// SetUniform sets a uniform variable using the appropriate glUniform* or glUniformMatrix* call. It supports arrays of float32 and float64 or Mat4 objects.
// NB: The underlying API does not support double precision, being able to pass float64 values is for convenience only.
// BUG: It does not support non-square matrices.
func (p *Program) SetUniform(loc string, data interface{}) {
uni := p.uni[loc]
switch f := data.(type) {
case float32:
C.glUniform1f(uni, C.GLfloat(f))
case [1]float32:
C.glUniform1f(uni, C.GLfloat(f[0]))
case [2]float32:
C.glUniform2f(uni, C.GLfloat(f[0]), C.GLfloat(f[1]))
case [3]float32:
C.glUniform3f(uni, C.GLfloat(f[0]), C.GLfloat(f[1]), C.GLfloat(f[2]))
case [4]float32:
C.glUniform4f(uni, C.GLfloat(f[0]), C.GLfloat(f[1]), C.GLfloat(f[2]), C.GLfloat(f[3]))
case float64:
C.glUniform1f(uni, C.GLfloat(f))
case [1]float64:
C.glUniform1f(uni, C.GLfloat(f[0]))
case [2]float64:
C.glUniform2f(uni, C.GLfloat(f[0]), C.GLfloat(f[1]))
case [3]float64:
C.glUniform3f(uni, C.GLfloat(f[0]), C.GLfloat(f[1]), C.GLfloat(f[2]))
case [4]float64:
C.glUniform4f(uni, C.GLfloat(f[0]), C.GLfloat(f[1]), C.GLfloat(f[2]), C.GLfloat(f[3]))
case int:
C.glUniform1i(uni, C.GLint(f))
case [1]int:
C.glUniform1i(uni, C.GLint(f[0]))
case [2]int:
C.glUniform2i(uni, C.GLint(f[0]), C.GLint(f[1]))
case [3]int:
C.glUniform3i(uni, C.GLint(f[0]), C.GLint(f[1]), C.GLint(f[2]))
case [4]int:
C.glUniform4i(uni, C.GLint(f[0]), C.GLint(f[1]), C.GLint(f[2]), C.GLint(f[3]))
case [2][2]float32:
g := [4]C.GLfloat{C.GLfloat(f[0][0]), C.GLfloat(f[1][0]), C.GLfloat(f[0][1]), C.GLfloat(f[1][1])}
C.glUniformMatrix2fv(uni, 1, FALSE, &g[0])
case [2][2]float64:
g := [4]C.GLfloat{C.GLfloat(f[0][0]), C.GLfloat(f[1][0]), C.GLfloat(f[0][1]), C.GLfloat(f[1][1])}
C.glUniformMatrix2fv(uni, 1, FALSE, &g[0])
case [3][3]float32:
g := [9]C.GLfloat{C.GLfloat(f[0][0]), C.GLfloat(f[1][0]), C.GLfloat(f[2][0]), C.GLfloat(f[0][1]), C.GLfloat(f[1][1]), C.GLfloat(f[2][1]), C.GLfloat(f[0][2]), C.GLfloat(f[1][2]), C.GLfloat(f[2][2])}
C.glUniformMatrix3fv(uni, 1, FALSE, &g[0])
case [3][3]float64:
g := [9]C.GLfloat{C.GLfloat(f[0][0]), C.GLfloat(f[1][0]), C.GLfloat(f[2][0]), C.GLfloat(f[0][1]), C.GLfloat(f[1][1]), C.GLfloat(f[2][1]), C.GLfloat(f[0][2]), C.GLfloat(f[1][2]), C.GLfloat(f[2][2])}
C.glUniformMatrix3fv(uni, 1, FALSE, &g[0])
case [4][4]float32:
g := [16]C.GLfloat{C.GLfloat(f[0][0]), C.GLfloat(f[1][0]), C.GLfloat(f[2][0]), C.GLfloat(f[3][0]), C.GLfloat(f[0][1]), C.GLfloat(f[1][1]), C.GLfloat(f[2][1]), C.GLfloat(f[3][1]), C.GLfloat(f[0][2]), C.GLfloat(f[1][2]), C.GLfloat(f[2][2]), C.GLfloat(f[3][2]), C.GLfloat(f[0][3]), C.GLfloat(f[1][3]), C.GLfloat(f[2][3]), C.GLfloat(f[3][3])}
C.glUniformMatrix4fv(uni, 1, FALSE, &g[0])
case [4][4]float64:
