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fake 3d

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This commit is contained in:
Max Amundsen
2024-10-11 01:52:10 -04:00
parent 823a8f79d3
commit a663e45131
7 changed files with 96 additions and 76 deletions
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2
modules/Console_Render/draw.jai
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@@ -1,7 +1,7 @@
// "Squashes" two dimensional coordinates onto the one dimensional screen buffer
draw :: (using screen: *Screen, p: Vec2s64, char: u8 = DEFAULT_PIXEL_CHAR) {
if p.x >= 0 && p.x < width && p.y >= 0 && p.y < height {
buffer[p.y * width + p.x] = cast(u8)char;
buffer[p.y * width + p.x] = char;
}
}

15
modules/Console_Render/math_extras.jai
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@@ -17,18 +17,3 @@ make_quad_from_rect :: (p1: Vec2s64, p2: Vec2s64) -> Quad {
.{ p1.x, p2.y },
};
}
scale :: (factor: float, pn: ..*Vec2s64) {
for pn {
it.x = cast(s64)(it.x * factor);
it.y = cast(s64)(it.y * factor);
}
}
scale :: (factor: float, t: *Triangle) {
scale(factor, *t.p1, *t.p2, *t.p3);
}
scale :: (factor: float, q: *Quad) {
scale(factor, *q.p1, *q.p2, *q.p3, *q.p4);
}

2
modules/Console_Render/module.jai
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@@ -106,6 +106,8 @@ maybe_resize_screen :: (screen: *Screen) {
#load "draw.jai";
#load "rotate.jai";
#load "scale.jai";
#load "translate.jai";
#load "file_operations.jai";
#load "console.jai";
#load "math_extras.jai";

14
modules/Console_Render/rotate.jai
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@@ -1,5 +1,5 @@
// single point rotation
rotate :: (p: *Vec2s64, center: Vec2s64, angle: s64) {
rotate :: (angle: s64, center: Vec2s64, p: *Vec2s64) {
rad := cast(float64)angle * (PI / 180.0);
// translate to center
@@ -16,18 +16,18 @@ rotate :: (p: *Vec2s64, center: Vec2s64, angle: s64) {
}
// rotate n points
rotate :: (pn: ..*Vec2s64, center: Vec2s64, angle: s64) {
rotate :: (angle: s64, center: Vec2s64, pn: ..*Vec2s64) {
for pn {
rotate(it, center, angle);
rotate(angle, center, it);
}
}
// rotate 3 points via triangle struct
rotate :: (t: *Triangle, center: Vec2s64, angle: s64) {
rotate(*t.p1, *t.p2, *t.p3, center = center, angle = angle);
rotate :: (angle: s64, center: Vec2s64, t: *Triangle) {
rotate(angle, center, *t.p1, *t.p2, *t.p3);
}
// rotate 4 points via quad struct
rotate :: (q: *Quad, center: Vec2s64, angle: s64) {
rotate(*q.p1, *q.p2, *q.p3, *q.p4, center = center, angle = angle);
rotate :: (angle: s64, center: Vec2s64, q: *Quad) {
rotate(angle, center, *q.p1, *q.p2, *q.p3, *q.p4);
}

14
modules/Console_Render/scale.jai Normal file
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@@ -0,0 +1,14 @@
scale :: (factor: Vector2, pn: ..*Vec2s64) {
for pn {
it.x = cast(s64)(it.x * factor.x);
it.y = cast(s64)(it.y * factor.y);
}
}
scale :: (factor: Vector2, t: *Triangle) {
scale(factor, *t.p1, *t.p2, *t.p3);
}
scale :: (factor: Vector2, q: *Quad) {
scale(factor, *q.p1, *q.p2, *q.p3, *q.p4);
}

18
modules/Console_Render/translate.jai Normal file
View File

@@ -0,0 +1,18 @@
// for n points
translate :: (amount: Vec2s64, pn: ..*Vec2s64) {
for pn {
it.x += amount.x;
it.y += amount.y;
}
}
// for a triangle
translate :: (amount: Vec2s64, t: *Triangle) {
translate(amount, *t.p1, *t.p2, *t.p3);
}
// for a quad
translate :: (amount: Vec2s64, q: *Quad) {
translate(amount, *q.p1, *q.p2, *q.p3, *q.p4);
}

107
src/main.jai
View File

@@ -4,73 +4,29 @@ main :: () {
w, h := get_console_size();
init_screen(screen, w, h);
i := 0;
j := 0;
offset := 0;
theta := 0;
increase := true;
while true {
j += 1;
theta += 1;
if i == 0 {
increase = true;
}
if i == 100 {
increase = false;
}
if offset == 0 then increase = true;
if offset == 100 then increase = false;
if increase {
i += 1;
offset += 1;
} else {
i -= 1;
offset -= 1;
}
fill_entire_screen(screen, BLANK_PIXEL);
t1 := Triangle.{
.{30 - i, 20},
.{95, 10 - (i / 2)},
.{90 + i, 40},
};
cool_demo_1(screen, offset, theta);
scale(0.01 * i, *t1);
draw_triangle(screen, t1, #char "%");
scale(0.02 * i, *t1);
draw_triangle(screen, t1, #char "%");
scale(0.03 * i, *t1);
draw_triangle(screen, t1, #char "%");
t2 := Triangle.{
.{100, 30},
.{140, 30},
.{120, 20},
};
rotate(*t2, get_triangle_centroid(t2), -j);
draw_triangle(screen, t2);
q1 := make_quad_from_rect(
.{100, 10},
.{110, 20}
);
rotate(*q1, .{100, 10}, j);
draw_quad(screen, q1, #char "-");
annoying_color_effect(screen, offset);
draw_text(screen, .{10, 10}, "[ TEXT-BASED RENDERING DEMO ]");
if i % 3 == 0 {
set_console_color(.RED);
} else if i % 5 == 0 {
set_console_color(.GREEN);
} else {
set_console_color(.BLUE, .BOLD);
}
swap_buffer(screen);
sleep_milliseconds(20);
@@ -78,6 +34,51 @@ main :: () {
}
}
annoying_color_effect :: (screen: *Screen, modifier: s64) {
if modifier % 3 == 0 {
set_console_color(.RED);
} else if modifier % 5 == 0 {
set_console_color(.GREEN);
} else {
set_console_color(.BLUE, .BOLD);
}
}
cool_demo_1 :: (screen: *Screen, offset: s64, theta: s64) {
t1 := Triangle.{
.{30 - offset, 20},
.{95, 10 - (offset / 2)},
.{90 + offset, 40},
};
scale(.{0.5, 0.8}, *t1);
translate(.{0, 20}, *t1);
translate(.{50, 5}, *t1);
rotate(theta, get_triangle_centroid(t1), *t1);
draw_triangle(screen, t1, #char "%");
t2 := t1;
scale(.{0.5, 0.5}, *t1);
draw_triangle(screen, t1, #char "%");
draw_line(screen, t1.p1, t2.p1, #char "%");
draw_line(screen, t1.p2, t2.p2, #char "%");
draw_line(screen, t1.p3, t2.p3, #char "%");
}
cool_demo_2 :: (screen: *Screen, offset: s64, theta: s64) {
q1 := make_quad_from_rect(
.{100, 10},
.{110, 20}
);
rotate(-theta, .{100, 10}, *q1);
draw_quad(screen, q1, #char "-");
}
#import "Console_Render";
#import "Basic";
#import "Math";