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This article is a work in progress. 
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This article is about the in-game shaders. For the shaders provided by the modification, see ftb:Optifine.

Shaders are used to depict how to render the game.

Java Edition[]

There are two kinds of shaders: core shaders and post-processing shaders.

Core shaders are used to render different parts of the game.

Post-processing shaders are used for mob view in spectator mode, blending of translucent layers in Fabulous! graphics, and glowing status effect.

Shaders are written in OpenGL Shading Language (GLSL). Each single render program come in two parts, vertex and fragment. The vertex shaders modify the positions of individual vertices and are most often used to create waving foliage and water. Fragment shaders are applied to every pixel and can be used to add effects like bloom, god rays, and blur.

Shaders are stored in the assets/minecraft/shaders/ directory of minecraft.jar. Can be replaced with a resource pack. Note that if any error occurs when loading the shaders, the resource pack will be disabled and fabulous graphics mode will be turned off.

Core shaders[]

Core shaders are responsible for rendering parts of the game. They are used to render not only blocks and entities when playing the game, but also the main screen, option screen and so on.

Each core shader is a single render program defined by a JSON file, in which vertex and fragment shader file are specified.

Core shaders are stored in the assets/minecraft/shaders/core directory of minecraft.jar.

The following table lists them all including a short description of what the shader renders, as well as, an image highlighting the shaders target in red.

Include shaders[]

Include shaders aren't stand-alone shader programs. They should be invoked by other shader files.

Include shaders contain helper functions that are commonly used. To import a glsl file in a shader use #moj_import <FILENAME.glsl> or #moj_import "FILENAME.glsl". NOTE: The imported file needs to end with an empty line, otherwise the shader will not load.

Include shaders are stored in the assets/minecraft/shaders/include directory of minecraft.jar.

Name Description
fog Contains the linear_fog function to calculate the color based on the vertex distance.
light Contains the minecraft_mix_light function.
matrix Contains the mat2_rotate_z function that returns the rotation matrix for a vec2 around the z-axis.
projection Contains the projection_from_position function.

Post-processing shaders[]

Currently, post-processing shaders is used for mob view in spectator mode, blending of translucent layers in Fabulous! graphics, and glowing status effect.

Post-processing shaders use "post" files to define a pipeline made up of applying a sequence of "programs".

Each "program" is then defined by another JSON file, in which a single render program is defined.

"post" files are stored in the assets/minecraft/shaders/post directory of the version .jar, while "program" files are stored in assets/minecraft/shaders/program.

There are only 5 post-processing shaders used in the game:

  • creeper.json: Used when spectating a creeper
  • invert.json: Used when spectating an enderman
  • spider.json: Used when spectating a spider
  • entity_outline.json: Used when a glowing entity is on screen
  • transparency.json: Used when in "Fabulous!" graphics mode.

In these two directories, there are also many useless shaders, which were used for "Super Secret Settings" before 1.9 (15w31a). See Shaders/Before 1.9.

Render process[]

Jigsaw Block (top texture) JE2 BE2.png
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File format[]

Render program[]

  • The root tag
    •   blend: Settings for OpenGL blending.
      •   func: Operator to be used when blending. Can be add, subtract, reversesubtract, reverse_subtract, min, or max. Not case sensitive. Defaults to add. Used as mode parameter of glBlendEquation
      •   srcrgb: Used as sfactor parameter of glBlendFunc or srcRGB parameter of glBlendFuncSeparate. Can be 0, 1, srccolor, 1-srccolor, dstcolor, 1-dstcolor, srcalpha, 1-srcalpha, dstalpha, or1-dstalpha. Case insensitive. Ignores "_". "1", "0", "-" can be replaced by "one", "zero", "minus".
      •   dstrgb: Used as dfactor parameter of glBlendFunc or dstRGB parameter of glBlendFuncSeparate. Can be 0, 1, srccolor, 1-srccolor, dstcolor, 1-dstcolor, srcalpha, 1-srcalpha, dstalpha, or1-dstalpha. Case insensitive. Ignores "_". "1", "0", "-" can be replaced by "one", "zero", "minus".
      •   srcalpha: Used as srcalpha parameter of glBlendFuncSeparate. Can be 0, 1, srccolor, 1-srccolor, dstcolor, 1-dstcolor, srcalpha, 1-srcalpha, dstalpha, or1-dstalpha. Case insensitive. Ignores "_". "1", "0", "-" can be replaced by "one", "zero", "minus".
      •   dstalpha: Used as dstalpha parameter of glBlendFuncSeparate. Can be 0, 1, srccolor, 1-srccolor, dstcolor, 1-dstcolor, srcalpha, 1-srcalpha, dstalpha, or1-dstalpha. Case insensitive. Ignores "_". "1", "0", "-" can be replaced by "one", "zero", "minus".
    •   cull: If true, run glEnable(GL_CULL_FACE). If false, run glDisable(GL_CULL_FACE). Defaults to true.
    •   vertex: The name (without file extension) of the vertex shader to be used.
    •   fragment: The name (without file extension) of the fragment shader to be used.
    •   attributes: Attributes to be used by the vertex shader.
      • : An attribute. Available values are hard-coded.
    •   samplers: A list of samplers that may be used in the shaders.
    •   uniforms: A list of uniforms that can be used in the shaders.
      • : A uniform.
        •   name: The name of the uniform as referenced in the GLSL code. Some names give a uniform special behavior(Note that these following special uniform does not work in all shader programs):
          • (float) Time: A value from 0 to 1, representing time in seconds. Resets every second. Only valid in post-processing shaders.
          • (vec2) InSize: The width and height of the input buffer in pixels. Only valid in post-processing shaders.
          • (vec2) OutSize: The width and height of the output buffer in pixels. Only valid in post-processing shaders.
          • (vec2) AuxSize<i>: The width and height of the auxiliary buffer in pixels. <i> should be replaced by the order of the auxtarget in the render pass. Only valid in post-processing shaders.
          • (matrix4x4) ModelViewMat: The model-view matrix. Only valid in core shaders.
          • (matrix4x4) ProjMat: The projection matrix.
          • (matrix4x4) TextureMat: 4D matrix used to transform UV's for item glint effects. Only valid in core shaders.
          • (vec2) ScreenSize: vec2 containing the current framebuffer width and height, in that order.
          • (vec4) ColorModulator: A global vec4 of multipliers that can be set from the game code as a color multiplier. Only valid in core shaders.
          • (vec3) Light0_Direction: First light direction as vec3 for entity rendering. Only valid in core shaders.
          • (vec3) Light1_Direction: Second light direction, see Light0_Direction. Only valid in core shaders.
          • (float) FogStart: Fog start distance from the camera. Only valid in core shaders.
          • (float) FogEnd: Fog end distance from the camera. Only valid in core shaders.
          • (vec4) FogColor: vec4 fog color. Only valid in core shaders.
          • (float) LineWidth: Line width, used for rendering wireframe lines such as the block selection frame and debug hitboxes. Only valid in core shaders.
          • (float) GameTime: Global time of the world, in fractional days. Only valid in core shaders.
          • (vec3) ChunkOffset: When rendering a chunk section, the offset from the camera world position to the chunk section's base point. Only valid in core shaders.
        •   type: The type of the uniform. Can be one of int, float, matrix4x4, matrix3x3 and matrix2x2. int can also be interpreted as ivec2, ivec3 or ivec4 depending on how many values are actually included in values. float can also be interpreted as vec2, vec3 or vec4 depending on how many values are actually included in values.
        •   count: The number of values included in values.
        •   values: The value of the uniform, given as a list of floats. The length of the list should be the same as count.

