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import
chipmunk,
sdl2,
sdl2 / [
gfx,
ttf,
image
],
opengl,
opengl/glu,
math,
random,
strutils
const
DRAW_WITH_OPENGL* = true
INFINITY* = 1e1000
TWICE_PI* = 2.0f * math.PI
WINDOW_SIZE* = (width: 800.0, height: 600.0)
DRAW_OFFSET* = (x: WINDOW_SIZE.width/2, y: WINDOW_SIZE.height/2)
SDL_WHITE* = (r:255.uint8,g:255.uint8,b:255.uint8,a:255.uint8)
SDL_BACKGROUND_COLOR = (
r:64.uint8, g:64.uint8, b:64.uint8, a:255.uint8
)
CHIPMUNK_WHITE* = chipmunk.SpaceDebugColor(
r:1.0, g:1.0, b:1.0, a:1.0
)
CHIPMUNK_RED* = chipmunk.SpaceDebugColor(
r:1.0, g:0.0, b:0.0, a:1.0
)
CHIPMUNK_BLUE* = chipmunk.SpaceDebugColor(
r:0.0, g:0.0, b:1.0, a:1.0
)
CHIPMUNK_GREEN* = chipmunk.SpaceDebugColor(
r:0.0, g:1.0, b:0.0, a:1.0
)
CHIPMUNK_GREY* = chipmunk.SpaceDebugColor(
r:0.70, g:0.70, b:0.70, a:1.0
)
CHIPMUNK_DARK_GREY* = chipmunk.SpaceDebugColor(
r:0.40, g:0.40, b:0.40, a:1.0
)
CHIPMUNK_BLACK* = chipmunk.SpaceDebugColor(
r:0.0, g:0.0, b:0.0, a:1.0
)
DOT_COLOR* = chipmunk.SpaceDebugColor(
r:1.0, g:1.0, b:1.0, a:1.0
)
BACKGROUND_COLOR = chipmunk.SpaceDebugColor(
r:0.25, g:0.25, b:0.25, a:1.0
)
SHAPE_OUTLINE_COLOR = chipmunk.SpaceDebugColor(
r: 200.0/255.0,
g: 210.0/255.0,
b: 230.0/255.0,
a: 1.0
)
CONSTRAINT_COLOR = chipmunk.SpaceDebugColor(r:0.0, g:0.75, b:0.0, a:1.0)
COLLISION_POINT_COLOR = chipmunk.SpaceDebugColor(r:1.0, g:0.0, b:0.0, a:1.0)
FONT_SIZE* = 14.0
RAND_MAX* = high(int)
FLOAT_MAX* = float(RAND_MAX)
GRABBABLE_MASK_BIT* = cuint(1 shl 31)
CP_ALL_CATEGORIES* = chipmunk.Bitmask(0)
# CP_NO_GROUP* = cast[Group](0)
CP_NO_GROUP* = Group(nil)
GRAB_FILTER* = ShapeFilter(
group: CP_NO_GROUP,
categories: GRABBABLE_MASK_BIT,
mask: GRABBABLE_MASK_BIT
)
NOT_GRABBABLE_FILTER* = ShapeFilter(
group: CP_NO_GROUP,
categories: not GRABBABLE_MASK_BIT,
mask: not GRABBABLE_MASK_BIT
)
DEMO_TEXT_X_OFFSET* = 10.0
DEMO_TEXT_Y_OFFSET_LINE_0* = data.WINDOW_SIZE.height - 3*data.FONT_SIZE - 10.0
DEMO_TEXT_Y_OFFSET_LINE_1* = data.WINDOW_SIZE.height - 2*data.FONT_SIZE - 10.0
DEMO_TEXT_Y_OFFSET_LINE_2* = data.WINDOW_SIZE.height - data.FONT_SIZE - 10.0
var
main_window*: sdl2.WindowPtr
main_renderer*: sdl2.RendererPtr
context: GlContextPtr
version: cstring
font: ttf.FontPtr
keyboard_vector*: chipmunk.Vect
when DRAW_WITH_OPENGL == true:
var
nim_logo_surface*: sdl2.SurfacePtr
nim_logo_rectangle* = (
x: cint(725), y: cint(455), w: cint(70), h: cint(30)
)
chipmunk_logo_surface*: sdl2.SurfacePtr
chipmunk_logo_rectangle* = (
x: cint(725), y: cint(490), w: cint(73), h: cint(35)
)
sdl_logo_surface*: sdl2.SurfacePtr
sdl_logo_rectangle* = (
x: cint(730), y: cint(525), w: cint(60), h: cint(30)
)
opengl_logo_surface*: sdl2.SurfacePtr
opengl_logo_rectangle* = (
x: cint(730), y: cint(560), w: cint(60), h: cint(30)
)
else:
var
nim_logo_texture*: sdl2.TexturePtr
nim_logo_rectangle* = (
x: cint(725), y: cint(455), w: cint(70), h: cint(30)
)
chipmunk_logo_texture*: sdl2.TexturePtr
chipmunk_logo_rectangle* = (
x: cint(725), y: cint(490), w: cint(73), h: cint(35)
)
sdl_logo_texture*: sdl2.TexturePtr
sdl_logo_rectangle* = (
x: cint(730), y: cint(525), w: cint(60), h: cint(30)
)
opengl_logo_texture*: sdl2.TexturePtr
opengl_logo_rectangle* = (
x: cint(730), y: cint(560), w: cint(60), h: cint(30)
)
