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Add ported solar system example
This commit is contained in:
maiconpintoabreu
Nikolas
parent
163b1ef2e9
commit
d9933008f5
@ -373,6 +373,11 @@ pub fn build(b: *std.Build) !void {
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.path = "examples/models/models_box_collisions.zig",
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.desc = "Box collisions",
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},
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.{
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.name = "models_rlgl_solar_system",
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.path = "examples/models/models_rlgl_solar_system.zig",
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.desc = "Solar System",
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},
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// .{
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// .name = "shaders_basic_lighting",
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// .path = "examples/shaders/shaders_basic_lighting.zig",
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153
examples/models/models_rlgl_solar_system.zig
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153
examples/models/models_rlgl_solar_system.zig
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@ -0,0 +1,153 @@
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const std = @import("std");
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const rl = @import("raylib");
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const rlgl = rl.gl;
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pub fn main() anyerror!void {
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const screenWidth: i32 = 800;
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const screenHeight: i32 = 450;
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const sunRadius = 4.0;
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const earthRadius = 0.6;
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const earthOrbitRadius = 8.0;
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const moonRadius = 0.16;
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const moonOrbitRadius = 1.5;
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rl.initWindow(screenWidth, screenHeight, "raylib [models] example - rlgl solar system");
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// Define the camera to look into our 3d world
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var camera: rl.Camera = std.mem.zeroes(rl.Camera);
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camera.position = .{ .x = 16.0, .y = 16.0, .z = 16.0 }; // Camera position
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camera.target = .{ .x = 0.0, .y = 0.0, .z = 0.0 }; // Camera looking at point
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camera.up = .{ .x = 0.0, .y = 1.0, .z = 0.0 }; // Camera up vector (rotation towards target)
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camera.fovy = 45.0; // Camera field-of-view Y
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camera.projection = .perspective; // Camera projection type
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const rotationSpeed: f32 = 0.2; // General system rotation speed
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var earthRotation: f32 = 0.0; // Rotation of earth around itself (days) in degrees
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var earthOrbitRotation: f32 = 0.0; // Rotation of earth around the Sun (years) in degrees
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var moonRotation: f32 = 0.0; // Rotation of moon around itself
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var moonOrbitRotation: f32 = 0.0; // Rotation of moon around earth in degrees
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// De-Initialization
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//--------------------------------------------------------------------------------------
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defer rl.closeWindow(); // Close window and OpenGL context
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//--------------------------------------------------------------------------------------
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rl.setTargetFPS(60); // Set our game to run at 60 frames-per-second
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while (!rl.windowShouldClose()) {
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// Update
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//----------------------------------------------------------------------------------
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rl.updateCamera(&camera, .orbital);
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earthRotation += (5.0 * rotationSpeed);
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earthOrbitRotation += (365.0 / 360.0 * (5.0 * rotationSpeed) * rotationSpeed);
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moonRotation += (2.0 * rotationSpeed);
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moonOrbitRotation += (8.0 * rotationSpeed);
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//----------------------------------------------------------------------------------
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// Draw
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//----------------------------------------------------------------------------------
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rl.beginDrawing();
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defer rl.endDrawing();
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rl.clearBackground(.ray_white);
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{
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rl.beginMode3D(camera);
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defer rl.endMode3D();
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rlgl.rlPushMatrix();
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rlgl.rlScalef(sunRadius, sunRadius, sunRadius); // Scale Sun
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drawSphereBasic(.gold); // Draw the Sun
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rlgl.rlPopMatrix();
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rlgl.rlPushMatrix();
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rlgl.rlRotatef(earthOrbitRotation, 0.0, 1.0, 0.0); // Rotation for Earth orbit around Sun
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rlgl.rlTranslatef(earthOrbitRadius, 0.0, 0.0); // Translation for Earth orbit
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rlgl.rlPushMatrix();
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rlgl.rlRotatef(earthRotation, 0.25, 1.0, 0.0); // Rotation for Earth itself
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rlgl.rlScalef(earthRadius, earthRadius, earthRadius); // Scale Earth
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drawSphereBasic(.blue); // Draw the Earth
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rlgl.rlPopMatrix();
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rlgl.rlRotatef(moonOrbitRotation, 0.0, 1.0, 0.0); // Rotation for Moon orbit around Earth
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rlgl.rlTranslatef(moonOrbitRadius, 0.0, 0.0); // Translation for Moon orbit
