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-Shader Effects
-Shader effects let users create their own raster effects. You need two files to get started with shader effects.
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-* The XML **\*.gre** file defines properties visible in the interface, and values passed to the fragment shader.
-* The GLSL fragment shader **\*.frag** file defines the effect for a given set of values defined in **\*.gre** file.
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-To use shader effects, both **\*.gre** and **\*.frag** files have to be placed in **`home_directory/.enve/ShaderEffects`** directory.
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-The **\*.gre** and **\*.frag** files have to share a name, e.g., **`exampleEffect.gre`** and **`exampleEffect.frag`**.
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-Here you can find modest examples
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-Definitions (*.gre file)
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-Root Element
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-```xml
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-```
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-A **ShaderEffect** root element has only a **name** attribute. The **name** will be visible in enve interface.
-The **ShaderEffect** encloses **Properties**, a **Script**, **glValues**, and a **Margin** for the effect.
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-Properties
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-There are three types of properties:
-* **int** - integer properties
-* **float** - floating-point number properties
-* **vec2** - two-value float properties
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-All types of properties are animatable, meaning their values can change with time.
-All properties have to be defined inside **Properties** element, and use the **Property** tag name.
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-```xml
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-```
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-You can see the resulting interface elements in the screenshot below.
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-Property Attributes
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-* **name** - name that will be used to reference the property from the **Script** and from the fragment shader(if **glValue** is true), cannot contain spaces or special characters, e.g., **`exampleProperty`**
-* **nameUI** - name that will be visible in enve interface, e.g., **`example property`**
-* **xnameUI** - name of the x component of **vec2** property
-* **ynameUI** - name of the y component of **vec2** property
-* **type** - type of the property, e.g., **`int`**, **`float`**, **`vec2`**
-* **min** - minimum value that can be assigned to the property, e.g., **`0`**, **`[0, 0]`**
-* **max** - maximum value that can be assigned to the property, e.g., **`100`**, **`[100, 50]`**
-* **ini** - initial value for the property, e.g., **`55`**, **`[75, 25]`**
-* **step** - recommended value increment for user interactions with the interface, e.g., **`1`**, **`[1, 1]`**
-* **glValue** - specifies whether the property is used in the fragment shader, e.g., **`true`**, **`false`**
-* **resolutionScaled** - specifies whether the property value should be multiplied by scene resolution, e.g., **`true`**, **`false`**
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-As you might have guessed, the **`[x, y]`** attribute values are only supported by **vec2** type, **vec2** also accepts **`x`**, that will automatically be expanded to **`[x, x]`**.
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-Default Attribute Values
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-* **name** - no default value, cannot be omitted
-* **nameUI** - the same value as **name**
-* **xnameUI** - **`x`**
-* **ynameUI** - **`y`**
-* **type** - no default value, cannot be omitted
-* **min** - **`0`**
-* **max** - **`100`**
-* **ini** - **`0`**
-* **step** - **`1`**
-* **glValue** - **`false`**
-* **resolutionScaled** - **`false`**
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-Script (optional)
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-```xml
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-```
-**Script** is divided into two portions, both of which should be written in JavaScript:
-* **Definitions** - here you can define functions, it is run only once, it cannot access property values
-* **Calculate** - it is run every time the effect is being called, lets you **extern** variable to use them in **glValue** and **Margin** scripts. You can use functions defined in **Definitions**. You can access **Property** values.
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-Values for **vec2** properties are passed as arrays `[x, y]`.
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-Enve provides **_eRect**, an additional variable you can access directly from **Calculate**, and **glValue** and **Margin** scripts. **_eRect** coresponds to the bounding rectangle `[x, y, width, height]` for the object the effect is beign applied to. Please note, that the **_eRect** corresponds to the bounding rectangle prior to applying the **Margin**. To see how to use **_eRect**, you can checkout the example eExplode effect and eDots.
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-glValues (optional)
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-*.gre file:
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-```xml
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-```
-*.frag file:
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-```GLSL
-#version 330 core
-layout(location = 0) out vec4 fragColor;
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-in vec2 texCoord
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-uniform sampler2D texture;
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-uniform float exampleValue; // the same name as the glValue
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-void main(void) {
- fragColor = vec4(color.rgb, exampleValue);
-}
-```
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-**glValues** have no representation in the user interface. Instead, they let you pass variables you defined as **extern**, in the **Calculate** portion of the **Script**, to the fragment shader.
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-Attributes
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-* **name** - name that will be used to reference the value from the fragment shader, cannot contain spaces or special characters, e.g., **`exampleValue`**
-* **type** - type of the value, e.g., **`float`**, **`vec2`**, **`vec3`**, **`vec4`**, **`int`**, **`ivec2`**, **`ivec3`**, **`ivec4`**
-* **value** - specifies the value, e.g., **`0`**, **`exampleProperty*5`**, **`[exampleVec2Property[0]*5, exampleVec2Value[1]*5]`**(**vec2** only)
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-Margin
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-Some effects might need to expand the texture size, e.g., blur effects require additional space depending on the radius.
-Enve will expand the texture for you, all you have to do is define the **Margin**.
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-```xml
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-```
-The **Margin** only has the **value** attribute.
-All variables defined as 'extern' in the **Calculate** portion of the **Script** are available to the **Margin** along with all the **Property** values.
-The **Margin** can be defined with four values **`[left, top, right, bottom]`**,
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-with two values **`[horizontal, vertical]`**, which translates to **`[horizontal, vertical, horizontal, vertical]`**,
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-or with a single value **`margin`**, which translates to **`[margin, margin, margin, margin]`**.
-To see how to use **Margin**, you can checkout the example eExplode effect.
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-Fragment Shader (*.frag file)
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-multiplyRed.gre file:
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-```xml
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-```
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-multiplyRed.frag file:
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-```GLSL
-// enve uses OpenGL 3.3
-#version 330 core
-// output color
-layout(location = 0) out vec4 fragColor;
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-// processed texture coordinate, from the vertex shader
-in vec2 texCoord;
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-// texture provided by enve
-uniform sampler2D texture;
-// the value for the 'red' property
-uniform float red;
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-void main(void) {
- // texture pixel color at the coordinate
- vec4 color = texture2D(texture, texCoord);
- // assign value to the output color,
- // multiply red by the 'red' property value
- fragColor = vec4(color.r * red, color.g, color.b, color.a);
-}
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-```
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-The result:
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-If you are familiar with fragment shaders, the example above should be easy to understand.
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-Enve provides a texture **`uniform sampler2D texture;`**, values for all **Properties** with **`glValue="true"`**, and all **glValues**.
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-The type of the value passed to the fragment shader is the same, as the type of the **Property**/**glValue**:
-* float - **`uniform float exampleFlotPropVal;`**
-* int - **`uniform int exampleIntPropVal;`**
-* vec2 - **`uniform vec2 exampleVec2PropVal;`**