URenderPipeline: Fix incorrect blend state on 1.17 - 1.20.6

The blend state passed to `UShader.fromLegacyShader`, which we ignore
explicitly via `skipBlendState` on versions prior to 1.17, can still get
applied by MC's shader class on 1.17 - 1.20.6 and we can't easily
disable/overwrite that because it happens far down the draw method call.
As such, we must pass the correct blend state to it, otherwise it'll
sometimes disable blending when we want it enabled.

This does not affect 1.21+ because MC's shader class no longer cares
about the blend state on those versions.

Additionally, this issue is masked by the fact that the caching in MC's
GlBlendState class is horribly broken in multiple ways, so often it
wouldn't actually apply at all, thereby making this issue inconsistent
even on 1.17 - 1.20.6.

Linear: EM-3163
GitHub: #100

Author: Johni0702

src/main/kotlin/gg/essential/universal/render/URenderPipeline.kt

@@ -8,6 +8,7 @@ import org.lwjgl.opengl.GL11
 
 //#if STANDALONE
 //$$ import gg.essential.universal.shader.GlShader
+//$$ import gg.essential.universal.shader.UShader
 //$$ import gg.essential.universal.standalone.render.DefaultShader
 //$$ import gg.essential.universal.standalone.render.VertexFormat
 //$$ import gg.essential.universal.vertex.UBuiltBufferInternal
@@ -31,6 +32,7 @@ import net.minecraft.util.ResourceLocation
 //$$ import org.apache.commons.codec.digest.DigestUtils
 //$$ import java.util.function.BiFunction
 //#else
+import gg.essential.universal.shader.UShader
 import gg.essential.universal.vertex.UBuiltBufferInternal
 import net.minecraft.client.renderer.WorldVertexBufferUploader
 //#endif
@@ -104,7 +106,7 @@ class URenderPipeline private constructor(
     }
 
     internal fun bind() {
-        shader?.bind()
+        shader?.bind(glState.blendState)
     }
 
     internal fun unbind() {
@@ -207,15 +209,19 @@ class URenderPipeline private constructor(
 
     private sealed interface ShaderSupplier {
         //#if MC<12105 || STANDALONE
-        fun bind()
+        fun bind(blendState: BlendState)
         fun unbind()
         //#endif
 
         class LegacySource(val vertexFormat: VertexFormat, val vertSource: String, val fragSource: String) : ShaderSupplier {
             //#if MC<12105 || STANDALONE
-            val shader by lazy { gg.essential.universal.shader.UShader.fromLegacyShader(vertSource, fragSource, BlendState.DISABLED, vertexFormat) }
+            lateinit var shader: UShader
+
+            override fun bind(blendState: BlendState) {
+                if (!::shader.isInitialized) {
+                    shader = UShader.fromLegacyShader(vertSource, fragSource, blendState, vertexFormat)
+                }
 
-            override fun bind() {
                 //#if MC>=12102 && !STANDALONE
                 //$$ RenderSystem.setShader((shader as MCShader).mc)
                 //#elseif MC>=11700 && !STANDALONE
@@ -242,7 +248,7 @@ class URenderPipeline private constructor(
         //$$ class Mc(val vert: Identifier, val frag: Identifier, val samplers: List<String>, val uniforms: Map<String, UniformType>) : ShaderSupplier
         //#else
         //$$ class Mc(val shader: Supplier<Shader>) : ShaderSupplier {
-        //$$     override fun bind() {
+        //$$     override fun bind(blendState: BlendState) {
                 //#if MC>=12102
                 //$$ RenderSystem.setShader(shader.get())
                 //#else