summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--app.go7
-rw-r--r--geometry.go5
-rw-r--r--graphics.go71
-rw-r--r--main.go6
-rw-r--r--stl.go52
5 files changed, 89 insertions, 52 deletions
diff --git a/app.go b/app.go
index 30dfd44..b124f4c 100644
--- a/app.go
+++ b/app.go
@@ -41,7 +41,8 @@ func newApp(stl *StlModel) App {
glfw.WindowHint(glfw.Samples, 16) // anti-aliasing
log.Println("Creating Window")
- app.window, err = glfw.CreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT, WINDOW_TITLE, nil, nil)
+ app.window, err = glfw.CreateWindow(WINDOW_WIDTH, WINDOW_HEIGHT,
+ WINDOW_TITLE, nil, nil)
if err != nil {
panic(err)
}
@@ -58,7 +59,9 @@ func (application *App) handle() {
// generate and set transformation
trafo := application.homeTrafo
- trafo = mgl32.HomogRotate3D(float32(glfw.GetTime()) * 0.4 * 6.282, mgl32.Vec3{0.1, 1, 0}).Mul4(trafo) // apply time-based rotation
+ trafo = mgl32.HomogRotate3D(
+ float32(glfw.GetTime()) * 0.4 * 6.282,
+ mgl32.Vec3{0.1, 1, 0}).Mul4(trafo) // apply time-based rotation
application.graphics.setTrafo(trafo)
}
diff --git a/geometry.go b/geometry.go
index 1fc516a..80420a6 100644
--- a/geometry.go
+++ b/geometry.go
@@ -58,7 +58,10 @@ func (s Surface) getHomeView() mgl32.Mat4 {
// calculate and return transformation
var trafo mgl32.Mat4 = mgl32.Ident4()
- trafo = mgl32.Translate3D(-center.scalars[0], -center.scalars[1], -center.scalars[2]).Mul4(trafo)
+ trafo = mgl32.Translate3D(
+ -center.scalars[0],
+ -center.scalars[1],
+ -center.scalars[2]).Mul4(trafo)
trafo = mgl32.Scale3D(zoom, zoom, zoom).Mul4(trafo)
return trafo
diff --git a/graphics.go b/graphics.go
index fc195eb..a952e40 100644
--- a/graphics.go
+++ b/graphics.go
@@ -20,37 +20,43 @@ const (
// vertex shader to draw points
VERTEX_SHADER = `
- #version 410
+#version 410
- in vec3 vp_model; // vertex position in model coordinate system
- in vec3 vn_model; // vertex normal in model coordinate system
+in vec3 vp_model; // vertex position in model coordinate system
+in vec3 vn_model; // vertex normal in model coordinate system
- uniform mat4 trafo; // one single transformation matrix
+uniform mat4 trafo; // one single transformation matrix
- out vec3 vn_eye; // vertex normal in eye coordinate system
+out vec3 vn_eye; // vertex normal in eye coordinate system
- void main() {
- vn_eye = vec3(trafo * vec4(vn_model, 0.0)); // 0.0 because translation is ignored
- gl_Position = trafo * vec4(vp_model, 1.0);
- }
- ` + "\x00"
+void main() {
+
+ // 0.0 because translation is ignored
+ vn_eye = vec3(trafo * vec4(vn_model, 0.0));
+
+ gl_Position = trafo * vec4(vp_model, 1.0);
+
+}
+ ` + "\x00"
// fragment shader to draw surfaces
FRAGMENT_SHADER = `
- #version 410
+#version 410
- in vec3 vn_eye; // vertex normal in eye coordinate system
+in vec3 vn_eye; // vertex normal in eye coordinate system
- out vec4 frag_colour;
+out vec4 frag_colour;
- void main() {
- vec3 ambient = vec3(0.3, 0.3, 0.3); // ambient colour is static
- vec3 light_vector_eye = vec3(1.0, 0.1, -1.0);
- vec3 diffuse = (vec3(1, 1, 1) - ambient) * max(dot(normalize(vn_eye), normalize(light_vector_eye)), 0.0);
- vec3 color = (ambient + diffuse) * vec3(0, 0, 1); // hard-coded vector is color in RGB format
- frag_colour = vec4(color, 1.0); // RGBA color format
- }
- ` + "\x00"
+void main() {
+ vec3 ambient = vec3(0.3, 0.3, 0.3); // ambient colour is static
+ vec3 light_vector_eye = vec3(1.0, 0.1, -1.0);
+ vec3 diffuse = (vec3(1, 1, 1) - ambient) * max(dot(normalize(vn_eye),
+ normalize(light_vector_eye)), 0.0);
+ // hard-coded vector is color in RGB format:
+ vec3 color = (ambient + diffuse) * vec3(0, 0, 1);
+ frag_colour = vec4(color, 1.0); // RGBA color format
+}
+ ` + "\x00"
)
type Graphics struct {
@@ -83,7 +89,8 @@ func newGraphics() Graphics {
if err != nil {
log.Fatal(err)
}
- graphics.fragmentShader, err = compileShader(FRAGMENT_SHADER, gl.FRAGMENT_SHADER)