## Helper procedures, converters, ...
converter sdl2_to_cp_color(in_color: sdl2.Color): chipmunk.SpaceDebugColor =
result.r = GLfloat(in_color.r) / 255.0
result.g = GLfloat(in_color.g) / 255.0
result.b = GLfloat(in_color.b) / 255.0
result.a = GLfloat(in_color.a) / 255.0
converter cp_to_sdl2_color(in_color: chipmunk.SpaceDebugColor): sdl2.Color =
result.r = uint8(in_color.r * 255)
result.g = uint8(in_color.g * 255)
result.b = uint8(in_color.b * 255)
result.a = uint8(in_color.a * 255)
proc frand*(): Float {.inline.} =
result = chipmunk.Float(
random.rand(float(high(int))) / chipmunk.Float(high(int))
)
proc frand_unit_circle*(): chipmunk.Vect {.inline.} =
var v: chipmunk.Vect = v(frand() * 2.0 - 1.0, frand() * 2.0 - 1.0)
result = if vlengthsq(v) < 1.0:
v
else:
frand_unit_circle()
proc set_random_color*(shape: chipmunk.Shape) {.inline.} =
shape.userData = cast[chipmunk.DataPointer](
alloc0(sizeof(chipmunk.SpaceDebugColor))
)
var color = cast[ptr chipmunk.SpaceDebugColor](shape.userData)
color[] = chipmunk.SpaceDebugColor(
r: random.rand(1.0),
g: random.rand(1.0),
b: random.rand(1.0),
a: 1.0
)
proc set_color*(shape: chipmunk.Shape, in_color: chipmunk.SpaceDebugColor) {.inline.} =
shape.userData = cast[chipmunk.DataPointer](
alloc0(sizeof(chipmunk.SpaceDebugColor))
)
var color = cast[ptr chipmunk.SpaceDebugColor](shape.userData)
color[] = chipmunk.SpaceDebugColor(
r: in_color.r,
g: in_color.g,
b: in_color.b,
a: in_color.a,
)
## Chipmunk clean up routines
proc shape_free_wrap(space: chipmunk.Space,
shape: chipmunk.Shape,
unused: pointer) {.cdecl.} =
space.removeShape(shape)
shape.destroy()
proc post_shape_free(shape: chipmunk.Shape, space: chipmunk.Space) {.cdecl.} =
discard space.addPostStepCallback(
cast[PostStepFunc](shape_free_wrap),
shape,
nil
)
proc constraint_free_wrap(space: chipmunk.Space,
constraint: Constraint,
unused: pointer) {.cdecl.} =
space.removeConstraint(constraint)
constraint.destroy()
proc post_constraint_free(constraint: Constraint,
space: chipmunk.Space) {.cdecl.} =
discard space.addPostStepCallback(
cast[PostStepFunc](constraint_free_wrap),
constraint,
nil
)
proc body_free_wrap(space: chipmunk.Space,
body: chipmunk.Body,
unused: pointer) {.cdecl.} =
space.removeBody(body)
body.destroy()
proc post_body_free(body: chipmunk.Body, space: chipmunk.Space) {.cdecl.} =
discard space.addPostStepCallback(
cast[PostStepFunc](body_free_wrap),
body,
nil
)
proc clean_up_children*(space: chipmunk.Space) =
space.eachShape(
cast[SpaceShapeIteratorFunc](post_shape_free),
space
)
space.eachConstraint(
cast[SpaceConstraintIteratorFunc](post_constraint_free),
space
)
space.eachBody(
cast[SpaceBodyIteratorFunc](post_body_free),
space
)
proc clean_up_shape_color*(shape: Shape; data: pointer) {.cdecl.} =
if shape.userData != nil:
dealloc(shape.userData)
shape.userData = nil
proc get_arc_points(cx, cy, r, start_angle, arc_angle :GLfloat,
num_segments: int): seq[chipmunk.Vect] {.inline.} =
var
# Theta is now calculated from the arc angle instead,
# the - 1 bit comes from the fact that the arc is open
theta = arc_angle / float(num_segments - 1)
tangetial_factor = math.tan(theta)
radial_factor = math.cos(theta)
# We now start at the start angle
x = r * math.cos(start_angle)
y = r * math.sin(start_angle)
result = newSeq[chipmunk.Vect](num_segments)
# Since the arc is not a closed curve, this is a strip now
for i in 0..num_segments-1:
result[i] = chipmunk.Vect(
x: x + cx,
y: y + cy
)
var
tx = -y
ty = x
x += tx * tangetial_factor
y += ty * tangetial_factor
x *= radial_factor
y *= radial_factor
## Text drawing procedures
proc init_font*() =
if ttf.ttfInit() != sdl2.SdlSuccess:
quit("An error occured while initializing ttf font!")
