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gpu: Use premultiplied alpha

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This commit is contained in:
Max Weber
2018-12-25 17:34:43 -07:00
parent e3360c4496
commit b1bfe1c47f
3 changed files with 13 additions and 44 deletions
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2
runelite-client/src/main/java/net/runelite/client/plugins/gpu/GpuPlugin.java
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@@ -1199,7 +1199,7 @@ public class GpuPlugin extends Plugin implements DrawCallbacks
interfaceBuffer.put(pixels);
vertexBuffer.flip();
gl.glBlendFunc(gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA);
gl.glBlendFunc(gl.GL_ONE, gl.GL_ONE_MINUS_SRC_ALPHA);
gl.glBindTexture(gl.GL_TEXTURE_2D, interfaceTexture);
if (canvasWidth != lastCanvasWidth || canvasHeight != lastCanvasHeight)

8
runelite-mixins/src/main/java/net/runelite/mixins/RSMainBufferProviderMixin.java
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@@ -26,7 +26,9 @@ package net.runelite.mixins;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.color.ColorSpace;
import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferInt;
import java.awt.image.DirectColorModel;
import java.awt.image.Raster;
@@ -64,9 +66,11 @@ public abstract class RSMainBufferProviderMixin implements RSMainBufferProvider
// we need to make our own buffered image for the client with the alpha channel enabled in order to
// have alphas for the overlays applied correctly
DataBufferInt dataBufferInt = new DataBufferInt(pixels, pixels.length);
DirectColorModel directColorModel = new DirectColorModel(32, 0xff0000, 0xff00, 0xff, 0xff000000);
DirectColorModel directColorModel = new DirectColorModel(ColorSpace.getInstance(ColorSpace.CS_sRGB),
32, 0xff0000, 0xff00, 0xff, 0xff000000,
true, DataBuffer.TYPE_INT);
WritableRaster writableRaster = Raster.createWritableRaster(directColorModel.createCompatibleSampleModel(width, height), dataBufferInt, null);
BufferedImage bufferedImage = new BufferedImage(directColorModel, writableRaster, false, new Hashtable());
BufferedImage bufferedImage = new BufferedImage(directColorModel, writableRaster, true, new Hashtable());
setImage(bufferedImage);
}

47
runelite-mixins/src/main/java/net/runelite/mixins/Rasterizer2DMixin.java
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@@ -38,7 +38,7 @@ public abstract class Rasterizer2DMixin implements RSClient
private static RSClient client;
@Inject
private static void drawAlpha(int[] pixels, int index, int value, int color, int alpha)
private static void drawAlpha(int[] pixels, int index, int value, int alpha)
{
if (!client.isGpu() || pixels != client.getBufferProvider().getPixels())
{
@@ -46,44 +46,9 @@ public abstract class Rasterizer2DMixin implements RSClient
return;
}
if (alpha == 0)
{
return;
}
int prevColor = pixels[index];
if ((prevColor & 0xFF000000) == 0 || alpha == 255)
{
// No transparency, so we can cheat to save CPU resources
pixels[index] = (color & 0xFFFFFF) | (alpha << 24);
return;
}
if ((prevColor & 0xFF000000) == 0xFF000000)
{
// When the background is opaque, the result will also be opaque,
// so we can simply use the value calculated by Jagex.
pixels[index] = value | 0xFF000000;
return;
}
int prevAlpha = (prevColor >>> 24) * (255 - alpha) >>> 8;
int finalAlpha = alpha + prevAlpha;
// Scale alphas so (relativeAlpha >>> 8) is approximately equal to (alpha / finalAlpha).
// Avoiding extra divisions increase performance by quite a bit.
// And with divisions we get a problems if dividing a number where
// the last bit is 1 (as it will become negative).
int relativeAlpha1 = (alpha << 8) / finalAlpha;
int relativeAlpha2 = (prevAlpha << 8) / finalAlpha;
// Red and blue are calculated at the same time to save CPU cycles
int finalColor =
(((color & 0xFF00FF) * relativeAlpha1 + (prevColor & 0xFF00FF) * relativeAlpha2 & 0xFF00FF00) |
((color & 0x00FF00) * relativeAlpha1 + (prevColor & 0x00FF00) * relativeAlpha2 & 0x00FF0000)) >>> 8;
pixels[index] = finalColor | (finalAlpha << 24);
// (int) x * 0x8081 >>> 23 is equivalent to (short) x / 255
int outAlpha = alpha + ((pixels[index] >>> 24) * (255 - alpha) * 0x8081 >>> 23);
pixels[index] = value & 0x00FFFFFF | outAlpha << 24;
}
@Copy("drawGradientAlpha")
@@ -158,7 +123,7 @@ public abstract class Rasterizer2DMixin implements RSClient
{
int var20 = pixels[var11];
var20 = ((var20 & 16711935) * var17 >> 8 & 16711935) + (var17 * (var20 & 65280) >> 8 & 65280);
drawAlpha(pixels, var11++, var18 + var20, var16, var15);
drawAlpha(pixels, var11++, var18 + var20, var15);
}
var11 += var10;
@@ -267,7 +232,7 @@ public abstract class Rasterizer2DMixin implements RSClient
int var21 = 255 - var20;
int var22 = pixels[var14];
int var23 = ((var19 & 16711935) * var20 + (var22 & 16711935) * var21 & -16711936) + (var20 * (var19 & 65280) + var21 * (var22 & 65280) & 16711680) >> 8;
drawAlpha(pixels, var14++, var23, var19, var20);
drawAlpha(pixels, var14++, var23, var20);
}
var14 += var11;