+ graphics.fragmentShader, err = compileShader(FRAGMENT_SHADER,
+ gl.FRAGMENT_SHADER)
if err != nil {
log.Fatal(err)
}
@@ -99,8 +106,6 @@ func newGraphics() Graphics {
graphics.vao = makeVao(vertices, vertex_normals)
// create transformation matrix
- //graphics.trafo = mgl32.HomogRotate3D(float32(glfw.GetTime()) * OMEGA, mgl32.Vec3{ROT_X, ROT_Y, ROT_Z})
- //graphics.trafoUniform = gl.GetUniformLocation(graphics.program, gl.Str("trafo\x00"))
gl.UniformMatrix4fv(graphics.trafoUniform, 1, false, &graphics.trafo[0])
return graphics
@@ -110,11 +115,13 @@ func (graphics Graphics) draw() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.UseProgram(graphics.program)
- //graphics.trafo = mgl32.HomogRotate3D(float32(glfw.GetTime()) * OMEGA, mgl32.Vec3{ROT_X, ROT_Y, ROT_Z})
gl.UniformMatrix4fv(graphics.trafoUniform, 1, false, &graphics.trafo[0])
gl.BindVertexArray(graphics.vao)
- gl.DrawArrays(gl.TRIANGLES, 0, int32(len(vertices)/3)) // POINTS, LINES, LINE_STRIP, LINE_LOOP, TRIANGLES, TRIANGLE_STRIP, TRIANGLE_FAN
+
+ // or alternatively POINTS, LINES, LINE_STRIP, LINE_LOOP, TRIANGLES,
+ // TRIANGLE_STRIP, TRIANGLE_FAN
+ gl.DrawArrays(gl.TRIANGLES, 0, int32(len(vertices)/3))
}
// makeVao initializes and returns a vertex array from the points provided.
@@ -125,13 +132,15 @@ func makeVao(points []float32, normals []float32) uint32 {
var position_vbo uint32 // VBO ID
gl.GenBuffers(1, &position_vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, position_vbo)
- gl.BufferData(gl.ARRAY_BUFFER, 4*len(points), gl.Ptr(points), gl.STATIC_DRAW)
+ gl.BufferData(gl.ARRAY_BUFFER, 4*len(points), gl.Ptr(points),
+ gl.STATIC_DRAW)
// vertex buffer object (VBO) for normals:
var normal_vbo uint32 // VBO ID
gl.GenBuffers(1, &normal_vbo)
gl.BindBuffer(gl.ARRAY_BUFFER, normal_vbo)
- gl.BufferData(gl.ARRAY_BUFFER, 4*len(normals), gl.Ptr(normals), gl.STATIC_DRAW)
+ gl.BufferData(gl.ARRAY_BUFFER, 4*len(normals), gl.Ptr(normals),
+ gl.STATIC_DRAW)
// vertex array objects (VAO) to combine VBOs:
var vao uint32 // VAO ID
@@ -140,12 +149,14 @@ func makeVao(points []float32, normals []float32) uint32 {
// connect position_vbo to vao
gl.BindBuffer(gl.ARRAY_BUFFER, position_vbo)
- gl.VertexAttribPointer(0, 3, gl.FLOAT, false, 0, nil) // tell GL to use 3D float vectors
+ // tell GL to use 3D float vectors:
+ gl.VertexAttribPointer(0, 3, gl.FLOAT, false, 0, nil)
gl.EnableVertexAttribArray(0)
// connect normal_vbo to vao
gl.BindBuffer(gl.ARRAY_BUFFER, normal_vbo)
- gl.VertexAttribPointer(1, 3, gl.FLOAT, false, 0, nil) // tell GL to use 3D float vectors
+ // tell GL to use 3D float vectors:
+ gl.VertexAttribPointer(1, 3, gl.FLOAT, false, 0, nil)
gl.EnableVertexAttribArray(1)
return vao
diff --git a/main.go b/main.go
index 084b8ec..9c45241 100644
--- a/main.go
+++ b/main.go
@@ -30,7 +30,8 @@ func main() {
}
vertices,vertex_normals = stl.toVertices()
- // lock this program to one OS thread (details: https://golang.org/pkg/runtime/#LockOSThread)
+ // lock this program to one OS thread
+ // (details: https://golang.org/pkg/runtime/#LockOSThread)
log.Println("Locking OS thread")
runtime.LockOSThread()
@@ -50,7 +51,8 @@ func main() {
}
func (args *cliArgs) read() {
- flag.BoolVar(&args.debugOutput, "debug", false, "enable to print log output")
+ flag.BoolVar(&args.debugOutput, "debug", false,
+ "enable to print log output")
flag.Parse()
args.filePath = flag.Arg(0)
}
diff --git a/stl.go b/stl.go
index 60ada3e..851a003 100644
--- a/stl.go
+++ b/stl.go
@@ -50,8 +50,11 @@ func ReadBinaryStlFile(filePath string) (StlModel, error) {
return model,nil
}
-// parse the 50 bytes of the STL file representing a triangle (surface normal is ignored)
-func ParseBinaryStlTriangle(data []byte) *Triangle { // FIXME: This function should only accept 50 byte slices/arrays
+// parse the 50 bytes of the STL file representing a triangle (surface normal
+// is ignored)
+func ParseBinaryStlTriangle(data []byte) *Triangle {
+