font = openFont("EffectsEighty.otf", 18)
if font == nil:
quit("An error occured while opening ttf font file!")
proc clean_up_font*() =
close(font)
proc text_to_texture(text: string,
text_color: sdl2.Color=SDL_WHITE): sdl2.TexturePtr =
## Create texture from a TrueType font
var text_surface: sdl2.SurfacePtr
text_surface = ttf.renderUtf8Blended(font, text, text_color)
if text_surface == nil:
quit("Error creating text surface: '" & text & "'")
# Create the new texture
result = sdl2.createTextureFromSurface(
main_renderer,
text_surface
)
if result == nil:
quit("Error creating text texture: '" & text & "'")
# Free the surface from memory,
# it's a memory leak if this operation is skipped
sdl2.freeSurface(text_surface)
proc draw_text_sdl(text: string, position: chipmunk.Vect) =
var
text_texture: sdl2.TexturePtr = text_to_texture(text)
rectangle: sdl2.Rect
geometry: tuple[width, height: cint]
# Get the text texture size and create a SDL rectangle with it
sdl2.queryTexture(
text_texture,
nil,
nil,
addr(geometry.width),
addr(geometry.height)
)
rectangle = (
x: cint(position.x),
y: cint(position.y),
w: cint(geometry.width),
h: cint(geometry.height)
)
# Copy the texture to the renderer
main_renderer.copyEx(
text_texture,
nil,
addr(rectangle),
0.cdouble,
nil,
0
)
# Clean up the temporary texture
destroy(text_texture)
## SDL procedures
proc file_to_surface(image_file: string): sdl2.SurfacePtr =
## Load image surface from a file
if image_file.toLowerAscii().endsWith(".png"):
result = image.load(image_file)
elif image_file.toLowerAscii().endsWith(".bmp"):
result = sdl2.loadBMP(image_file)
else:
quit "'" & image_file & "' is in a unsupported format!"
if result == nil:
quit("Error loading image: '" & $image_file & "'")
proc surface_to_texture(in_surface: sdl2.SurfacePtr): sdl2.TexturePtr =
## Convert a SDL surface to a SDL texture
if in_surface == nil:
quit("Input surface cannot be nil!")
# Create the new texture
result = sdl2.createTextureFromSurface(
main_renderer,
in_surface
)
if result == nil:
quit("Error creating image texture from a surface")
# Free the surface from memory,
# it's a memory leak if this operation is skipped
sdl2.freeSurface(in_surface)
proc resize_surface(in_surface: sdl2.SurfacePtr,
new_width, new_height: int): sdl2.SurfacePtr =
var
width_factor: cdouble = new_width / in_surface.w
height_factor: cdouble = new_height / in_surface.h
result = rotozoomSurfaceXY(
in_surface,
0,
width_factor,
height_factor,
cint(1)
)
proc render_texture*(texture: sdl2.TexturePtr, rectangle: var sdl2.Rect) =
##Copy the texture to the renderer
main_renderer.copy(texture, nil, addr(rectangle))
proc init_sdl*() =
sdl2.init(INIT_EVERYTHING)
# Window
main_window = sdl2.createWindow(
"Nim-Chipmunk demo samples",
sdl2.SDL_WINDOWPOS_CENTERED,
sdl2.SDL_WINDOWPOS_CENTERED,
cint(WINDOW_SIZE.width),
cint(WINDOW_SIZE.height),
SDL_WINDOW_SHOWN
)
if main_window == nil:
quit "Main window has to be initialized!"
