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hadean-zig
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depth testing & colors

stable
Ivory 2024-08-21 16:36:46 -04:00
parent 7146de6c50
commit d9ef89495b
4 changed files with 46 additions and 62 deletions
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30
src/Color.zig 100644
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@ -0,0 +1,30 @@
const Color = @This();
r: f32,
g: f32,
b: f32,
a: f32,
pub fn rgba(r: f32, g: f32, b: f32, a: f32) Color {
return .{
.r = r,
.g = g,
.b = b,
.a = a,
};
}
pub const WHITE = rgba(1, 1, 1, 1);
pub const RED = rgba(1, 0, 0, 1);
pub const ORANGE = rgba(1, 0.5, 0, 1);
pub const YELLOW = rgba(1, 1, 0, 1);
pub const LIME = rgba(0.5, 1, 0, 1);
pub const GREEN = rgba(0, 1, 0, 1);
pub const TEAL = rgba(0, 1, 0.5, 1);
pub const CYAN = rgba(0, 1, 1, 1);
pub const LIGHT_BLUE = rgba(0, 0.5, 1, 1);
pub const BLUE = rgba(0, 0, 1, 1);
pub const INDIGO = rgba(0.5, 0, 1, 1);
pub const MAGENTA = rgba(1, 0, 1, 1);
pub const HOT_PINK = rgba(1, 0, 0.5, 1);

14
src/Sprite.zig
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@ -1,6 +1,7 @@
const Rectf = @import("geometry/Rectf.zig");
const Recti = @import("geometry/Recti.zig");
const Vec2f = @import("geometry/Vec2f.zig");
const Color = @import("Color.zig");
const Texture = @import("Texture.zig");
const Layer = @import("Layer.zig");
const shaders = @import("shaders.zig");
@ -23,23 +24,22 @@ pub fn create(tex: *const Texture, rect: Recti) Sprite {
};
}
pub fn draw(self: *const Sprite, screen_pos: *const Recti, layer: Layer) void {
pub fn draw(self: *const Sprite, screen_pos: *const Recti, layer: Layer, color: Color) void {
self.texture.bind(c.GL_TEXTURE0);
c.glBegin(c.GL_QUADS);
{
c.glVertexAttrib2f(shaders.TEXCOORD_ATTRIBUTE_ID, self.texture_area.a.x, self.texture_area.a.y);
c.glVertexAttrib4f(shaders.COLOR_ATTRIBUTE_ID, 1, 1, 1, 1);
c.glVertexAttrib4f(shaders.COLOR_ATTRIBUTE_ID, color.r, color.g, color.b, color.a);
c.glVertex3i(screen_pos.a.x, screen_pos.a.y, layer.z_index);
c.glVertexAttrib2f(shaders.TEXCOORD_ATTRIBUTE_ID, self.texture_area.b.x, self.texture_area.a.y);
c.glVertexAttrib4f(shaders.COLOR_ATTRIBUTE_ID, 1, 1, 1, 1);
c.glVertexAttrib4f(shaders.COLOR_ATTRIBUTE_ID, color.r, color.g, color.b, color.a);
c.glVertex3i(screen_pos.b.x, screen_pos.a.y, layer.z_index);
c.glVertexAttrib2f(shaders.TEXCOORD_ATTRIBUTE_ID, self.texture_area.b.x, self.texture_area.b.y);
c.glVertexAttrib4f(shaders.COLOR_ATTRIBUTE_ID, 1, 1, 1, 1);
c.glVertexAttrib4f(shaders.COLOR_ATTRIBUTE_ID, color.r, color.g, color.b, color.a);
c.glVertex3i(screen_pos.b.x, screen_pos.b.y, layer.z_index);
c.glVertexAttrib2f(shaders.TEXCOORD_ATTRIBUTE_ID, self.texture_area.a.x, self.texture_area.b.y);
c.glVertexAttrib4f(shaders.COLOR_ATTRIBUTE_ID, 1, 1, 1, 1);
c.glVertexAttrib4f(shaders.COLOR_ATTRIBUTE_ID, color.r, color.g, color.b, color.a);
c.glVertex3i(screen_pos.a.x, screen_pos.b.y, layer.z_index);
}
c.glEnd();
}
}

