Brecht Van Lommel
e01cadd657
For Blender 2.8 we had to be compatible with very old OpenGL versions, and triple buffer was designed to work without offscreen rendering, by copying the the backbuffer to a texture right before swapping. This way we could avoid redrawing unchanged regions by copying them from this texture on the next redraws. Triple buffer used to suffer from poor performance and driver bugs on specific cards, so alternative draw methods remained available. Now that we require newer OpenGL, we can have just a single draw method that draw each region into an offscreen buffer, and then draws those to the screen. This has some advantages: * Poor 3D view performance when using Region Overlap should be solved now, since we can also cache overlapping regions in offscreen buffers. * Page flip, anaglyph and interlace stereo drawing can be a little faster by avoiding a copy to an intermediate texture. * The new 3D view drawing already writes to an offscreen buffer, which we can draw from directly instead of duplicating it to another buffer. * Eventually we will be able to remove depth and stencil buffers from the window and save memory, though at the moment there are still some tools using it so it's not possible yet. * This also fixes a bug with Eevee sampling not progressing with stereo drawing in the 3D viewport. Differential Revision: https://developer.blender.org/D3061
138 lines
3.6 KiB
C
138 lines
3.6 KiB
C
/*
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*
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* Contributor(s): 2007 Blender Foundation (refactor)
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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/** \file blender/windowmanager/intern/wm_subwindow.c
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* \ingroup wm
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*
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* OpenGL utilities for setting up 2D viewport for window and regions.
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*/
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#include "BLI_math.h"
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#include "BLI_rect.h"
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#include "DNA_screen_types.h"
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#include "DNA_windowmanager_types.h"
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#include "BIF_gl.h"
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#include "GPU_matrix.h"
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#include "WM_api.h"
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void wmViewport(const rcti *winrct)
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{
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int width = BLI_rcti_size_x(winrct) + 1;
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int height = BLI_rcti_size_y(winrct) + 1;
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glViewport(winrct->xmin, winrct->ymin, width, height);
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glScissor(winrct->xmin, winrct->ymin, width, height);
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wmOrtho2_pixelspace(width, height);
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gpuLoadIdentity();
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}
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void wmPartialViewport(rcti *drawrct, const rcti *winrct, const rcti *partialrct)
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{
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/* Setup part of the viewport for partial redraw. */
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bool scissor_pad;
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if (partialrct->xmin == partialrct->xmax) {
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/* Full region. */
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*drawrct = *winrct;
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scissor_pad = true;
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}
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else {
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/* Partial redraw, clipped to region. */
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BLI_rcti_isect(winrct, partialrct, drawrct);
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scissor_pad = false;
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}
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int x = drawrct->xmin - winrct->xmin;
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int y = drawrct->ymin - winrct->ymin;
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int width = BLI_rcti_size_x(winrct) + 1;
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int height = BLI_rcti_size_y(winrct) + 1;
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int scissor_width = BLI_rcti_size_x(drawrct);
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int scissor_height = BLI_rcti_size_y(drawrct);
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/* Partial redraw rect uses different convention than region rect,
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* so compensate for that here. One pixel offset is noticeable with
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* viewport border render. */
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if (scissor_pad) {
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scissor_width += 1;
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scissor_height += 1;
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}
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glViewport(0, 0, width, height);
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glScissor(x, y, scissor_width, scissor_height);
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wmOrtho2_pixelspace(width, height);
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gpuLoadIdentity();
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}
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void wmWindowViewport(wmWindow *win)
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{
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int width = WM_window_pixels_x(win);
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int height = WM_window_pixels_y(win);
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glViewport(0, 0, width, height);
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glScissor(0, 0, width, height);
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wmOrtho2_pixelspace(width, height);
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gpuLoadIdentity();
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}
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void wmOrtho2(float x1, float x2, float y1, float y2)
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{
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/* prevent opengl from generating errors */
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if (x1 == x2) x2 += 1.0f;
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if (y1 == y2) y2 += 1.0f;
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gpuOrtho(x1, x2, y1, y2, -100, 100);
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}
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static void wmOrtho2_offset(const float x, const float y, const float ofs)
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{
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wmOrtho2(ofs, x + ofs, ofs, y + ofs);
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}
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/* Default pixel alignment for regions. */
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void wmOrtho2_region_pixelspace(const ARegion *ar)
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{
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wmOrtho2_offset(ar->winx, ar->winy, -0.01f);
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}
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void wmOrtho2_pixelspace(const float x, const float y)
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{
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wmOrtho2_offset(x, y, -GLA_PIXEL_OFS);
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}
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void wmGetProjectionMatrix(float mat[4][4], const rcti *winrct)
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{
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int width = BLI_rcti_size_x(winrct) + 1;
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int height = BLI_rcti_size_y(winrct) + 1;
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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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}
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