Golang C.GLfloat类(方法)实例源码

func Uniform4f(dst Uniform, v0, v1, v2, v3 float32) {
	defer func() {
		errstr := errDrain()
		log.Printf("gl.Uniform4f(%v, %v, %v, %v, %v) %v", dst, v0, v1, v2, v3, errstr)
	}()
	C.glUniform4f(dst.c(), C.GLfloat(v0), C.GLfloat(v1), C.GLfloat(v2), C.GLfloat(v3))
}

func Uniform2f(
	location int32, x float32, y float32) {
	C.glUniform2f(
		C.GLint(location),
		C.GLfloat(x),
		C.GLfloat(y))
}

//void glMap1f (GLenum target, float32 u1, float32 u2, int stride, int order, const float32 *points)
func Map1f(target GLenum, u1 float32, u2 float32, stride int, order int, points []float32) {
	if len(points) == 0 {
		panic("Invalid points size")
	}
	C.glMap1f(C.GLenum(target), C.GLfloat(u1), C.GLfloat(u2), C.GLint(stride),
		C.GLint(order), (*C.GLfloat)(&points[0]))
}

func VertexAttrib2f(
	indx uint32, x float32, y float32) {
	C.glVertexAttrib2f(
		C.GLuint(indx),
		C.GLfloat(x),
		C.GLfloat(y))
}

func PolygonOffset(factor, units float32) {
	defer func() {
		errstr := errDrain()
		log.Printf("gl.PolygonOffset(%v, %v) %v", factor, units, errstr)
	}()
	C.glPolygonOffset(C.GLfloat(factor), C.GLfloat(units))
}

func VertexAttrib4f(dst Attrib, x, y, z, w float32) {
	defer func() {
		errstr := errDrain()
		log.Printf("gl.VertexAttrib4f(%v, %v, %v, %v, %v) %v", dst, x, y, z, w, errstr)
	}()
	C.glVertexAttrib4f(dst.c(), C.GLfloat(x), C.GLfloat(y), C.GLfloat(z), C.GLfloat(w))
}

//void glMap2f (GLenum target, float32 u1, float32 u2, int ustride, int uorder, float32 v1, float32 v2, int vstride, int vorder, const float32 *points)
func Map2f(target GLenum, u1 float32, u2 float32, ustride int, uorder int, v1 float32, v2 float32, vstride int, vorder int, points []float32) {
	if len(points) == 0 {
		panic("Invalid points size")
	}
	C.glMap2f(C.GLenum(target), C.GLfloat(u1), C.GLfloat(u2), C.GLint(ustride),
		C.GLint(uorder), C.GLfloat(v1), C.GLfloat(v2), C.GLint(vstride),
		C.GLint(vorder), (*C.GLfloat)(&points[0]))
}

func Uniform4f(
	location int32, x float32, y float32, z float32, w float32) {
	C.glUniform4f(
		C.GLint(location),
		C.GLfloat(x),
		C.GLfloat(y),
		C.GLfloat(z),
		C.GLfloat(w))
}

func VertexAttrib4f(
	indx uint32, x float32, y float32, z float32, w float32) {
	C.glVertexAttrib4f(
		C.GLuint(indx),
		C.GLfloat(x),
		C.GLfloat(y),
		C.GLfloat(z),
		C.GLfloat(w))
}

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 ActualizeLight(n uint) { // n < MaxL
	//
	var L [4]float64
	L[0], L[1], L[2] = lightSource[n].Coord3()
	var l [4]C.GLfloat
	for i := 0; i < 3; i++ {
		l[i] = C.GLfloat(L[i])
	}
	l[3] = C.GLfloat(1.0)
	C.glLightfv(C.GL_LIGHT0+C.GLenum(n), C.GL_POSITION, &l[0])
	C.glLightfv(C.GL_LIGHT0+C.GLenum(n), C.GL_AMBIENT, &aa[n][0])
	C.glLightfv(C.GL_LIGHT0+C.GLenum(n), C.GL_DIFFUSE, &dd[n][0])
	C.glEnable(C.GL_LIGHT0 + C.GLenum(n))
}

