From f278e8dae31efcf26d758fc1d8ce8144702e141b Mon Sep 17 00:00:00 2001
From: FiniteReality <digpoealternate@gmail.com>
Date: Thu, 9 Jan 2025 13:30:48 +0000
Subject: [PATCH] Remove stencil-only patches in MainTarget

Other patches are still necessary as other targets have that as a valid
combination in vanilla anyway, and post chains can be configured to render
to a target with depth disabled.
---
 .../blaze3d/pipeline/MainTarget.java.patch    | 68 +++----------------
 1 file changed, 11 insertions(+), 57 deletions(-)

diff --git a/patches/com/mojang/blaze3d/pipeline/MainTarget.java.patch b/patches/com/mojang/blaze3d/pipeline/MainTarget.java.patch
index 112e72c6e7..eb0f651872 100644
--- a/patches/com/mojang/blaze3d/pipeline/MainTarget.java.patch
+++ b/patches/com/mojang/blaze3d/pipeline/MainTarget.java.patch
@@ -15,80 +15,54 @@
      }
  
      private void createFrameBuffer(int p_166142_, int p_166143_) {
-@@ -30,6 +_,7 @@
-         GlStateManager._texParameter(3553, 10242, 33071);
-         GlStateManager._texParameter(3553, 10243, 33071);
-         GlStateManager._glFramebufferTexture2D(36160, 36064, 3553, this.colorTextureId, 0);
-+        if (this.useDepth) {
-         GlStateManager._bindTexture(this.depthBufferId);
-         GlStateManager._texParameter(3553, 34892, 0);
-         GlStateManager._texParameter(3553, 10241, 9728);
-@@ -37,6 +_,16 @@
+@@ -37,6 +_,10 @@
          GlStateManager._texParameter(3553, 10242, 33071);
          GlStateManager._texParameter(3553, 10243, 33071);
          GlStateManager._glFramebufferTexture2D(36160, 36096, 3553, this.depthBufferId, 0);
-+        }
 +        if (this.useStencil) {
 +            GlStateManager._bindTexture(this.stencilBufferId);
-+            GlStateManager._texParameter(3553, 34892, 0);
-+            GlStateManager._texParameter(3553, 10241, 9728);
-+            GlStateManager._texParameter(3553, 10240, 9728);
-+            GlStateManager._texParameter(3553, 10242, 33071);
-+            GlStateManager._texParameter(3553, 10243, 33071);
 +            GlStateManager._glFramebufferTexture2D(36160, org.lwjgl.opengl.GL32.GL_STENCIL_ATTACHMENT, 3553, this.stencilBufferId, 0);
 +        }
          GlStateManager._bindTexture(0);
          this.viewWidth = maintarget$dimension.width;
          this.viewHeight = maintarget$dimension.height;
-@@ -49,8 +_,14 @@
-     private MainTarget.Dimension allocateAttachments(int p_166147_, int p_166148_) {
+@@ -50,7 +_,14 @@
          RenderSystem.assertOnRenderThreadOrInit();
          this.colorTextureId = TextureUtil.generateTextureId();
-+        if (this.useDepth) {
          this.depthBufferId = TextureUtil.generateTextureId();
-+        }
 +        if (this.useStencil) {
-+            this.stencilBufferId = this.useDepth ? this.depthBufferId : TextureUtil.generateTextureId();
++            this.stencilBufferId = this.depthBufferId;
 +        }
          MainTarget.AttachmentState maintarget$attachmentstate = MainTarget.AttachmentState.NONE;
-+        MainTarget.AttachmentState targetState = MainTarget.AttachmentState.of(true, this.useDepth, this.useStencil);
++        MainTarget.AttachmentState targetState = MainTarget.AttachmentState.COLOR_DEPTH;
++        if (this.useStencil) {
++            targetState = targetState.with(MainTarget.AttachmentState.STENCIL);
++        }
  
          for (MainTarget.Dimension maintarget$dimension : MainTarget.Dimension.listWithFallback(p_166147_, p_166148_)) {
              maintarget$attachmentstate = MainTarget.AttachmentState.NONE;
-@@ -58,11 +_,19 @@
+@@ -58,11 +_,15 @@
                  maintarget$attachmentstate = maintarget$attachmentstate.with(MainTarget.AttachmentState.COLOR);
              }
  
 -            if (this.allocateDepthAttachment(maintarget$dimension)) {
-+            if (this.useDepth && this.useStencil && this.allocateDepthStencilAttachment(maintarget$dimension)) {
++            if (this.useStencil && this.allocateDepthStencilAttachment(maintarget$dimension)) {
 +                maintarget$attachmentstate = maintarget$attachmentstate.with(MainTarget.AttachmentState.DEPTH_STENCIL);
 +            }
 +
-+            else if (this.useDepth && this.allocateDepthAttachment(maintarget$dimension)) {
++            else if (this.allocateDepthAttachment(maintarget$dimension)) {
                  maintarget$attachmentstate = maintarget$attachmentstate.with(MainTarget.AttachmentState.DEPTH);
              }
  
 -            if (maintarget$attachmentstate == MainTarget.AttachmentState.COLOR_DEPTH) {
-+            else if (this.useStencil && this.allocateStencilAttachment(maintarget$dimension)) {
-+                maintarget$attachmentstate = maintarget$attachmentstate.with(MainTarget.AttachmentState.STENCIL);
-+            }
-+
 +            if (maintarget$attachmentstate == targetState) {
                  return maintarget$dimension;
              }
          }
-@@ -86,17 +_,52 @@
+@@ -86,12 +_,24 @@
          return GlStateManager._getError() != 1285;
      }
  
-+    private boolean allocateStencilAttachment(MainTarget.Dimension p_166145_) {
-+        RenderSystem.assertOnRenderThreadOrInit();
-+        GlStateManager._getError();
-+        GlStateManager._bindTexture(this.stencilBufferId);
-+        GlStateManager._texImage2D(3553, 0, org.lwjgl.opengl.GL32.GL_STENCIL_INDEX8, p_166145_.width, p_166145_.height, 0, org.lwjgl.opengl.GL32.GL_STENCIL_INDEX, org.lwjgl.opengl.GL32.GL_BYTE, null);
-+        return GlStateManager._getError() != 1285;
-+    }
-+
 +    private boolean allocateDepthStencilAttachment(MainTarget.Dimension p_166145_) {
 +        RenderSystem.assertOnRenderThreadOrInit();
 +        GlStateManager._getError();
@@ -111,23 +85,3 @@
  
          private static final MainTarget.AttachmentState[] VALUES = values();
  
-         MainTarget.AttachmentState with(MainTarget.AttachmentState p_166164_) {
-             return VALUES[this.ordinal() | p_166164_.ordinal()];
-+        }
-+
-+        static MainTarget.AttachmentState of(boolean color, boolean depth, boolean stencil) {
-+            var result = NONE;
-+            if (color) {
-+                result = result.with(COLOR);
-+            }
-+            if (depth) {
-+                result = result.with(DEPTH);
-+            }
-+            if (stencil) {
-+                result = result.with(STENCIL);
-+            }
-+
-+            return result;
-         }
-     }
-