GLCOLOR(3G)

GLCOLOR 💅✨

okay bestie, this is the glColor page from the 3G manual — the OpenGL one, yes, we're being ✨graphics girlies✨ today. It's giving "set the current color" and honestly? iconic. Let's get into it 🎀

---

NAME 🌸

glColor3b, glColor3d, glColor3f, glColor3i, glColor3s, glColor3ub, glColor3ui, glColor3us, glColor4b, glColor4d, glColor4f, glColor4i, glColor4s, glColor4ub, glColor4ui, glColor4us, glColor3bv, glColor3dv, glColor3fv, glColor3iv, glColor3sv, glColor3ubv, glColor3uiv, glColor3usv, glColor4bv, glColor4dv, glColor4fv, glColor4iv, glColor4sv, glColor4ubv, glColor4uiv, glColor4usv — set the current color 💖

---

C SPECIFICATION 🦋

void glColor3b( GLbyte red,
                GLbyte green,
                GLbyte blue )
void glColor3d( GLdouble red,
                GLdouble green,
                GLdouble blue )
void glColor3f( GLfloat red,
                GLfloat green,
                GLfloat blue )
void glColor3i( GLint red,
                GLint green,
                GLint blue )
void glColor3s( GLshort red,
                GLshort green,
                GLshort blue )
void glColor3ub( GLubyte red,
                 GLubyte green,
                 GLubyte blue )
void glColor3ui( GLuint red,
                 GLuint green,
                 GLuint blue )
void glColor3us( GLushort red,
                 GLushort green,
                 GLushort blue )
void glColor4b( GLbyte red,
                GLbyte green,
                GLbyte blue,
                GLbyte alpha )
void glColor4d( GLdouble red,
                GLdouble green,
                GLdouble blue,
                GLdouble alpha )
void glColor4f( GLfloat red,
                GLfloat green,
                GLfloat blue,
                GLfloat alpha )
void glColor4i( GLint red,
                GLint green,
                GLint blue,
                GLint alpha )
void glColor4s( GLshort red,
                GLshort green,
                GLshort blue,
                GLshort alpha )
void glColor4ub( GLubyte red,
                 GLubyte green,
                 GLubyte blue,
                 GLubyte alpha )
void glColor4ui( GLuint red,
                 GLuint green,
                 GLuint blue,
                 GLuint alpha )
void glColor4us( GLushort red,
                 GLushort green,
                 GLushort blue,
                 GLushort alpha )

PARAMETERS 🍓

• red, green, blue — the new red, green, and blue values for the current color, bestie. Pick your vibe 🌈
• alpha — the new alpha value for the current color. Heads up: this one only shows up in the four-argument glColor4 commands, no cap 💅

---

C SPECIFICATION 🦋 (yes, again — the vector girlies get their own section)

void glColor3bv( const GLbyte *v )
void glColor3dv( const GLdouble *v )
void glColor3fv( const GLfloat *v )
void glColor3iv( const GLint *v )
void glColor3sv( const GLshort *v )
void glColor3ubv( const GLubyte *v )
void glColor3uiv( const GLuint *v )
void glColor3usv( const GLushort *v )
void glColor4bv( const GLbyte *v )
void glColor4dv( const GLdouble *v )
void glColor4fv( const GLfloat *v )
void glColor4iv( const GLint *v )
void glColor4sv( const GLshort *v )
void glColor4ubv( const GLubyte *v )
void glColor4uiv( const GLuint *v )
void glColor4usv( const GLushort *v )

PARAMETERS 🍓

• v — a pointer to an array that contains red, green, blue, and (sometimes 👀) alpha values.

---

DESCRIPTION 👑

So. The GL stores both a current single-valued color index and a current four-valued RGBA color. glColor sets a new four-valued RGBA color. She contains multitudes, fr fr.

glColor has two major variants: glColor3 and glColor4. Here's the tea ☕:

• glColor3 variants specify new red, green, and blue values explicitly, and set the current alpha value to 1.0 (full intensity) implicitly. Sneaky! Lowkey generous!
• glColor4 variants specify all four color components explicitly. Main character energy, no crumbs left.

glColor3b, glColor4b, glColor3s, glColor4s, glColor3i, and glColor4i take three or four signed byte, short, or long integers as arguments. And when v is appended to the name, the color commands can take a pointer to an array of such values. Slay 🫶

Current color values are stored in floating-point, with unspecified mantissa and exponent sizes. Unsigned integer color components, when specified, are linearly mapped to floating-point values such that the largest representable value maps to 1.0 (full intensity), and 0 maps to 0.0 (zero intensity). Signed integer color components, when specified, are linearly mapped to floating-point values such that the most positive representable value maps to 1.0, and the most negative representable value maps to -1.0. (Note that this mapping does not convert 0 precisely to 0.0 — yeah, she's like that 🙈.) Floating-point values are mapped directly.

⚠️ Neither floating-point nor signed integer values are clamped to the range [0,1] before the current color is updated. However — and this is the important part — color components are clamped to this range before they are interpolated or written into a color buffer. So it's giving chaos but contained chaos 💀

---

NOTES ⭐

• The initial value for the current color is (1, 1, 1, 1). That's your starting fit 💖
• The current color can be updated at any time. In particular, glColor can be called between a call to glBegin and the corresponding call to glEnd. Flexibility queen 👑

---

ASSOCIATED GETS 🧚

• glGet with argument GL_CURRENT_COLOR
• glGet with argument GL_RGBA_MODE

---

SEE ALSO 🌈

• glIndex(3G)

---

and that's the whole page, bestie!! 🎀 This was GLCOLOR(3G), straight out of the 3G manual — mwah, take care of her, she's an icon 👑💅✨