g := [16]C.GLfloat{C.GLfloat(f[0][0]), C.GLfloat(f[1][0]), C.GLfloat(f[2][0]), C.GLfloat(f[3][0]), C.GLfloat(f[0][1]), C.GLfloat(f[1][1]), C.GLfloat(f[2][1]), C.GLfloat(f[3][1]), C.GLfloat(f[0][2]), C.GLfloat(f[1][2]), C.GLfloat(f[2][2]), C.GLfloat(f[3][2]), C.GLfloat(f[0][3]), C.GLfloat(f[1][3]), C.GLfloat(f[2][3]), C.GLfloat(f[3][3])}
C.glUniformMatrix4fv(uni, 1, FALSE, &g[0])
case Mat4:
g := [16]C.GLfloat{C.GLfloat(f[0][0]), C.GLfloat(f[1][0]), C.GLfloat(f[2][0]), C.GLfloat(f[3][0]), C.GLfloat(f[0][1]), C.GLfloat(f[1][1]), C.GLfloat(f[2][1]), C.GLfloat(f[3][1]), C.GLfloat(f[0][2]), C.GLfloat(f[1][2]), C.GLfloat(f[2][2]), C.GLfloat(f[3][2]), C.GLfloat(f[0][3]), C.GLfloat(f[1][3]), C.GLfloat(f[2][3]), C.GLfloat(f[3][3])}
C.glUniformMatrix4fv(uni, 1, FALSE, &g[0])
default:
panic("invalid type passed to SetUniform()")
}
}
func Uniform2f(
location int32, x float32, y float32) {
C.glUniform2f(
C.GLint(location),
C.GLfloat(x),
C.GLfloat(y))
}
func Uniform2f(dst Uniform, v0, v1 float32) {
defer func() {
errstr := errDrain()
log.Printf("gl.Uniform2f(%v, %v, %v) %v", dst, v0, v1, errstr)
}()
C.glUniform2f(dst.c(), C.GLfloat(v0), C.GLfloat(v1))
}
// Uniform specifies the value of a uniform variable for the current program object.
func (u Uniform) Uniform(vls ...interface{}) {
if len(vls) == 0 || len(vls) > 4 {
panic("Uniform requires 1, 2, 3, or 4 values")
}
switch vls[0].(type) {
case float32:
switch len(vls) {
case 1:
C.glUniform1f(C.GLint(u), C.GLfloat(vls[0].(float32)))
case 2:
C.glUniform2f(C.GLint(u), C.GLfloat(vls[0].(float32)), C.GLfloat(vls[1].(float32)))
case 3:
C.glUniform3f(C.GLint(u), C.GLfloat(vls[0].(float32)), C.GLfloat(vls[1].(float32)), C.GLfloat(vls[2].(float32)))
case 4:
C.glUniform4f(C.GLint(u), C.GLfloat(vls[0].(float32)), C.GLfloat(vls[1].(float32)), C.GLfloat(vls[2].(float32)), C.GLfloat(vls[3].(float32)))
}
case int:
switch len(vls) {
case 1:
C.glUniform1i(C.GLint(u), C.GLint(vls[0].(int)))
case 2:
C.glUniform2i(C.GLint(u), C.GLint(vls[0].(int)), C.GLint(vls[1].(int)))
case 3:
C.glUniform3i(C.GLint(u), C.GLint(vls[0].(int)), C.GLint(vls[1].(int)), C.GLint(vls[2].(int)))
case 4:
C.glUniform4i(C.GLint(u), C.GLint(vls[0].(int)), C.GLint(vls[1].(int)), C.GLint(vls[2].(int)), C.GLint(vls[3].(int)))
}
default:
panic("Uniform only accepts int and float32 typed parameters")
}
}
func (game *game) drawFrame() {
time += .05
color := (C.GLclampf(math.Sin(time)) + 1) * .5
C.glUniform2f(C.GLint(game.offsetUni), C.GLfloat(game.offsetX), C.GLfloat(game.offsetY))
C.glUniform3f(C.GLint(game.colorUni), 1.0, C.GLfloat(color), 0)
C.glClear(C.GL_COLOR_BUFFER_BIT | C.GL_DEPTH_BUFFER_BIT)
C.glUseProgram(game.prog)
C.glDrawArrays(C.GL_TRIANGLES, 0, 3)
}
func Uniform2f(dst Uniform, v0, v1 float32) {
C.glUniform2f(dst.c(), C.GLfloat(v0), C.GLfloat(v1))
}
func (location UniformLocation) Uniform2f(x float32, y float32) {
C.glUniform2f(C.GLint(location), C.GLfloat(x), C.GLfloat(y))
}
func (u Uniform2f) Set(x, y float32) {
C.glUniform2f(u.location, C.GLfloat(x), C.GLfloat(y))
}