# Renderer
main_renderer = sdl2.createRenderer(
main_window,
-1,
Renderer_Accelerated or Renderer_PresentVsync or Renderer_TargetTexture
)
main_renderer.setDrawBlendMode(sdl2.BlendMode.BlendMode_Blend)
if main_renderer == nil:
echo sdl2.getError()
quit "An error occured while creating the renderer!"
# Initialize the TTF Fonts
init_font()
# Initialize the logo images
when DRAW_WITH_OPENGL == false:
nim_logo_texture = surface_to_texture(
file_to_surface("nim_logo.png")
)
sdl_logo_texture = surface_to_texture(
file_to_surface("sdl_logo.png")
)
opengl_logo_texture = surface_to_texture(
file_to_surface("opengl_logo.png")
)
chipmunk_logo_texture = surface_to_texture(
file_to_surface("chipmunk_logo.png")
)
proc draw_dot_sdl(position: chipmunk.Vect,
color: chipmunk.SpaceDebugColor=DOT_COLOR) =
data.main_renderer.setDrawColor(
uint8(255 * color.r),
uint8(255 * color.g),
uint8(255 * color.b),
uint8(255 * color.a)
)
data.main_renderer.drawPoint(
cint(position.x + DRAW_OFFSET.x),
cint(-position.y + DRAW_OFFSET.y) # Chipmunk Y coordinate is SDL reversed
)
proc draw_circle_sdl(position: chipmunk.Vect,
radius: float,
outline_color: chipmunk.SpaceDebugColor,
fill_color: chipmunk.SpaceDebugColor) {.inline.} =
var
adjusted_position = chipmunk.Vect(
x: position.x + DRAW_OFFSET.x,
y: -position.y + DRAW_OFFSET.y
)
main_renderer.filledCircleRGBA(
int16(adjusted_position.x),
int16(adjusted_position.y),
int16(radius),
uint8(255 * fill_color.r),
uint8(255 * fill_color.g),
uint8(255 * fill_color.b),
uint8(255 * fill_color.a)
)
main_renderer.circleRGBA(
int16(adjusted_position.x),
int16(adjusted_position.y),
int16(radius),
uint8(255 * outline_color.r),
uint8(255 * outline_color.g),
uint8(255 * outline_color.b),
uint8(255 * outline_color.a)
)
main_renderer.setDrawBlendMode(sdl2.BlendMode.BlendMode_Blend)
proc draw_line_sdl(point_from, point_to: chipmunk.Vect,
color: chipmunk.SpaceDebugColor=CHIPMUNK_GREY) {.inline.} =
main_renderer.setDrawColor(
uint8(255 * color.r),
uint8(255 * color.g),
uint8(255 * color.b),
uint8(255 * color.a)
)
main_renderer.drawLine(
cint(point_from.x + DRAW_OFFSET.x),
cint(-point_from.y + DRAW_OFFSET.y),
cint(point_to.x + DRAW_OFFSET.x),
cint(-point_to.y + DRAW_OFFSET.y)
)
