Nebula Embedded language

Command line interface

Fllowing command will compile program.neb source code file and write pitput to program.nebc file.

nebula program.neb -o program

Flags:

Short	Long	Scheme	Description
-o	--output	--output <file>	Output file name
	--stdout	--stdout	Output will be passed to stdout stream encoded to base64
-s	--source	--source <source code>	Source code from input string
-sb64	--source-base64	--source-base64	If set - input will be interpreted as base64 string
-in	--in	--in <statement>	Declares global input variable
-out	--out	--out <statement>	Declares global output variable

Native types

Specifier	Description
int	Integer value type
long	Long integer value type
float	Floating point value type
vec2	2 floats vector
vec3	3 floats vector
vec4	4 floats vector
mat2	2x2 float matrix
mat3	3x3 float matrix
mat4	4x4 float matrix
string	ascii string type

Example code

struct Flow1 {
    dict foo;
    spreadsheet bar;
};
inflow1 Flow1 in1;

in vec3 normal;
in float grayscale = 0.2f;// Default value is 0.2f
in int brightness;
out vec3 vertexColor;
out vec3 color;

vec3 getColor(float grayscale) {
    return vec3(grayscale, grayscale, grayscale);
}

float calculateBrightness(int inBrighness, float factor);

void main() {
    color = getColor(grayscale * 2) * vertexColor;
    if (color.x < 0) color.x = 0;
    if (color.y < 0) color.y = 0;
    if (color.z < 0) color.z = 0;
    vec3 vColorBright = vec3(
        calculateBrightness(brightness, 0.1f),
        calculateBrightness(brightness, 0.3f),
        calculateBrightness(brightness, 0.6f)
    );
    vertexColor = cross(normal, vColorBright);
}

float calculateBrightness(int inBrighness, float factor) {
    return float(inBrighness) + factor;
}