40 lines
No EOL
1.3 KiB
C
40 lines
No EOL
1.3 KiB
C
bool almost_equals(float a, float b, float epsilon) {
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return fabs(a - b) <= epsilon;
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}
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bool animate_to_target_f32(float* value, float target, float delta_time, float rate) {
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*value += (target - *value) * (1.0 - pow(2.0f, -rate * delta_time));
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if (almost_equals(*value, target, 0.001f)) {
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*value = target;
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return true; // finished animation
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}
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return false;
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}
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bool animate_to_target_v2(Vector2* value, Vector2 target, float delta_time, float rate) {
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bool result_x = animate_to_target_f32(&(value->x), target.x, delta_time, rate);
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bool result_y = animate_to_target_f32(&(value->y), target.y, delta_time, rate);
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return result_x && result_y;
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}
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Vector2 screen_to_world(Vector2 screen) {
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Matrix4 proj = draw_frame.projection;
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Matrix4 view = draw_frame.camera_xform;
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float window_w = window.width;
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float window_h = window.height;
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// Normalize the mouse coordinates
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float ndc_x = (screen.x / (window_w * 0.5f)) - 1.0f;
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float ndc_y = (screen.y / (window_h * 0.5f)) - 1.0f;
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// Transform to world coordinates
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Vector4 world_pos = v4(ndc_x, ndc_y, 0, 1);
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world_pos = m4_transform(m4_inverse(proj), world_pos);
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world_pos = m4_transform(view, world_pos);
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return world_pos.xy;
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}
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Vector2 mouse_world_pos() {
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return screen_to_world(v2(input_frame.mouse_x, input_frame.mouse_y));
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} |