wm_subwindow.cc

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/* SPDX-FileCopyrightText: 2001-2002 NaN Holding BV. All rights reserved.
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */

 
#include "BLI_math_geom.h"
#include "BLI_rect.h"
 
#include "DNA_screen_types.h"
#include "DNA_windowmanager_types.h"
 
#include "GPU_matrix.hh"
#include "GPU_state.hh"
#include "GPU_viewport.hh"
 
#include "WM_api.hh"
 
void wmViewport(const rcti *winrct)
{
  int width = BLI_rcti_size_x(winrct) + 1;
  int height = BLI_rcti_size_y(winrct) + 1;
 
  GPU_viewport(winrct->xmin, winrct->ymin, width, height);
  GPU_scissor(winrct->xmin, winrct->ymin, width, height);
 
  wmOrtho2_pixelspace(width, height);
  GPU_matrix_identity_set();
}
 
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 - winrct->xmin;
  int y = drawrct->ymin - winrct->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;
  }
 
  GPU_viewport(0, 0, width, height);
  GPU_scissor(x, y, scissor_width, scissor_height);
 
  wmOrtho2_pixelspace(width, height);
  GPU_matrix_identity_set();
}
 
static void wmOrtho2_offset(const float x, const float y, const float ofs);
 
void wmWindowViewport_ex(const wmWindow *win, float offset)
{
  const blender::int2 win_size = WM_window_native_pixel_size(win);
 
  GPU_viewport(0, 0, win_size[0], win_size[1]);
  GPU_scissor(0, 0, win_size[0], win_size[1]);
 
  wmOrtho2_offset(win_size[0], win_size[1], offset);
  GPU_matrix_identity_set();
}
 
void wmWindowViewport(const wmWindow *win)
{
  wmWindowViewport_ex(win, -GLA_PIXEL_OFS);
}
 
void wmOrtho2(float x1, float x2, float y1, float y2)
{
  /* Prevent opengl from generating errors. */
  if (x2 == x1) {
    x2 += 1.0f;
  }
  if (y2 == y1) {
    y2 += 1.0f;
  }
 
  GPU_matrix_ortho_set(
      x1, x2, y1, y2, GPU_MATRIX_ORTHO_CLIP_NEAR_DEFAULT, GPU_MATRIX_ORTHO_CLIP_FAR_DEFAULT);
}
 
static void wmOrtho2_offset(const float x, const float y, const float ofs)
{
  wmOrtho2(ofs, x + ofs, ofs, y + ofs);
}
 
void wmOrtho2_region_pixelspace(const ARegion *region)
{
  wmOrtho2_offset(region->winx, region->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,
                  GPU_MATRIX_ORTHO_CLIP_NEAR_DEFAULT,
                  GPU_MATRIX_ORTHO_CLIP_FAR_DEFAULT);
}