Add custom position/tex/color shader without fragment discarding

src/main/java/ru/dbotthepony/mc/otm/mixin/MixinGameRenderer.java

@@ -1,11 +1,13 @@
 package ru.dbotthepony.mc.otm.mixin;
 
 import net.minecraft.client.renderer.GameRenderer;
+import net.minecraft.server.packs.resources.ResourceProvider;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 import ru.dbotthepony.mc.otm.client.render.GlitchRenderer;
+import ru.dbotthepony.mc.otm.client.render.RenderHelperKt;
 
 @Mixin(GameRenderer.class)
 public class MixinGameRenderer {
@@ -19,4 +21,12 @@ public class MixinGameRenderer {
 	private void render(float p_109094_, long p_109095_, boolean p_109096_, CallbackInfo ci) {
 		GlitchRenderer.render();
 	}
+
+	@Inject(
+		method = "reloadShaders(Lnet/minecraft/server/packs/resources/ResourceProvider;)V",
+		at = @At("HEAD")
+	)
+	private void reloadShaders(ResourceProvider p_250719_, CallbackInfo ci) {
+		RenderHelperKt.reloadShaders(p_250719_);
+	}
 }

src/main/kotlin/ru/dbotthepony/mc/otm/client/render/RenderHelper.kt

@@ -8,11 +8,14 @@ import net.minecraft.client.renderer.GameRenderer
 import net.minecraft.client.renderer.RenderStateShard
 import net.minecraft.client.renderer.RenderStateShard.LineStateShard
 import net.minecraft.client.renderer.RenderType
+import net.minecraft.client.renderer.ShaderInstance
 import net.minecraft.client.renderer.texture.TextureAtlasSprite
 import net.minecraft.resources.ResourceLocation
+import net.minecraft.server.packs.resources.ResourceProvider
 import org.joml.Matrix4f
 import org.lwjgl.opengl.GL11.GL_ALWAYS
 import org.lwjgl.opengl.GL11.GL_LESS
+import ru.dbotthepony.mc.otm.OverdriveThatMatters
 import ru.dbotthepony.mc.otm.client.minecraft
 import ru.dbotthepony.mc.otm.core.math.RGBAColor
 import java.util.*
@@ -23,6 +26,7 @@ import kotlin.math.cos
 import kotlin.math.pow
 import kotlin.math.roundToInt
 import kotlin.math.sin
+import kotlin.properties.Delegates
 
 var is3DContext = false
 
@@ -35,6 +39,13 @@ var lockBlendFunc = false
 
 private val defaultUV = UVCoords(0f, 0f, 1f, 1f)
 
+var customTexColorShader: ShaderInstance by Delegates.notNull()
+	private set
+
+fun reloadShaders(provider: ResourceProvider) {
+	customTexColorShader = ShaderInstance(provider, ResourceLocation(OverdriveThatMatters.MOD_ID, "position_tex_color"), DefaultVertexFormat.POSITION_TEX_COLOR)
+}
+
 fun renderRect(
 	matrix: Matrix4f,
 	x: Float,
@@ -108,7 +119,7 @@ fun renderTexturedRect(
 	if (color.isWhite)
 		RenderSystem.setShader(GameRenderer::getPositionTexShader)
 	else
-		RenderSystem.setShader(GameRenderer::getPositionTexColorShader)
+		RenderSystem.setShader { customTexColorShader }
 
 	if (texture != null)
 		RenderSystem.setShaderTexture(0, texture)

src/main/resources/assets/overdrive_that_matters/shaders/core/position_tex_color.fsh

@@ -0,0 +1,14 @@
+#version 150
+
+uniform sampler2D Sampler0;
+
+uniform vec4 ColorModulator;
+
+in vec2 texCoord0;
+in vec4 vertexColor;
+
+out vec4 fragColor;
+
+void main() {
+    fragColor = texture(Sampler0, texCoord0) * vertexColor * ColorModulator;
+}

src/main/resources/assets/overdrive_that_matters/shaders/core/position_tex_color.json

@@ -0,0 +1,22 @@
+{
+    "blend": {
+        "func": "add",
+        "srcrgb": "srcalpha",
+        "dstrgb": "1-srcalpha"
+    },
+    "vertex": "overdrive_that_matters:position_tex_color",
+    "fragment": "overdrive_that_matters:position_tex_color",
+    "attributes": [
+        "Position",
+        "UV0",
+        "Color"
+    ],
+    "samplers": [
+        { "name": "Sampler0" }
+    ],
+    "uniforms": [
+        { "name": "ModelViewMat", "type": "matrix4x4", "count": 16, "values": [ 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0 ] },
+        { "name": "ProjMat", "type": "matrix4x4", "count": 16, "values": [ 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 1.0 ] },
+        { "name": "ColorModulator", "type": "float", "count": 4, "values": [ 1.0, 1.0, 1.0, 1.0 ] }
+    ]
+}

src/main/resources/assets/overdrive_that_matters/shaders/core/position_tex_color.vsh

@@ -0,0 +1,18 @@
+#version 150
+
+in vec3 Position;
+in vec2 UV0;
+in vec4 Color;
+
+uniform mat4 ModelViewMat;
+uniform mat4 ProjMat;
+
+out vec2 texCoord0;
+out vec4 vertexColor;
+
+void main() {
+    gl_Position = ProjMat * ModelViewMat * vec4(Position, 1.0);
+
+    texCoord0 = UV0;
+    vertexColor = Color;
+}