proc draw_thick_line_sdl(point_from, point_to: chipmunk.Vect,
radius: chipmunk.Float,
outline_color: chipmunk.SpaceDebugColor,
fill_color: chipmunk.SpaceDebugColor) {.inline.} =
## This version is alpha blended, HIGH CPU USAGE!
#[
main_renderer.thickLineRGBA(
int16(point_from.x + DRAW_OFFSET.x),
int16(-point_from.y + DRAW_OFFSET.y),
int16(point_to.x + DRAW_OFFSET.x),
int16(-point_to.y + DRAW_OFFSET.y),
uint8(3),
uint8(color.r),
uint8(color.g),
uint8(color.b),
uint8(color.a)
)
main_renderer.setDrawBlendMode(sdl2.BlendMode.BlendMode_Blend)
]#
## Simple version with filled rectangle
var
vx: array[4, int16]
vy: array[4, int16]
point_1: chipmunk.Vect
point_2: chipmunk.Vect
point_3: chipmunk.Vect
point_4: chipmunk.Vect
normal: chipmunk.Vect
thickness: float
if radius < 2:
thickness = 2.0
else:
thickness = radius
# Draw the end circles
draw_circle_sdl(point_from, radius, CHIPMUNK_GREY, fill_color)
draw_circle_sdl(point_to, radius, CHIPMUNK_GREY, fill_color)
# Offset the from point
normal = (point_from - point_to).vnormalize()
point_1 = point_from + (normal.vperp()*thickness)
point_2 = point_from + (normal.vrperp()*thickness)
vx[0] = int16(point_1.x + DRAW_OFFSET.x)
vx[1] = int16(point_2.x + DRAW_OFFSET.x)
vy[0] = int16(-point_1.y + DRAW_OFFSET.y)
vy[1] = int16(-point_2.y + DRAW_OFFSET.y)
# Offset the to point
normal = (point_to - point_from).vnormalize()
point_3 = point_to + (normal.vperp()*thickness)
point_4 = point_to + (normal.vrperp()*thickness)
vx[2] = int16(point_3.x + DRAW_OFFSET.x)
vx[3] = int16(point_4.x + DRAW_OFFSET.x)
vy[2] = int16(-point_3.y + DRAW_OFFSET.y)
vy[3] = int16(-point_4.y + DRAW_OFFSET.y)
main_renderer.filledPolygonRGBA(
addr(vx[0]),
addr(vy[0]),
cint(4),
uint8(255 * fill_color.r),
uint8(255 * fill_color.g),
uint8(255 * fill_color.b),
uint8(255 * fill_color.a)
)
# Draw the side lines
draw_line_sdl(point_1, point_4)
draw_line_sdl(point_2, point_3)
proc draw_polygon_sdl(points: openarray[chipmunk.Vect],
color: chipmunk.SpaceDebugColor) =
var
vx: seq[int16] = @[]
vy: seq[int16] = @[]
for i in 0..points.high:
vx.add(int16(points[i].x + DRAW_OFFSET.x))
vy.add(int16(-points[i].y + DRAW_OFFSET.y))
main_renderer.polygonRGBA(
addr(vx[0]),
addr(vy[0]),
cint(points.len()),
uint8(255 * color.r),
uint8(255 * color.g),
uint8(255 * color.b),
uint8(255 * color.a)
)
proc draw_filled_polygon_sdl(points: openarray[chipmunk.Vect],
color: chipmunk.SpaceDebugColor) =
var
vx: seq[int16] = @[]
vy: seq[int16] = @[]
for i in 0..points.high:
vx.add(int16(points[i].x + DRAW_OFFSET.x))
vy.add(int16(-points[i].y + DRAW_OFFSET.y))
main_renderer.filledPolygonRGBA(
addr(vx[0]),
addr(vy[0]),
cint(points.len()),
uint8(255 * color.r),
uint8(255 * color.g),
uint8(255 * color.b),
uint8(255 * color.a)
)
proc draw_rounded_polygon_sdl(points: openarray[chipmunk.Vect],
radius: GLfloat,
outline_color: chipmunk.SpaceDebugColor,
fill_color: chipmunk.SpaceDebugColor) =
type
ExtrudeVerts = object
offset: chipmunk.Vect
n: chipmunk.Vect
# Create the arc points
if radius > 2.0:
var
count = points.len()
extrude: seq[ExtrudeVerts] = newSeq[ExtrudeVerts](count)
inset: chipmunk.Float = -fmax(0.0f, 1.0f - radius)
outset = 1.0f + radius - inset
# Extrude the polygon vertices according to the radius
for i in 0..count-1:
var
v0: chipmunk.Vect = points[(i - 1 + count) mod count]
v1: chipmunk.Vect = points[i]
v2: chipmunk.Vect = points[(i + 1) mod count]
n1: chipmunk.Vect = vnormalize(vrperp(vsub(v1, v0)))
n2: chipmunk.Vect = vnormalize(vrperp(vsub(v2, v1)))
offset: chipmunk.Vect = vmult(
vadd(n1, n2),
1.0 / (vdot(n1, n2) + 1.0)
)
v: ExtrudeVerts = ExtrudeVerts(offset: offset, n: n2)
extrude[i] = v
# Create the arc points
const arc_segments = 8
var pts: seq[chipmunk.Vect] = newSeq[chipmunk.Vect](arc_segments*count)
for i in 0..count-1:
var