// TexParameter sets texture parameters.
func TexParameter(targ TextureTarget, parm TexParam, val interface{}) {
	switch v := val.(type) {
	case float32:
		C.glTexParameterf(C.GLenum(targ), C.GLenum(parm), C.GLfloat(v))
	case float64:
		C.glTexParameterf(C.GLenum(targ), C.GLenum(parm), C.GLfloat(v))

	case int32:
		C.glTexParameteri(C.GLenum(targ), C.GLenum(parm), C.GLint(v))
	case int:
		C.glTexParameteri(C.GLenum(targ), C.GLenum(parm), C.GLint(v))
	default:
		panic("TexParameter requires either float32, float64, int32, or int")
	}
}

func TexParameterf(
	target Enum, pname Enum, param float32) {
	C.glTexParameterf(
		C.GLenum(target),
		C.GLenum(pname),
		C.GLfloat(param))
}

func VertexAttrib1f(dst Attrib, x float32) {
	defer func() {
		errstr := errDrain()
		log.Printf("gl.VertexAttrib1f(%v, %v) %v", dst, x, errstr)
	}()
	C.glVertexAttrib1f(dst.c(), C.GLfloat(x))
}

func LineWidth(width float32) {
	defer func() {
		errstr := errDrain()
		log.Printf("gl.LineWidth(%v) %v", width, errstr)
	}()
	C.glLineWidth(C.GLfloat(width))
}

func Uniform1f(dst Uniform, v float32) {
	defer func() {
		errstr := errDrain()
		log.Printf("gl.Uniform1f(%v, %v) %v", dst, v, errstr)
	}()
	C.glUniform1f(dst.c(), C.GLfloat(v))
}

func TexParameterf(target, pname Enum, param float32) {
	defer func() {
		errstr := errDrain()
		log.Printf("gl.TexParameterf(%v, %v, %v) %v", target, pname, param, errstr)
	}()
	C.glTexParameterf(target.c(), pname.c(), C.GLfloat(param))
}

func SampleCoverage(value float32, invert bool) {
	b := C.GLboolean(C.GL_FALSE)
	if invert {
		b = C.GLboolean(C.GL_TRUE)
	}

	C.glSampleCoverage(C.GLfloat(value), C.GLboolean(b))
}

// 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 init() {
	//
	right[0], front[1], top[2] = 1.0, 1.0, 1.0
	matrix[3][3] = 1.
	for l := 0; l < MaxL; l++ {
		lightSource[l] = vect.New()
	}
	w := 2.0 * math.Pi / float64(nLamp)
	sin[0], cos[0] = C.GLdouble(0.0), C.GLdouble(1.0)
	sin[nLamp], cos[nLamp] = sin[0], cos[0]
	for g := 1; g < nLamp; g++ {
		sin[g] = C.GLdouble(math.Sin(float64(g) * w))
		cos[g] = C.GLdouble(math.Cos(float64(g) * w))
	}
	sin[nLamp+1], sin[1] = cos[nLamp+1], cos[1]
	//  C.glDepthFunc (C.GL_LESS) // default
	C.glEnable(C.GL_DEPTH_TEST)
	C.glShadeModel(C.GL_SMOOTH)
	for i := 0; i < 3; i++ {
		lmAmb[i] = C.GLfloat(0.2)
	} // default: 0.2
	lmAmb[3] = C.GLfloat(1.0) // default: 1.0
	C.glLightModelfv(C.GL_LIGHT_MODEL_AMBIENT, &lmAmb[0])
	for i := 0; i < 3; i++ {
		mAmbi[i] = C.GLfloat(0.2)
	} // default: 0.2
	mAmbi[3] = C.GLfloat(1.0) // default: 1.0
	//  C.glLightModelfv (C.GL_LIGHT_MODEL_TWO_SIDE, 1)
	C.glMaterialfv(C.GL_FRONT_AND_BACK, C.GL_AMBIENT_AND_DIFFUSE, &mAmbi[0])
	for i := 0; i < 3; i++ {
		mDiff[i] = C.GLfloat(0.8)
	} // default: 0.8
	mDiff[3] = C.GLfloat(1.0) // default: 1.0
	w = 1.
	C.glClearDepth(C.GLclampd(w))
	//  C.glMaterialfv (C.GL_FRONT_AND_BACK, C.GL_DIFFUSE, mDiff)
	//  C.glColorMaterial (C.GL_FRONT_AND_BACK, C.GL_DIFFUSE)
	//  C.glColorMaterial (C.GL_FRONT, C.GL_AMBIENT)
	C.glColorMaterial(C.GL_FRONT_AND_BACK, C.GL_AMBIENT_AND_DIFFUSE)
	C.glEnable(C.GL_COLOR_MATERIAL)
	C.glEnable(C.GL_LIGHTING)
	initialize()
}