+ // FIXME: This function should only accept 50 byte slices/arrays
// allocate a new triangle and three corner points on the heap
triangle := new(Triangle)
@@ -60,24 +63,34 @@ func ParseBinaryStlTriangle(data []byte) *Triangle { // FIXME: This function sh
triangle.points[2] = new(Point)
// parse x, y and z coordinate for corner point a
- triangle.points[0].scalars[0] = math.Float32frombits(binary.LittleEndian.Uint32(data[12:16]))
- triangle.points[0].scalars[1] = math.Float32frombits(binary.LittleEndian.Uint32(data[16:20]))
- triangle.points[0].scalars[2] = math.Float32frombits(binary.LittleEndian.Uint32(data[20:24]))
+ triangle.points[0].scalars[0] = math.Float32frombits(
+ binary.LittleEndian.Uint32(data[12:16]))
+ triangle.points[0].scalars[1] = math.Float32frombits(
+ binary.LittleEndian.Uint32(data[16:20]))
+ triangle.points[0].scalars[2] = math.Float32frombits(
+ binary.LittleEndian.Uint32(data[20:24]))
// parse x, y and z coordinate for corner point b
- triangle.points[1].scalars[0] = math.Float32frombits(binary.LittleEndian.Uint32(data[24:28]))
- triangle.points[1].scalars[1] = math.Float32frombits(binary.LittleEndian.Uint32(data[28:32]))
- triangle.points[1].scalars[2] = math.Float32frombits(binary.LittleEndian.Uint32(data[32:36]))
+ triangle.points[1].scalars[0] = math.Float32frombits(
+ binary.LittleEndian.Uint32(data[24:28]))
+ triangle.points[1].scalars[1] = math.Float32frombits(
+ binary.LittleEndian.Uint32(data[28:32]))
+ triangle.points[1].scalars[2] = math.Float32frombits(
+ binary.LittleEndian.Uint32(data[32:36]))
// parse x, y and z coordinate for corner point c
- triangle.points[2].scalars[0] = math.Float32frombits(binary.LittleEndian.Uint32(data[36:40]))
- triangle.points[2].scalars[1] = math.Float32frombits(binary.LittleEndian.Uint32(data[40:44]))
- triangle.points[2].scalars[2] = math.Float32frombits(binary.LittleEndian.Uint32(data[44:48]))
+ triangle.points[2].scalars[0] = math.Float32frombits(
+ binary.LittleEndian.Uint32(data[36:40]))
+ triangle.points[2].scalars[1] = math.Float32frombits(
+ binary.LittleEndian.Uint32(data[40:44]))
+ triangle.points[2].scalars[2] = math.Float32frombits(
+ binary.LittleEndian.Uint32(data[44:48]))
return triangle
}
-func (stl StlModel) toVertices() (vertex_position []float32, vertex_normal []float32) {
+func (stl StlModel) toVertices() (vertex_position []float32,
+ vertex_normal []float32) {
vertex_position = make([]float32, stl.numberOfTriangles * 9)
vertex_normal = make([]float32, stl.numberOfTriangles * 9)
@@ -90,20 +103,25 @@ func (stl StlModel) toVertices() (vertex_position []float32, vertex_normal []flo
for scalarIndex,scalar := range(point.scalars) {
- vertex_position[triangleIndex*9+pointIndex*3+scalarIndex] = scalar
+ i := triangleIndex * 9 + pointIndex * 3 + scalarIndex
+ vertex_position[i] = scalar
}
}
// calculate normal
- point0 = Vector3{triangle.points[0].scalars[0], triangle.points[0].scalars[1], triangle.points[0].scalars[2]}
- point1 = Vector3{triangle.points[1].scalars[0], triangle.points[1].scalars[1], triangle.points[1].scalars[2]}
- point2 = Vector3{triangle.points[2].scalars[0], triangle.points[2].scalars[1], triangle.points[2].scalars[2]}
+ point0 = Vector3{triangle.points[0].scalars[0],
+ triangle.points[0].scalars[1], triangle.points[0].scalars[2]}
+ point1 = Vector3{triangle.points[1].scalars[0],
+ triangle.points[1].scalars[1], triangle.points[1].scalars[2]}
+ point2 = Vector3{triangle.points[2].scalars[0],
+ triangle.points[2].scalars[1], triangle.points[2].scalars[2]}
edge0 = point1.subtract(point0)
edge1 = point2.subtract(point1)
normal = edge0.crossProduct(edge1)
- normal.divideScalar(2.0) // length of normal vector corresponds to triangle area
+ normal.divideScalar(2.0) // length of normal vector corresponds to
+ // triangle area
// save normal to each vertex of the triangle
for i := 0; i<3; i++ {
generated by cgit v1.2.3-70-g09d2 (git 2.51.0) at 2025-10-31 05:57:29 +0000