j = if i == 0: count-1 else: i-1
v_0: chipmunk.Vect = points[i]
n_0: chipmunk.Vect = extrude[i].n
n_1: chipmunk.Vect = extrude[j].n
offset_0: chipmunk.Vect = extrude[i].offset
inner_0: chipmunk.Vect = vadd(v_0, vmult(offset_0, inset))
corner_0 = vadd(inner_0, vmult(n_1, outset))
corner_1 = vadd(inner_0, vmult(n_0, outset))
# The part that creates the starting and length angle
vec_0 = (corner_0 - inner_0).vnormalize()
start_angle = -arctan2(vec_0.x, vec_0.y) + math.PI/2.0
vec_1 = (corner_1 - inner_0).vnormalize()
arc_angle = math.arccos(vdot(vec_0, vec_1))
arc_points = get_arc_points(
inner_0.x,
inner_0.y,
radius,
start_angle,
arc_angle,
arc_segments-2
)
current_index = i*arc_segments
pts[current_index] = corner_0
var cnt = 1
for p in arc_points:
pts[current_index + cnt] = p
cnt += 1
pts[current_index + cnt] = corner_1
# Draw the polygon
draw_filled_polygon_sdl(pts, fill_color)
draw_polygon_sdl(pts, outline_color)
else:
## The curve is too small, just extrude the vertices by the radius
var
count = points.len()
extrude: seq[ExtrudeVerts] = newSeq[ExtrudeVerts](count)
inset: chipmunk.Float = -fmax(0.0f, 1.0f - radius)
outset = 1.0f + radius - inset
# Calculate the center
var
center = chipmunk.vzero
pts: seq[chipmunk.Vect] = newSeq[chipmunk.Vect](count)
for i in 0..count-1:
center = vadd(center, points[i])
center = chipmunk.v(center.x / count.float(), center.y / count.float())
# Extrude the vertices
for i in 0..count-1:
var normal = (points[i] - center).vnormalize()
pts[i] = points[i] + (normal * radius)
# Draw the polygon
draw_filled_polygon_sdl(pts, fill_color)
draw_polygon_sdl(pts, outline_color)
proc clean_up_sdl*() =
destroy(main_renderer)
destroy(main_window)
## OpenGL procedures
# This will identify our vertex buffer
var
vertexbuffer: GLuint
g_vertex_buffer_data: array[6, GLfloat] = [
100.0f, 100.0f,
150.0f, 150.0f,
50.0f, 150.0f
]
proc init_opengl() =
if sdl2.init(INIT_EVERYTHING) != SDL_Success:
quit "Error initializing SDL!"
main_window = createWindow(
"Nim-Chipmunk demo samples",
sdl2.SDL_WINDOWPOS_CENTERED,
sdl2.SDL_WINDOWPOS_CENTERED,
cint(WINDOW_SIZE.width),
cint(WINDOW_SIZE.height),
SDL_WINDOW_OPENGL #or SDL_WINDOW_RESIZABLE
)
if main_window == nil:
quit "Error creating SDL window!"
context = main_window.glCreateContext()
if context == nil:
quit "Error creating OpenGL context!"
discard glSetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE)
discard glSetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, GL_MAJOR_VERSION.ord)
discard glSetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, GL_MINOR_VERSION.ord)
loadExtensions()
# glMatrixMode(GL_PROJECTION)
# glPushMatrix()
# glLoadIdentity()
gluOrtho2D(0, WINDOW_SIZE.width, WINDOW_SIZE.height, 0)
# glMatrixMode(GL_MODELVIEW)
# glPushMatrix()
# glLoadIdentity()
# Display the OpenGL Version string
version = cast[cstring](glGetString(GL_VERSION))
echo(version)
if main_window.glMakeCurrent(context) != 0:
quit "Error setting up OpenGL context!"
# Initialize the TTF Fonts
init_font()
# Initialize the logos
when DRAW_WITH_OPENGL == true:
nim_logo_surface = resize_surface(
file_to_surface("nim_logo.png"),
nim_logo_rectangle.w,
nim_logo_rectangle.h,
)
sdl_logo_surface = resize_surface(
file_to_surface("sdl_logo.png"),
sdl_logo_rectangle.w,
sdl_logo_rectangle.h,
)
opengl_logo_surface = resize_surface(
file_to_surface("opengl_logo.png"),
opengl_logo_rectangle.w,
opengl_logo_rectangle.h,
)
chipmunk_logo_surface = resize_surface(
file_to_surface("chipmunk_logo.png"),
chipmunk_logo_rectangle.w,
chipmunk_logo_rectangle.h,
)
# Generate 1 buffer, put the resulting identifier in vertexbuffer
glGenBuffers(1, addr(vertexbuffer))
# The following commands will talk about our 'vertexbuffer' buffer
glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer)
