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Artificially render transparency when no off-screen rendering

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This commit is contained in:
SiboVG 2023-03-30 13:27:44 +02:00
parent 0550c2995c
commit c74ef62900
1 changed files with 31 additions and 3 deletions
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32
swing/src/net/sf/openrocket/gui/figure3d/photo/PhotoPanel.java
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@ -1,9 +1,7 @@
package net.sf.openrocket.gui.figure3d.photo; package net.sf.openrocket.gui.figure3d.photo;
import java.awt.AlphaComposite;
import java.awt.BorderLayout; import java.awt.BorderLayout;
import java.awt.Component; import java.awt.Component;
import java.awt.Graphics2D;
import java.awt.Rectangle; import java.awt.Rectangle;
import java.awt.SplashScreen; import java.awt.SplashScreen;
import java.awt.event.MouseEvent; import java.awt.event.MouseEvent;
@ -158,6 +156,7 @@ public class PhotoPanel extends JPanel implements GLEventListener {
final GLProfile glp = GLProfile.get(GLProfile.GL2); final GLProfile glp = GLProfile.get(GLProfile.GL2);
final GLCapabilities caps = new GLCapabilities(glp); final GLCapabilities caps = new GLCapabilities(glp);
caps.setBackgroundOpaque(false);
if (Application.getPreferences().getBoolean( if (Application.getPreferences().getBoolean(
Preferences.OPENGL_ENABLE_AA, true)) { Preferences.OPENGL_ENABLE_AA, true)) {
@ -311,6 +310,27 @@ public class PhotoPanel extends JPanel implements GLEventListener {
} }
} }
/**
* Blend two colors
* @param color1 first color to blend
* @param color2 second color to blend
* @param ratio blend ratio. 0 = full color 1, 0.5 = mid-blend, 1 = full color 2
* @return blended color
*/
private static Color blendColors(Color color1, Color color2, double ratio) {
if (ratio < 0 || ratio > 1) {
throw new IllegalArgumentException("Blend ratio must be between 0 and 1");
}
double inverseRatio = 1 - ratio;
int r = (int) ((color1.getRed() * inverseRatio) + (color2.getRed() * ratio));
int g = (int) ((color1.getGreen() * inverseRatio) + (color2.getGreen() * ratio));
int b = (int) ((color1.getBlue() * inverseRatio) + (color2.getBlue() * ratio));
return new Color(r, g, b);
}
private void draw(final GLAutoDrawable drawable, float dx) { private void draw(final GLAutoDrawable drawable, float dx) {
GL2 gl = drawable.getGL().getGL2(); GL2 gl = drawable.getGL().getGL2();
GLU glu = new GLU(); GLU glu = new GLU();
@ -339,7 +359,15 @@ public class PhotoPanel extends JPanel implements GLEventListener {
new float[] { spc * color[0], spc * color[1], spc * color[2], 1 }, new float[] { spc * color[0], spc * color[1], spc * color[2], 1 },
0); 0);
// Machines that don't use off-screen rendering can't render transparent background, so we create it
// artificially by blending the sky color with white (= color that is rendered as transparent background)
if (!Application.getPreferences().getBoolean(
Preferences.OPENGL_USE_FBO, false)) {
convertColor(blendColors(p.getSkyColor(), new Color(255, 255, 255), 1-p.getSkyColorOpacity()),
color);
} else {
convertColor(p.getSkyColor(), color); convertColor(p.getSkyColor(), color);
}
gl.glClearColor(color[0], color[1], color[2], color[3]); gl.glClearColor(color[0], color[1], color[2], color[3]);
gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT); gl.glClear(GL.GL_COLOR_BUFFER_BIT | GL.GL_DEPTH_BUFFER_BIT);