diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/main.odin | 109 |
1 files changed, 102 insertions, 7 deletions
diff --git a/src/main.odin b/src/main.odin index aa45ba0..ce8ac19 100644 --- a/src/main.odin +++ b/src/main.odin @@ -7,6 +7,7 @@ import "base:intrinsics" import "base:runtime" import "core:c/libc" import "core:fmt" +import "core:math" import "core:math/linalg" import "core:os" @@ -15,14 +16,102 @@ import "shader" GL_MAJOR_VERSION :: 3 GL_MINOR_VERSION :: 3 +Vec3 :: linalg.Vector3f32 + +camera_pos := Vec3{0.0, 0.0, 3.0} +camera_front := Vec3{0.0, 0.0, -1.0} +camera_up := Vec3{0.0, 1.0, 0.0} + +delta_time: f32 = 0.0 +last_frame: f32 = 0.0 + +SCREEN_WIDTH: f32 : 800.0 +SCREEN_HEIGTH: f32 : 600.0 + +first_mouse := true +yaw: f32 = -90.0 +pitch: f32 = 0.0 +last_x: f32 = 800.0 / 2.0 +last_y: f32 = 800.0 / 2.0 +fov: f32 = 45.0 + framebuffer_size_callback :: proc "cdecl" (window: glfw.WindowHandle, width, height: i32) { gl.Viewport(0, 0, width, height) } +mouse_callback :: proc "cdecl" (window: glfw.WindowHandle, xpos_in, ypos_in: f64) { + xpos: f32 = f32(xpos_in) + ypos: f32 = f32(ypos_in) + + if first_mouse { + last_x = xpos + last_y = ypos + first_mouse = false + } + + xoffset: f32 = xpos - last_x + yoffset: f32 = last_y - ypos + last_x = xpos + last_y = ypos + + sensitivity: f32 = 0.1 + + xoffset *= sensitivity + yoffset *= sensitivity + + yaw += xoffset + pitch += yoffset + + if pitch > 89.0 { + pitch = 89.0 + } + if pitch < -89.0 { + pitch = -89.0 + } + + front_x: f32 = math.cos(linalg.to_radians(yaw)) * math.cos(linalg.to_radians(pitch)) + front_y: f32 = math.sin(linalg.to_radians(pitch)) + front_z: f32 = math.sin(linalg.to_radians(yaw)) * math.cos(linalg.to_radians(pitch)) + + camera_front = linalg.vector_normalize(Vec3{front_x, front_y, front_z}) +} + +mouse_scroll_callback :: proc "cdecl" (window: glfw.WindowHandle, xoffset, yoffset: f64) { + fov -= f32(yoffset) + + if fov < 1.0 { + fov = 1.0 + } + if fov > 45.0 { + fov = 45.0 + } +} + process_input :: proc(window: ^glfw.WindowHandle) { if glfw.GetKey(window^, glfw.KEY_ESCAPE) == glfw.PRESS { glfw.SetWindowShouldClose(window^, true) } + + camera_speed: f32 = 2.5 * delta_time + + if glfw.GetKey(window^, glfw.KEY_W) == glfw.PRESS { + camera_pos += camera_speed * camera_front + } + + if glfw.GetKey(window^, glfw.KEY_S) == glfw.PRESS { + camera_pos -= camera_speed * camera_front + } + + if glfw.GetKey(window^, glfw.KEY_A) == glfw.PRESS { + cross_a := linalg.vector_cross3(camera_front, camera_up) + camera_pos -= linalg.vector_normalize(cross_a) * camera_speed + + } + + if glfw.GetKey(window^, glfw.KEY_D) == glfw.PRESS { + cross_d := linalg.vector_cross3(camera_front, camera_up) + camera_pos += linalg.vector_normalize(cross_d) * camera_speed + } } @@ -54,6 +143,10 @@ main :: proc() { gl.Viewport(0, 0, 800, 600) glfw.SetFramebufferSizeCallback(window, framebuffer_size_callback) + glfw.SetCursorPosCallback(window, mouse_callback) + glfw.SetScrollCallback(window, mouse_scroll_callback) + glfw.SetInputMode(window, glfw.CURSOR, glfw.CURSOR_DISABLED) + shdr, err := shader.shader_init("res/shaders/triangle.vs", "res/shaders/triangle.fs") if err == shader.SHADER_LOAD_ERROR { fmt.eprintln("Could not initialize shader") @@ -349,6 +442,10 @@ main :: proc() { } for !glfw.WindowShouldClose(window) { + current_frame: f32 = f32(glfw.GetTime()) + delta_time = current_frame - last_frame + last_frame = current_frame + process_input(&window) gl.ClearColor(0.2, 0.3, 0.3, 1.0) @@ -361,13 +458,11 @@ main :: proc() { aspect: f32 = 800.0 / 600.0 - view := linalg.matrix4_translate(linalg.Vector3f32{0.0, 0.0, -3.0}) - projection := linalg.matrix4_perspective_f32( - f32(linalg.to_radians(45.0)), - aspect, - 0.1, - 100.0, - ) + + view := linalg.matrix4_look_at(camera_pos, camera_pos + camera_front, camera_up) + + + projection := linalg.matrix4_perspective_f32(linalg.to_radians(fov), aspect, 0.1, 100.0) view_location := gl.GetUniformLocation(shdr.id, "view") gl.UniformMatrix4fv(view_location, 1, gl.FALSE, &view[0][0]) |