# Give our vertices to OpenGL.
glBufferData(
GL_ARRAY_BUFFER,
len(g_vertex_buffer_data),
addr(g_vertex_buffer_data),
GL_STATIC_DRAW
)
proc draw_text_opengl(text: string, position: chipmunk.Vect,
color: chipmunk.SpaceDebugColor=CHIPMUNK_WHITE) =
var
text_surface: sdl2.SurfacePtr
texture: GLuint
glColor4f(color.r, color.g, color.b, color.a)
glDisable(GL_DEPTH_TEST)
glEnable(GL_TEXTURE_2D)
glEnable(GL_BLEND)
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
glGenTextures(1, addr(texture))
glBindTexture(GL_TEXTURE_2D, texture)
text_surface = ttf.renderUtf8Blended(font, text, color)
if text_surface == nil:
quit("Error creating text surface: '" & text & "'")
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
glTexImage2D(
GL_TEXTURE_2D,
0,
GL_RGBA.ord,
text_surface.w,
text_surface.h,
0,
GL_BGRA,
GL_UNSIGNED_BYTE,
text_surface.pixels
)
glBegin(GL_QUADS)
block:
glTexCoord2f(0,0)
glVertex2f(position.x, position.y)
glTexCoord2f(1,0)
glVertex2f(position.x + float(text_surface.w), position.y)
glTexCoord2f(1,1)
glVertex2f(
position.x + float(text_surface.w),
position.y + float(text_surface.h)
)
glTexCoord2f(0,1)
glVertex2f(position.x, position.y + float(text_surface.h))
glEnd()
glDeleteTextures(1, addr(texture))
freeSurface(text_surface)
proc draw_dot_opengl(point: chipmunk.Vect,
size: chipmunk.Float=1.0,
color: chipmunk.SpaceDebugColor=DOT_COLOR) =
glColor4f(color.r, color.g, color.b, color.a)
glPointSize(size/2.0)
glBegin(GL_POINTs);
glVertex2f(
point.x + DRAW_OFFSET.x,
-point.y + DRAW_OFFSET.y
)
glEnd()
proc draw_filled_circle_opengl(position: chipmunk.Vect, radius: GLfloat,
color: chipmunk.SpaceDebugColor) =
var triangleAmount = 30 # of triangles used to draw circle
glColor4f(color.r, color.g, color.b, color.a)
glBegin(GL_TRIANGLE_FAN)
# Center of circle
glVertex2f(
position.x + DRAW_OFFSET.x,
-position.y + DRAW_OFFSET.y
)
for i in 0..triangleAmount:
glVertex2f(
position.x + (radius * math.cos(GLfloat(i) * TWICE_PI / GLfloat(triangleAmount))) + DRAW_OFFSET.x,
-position.y + (radius * math.sin(GLfloat(i) * TWICE_PI / GLfloat(triangleAmount))) + DRAW_OFFSET.y
)
glEnd()
proc draw_circle_opengl(position: chipmunk.Vect, radius, angle: GLfloat,
color: chipmunk.SpaceDebugColor, draw_angle: bool=true) =
var lineAmount = 30 # of triangles used to draw circle
glColor4f(color.r, color.g, color.b, color.a)
# Draw circle outline
glBegin(GL_LINE_LOOP)
for i in 0..lineAmount:
glVertex2f(
position.x + (radius * math.cos(GLfloat(i) * TWICE_PI / GLfloat(lineAmount))) + DRAW_OFFSET.x,
-position.y + (radius * math.sin(GLfloat(i) * TWICE_PI / GLfloat(lineAmount))) + DRAW_OFFSET.y
)
glEnd()
# Draw angle line
if draw_angle == true:
glBegin(GL_LINE_STRIP)
var
r: chipmunk.Vect = chipmunk.Vect(x: 0.0, y: 1.0)
p: chipmunk.Vect = chipmunk.Vect(x: position.x, y: position.y)
c: float = math.cos(angle)
s: float = math.sin(angle)
r = chipmunk.Vect(
x: r.x * c - r.y * s,
y: r.x * s + r.y * c
)
r = r * radius
r = r + p
glVertex2f(
position.x + DRAW_OFFSET.x,
-position.y + DRAW_OFFSET.y
)
glVertex2f(
r.x + DRAW_OFFSET.x,
-r.y + DRAW_OFFSET.y
)
glEnd()
proc draw_arc_opengl(cx, cy, r, start_angle, arc_angle :GLfloat, num_segments: int) =
var points = get_arc_points(cx, cy, r, start_angle, arc_angle, num_segments)
glBegin(GL_LINE_STRIP)
for p in points:
glVertex2f(
p.x + DRAW_OFFSET.x,
-p.y + DRAW_OFFSET.y
)
glEnd()
proc draw_filled_polygon_opengl(points: openarray[chipmunk.Vect],
color: chipmunk.SpaceDebugColor) =
glColor4f(color.r, color.g, color.b, color.a)
glPointSize(1.0f)
