Tessellator.diff

--- ../Tessellator.orig 2014-04-23 03:53:04.774228361 +0400
+++ ../Tessellator.new  2014-04-23 03:51:58.706227799 +0400
@@ -10,8 +10,10 @@
 import java.util.Arrays;
 import java.util.PriorityQueue;
 import net.minecraft.client.shader.TesselatorVertexState;
+import net.minecraft.client.Minecraft;
 import net.minecraft.client.util.QuadComparator;
 import org.lwjgl.opengl.GL11;
+import org.lwjgl.opengl.GL20;
 
 @SideOnly(Side.CLIENT)
 public class Tessellator
@@ -103,6 +105,43 @@
         instance.defaultTexture = true;
     }
 
+    private int fragmentShader = -1;
+    private int shaderProgram;
+    private int defaultTexSampler;
+    private int lightmapTexSampler;
+
+    //private String shaderCode = "void main() {\ngl_FragColor = gl_Color;\n}\n";
+    private String shaderCode = "uniform sampler2D defaultTex;\nuniform sampler2D lightmapTex;\nvoid main() {\ngl_FragColor = texture2D(defaultTex, gl_TexCoord[0].st) * texture2D(lightmapTex, gl_TexCoord[1].st) * gl_Color;\n}\n";
+
+    private void loadShader()
+    {
+        fragmentShader = GL20.glCreateShader(GL20.GL_FRAGMENT_SHADER);
+        GL20.glShaderSource(fragmentShader, shaderCode);
+        GL20.glCompileShader(fragmentShader);
+        if(GL20.glGetShaderi(fragmentShader, GL20.GL_COMPILE_STATUS) == GL11.GL_FALSE)
+        {
+            GL20.glDeleteShader(fragmentShader);
+            int maxLength = GL20.glGetShaderi(fragmentShader, GL20.GL_INFO_LOG_LENGTH);
+            String log = GL20.glGetShaderInfoLog(fragmentShader, maxLength);
+            throw new RuntimeException("Could not compile shader: " + log);
+        }
+        shaderProgram = GL20.glCreateProgram();
+        GL20.glAttachShader(shaderProgram, fragmentShader);
+        GL20.glLinkProgram(shaderProgram);
+        if(GL20.glGetProgrami(shaderProgram, GL20.GL_LINK_STATUS) == GL11.GL_FALSE)
+        {
+            GL20.glDeleteProgram(shaderProgram);
+            GL20.glDeleteShader(fragmentShader);
+            int maxLength = GL20.glGetProgrami(shaderProgram, GL20.GL_INFO_LOG_LENGTH);
+            String log = GL20.glGetProgramInfoLog(shaderProgram, maxLength);
+            throw new RuntimeException("Could not link program: " + log);
+        }
+        //GL20.glDetachShader(shaderProgram, fragmentShader);
+
+        defaultTexSampler = GL20.glGetUniformLocation(shaderProgram, "defaultTex");
+        lightmapTexSampler = GL20.glGetUniformLocation(shaderProgram, "lightmapTex");
+    }
+
     /**
      * Draws the data set up in this tessellator and resets the state to prepare for new drawing.
      */
@@ -135,6 +174,16 @@
 
                 if (this.hasBrightness)
                 {
+                    if(this.fragmentShader == -1)
+                    {
+                        this.loadShader();
+                    }
+                    //if(Minecraft.getMinecraft().gameSettings.showDebugInfo)
+                    {
+                        GL20.glUseProgram(shaderProgram);
+                        GL20.glUniform1i(defaultTexSampler, 0);
+                        GL20.glUniform1i(lightmapTexSampler, 1);
+                    }
                     OpenGlHelper.setClientActiveTexture(OpenGlHelper.lightmapTexUnit);
                     this.shortBuffer.position(14);
                     GL11.glTexCoordPointer(2, 32, this.shortBuffer);
@@ -169,6 +218,10 @@
 
                 if (this.hasBrightness)
                 {
+                    //if(Minecraft.getMinecraft().gameSettings.showDebugInfo)
+                    {
+                        GL20.glUseProgram(0);
+                    }
                     OpenGlHelper.setClientActiveTexture(OpenGlHelper.lightmapTexUnit);
                     GL11.glDisableClientState(GL11.GL_TEXTURE_COORD_ARRAY);
                     OpenGlHelper.setClientActiveTexture(OpenGlHelper.defaultTexUnit);