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rlgl.rlRotatef(moonRotation, 0.0, 1.0, 0.0); // Rotation for Moon itself
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rlgl.rlScalef(moonRadius, moonRadius, moonRadius); // Scale Moon
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drawSphereBasic(.light_gray); // Draw the Moon
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rlgl.rlPopMatrix();
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// Some reference elements (not affected by previous matrix transformations)
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rl.drawCircle3D(.{ .x = 0.0, .y = 0.0, .z = 0.0 }, earthOrbitRadius, .{ .x = 1, .y = 0, .z = 0 }, 90.0, rl.fade(.red, 0.5));
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rl.drawGrid(20, 1.0);
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}
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rl.drawText("EARTH ORBITING AROUND THE SUN!", 400, 10, 20, .maroon);
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rl.drawFPS(10, 10);
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//----------------------------------------------------------------------------------
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}
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}
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//--------------------------------------------------------------------------------------------
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// Module Functions Definition
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//--------------------------------------------------------------------------------------------
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// Draw sphere without any matrix transformation
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// NOTE: Sphere is drawn in world position ( 0, 0, 0 ) with radius 1.0f
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fn drawSphereBasic(color: rl.Color) void {
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const rings: usize = 16;
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const slices: usize = 16;
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const floatRings: f32 = @floatFromInt(rings);
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const floatSlices: f32 = @floatFromInt(slices);
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// Make sure there is enough space in the internal render batch
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// buffer to store all required vertex, batch is reseted if required
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_ = rlgl.rlCheckRenderBatchLimit((rings + 2) * slices * 6);
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rlgl.rlBegin(rlgl.rl_triangles);
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rlgl.rlColor4ub(color.r, color.g, color.b, color.a);
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for (0..(rings + 2)) |i| {
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const floatI: f32 = @floatFromInt(i);
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for (0..slices) |j| {
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const floatJ: f32 = @floatFromInt(j);
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rlgl.rlVertex3f(
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std.math.cos(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * floatI)) * std.math.sin(std.math.rad_per_deg * (floatJ * 360 / floatSlices)),
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std.math.sin(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * floatI)),
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std.math.cos(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * floatI)) * std.math.cos(std.math.rad_per_deg * (floatJ * 360 / floatSlices)),
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);
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rlgl.rlVertex3f(
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std.math.cos(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * (floatI + 1.0))) * std.math.sin(std.math.rad_per_deg * ((floatJ + 1.0) * 360 / floatSlices)),
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std.math.sin(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * (floatI + 1.0))),
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std.math.cos(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * (floatI + 1.0))) * std.math.cos(std.math.rad_per_deg * ((floatJ + 1.0) * 360 / floatSlices)),
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);
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rlgl.rlVertex3f(
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std.math.cos(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * (floatI + 1.0))) * std.math.sin(std.math.rad_per_deg * (floatJ * 360 / floatSlices)),
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std.math.sin(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * (floatI + 1.0))),
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std.math.cos(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * (floatI + 1.0))) * std.math.cos(std.math.rad_per_deg * (floatJ * 360 / floatSlices)),
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);
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rlgl.rlVertex3f(
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std.math.cos(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * floatI)) * std.math.sin(std.math.rad_per_deg * (floatJ * 360 / floatSlices)),
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std.math.sin(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * floatI)),
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std.math.cos(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * floatI)) * std.math.cos(std.math.rad_per_deg * (floatJ * 360 / floatSlices)),
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);
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rlgl.rlVertex3f(
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std.math.cos(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * (floatI))) * std.math.sin(std.math.rad_per_deg * ((floatJ + 1.0) * 360 / floatSlices)),
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std.math.sin(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * (floatI))),
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std.math.cos(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * (floatI))) * std.math.cos(std.math.rad_per_deg * ((floatJ + 1.0) * 360 / floatSlices)),
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);
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rlgl.rlVertex3f(
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std.math.cos(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * (floatI + 1.0))) * std.math.sin(std.math.rad_per_deg * ((floatJ + 1.0) * 360 / floatSlices)),
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std.math.sin(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * (floatI + 1.0))),
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std.math.cos(std.math.rad_per_deg * (270.0 + (180.0 / (floatRings + 1.0)) * (floatI + 1.0))) * std.math.cos(std.math.rad_per_deg * ((floatJ + 1.0) * 360 / floatSlices)),
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);
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}
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}
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rlgl.rlEnd();
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}
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