Error( "Programming error: gtk_glwidget_font_descent() called but font does not exist; "
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"you should have called gtk_glwidget_create_font() first" );
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}
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return font_descent;
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}
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void gtk_glwidget_create_font(){
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PangoFontDescription *font_desc;
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PangoLayout *layout;
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PangoRectangle log_rect;
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int font_ascent_pango_units;
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int font_descent_pango_units;
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if ( _debug_font_created ) {
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Error( "Programming error: gtk_glwidget_create_font() was already called; "
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"you must call gtk_glwidget_destroy_font() before creating font again" );
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}
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_debug_font_created = 1;
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// This call is deprecated so we'll have to fix it sometime.
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ft2_context = pango_ft2_get_context( 72, 72 );
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font_desc = pango_font_description_from_string( font_string );
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pango_font_description_set_size( font_desc, font_height * PANGO_SCALE );
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pango_context_set_font_description( ft2_context, font_desc );
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pango_font_description_free( font_desc );
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layout = pango_layout_new( ft2_context );
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// I don't believe that's standard preprocessor syntax?
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#if !PANGO_VERSION_CHECK( 1,22,0 )
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PangoLayoutIter *iter;
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iter = pango_layout_get_iter( layout );
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font_ascent_pango_units = pango_layout_iter_get_baseline( iter );
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pango_layout_iter_free( iter );
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#else
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font_ascent_pango_units = pango_layout_get_baseline( layout );
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#endif
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pango_layout_get_extents( layout, NULL, &log_rect );
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g_object_unref( G_OBJECT( layout ) );
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font_descent_pango_units = log_rect.height - font_ascent_pango_units;
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font_ascent = PANGO_PIXELS_CEIL( font_ascent_pango_units );
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font_descent = PANGO_PIXELS_CEIL( font_descent_pango_units );
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y_offset_bitmap_render_pango_units = ( font_ascent * PANGO_SCALE ) - font_ascent_pango_units;
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}
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void gtk_glwidget_destroy_font(){
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if ( !_debug_font_created ) {
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Error( "Programming error: gtk_glwidget_destroy_font() called when font "
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"does not exist" );
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}
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font_ascent = -1;
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font_descent = -1;
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y_offset_bitmap_render_pango_units = -1;
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g_object_unref( G_OBJECT( ft2_context ) );
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_debug_font_created = 0;
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}
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// Renders the input text at the current location with the current color.
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// The X position of the current location is used to place the left edge of the text image,
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// where the text image bounds are defined as the logical extents of the line of text.
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// The Y position of the current location is used to place the bottom of the text image.
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// You should offset the Y position by the amount returned by gtk_glwidget_font_descent()
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// if you want to place the baseline of the text image at the current Y position.
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// Note: A problem with this function is that if the lower left corner of the text falls
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// just a hair outside of the viewport (meaning the current raster position is invalid),
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// then no text will be rendered. The solution to this is a very hacky one. You can search
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// Google for "glDrawPixels clipping".
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void gtk_glwidget_print_string( const char *s ){
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// The idea for this code initially came from the font-pangoft2.c example that comes with GtkGLExt.
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PangoLayout *layout;
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PangoRectangle log_rect;
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FT_Bitmap bitmap;
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unsigned char *begin_bitmap_buffer;
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GLfloat color[4];
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GLint previous_unpack_alignment;
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GLboolean previous_blend_enabled;
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GLint previous_blend_func_src;
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GLint previous_blend_func_dst;
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GLfloat previous_red_bias;
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GLfloat previous_green_bias;
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GLfloat previous_blue_bias;
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GLfloat previous_alpha_scale;
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if ( !_debug_font_created ) {
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Error( "Programming error: gtk_glwidget_print_string() called but font does not exist; "
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"you should have called gtk_glwidget_create_font() first" );
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}
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layout = pango_layout_new( ft2_context );
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pango_layout_set_width( layout, -1 ); // -1 no wrapping. All text on one line.
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pango_layout_set_text( layout, s, -1 ); // -1 null-terminated string.
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pango_layout_get_extents( layout, NULL, &log_rect );
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if ( log_rect.width > 0 && log_rect.height > 0 ) {
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bitmap.rows = font_ascent + font_descent;
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bitmap.width = PANGO_PIXELS_CEIL( log_rect.width );
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bitmap.pitch = -bitmap.width; // Rendering it "upside down" for OpenGL.
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begin_bitmap_buffer = (unsigned char *) g_malloc( bitmap.rows * bitmap.width );
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memset( begin_bitmap_buffer, 0, bitmap.rows * bitmap.width );
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bitmap.buffer = begin_bitmap_buffer + ( bitmap.rows - 1 ) * bitmap.width; // See pitch above.
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bitmap.num_grays = 0xff;
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bitmap.pixel_mode = FT_PIXEL_MODE_GRAY;
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pango_ft2_render_layout_subpixel( &bitmap, layout, -log_rect.x,
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y_offset_bitmap_render_pango_units );
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qglGetFloatv( GL_CURRENT_COLOR, color );
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// Save state. I didn't see any OpenGL push/pop operations for these.
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// Question: Is saving/restoring this state necessary? Being safe.
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qglGetIntegerv( GL_UNPACK_ALIGNMENT, &previous_unpack_alignment );
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previous_blend_enabled = qglIsEnabled( GL_BLEND );
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qglGetIntegerv( GL_BLEND_SRC, &previous_blend_func_src );
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qglGetIntegerv( GL_BLEND_DST, &previous_blend_func_dst );
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qglGetFloatv( GL_RED_BIAS, &previous_red_bias );
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qglGetFloatv( GL_GREEN_BIAS, &previous_green_bias );
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qglGetFloatv( GL_BLUE_BIAS, &previous_blue_bias );
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qglGetFloatv( GL_ALPHA_SCALE, &previous_alpha_scale );
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qglPixelStorei( GL_UNPACK_ALIGNMENT, 1 );
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qglEnable( GL_BLEND );
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qglBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
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qglPixelTransferf( GL_RED_BIAS, color[0] );
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qglPixelTransferf( GL_GREEN_BIAS, color[1] );
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qglPixelTransferf( GL_BLUE_BIAS, color[2] );
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qglPixelTransferf( GL_ALPHA_SCALE, color[3] );
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qglDrawPixels( bitmap.width, bitmap.rows,
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GL_ALPHA, GL_UNSIGNED_BYTE, begin_bitmap_buffer );
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g_free( begin_bitmap_buffer );
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// Restore state in reverse order of how we set it.
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qglPixelTransferf( GL_ALPHA_SCALE, previous_alpha_scale );
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qglPixelTransferf( GL_BLUE_BIAS, previous_blue_bias );
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qglPixelTransferf( GL_GREEN_BIAS, previous_green_bias );
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qglPixelTransferf( GL_RED_BIAS, previous_red_bias );
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qglBlendFunc( previous_blend_func_src, previous_blend_func_dst );
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if ( !previous_blend_enabled ) {
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qglDisable( GL_BLEND );
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}
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qglPixelStorei( GL_UNPACK_ALIGNMENT, previous_unpack_alignment );
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}
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g_object_unref( G_OBJECT( layout ) );
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}
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void gtk_glwidget_print_char( char s ){
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char str[2];
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str[0] = s;
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str[1] = '\0';
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gtk_glwidget_print_string( str );
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}
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