15
src/engine.zig
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@ -5,6 +5,7 @@ const shaders = @import("shaders.zig");
const Texture = @import("Texture.zig");
const Sprite = @import("Sprite.zig");
const Layer = @import("Layer.zig");
const Color = @import("Color.zig");
const c = @cImport({
@cInclude("glad/glad.h");
@ -73,11 +74,11 @@ pub fn run() !void {
c.glClearColor(clearBrightness, clearBrightness, clearBrightness, 1.0);
// c.glEnable(c.GL_MULTISAMPLE);
c.glDisable(c.GL_MULTISAMPLE);
// c.glEnable(c.GL_BLEND);
// c.glBlendFunc(c.GL_SRC_ALPHA, c.GL_ONE_MINUS_SRC_ALPHA);
// c.glEnable(c.GL_DEPTH_TEST);
// c.glDepthFunc(c.GL_LEQUAL);
// c.glDepthMask(c.GL_TRUE);
c.glEnable(c.GL_BLEND);
c.glBlendFunc(c.GL_SRC_ALPHA, c.GL_ONE_MINUS_SRC_ALPHA);
c.glEnable(c.GL_DEPTH_TEST);
c.glDepthFunc(c.GL_LEQUAL);
c.glDepthMask(c.GL_TRUE);
var width: c_int = undefined;
var height: c_int = undefined;
@ -103,7 +104,9 @@ pub fn run() !void {
// // c.glVertexAttrib4f(1, 0, 0, 1, 1);
//
// c.glEnd();
sprite.draw(&Recti.from_xywh(100, 100, 32, 64), Layer.FLOOR);
sprite.draw(&Recti.from_xywh(120, 100, 32, 64), Layer.ENTITIES, Color.LIGHT_BLUE);
sprite.draw(&Recti.from_xywh(100, 100, 32, 64), Layer.FLOOR, Color.WHITE);
sprite.draw(&Recti.from_xywh(80, 100, 32, 64), Layer.ENTITIES, Color.INDIGO);
// draw.rect(&geometry.Rect.from_xywh(100, 100, 256, 256), draw.Layer.FLOOR);
// game.render();

49
src/geometry.zig
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@ -1,49 +0,0 @@
const Vec2i = @import("geometry/Vec2i.zig");
pub const Recti = struct {
x: i32,
y: i32,
w: i32,
h: i32,
a: Vec2i,
b: Vec2i,
pub fn from_xywh(x: i32, y: i32, w: i32, h: i32) Recti {
return .{
.x = x,
.y = y,
.w = w,
.h = h,
.a = Vec2i.new(x, y),
.b = Vec2i.new(x + w, y + h),
};
}
};
pub const Matrix4f = struct {
values: [16]f32 = identity,
const SIZE: i8 = 4 * 4;
const identity = from_values([16]f32 {
1, 0, 0, 0,
0, 1, 0, 0,
0, 0, 1, 0,
0, 0, 0, 1,
});
pub fn from_values(values: [16]f32) Matrix4f {
return .{ .values = values };
}
pub fn orthographic(left: f32, right: f32, bottom: f32, top: f32, near: f32, far: f32) Matrix4f {
var ortho = Matrix4f.identity;
ortho.values[0 + 0 * 4] = 2.0 / (right - left);
ortho.values[1 + 1 * 4] = 2.0 / (top - bottom);
ortho.values[2 + 2 * 4] = 2.0 / (near - far);
ortho.values[0 + 3 * 4] = (left + right) / (left - right);
ortho.values[1 + 3 * 4] = (bottom + top) / (bottom - top);
ortho.values[2 + 3 * 4] = (far + near) / (far - near);
return ortho;
}
};