glBegin(GL_POLYGON)
for point in points:
glVertex2f(
point.x + DRAW_OFFSET.x,
-point.y + DRAW_OFFSET.y
)
glEnd()
proc draw_polygon_opengl(points: openarray[chipmunk.Vect],
color: chipmunk.SpaceDebugColor) =
glColor4f(color.r, color.g, color.b, color.a)
glPointSize(1.0f)
glLineWidth(1.0f)
glBegin(GL_LINE_LOOP)
for point in points:
glVertex2f(
point.x + DRAW_OFFSET.x,
-point.y + DRAW_OFFSET.y
)
glEnd()
proc draw_line_opengl(point_from, point_to: chipmunk.Vect,
color: chipmunk.SpaceDebugColor) =
glColor4f(color.r, color.g, color.b, color.a)
glPointSize(1.0f)
glLineWidth(1.0f)
glBegin(GL_LINE_STRIP)
glVertex2f(
point_from.x + DRAW_OFFSET.x,
-point_from.y + DRAW_OFFSET.y
)
glVertex2f(
point_to.x + DRAW_OFFSET.x,
-point_to.y + DRAW_OFFSET.y
)
glEnd()
proc draw_thick_line_opengl(point_from, point_to: chipmunk.Vect, radius: GLfloat,
outline_color, fill_color: chipmunk.SpaceDebugColor) =
var
points: array[4, chipmunk.Vect]
normal: chipmunk.Vect
thickness = if radius < 1.0: 1.0 else: radius
line_thickness = 0.975 * thickness # This makes the side lines look better
# Circle at the 'from' point
draw_filled_circle_opengl(point_from, thickness, fill_color)
draw_circle_opengl(point_from, thickness, 0.0, outline_color, draw_angle=false)
# Circle at the 'to' point
draw_filled_circle_opengl(point_to, thickness, fill_color)
draw_circle_opengl(point_to, thickness, 0.0, outline_color, draw_angle=false)
# Draw the line with a polygon
# Offset the from point
normal = (point_from - point_to).vnormalize()
points[0] = point_from + (normal.vperp()*line_thickness)
points[1] = point_from + (normal.vrperp()*line_thickness)
# Offset the to point
normal = (point_to - point_from).vnormalize()
points[2] = point_to + (normal.vperp()*line_thickness)
points[3] = point_to + (normal.vrperp()*line_thickness)
# Draw the polygon representing the line
draw_filled_polygon_opengl(points, fill_color)
# Draw the side lines
draw_line_opengl(points[0], points[3], outline_color)
draw_line_opengl(points[1], points[2], outline_color)
proc draw_triangle_opengl(p1, p2, p3: chipmunk.Vect,
color: chipmunk.SpaceDebugColor) =
var point_array: array[3, chipmunk.Vect] = [p1, p2, p3]
glColor4f(color.r, color.g, color.b, color.a)
glPointSize(1.0f)
glLineWidth(1.0f)
glBegin(GL_LINE_LOOP)
for point in point_array:
glVertex2f(
point.x + DRAW_OFFSET.x,
-point.y + DRAW_OFFSET.y
)
glEnd()
proc draw_filled_triangle_opengl(p1, p2, p3: chipmunk.Vect,
color: chipmunk.SpaceDebugColor) =
glBegin(GL_TRIANGLES)
glColor4f(color.r, color.g, color.b, color.a)
glVertex2f(p1.x, p1.y)
glVertex2f(p2.x, p2.y)
glVertex2f(p3.x, p3.y)
glEnd()
proc draw_rounded_polygon_opengl(points: openarray[chipmunk.Vect],
radius: GLfloat,
outline_color: chipmunk.SpaceDebugColor,
fill_color: chipmunk.SpaceDebugColor) =
type
ExtrudeVerts = object
offset: chipmunk.Vect
n: chipmunk.Vect
# Create the arc points
if radius > 2.0:
var
count = points.len()
extrude: seq[ExtrudeVerts] = newSeq[ExtrudeVerts](count)
inset: chipmunk.Float = -fmax(0.0f, 1.0f - radius)
outset = 1.0f + radius - inset
# Extrude the polygon vertices according to the radius
for i in 0..count-1:
var
v0: chipmunk.Vect = points[(i - 1 + count) mod count]
v1: chipmunk.Vect = points[i]
v2: chipmunk.Vect = points[(i + 1) mod count]
n1: chipmunk.Vect = vnormalize(vrperp(vsub(v1, v0)))
n2: chipmunk.Vect = vnormalize(vrperp(vsub(v2, v1)))
offset: chipmunk.Vect = vmult(
vadd(n1, n2),
1.0 / (vdot(n1, n2) + 1.0)
)
v: ExtrudeVerts = ExtrudeVerts(offset: offset, n: n2)
extrude[i] = v
# Create the arc points