Render pipeline[]

Here's the process of how a post-processing shader is used in game: first, the shader initializes all of the render targets specified in the "targets" list with the proper width and height. After that, the shader goes through each render pass specified in the "passes" list from first in the list to last in the list. Each pass will apply the program shader on the render target specified by "intarget" (with any extra data provided by other auxiliary render targets) and output the end result on the render target specified by "outtarget".

  • The root tag
    •  targets: A list of render targets. They can be buffer provided by the game, or new buffer with any name.
      • : The name of a render target. The size defaults to screen resolution. Post-processing shader transparency must contain render targets named translucentitemEntityparticlesweather and clouds. Post-processing shader entity_outline must contain render target named final.
      • : A render target to add.
        •  name: The name of the render target to add.
        •  width: The width of the render target.
        •  height: The height of the render target.
    •  passes: A list of passes.
      • : A render pass.
        •  name: The name of a program shader to apply on the input and post into the output. Use "blit" to copy the data from intarget to outtarget.
        •  intarget: The name of a render target to use as an input. Use minecraft:main to specify the main screen.
        •  outtarget: The name of a render target to output to. It should not be the same as intarget. Use minecraft:main to specify the main screen.
        •  auxtargets: A list of auxiliary targets.
          • An auxiliary target.
            •  name: The auxiliary target's name that is passed into the "Program" JSON.
            •  id: The auxiliary target's id. Either points into the name of a buffer that is defined in targets or into the location of a texture under assets/<namespace>/textures/effect (use a resource location to reference it). Append :depth after the name of the buffer to access its depth buffer. For example, to access the depth buffer of minecraft:main, use minecraft:main:depth.
            •  width: Required if id references a texture. Describes the width of the texture in pixels.
            •  height: Required if id references a texture. Describes the height of the texture in pixels.
            •  bilinear: Required if id references a texture. Determines whether the scaling algorithm used for the image is bilinear or nearest neighbour.
        •  uniforms: A list of overrides that change the values in the uniforms list in the "Program" JSON.
          • : A uniform.
            •  name: The name of the field that should be changed.
            •  values: The values that the field should be changed to.

Tutorials and useful docs[]

Here are some guides with additional information on creating shaders:

Bedrock Edition[]

Jigsaw Block (top texture) JE2 BE2.png
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Since Bedrock Edition 1.16.200, third party shader resource packs are no longer supported on Windows 10 or Console versions, although they still work on mobile devices.

History[]

Java Edition
1.7.213w38aShaders were added for Super Secret Settings.
1.814w05aThe Creeper and Spider shaders were added. Shaders are automatically applied in spectator mode when viewing the world as a Creeper, Spider or Enderman.
14w05bShaders are now removed from view when changing perspective while spectating a mob.[2]
F4 now toggles different shaders rather than turning them off.[2]
14w06aThe Entity Outline shader was added.
1.915w31aRemoved the Super Secret Settings button for an internal rewrite.[3]
1.1620w22aThe Transparency shader was added for Fabulous! graphics mode.
1.1721w10aCore shaders were added.

Issues[]

Issues relating to "Shaders" are maintained on the bug tracker. Report issues there.

References[]

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