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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* Contributor(s): 2007 Blender Foundation (refactor)
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/windowmanager/intern/wm_subwindow.c
* \ingroup wm
*
* OpenGL utilities for setting up 2D viewport for window and regions.
*/
#include "BLI_math.h"
#include "BLI_rect.h"
#include "DNA_screen_types.h"
#include "DNA_windowmanager_types.h"
#include "BIF_gl.h"
#include "GPU_matrix.h"
#include "WM_api.h"
void wmViewport(const rcti *winrct)
{
int width = BLI_rcti_size_x(winrct) + 1;
int height = BLI_rcti_size_y(winrct) + 1;
glViewport(winrct->xmin, winrct->ymin, width, height);
glScissor(winrct->xmin, winrct->ymin, width, height);
wmOrtho2_pixelspace(width, height);
gpuLoadIdentity();
}
void wmPartialViewport(rcti *drawrct, const rcti *winrct, const rcti *partialrct)
{
/* Setup part of the viewport for partial redraw. */
bool scissor_pad;
if (partialrct->xmin == partialrct->xmax) {
/* Full region. */
*drawrct = *winrct;
scissor_pad = true;
}
else {
/* Partial redraw, clipped to region. */
BLI_rcti_isect(winrct, partialrct, drawrct);
scissor_pad = false;
}
int x = drawrct->xmin;
int y = drawrct->ymin;
int width = BLI_rcti_size_x(winrct) + 1;
int height = BLI_rcti_size_y(winrct) + 1;
int scissor_width = BLI_rcti_size_x(drawrct);
int scissor_height = BLI_rcti_size_y(drawrct);
/* Partial redraw rect uses different convention than region rect,
* so compensate for that here. One pixel offset is noticeable with
* viewport border render. */
if (scissor_pad) {
scissor_width += 1;
scissor_height += 1;
}
glViewport(x, y, width, height);
glScissor(x, y, scissor_width, scissor_height);
wmOrtho2_pixelspace(width, height);
gpuLoadIdentity();
}
void wmWindowViewport(wmWindow *win)
{
int width = WM_window_pixels_x(win);
int height = WM_window_pixels_y(win);
glViewport(0, 0, width, height);
glScissor(0, 0, width, height);
wmOrtho2_pixelspace(width, height);
gpuLoadIdentity();
}
void wmOrtho2(float x1, float x2, float y1, float y2)
{
/* prevent opengl from generating errors */
if (x1 == x2) x2 += 1.0f;
if (y1 == y2) y2 += 1.0f;
gpuOrtho(x1, x2, y1, y2, -100, 100);
}
static void wmOrtho2_offset(const float x, const float y, const float ofs)
{
wmOrtho2(ofs, x + ofs, ofs, y + ofs);
}
/* Default pixel alignment for regions. */
void wmOrtho2_region_pixelspace(const ARegion *ar)
{
wmOrtho2_offset(ar->winx, ar->winy, -0.01f);
}
void wmOrtho2_pixelspace(const float x, const float y)
{
wmOrtho2_offset(x, y, -GLA_PIXEL_OFS);
}
void wmGetProjectionMatrix(float mat[4][4], const rcti *winrct)
{
int width = BLI_rcti_size_x(winrct) + 1;
int height = BLI_rcti_size_y(winrct) + 1;
orthographic_m4(mat, -GLA_PIXEL_OFS, (float)width - GLA_PIXEL_OFS, -GLA_PIXEL_OFS, (float)height - GLA_PIXEL_OFS, -100, 100);
}
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